/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/ps4-ll_valuebound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 04:45:47,286 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 04:45:47,287 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 04:45:47,318 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 04:45:47,332 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 04:45:47,333 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 04:45:47,334 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 04:45:47,335 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 04:45:47,337 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 04:45:47,338 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 04:45:47,339 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 04:45:47,343 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 04:45:47,343 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 04:45:47,344 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 04:45:47,345 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 04:45:47,346 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 04:45:47,350 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 04:45:47,357 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 04:45:47,357 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 04:45:47,358 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 04:45:47,358 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-06 04:45:47,386 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 04:45:47,386 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 04:45:47,388 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 04:45:47,388 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 04:45:47,388 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 04:45:47,388 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 04:45:47,388 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 04:45:47,388 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 04:45:47,388 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 04:45:47,388 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 04:45:47,389 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 04:45:47,389 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 04:45:47,389 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 04:45:47,389 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 04:45:47,389 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 04:45:47,389 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 04:45:47,389 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 04:45:47,390 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 04:45:47,390 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 04:45:47,390 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 04:45:47,390 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 04:45:47,390 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 04:45:47,390 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 04:45:47,390 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 04:45:47,390 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 04:45:47,390 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 04:45:47,391 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 04:45:47,391 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 04:45:47,391 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 04:45:47,628 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 04:45:47,645 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 04:45:47,647 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 04:45:47,648 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 04:45:47,648 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 04:45:47,649 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_valuebound50.c [2021-05-06 04:45:47,696 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ffef9272c/a4bb86af0d6740f7961372630ddd8fd9/FLAG6e5f5965d [2021-05-06 04:45:48,102 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 04:45:48,103 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_valuebound50.c [2021-05-06 04:45:48,108 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ffef9272c/a4bb86af0d6740f7961372630ddd8fd9/FLAG6e5f5965d [2021-05-06 04:45:48,129 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ffef9272c/a4bb86af0d6740f7961372630ddd8fd9 [2021-05-06 04:45:48,137 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 04:45:48,139 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 04:45:48,139 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 04:45:48,140 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 04:45:48,142 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 04:45:48,142 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:45:48" (1/1) ... [2021-05-06 04:45:48,143 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@777126b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48, skipping insertion in model container [2021-05-06 04:45:48,143 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:45:48" (1/1) ... [2021-05-06 04:45:48,160 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 04:45:48,175 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 04:45:48,338 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/ps4-ll_valuebound50.c[458,471] [2021-05-06 04:45:48,351 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:45:48,356 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 04:45:48,396 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/ps4-ll_valuebound50.c[458,471] [2021-05-06 04:45:48,409 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:45:48,419 INFO L208 MainTranslator]: Completed translation [2021-05-06 04:45:48,420 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48 WrapperNode [2021-05-06 04:45:48,420 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 04:45:48,421 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 04:45:48,421 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 04:45:48,422 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 04:45:48,429 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48" (1/1) ... [2021-05-06 04:45:48,429 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48" (1/1) ... [2021-05-06 04:45:48,434 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48" (1/1) ... [2021-05-06 04:45:48,435 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48" (1/1) ... [2021-05-06 04:45:48,443 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48" (1/1) ... [2021-05-06 04:45:48,446 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48" (1/1) ... [2021-05-06 04:45:48,447 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48" (1/1) ... [2021-05-06 04:45:48,451 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 04:45:48,452 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 04:45:48,452 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 04:45:48,452 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 04:45:48,452 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 04:45:48,547 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 04:45:48,548 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 04:45:48,548 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 04:45:48,548 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 04:45:48,548 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 04:45:48,548 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 04:45:48,548 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 04:45:48,548 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 04:45:48,549 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 04:45:48,549 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 04:45:48,549 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-06 04:45:48,549 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 04:45:48,549 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 04:45:48,549 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 04:45:48,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 04:45:48,550 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 04:45:48,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 04:45:48,550 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 04:45:48,550 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 04:45:48,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 04:45:48,783 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 04:45:48,783 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 04:45:48,784 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:45:48 BoogieIcfgContainer [2021-05-06 04:45:48,784 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 04:45:48,785 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 04:45:48,785 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 04:45:48,787 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 04:45:48,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 04:45:48" (1/3) ... [2021-05-06 04:45:48,787 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46e61c10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:45:48, skipping insertion in model container [2021-05-06 04:45:48,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:45:48" (2/3) ... [2021-05-06 04:45:48,788 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46e61c10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:45:48, skipping insertion in model container [2021-05-06 04:45:48,788 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:45:48" (3/3) ... [2021-05-06 04:45:48,788 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll_valuebound50.c [2021-05-06 04:45:48,792 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 04:45:48,794 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 04:45:48,818 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 04:45:48,832 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 04:45:48,834 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 04:45:48,834 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 04:45:48,834 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 04:45:48,834 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 04:45:48,834 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 04:45:48,835 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 04:45:48,835 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 04:45:48,859 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 04:45:48,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 04:45:48,862 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:48,862 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:48,863 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:48,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:48,866 INFO L82 PathProgramCache]: Analyzing trace with hash -630235283, now seen corresponding path program 1 times [2021-05-06 04:45:48,871 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:48,871 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341598250] [2021-05-06 04:45:48,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:48,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:45:49,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 04:45:49,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:45:49,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 04:45:49,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:45:49,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:45:49,109 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:49,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341598250] [2021-05-06 04:45:49,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341598250] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:45:49,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:45:49,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 04:45:49,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866527108] [2021-05-06 04:45:49,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 04:45:49,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:49,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 04:45:49,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:45:49,125 INFO L87 Difference]: Start difference. First operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 04:45:49,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:49,221 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-05-06 04:45:49,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 04:45:49,223 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-06 04:45:49,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:49,228 INFO L225 Difference]: With dead ends: 47 [2021-05-06 04:45:49,228 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 04:45:49,230 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 54.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:45:49,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 04:45:49,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 04:45:49,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:45:49,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-05-06 04:45:49,262 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2021-05-06 04:45:49,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:49,262 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-05-06 04:45:49,262 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 04:45:49,262 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-05-06 04:45:49,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 04:45:49,264 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:49,264 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:49,264 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 04:45:49,264 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:49,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:49,265 INFO L82 PathProgramCache]: Analyzing trace with hash 51610547, now seen corresponding path program 1 times [2021-05-06 04:45:49,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:49,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835125993] [2021-05-06 04:45:49,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:49,290 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:49,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1237442681] [2021-05-06 04:45:49,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:49,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:45:49,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 04:45:49,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:49,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:49,487 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:45:49,487 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:49,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835125993] [2021-05-06 04:45:49,488 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:49,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237442681] [2021-05-06 04:45:49,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1237442681] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:45:49,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:45:49,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 04:45:49,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527793001] [2021-05-06 04:45:49,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:45:49,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:49,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:45:49,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:45:49,490 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 04:45:49,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:49,537 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-06 04:45:49,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 04:45:49,537 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-06 04:45:49,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:49,538 INFO L225 Difference]: With dead ends: 34 [2021-05-06 04:45:49,538 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 04:45:49,539 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.6ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:45:49,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 04:45:49,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-06 04:45:49,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 04:45:49,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-06 04:45:49,546 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 17 [2021-05-06 04:45:49,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:49,546 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-06 04:45:49,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 04:45:49,546 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-06 04:45:49,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 04:45:49,547 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:49,547 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:49,772 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 04:45:49,773 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:49,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:49,774 INFO L82 PathProgramCache]: Analyzing trace with hash 311787922, now seen corresponding path program 1 times [2021-05-06 04:45:49,774 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:49,774 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080865929] [2021-05-06 04:45:49,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:49,781 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:49,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1875819827] [2021-05-06 04:45:49,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:49,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:45:49,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 04:45:49,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:49,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:49,998 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:45:49,998 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:49,998 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080865929] [2021-05-06 04:45:49,998 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:49,998 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875819827] [2021-05-06 04:45:49,998 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1875819827] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:49,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:49,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 04:45:49,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652295549] [2021-05-06 04:45:49,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 04:45:49,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:49,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 04:45:50,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:45:50,000 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:45:50,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:50,054 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2021-05-06 04:45:50,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 04:45:50,055 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-06 04:45:50,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:50,055 INFO L225 Difference]: With dead ends: 41 [2021-05-06 04:45:50,055 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 04:45:50,056 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.8ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 04:45:50,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 04:45:50,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-06 04:45:50,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 25 states have internal predecessors, (26), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 04:45:50,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2021-05-06 04:45:50,062 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 24 [2021-05-06 04:45:50,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:50,063 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2021-05-06 04:45:50,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:45:50,063 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2021-05-06 04:45:50,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 04:45:50,063 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:50,063 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:50,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:50,277 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:50,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:50,277 INFO L82 PathProgramCache]: Analyzing trace with hash -1417466424, now seen corresponding path program 1 times [2021-05-06 04:45:50,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:50,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341113082] [2021-05-06 04:45:50,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:50,287 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:50,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1289253626] [2021-05-06 04:45:50,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:50,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:45:50,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 04:45:50,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:50,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:50,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:50,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:50,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:50,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:50,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:50,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:50,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:50,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:50,450 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 04:45:50,450 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:50,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341113082] [2021-05-06 04:45:50,450 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:50,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289253626] [2021-05-06 04:45:50,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289253626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:50,451 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:50,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 04:45:50,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24479237] [2021-05-06 04:45:50,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 04:45:50,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:50,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 04:45:50,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 04:45:50,452 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 04:45:50,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:50,512 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2021-05-06 04:45:50,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 04:45:50,513 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 30 [2021-05-06 04:45:50,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:50,514 INFO L225 Difference]: With dead ends: 44 [2021-05-06 04:45:50,514 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 04:45:50,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 38.0ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 04:45:50,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 04:45:50,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-06 04:45:50,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 04:45:50,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-05-06 04:45:50,520 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 30 [2021-05-06 04:45:50,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:50,520 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-05-06 04:45:50,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 04:45:50,520 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-05-06 04:45:50,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 04:45:50,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:50,521 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:50,737 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:50,737 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:50,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:50,737 INFO L82 PathProgramCache]: Analyzing trace with hash -965543213, now seen corresponding path program 2 times [2021-05-06 04:45:50,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:50,738 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236798124] [2021-05-06 04:45:50,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:50,747 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:50,747 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2029624430] [2021-05-06 04:45:50,747 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:50,809 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:45:50,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:50,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 04:45:50,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:50,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:50,930 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 04:45:50,931 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:50,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236798124] [2021-05-06 04:45:50,931 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:50,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2029624430] [2021-05-06 04:45:50,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2029624430] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:50,931 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:50,931 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 04:45:50,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60872466] [2021-05-06 04:45:50,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 04:45:50,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:50,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 04:45:50,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 04:45:50,938 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 04:45:51,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:51,029 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2021-05-06 04:45:51,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 04:45:51,030 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-05-06 04:45:51,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:51,031 INFO L225 Difference]: With dead ends: 48 [2021-05-06 04:45:51,031 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 04:45:51,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.6ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 04:45:51,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 04:45:51,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-06 04:45:51,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 30 states have internal predecessors, (31), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 04:45:51,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-05-06 04:45:51,037 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 31 [2021-05-06 04:45:51,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:51,037 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-05-06 04:45:51,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 04:45:51,038 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-05-06 04:45:51,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 04:45:51,038 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:51,038 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:51,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:51,253 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:51,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:51,253 INFO L82 PathProgramCache]: Analyzing trace with hash -2045316535, now seen corresponding path program 2 times [2021-05-06 04:45:51,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:51,254 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333443297] [2021-05-06 04:45:51,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:51,260 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:51,260 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [256434834] [2021-05-06 04:45:51,261 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:51,306 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:45:51,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:51,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 04:45:51,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:51,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,430 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 04:45:51,430 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:51,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333443297] [2021-05-06 04:45:51,431 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:51,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256434834] [2021-05-06 04:45:51,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256434834] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:51,431 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:51,431 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 04:45:51,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259525287] [2021-05-06 04:45:51,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 04:45:51,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:51,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 04:45:51,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-06 04:45:51,432 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 04:45:51,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:51,497 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2021-05-06 04:45:51,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 04:45:51,497 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 37 [2021-05-06 04:45:51,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:51,500 INFO L225 Difference]: With dead ends: 51 [2021-05-06 04:45:51,500 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 04:45:51,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 45.3ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-06 04:45:51,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 04:45:51,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-06 04:45:51,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 04:45:51,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-05-06 04:45:51,514 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 37 [2021-05-06 04:45:51,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:51,515 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-05-06 04:45:51,515 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 04:45:51,515 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-05-06 04:45:51,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 04:45:51,515 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:51,516 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:51,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-06 04:45:51,725 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:51,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:51,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1045939826, now seen corresponding path program 3 times [2021-05-06 04:45:51,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:51,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85008219] [2021-05-06 04:45:51,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:51,731 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:51,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [18367808] [2021-05-06 04:45:51,731 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:51,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 04:45:51,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:51,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 04:45:51,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:51,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:51,931 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-06 04:45:51,932 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:51,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85008219] [2021-05-06 04:45:51,932 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:51,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18367808] [2021-05-06 04:45:51,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18367808] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:51,932 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:51,932 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 04:45:51,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847625635] [2021-05-06 04:45:51,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 04:45:51,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:51,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 04:45:51,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 04:45:51,933 INFO L87 Difference]: Start difference. First operand 44 states and 46 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 04:45:51,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:51,985 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2021-05-06 04:45:51,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 04:45:51,986 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 38 [2021-05-06 04:45:51,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:51,987 INFO L225 Difference]: With dead ends: 50 [2021-05-06 04:45:51,987 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 04:45:51,988 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 79.8ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 04:45:51,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 04:45:52,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-06 04:45:52,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 04:45:52,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2021-05-06 04:45:52,005 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 38 [2021-05-06 04:45:52,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:52,005 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2021-05-06 04:45:52,005 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 04:45:52,005 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2021-05-06 04:45:52,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 04:45:52,006 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:52,006 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:52,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:52,207 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:52,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:52,207 INFO L82 PathProgramCache]: Analyzing trace with hash -285848920, now seen corresponding path program 3 times [2021-05-06 04:45:52,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:52,208 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425767764] [2021-05-06 04:45:52,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:52,213 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:52,213 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [537460041] [2021-05-06 04:45:52,213 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 [2021-05-06 04:45:52,297 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 04:45:52,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:52,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-06 04:45:52,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:52,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,427 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-06 04:45:52,427 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:52,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1425767764] [2021-05-06 04:45:52,427 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:52,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537460041] [2021-05-06 04:45:52,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537460041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:52,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:52,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 04:45:52,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088181014] [2021-05-06 04:45:52,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 04:45:52,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:52,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 04:45:52,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-06 04:45:52,428 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-06 04:45:52,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:52,493 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2021-05-06 04:45:52,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 04:45:52,493 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 44 [2021-05-06 04:45:52,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:52,495 INFO L225 Difference]: With dead ends: 53 [2021-05-06 04:45:52,495 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 04:45:52,495 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 47.7ms TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-06 04:45:52,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 04:45:52,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-06 04:45:52,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 04:45:52,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-05-06 04:45:52,501 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2021-05-06 04:45:52,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:52,503 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-05-06 04:45:52,503 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-06 04:45:52,503 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-05-06 04:45:52,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 04:45:52,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:52,505 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:52,727 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 04:45:52,727 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:52,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:52,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1858889367, now seen corresponding path program 4 times [2021-05-06 04:45:52,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:52,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81580556] [2021-05-06 04:45:52,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:52,733 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:52,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [156187686] [2021-05-06 04:45:52,733 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 [2021-05-06 04:45:52,779 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 04:45:52,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:52,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 04:45:52,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:52,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:52,910 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 04:45:52,910 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:52,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81580556] [2021-05-06 04:45:52,910 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:52,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156187686] [2021-05-06 04:45:52,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [156187686] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:52,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:52,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 04:45:52,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497109598] [2021-05-06 04:45:52,911 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 04:45:52,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:52,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 04:45:52,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-06 04:45:52,911 INFO L87 Difference]: Start difference. First operand 48 states and 49 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-06 04:45:53,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:53,002 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2021-05-06 04:45:53,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 04:45:53,002 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 51 [2021-05-06 04:45:53,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:53,004 INFO L225 Difference]: With dead ends: 56 [2021-05-06 04:45:53,004 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 04:45:53,004 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 57.2ms TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-06 04:45:53,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 04:45:53,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-06 04:45:53,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 04:45:53,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-06 04:45:53,015 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 51 [2021-05-06 04:45:53,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:53,015 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-06 04:45:53,015 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-06 04:45:53,015 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-06 04:45:53,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 04:45:53,017 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:53,017 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:53,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-06 04:45:53,229 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:53,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:53,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1288003464, now seen corresponding path program 5 times [2021-05-06 04:45:53,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:53,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730469074] [2021-05-06 04:45:53,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:53,235 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:53,235 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [28329912] [2021-05-06 04:45:53,235 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 [2021-05-06 04:45:53,327 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-06 04:45:53,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:53,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-06 04:45:53,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:53,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:53,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:53,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:53,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:53,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:53,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:53,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:53,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:53,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:53,479 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-06 04:45:53,479 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:53,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730469074] [2021-05-06 04:45:53,479 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:53,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28329912] [2021-05-06 04:45:53,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28329912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:53,479 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:53,480 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 04:45:53,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208968203] [2021-05-06 04:45:53,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 04:45:53,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:53,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 04:45:53,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-05-06 04:45:53,480 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 8 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-06 04:45:53,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:53,571 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2021-05-06 04:45:53,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 04:45:53,572 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 8 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 58 [2021-05-06 04:45:53,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:53,572 INFO L225 Difference]: With dead ends: 59 [2021-05-06 04:45:53,572 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 04:45:53,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 62.6ms TimeCoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-05-06 04:45:53,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 04:45:53,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-06 04:45:53,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 11 states have call successors, (11), 8 states have call predecessors, (11), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 04:45:53,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2021-05-06 04:45:53,578 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 58 [2021-05-06 04:45:53,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:53,578 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2021-05-06 04:45:53,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 8 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-06 04:45:53,578 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2021-05-06 04:45:53,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 04:45:53,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:53,579 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:53,795 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:53,795 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:53,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:53,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1494042761, now seen corresponding path program 6 times [2021-05-06 04:45:53,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:53,796 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281736746] [2021-05-06 04:45:53,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:53,801 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:53,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [318017298] [2021-05-06 04:45:53,801 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 [2021-05-06 04:45:53,907 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-06 04:45:53,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:53,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-06 04:45:53,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:54,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,081 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 63 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-05-06 04:45:54,081 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:54,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281736746] [2021-05-06 04:45:54,081 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:54,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318017298] [2021-05-06 04:45:54,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318017298] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:54,081 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:54,081 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-06 04:45:54,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884477321] [2021-05-06 04:45:54,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 04:45:54,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:54,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 04:45:54,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-05-06 04:45:54,082 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-05-06 04:45:54,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:54,194 INFO L93 Difference]: Finished difference Result 62 states and 66 transitions. [2021-05-06 04:45:54,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 04:45:54,195 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 65 [2021-05-06 04:45:54,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:54,195 INFO L225 Difference]: With dead ends: 62 [2021-05-06 04:45:54,195 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 04:45:54,196 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 82.3ms TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-05-06 04:45:54,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 04:45:54,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-05-06 04:45:54,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 12 states have call successors, (12), 8 states have call predecessors, (12), 6 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 04:45:54,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2021-05-06 04:45:54,200 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 65 [2021-05-06 04:45:54,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:54,201 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2021-05-06 04:45:54,201 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-05-06 04:45:54,201 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2021-05-06 04:45:54,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 04:45:54,201 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:54,201 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:54,418 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 04:45:54,419 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:54,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:54,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1734448024, now seen corresponding path program 7 times [2021-05-06 04:45:54,419 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:54,419 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173621089] [2021-05-06 04:45:54,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:54,434 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:54,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1015521265] [2021-05-06 04:45:54,434 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 [2021-05-06 04:45:54,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:45:54,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-06 04:45:54,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:54,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:54,823 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 04:45:54,823 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:54,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173621089] [2021-05-06 04:45:54,823 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:54,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015521265] [2021-05-06 04:45:54,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015521265] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:54,823 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:54,823 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 04:45:54,823 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307563951] [2021-05-06 04:45:54,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 04:45:54,824 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:54,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 04:45:54,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-05-06 04:45:54,825 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 10 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-05-06 04:45:54,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:54,990 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2021-05-06 04:45:54,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 04:45:54,991 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 10 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 72 [2021-05-06 04:45:54,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:54,991 INFO L225 Difference]: With dead ends: 65 [2021-05-06 04:45:54,991 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 04:45:54,991 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 86.8ms TimeCoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-06 04:45:54,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 04:45:55,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-06 04:45:55,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 13 states have call successors, (13), 8 states have call predecessors, (13), 6 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 04:45:55,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2021-05-06 04:45:55,014 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 72 [2021-05-06 04:45:55,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:55,014 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2021-05-06 04:45:55,014 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 10 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-05-06 04:45:55,015 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2021-05-06 04:45:55,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 04:45:55,015 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:55,015 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:55,221 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-06 04:45:55,221 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:55,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:55,221 INFO L82 PathProgramCache]: Analyzing trace with hash 708181929, now seen corresponding path program 8 times [2021-05-06 04:45:55,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:55,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110424057] [2021-05-06 04:45:55,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:55,226 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:55,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1021664077] [2021-05-06 04:45:55,226 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 [2021-05-06 04:45:55,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:45:55,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:55,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-06 04:45:55,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:55,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:55,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:55,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:55,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:55,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:55,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:55,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:55,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:55,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:55,903 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 18 proven. 108 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 04:45:55,904 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:55,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110424057] [2021-05-06 04:45:55,904 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:55,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021664077] [2021-05-06 04:45:55,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021664077] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:55,904 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:55,904 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-06 04:45:55,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942166862] [2021-05-06 04:45:55,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 04:45:55,905 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:55,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 04:45:55,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2021-05-06 04:45:55,905 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 11 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-05-06 04:45:56,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:56,063 INFO L93 Difference]: Finished difference Result 68 states and 74 transitions. [2021-05-06 04:45:56,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 04:45:56,064 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 11 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 79 [2021-05-06 04:45:56,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:56,064 INFO L225 Difference]: With dead ends: 68 [2021-05-06 04:45:56,065 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 04:45:56,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 101.2ms TimeCoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-05-06 04:45:56,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 04:45:56,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-06 04:45:56,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 14 states have call successors, (14), 8 states have call predecessors, (14), 6 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 04:45:56,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 69 transitions. [2021-05-06 04:45:56,070 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 69 transitions. Word has length 79 [2021-05-06 04:45:56,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:56,070 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 69 transitions. [2021-05-06 04:45:56,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 11 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-05-06 04:45:56,070 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 69 transitions. [2021-05-06 04:45:56,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 04:45:56,070 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:56,070 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:56,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:56,276 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:56,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:56,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1649446584, now seen corresponding path program 9 times [2021-05-06 04:45:56,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:56,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045519914] [2021-05-06 04:45:56,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:56,281 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:56,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1891774450] [2021-05-06 04:45:56,281 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 [2021-05-06 04:45:56,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-06 04:45:56,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:56,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-06 04:45:56,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:57,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:57,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:57,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:57,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:57,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:57,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:57,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:57,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:57,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:57,088 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-06 04:45:57,088 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:57,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045519914] [2021-05-06 04:45:57,088 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:57,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1891774450] [2021-05-06 04:45:57,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1891774450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:57,089 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:57,089 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-06 04:45:57,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24992089] [2021-05-06 04:45:57,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 04:45:57,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:57,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 04:45:57,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-05-06 04:45:57,090 INFO L87 Difference]: Start difference. First operand 63 states and 69 transitions. Second operand has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 12 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-06 04:45:57,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:57,326 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2021-05-06 04:45:57,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 04:45:57,326 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 12 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 86 [2021-05-06 04:45:57,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:57,327 INFO L225 Difference]: With dead ends: 71 [2021-05-06 04:45:57,327 INFO L226 Difference]: Without dead ends: 66 [2021-05-06 04:45:57,328 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 181.2ms TimeCoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2021-05-06 04:45:57,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-06 04:45:57,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-05-06 04:45:57,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 15 states have call successors, (15), 8 states have call predecessors, (15), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 04:45:57,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 73 transitions. [2021-05-06 04:45:57,336 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 73 transitions. Word has length 86 [2021-05-06 04:45:57,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:57,337 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 73 transitions. [2021-05-06 04:45:57,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 12 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-06 04:45:57,337 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 73 transitions. [2021-05-06 04:45:57,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 04:45:57,337 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:57,337 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:57,538 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 04:45:57,538 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:57,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:57,538 INFO L82 PathProgramCache]: Analyzing trace with hash -373309751, now seen corresponding path program 10 times [2021-05-06 04:45:57,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:57,538 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151935171] [2021-05-06 04:45:57,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:57,543 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:57,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [897073743] [2021-05-06 04:45:57,543 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 [2021-05-06 04:45:58,334 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 04:45:58,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:58,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-06 04:45:58,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:58,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:58,770 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 22 proven. 165 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-05-06 04:45:58,771 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:58,771 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151935171] [2021-05-06 04:45:58,771 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:58,771 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [897073743] [2021-05-06 04:45:58,771 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [897073743] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:58,771 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:58,771 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-06 04:45:58,771 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958443645] [2021-05-06 04:45:58,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 04:45:58,772 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:58,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 04:45:58,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2021-05-06 04:45:58,772 INFO L87 Difference]: Start difference. First operand 66 states and 73 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, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2021-05-06 04:45:58,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:45:58,979 INFO L93 Difference]: Finished difference Result 74 states and 82 transitions. [2021-05-06 04:45:58,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 04:45:58,979 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, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) Word has length 93 [2021-05-06 04:45:58,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:45:58,980 INFO L225 Difference]: With dead ends: 74 [2021-05-06 04:45:58,980 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 04:45:58,980 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 150.0ms TimeCoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-05-06 04:45:58,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 04:45:58,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-06 04:45:58,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 16 states have call successors, (16), 8 states have call predecessors, (16), 6 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 04:45:58,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 77 transitions. [2021-05-06 04:45:58,985 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 77 transitions. Word has length 93 [2021-05-06 04:45:58,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:45:58,985 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 77 transitions. [2021-05-06 04:45:58,985 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, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2021-05-06 04:45:58,985 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 77 transitions. [2021-05-06 04:45:58,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-06 04:45:58,986 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:45:58,986 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:45:59,186 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:45:59,186 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:45:59,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:45:59,187 INFO L82 PathProgramCache]: Analyzing trace with hash -22647256, now seen corresponding path program 11 times [2021-05-06 04:45:59,187 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:45:59,187 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738094964] [2021-05-06 04:45:59,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:45:59,191 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:45:59,191 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1840873245] [2021-05-06 04:45:59,191 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 [2021-05-06 04:45:59,520 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-06 04:45:59,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:45:59,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-06 04:45:59,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:45:59,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:59,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:59,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:59,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:59,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:59,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:59,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:59,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:59,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:45:59,775 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 24 proven. 198 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-05-06 04:45:59,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:45:59,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738094964] [2021-05-06 04:45:59,775 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:45:59,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840873245] [2021-05-06 04:45:59,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840873245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:45:59,775 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:45:59,775 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-06 04:45:59,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821511460] [2021-05-06 04:45:59,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 04:45:59,776 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:45:59,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 04:45:59,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2021-05-06 04:45:59,776 INFO L87 Difference]: Start difference. First operand 69 states and 77 transitions. Second operand has 17 states, 16 states have (on average 2.3125) internal successors, (37), 16 states have internal predecessors, (37), 14 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2021-05-06 04:46:00,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:46:00,024 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2021-05-06 04:46:00,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 04:46:00,024 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 16 states have internal predecessors, (37), 14 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) Word has length 100 [2021-05-06 04:46:00,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:46:00,025 INFO L225 Difference]: With dead ends: 77 [2021-05-06 04:46:00,025 INFO L226 Difference]: Without dead ends: 72 [2021-05-06 04:46:00,025 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 144.5ms TimeCoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2021-05-06 04:46:00,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-06 04:46:00,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-05-06 04:46:00,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 states have internal predecessors, (49), 17 states have call successors, (17), 8 states have call predecessors, (17), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 04:46:00,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 81 transitions. [2021-05-06 04:46:00,031 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 81 transitions. Word has length 100 [2021-05-06 04:46:00,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:46:00,031 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 81 transitions. [2021-05-06 04:46:00,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 16 states have internal predecessors, (37), 14 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2021-05-06 04:46:00,031 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 81 transitions. [2021-05-06 04:46:00,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 04:46:00,032 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:46:00,032 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:46:00,238 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-06 04:46:00,239 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:46:00,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:46:00,239 INFO L82 PathProgramCache]: Analyzing trace with hash 893158889, now seen corresponding path program 12 times [2021-05-06 04:46:00,239 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:46:00,239 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709977082] [2021-05-06 04:46:00,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:46:00,244 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:46:00,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [217768883] [2021-05-06 04:46:00,244 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:46:00,638 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-06 04:46:00,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:46:00,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-06 04:46:00,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:46:00,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:00,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:00,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:00,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:00,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:00,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:00,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:00,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:00,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:00,905 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 26 proven. 234 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-05-06 04:46:00,905 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:46:00,905 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709977082] [2021-05-06 04:46:00,905 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:46:00,905 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217768883] [2021-05-06 04:46:00,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217768883] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:46:00,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:46:00,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-05-06 04:46:00,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663872271] [2021-05-06 04:46:00,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 04:46:00,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:46:00,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 04:46:00,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2021-05-06 04:46:00,906 INFO L87 Difference]: Start difference. First operand 72 states and 81 transitions. Second operand has 18 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 15 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2021-05-06 04:46:01,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:46:01,168 INFO L93 Difference]: Finished difference Result 80 states and 90 transitions. [2021-05-06 04:46:01,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 04:46:01,168 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 15 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) Word has length 107 [2021-05-06 04:46:01,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:46:01,169 INFO L225 Difference]: With dead ends: 80 [2021-05-06 04:46:01,169 INFO L226 Difference]: Without dead ends: 75 [2021-05-06 04:46:01,169 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 143.9ms TimeCoverageRelationStatistics Valid=41, Invalid=339, Unknown=0, NotChecked=0, Total=380 [2021-05-06 04:46:01,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-06 04:46:01,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-05-06 04:46:01,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 18 states have call successors, (18), 8 states have call predecessors, (18), 6 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 04:46:01,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 85 transitions. [2021-05-06 04:46:01,175 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 85 transitions. Word has length 107 [2021-05-06 04:46:01,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:46:01,176 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 85 transitions. [2021-05-06 04:46:01,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 15 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2021-05-06 04:46:01,177 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 85 transitions. [2021-05-06 04:46:01,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 04:46:01,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:46:01,177 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:46:01,380 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 04:46:01,381 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:46:01,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:46:01,381 INFO L82 PathProgramCache]: Analyzing trace with hash 363946760, now seen corresponding path program 13 times [2021-05-06 04:46:01,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:46:01,381 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208239790] [2021-05-06 04:46:01,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:46:01,385 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:46:01,385 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1261359229] [2021-05-06 04:46:01,386 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:46:01,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:46:01,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-06 04:46:01,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:46:03,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:03,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:03,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:03,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:03,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:03,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:46:03,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:35,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:35,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:35,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:35,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:35,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:35,524 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 98 proven. 275 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2021-05-06 04:58:35,524 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:58:35,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208239790] [2021-05-06 04:58:35,525 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:58:35,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261359229] [2021-05-06 04:58:35,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1261359229] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:58:35,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:58:35,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-05-06 04:58:35,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769150595] [2021-05-06 04:58:35,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 04:58:35,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:58:35,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 04:58:35,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=460, Unknown=0, NotChecked=0, Total=506 [2021-05-06 04:58:35,526 INFO L87 Difference]: Start difference. First operand 75 states and 85 transitions. Second operand has 23 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 16 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2021-05-06 04:58:36,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:58:36,078 INFO L93 Difference]: Finished difference Result 83 states and 94 transitions. [2021-05-06 04:58:36,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 04:58:36,078 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 16 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) Word has length 114 [2021-05-06 04:58:36,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:58:36,079 INFO L225 Difference]: With dead ends: 83 [2021-05-06 04:58:36,079 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 04:58:36,079 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 753496.2ms TimeCoverageRelationStatistics Valid=62, Invalid=588, Unknown=0, NotChecked=0, Total=650 [2021-05-06 04:58:36,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 04:58:36,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-06 04:58:36,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 52 states have (on average 1.0192307692307692) internal successors, (53), 52 states have internal predecessors, (53), 19 states have call successors, (19), 8 states have call predecessors, (19), 6 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 04:58:36,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 89 transitions. [2021-05-06 04:58:36,085 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 89 transitions. Word has length 114 [2021-05-06 04:58:36,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:58:36,086 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 89 transitions. [2021-05-06 04:58:36,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 16 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2021-05-06 04:58:36,086 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 89 transitions. [2021-05-06 04:58:36,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 04:58:36,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:58:36,087 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:58:36,292 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:36,292 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:58:36,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:58:36,293 INFO L82 PathProgramCache]: Analyzing trace with hash -2101455607, now seen corresponding path program 14 times [2021-05-06 04:58:36,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:58:36,293 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099051241] [2021-05-06 04:58:36,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:58:36,297 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:58:36,298 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2120067327] [2021-05-06 04:58:36,298 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:36,760 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:58:36,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:58:36,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-06 04:58:36,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:58:36,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:36,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:37,307 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 30 proven. 315 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-05-06 04:58:37,307 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:58:37,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099051241] [2021-05-06 04:58:37,308 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:58:37,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120067327] [2021-05-06 04:58:37,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2120067327] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:58:37,308 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:58:37,308 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-05-06 04:58:37,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622327187] [2021-05-06 04:58:37,308 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 04:58:37,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:58:37,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 04:58:37,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2021-05-06 04:58:37,309 INFO L87 Difference]: Start difference. First operand 78 states and 89 transitions. Second operand has 20 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 17 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) [2021-05-06 04:58:37,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:58:37,825 INFO L93 Difference]: Finished difference Result 86 states and 98 transitions. [2021-05-06 04:58:37,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 04:58:37,826 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 17 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) Word has length 121 [2021-05-06 04:58:37,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:58:37,826 INFO L225 Difference]: With dead ends: 86 [2021-05-06 04:58:37,827 INFO L226 Difference]: Without dead ends: 81 [2021-05-06 04:58:37,827 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 292.4ms TimeCoverageRelationStatistics Valid=45, Invalid=417, Unknown=0, NotChecked=0, Total=462 [2021-05-06 04:58:37,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-06 04:58:37,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-05-06 04:58:37,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 54 states have (on average 1.0185185185185186) internal successors, (55), 54 states have internal predecessors, (55), 20 states have call successors, (20), 8 states have call predecessors, (20), 6 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 04:58:37,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 93 transitions. [2021-05-06 04:58:37,832 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 93 transitions. Word has length 121 [2021-05-06 04:58:37,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:58:37,833 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 93 transitions. [2021-05-06 04:58:37,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 17 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) [2021-05-06 04:58:37,833 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 93 transitions. [2021-05-06 04:58:37,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-06 04:58:37,834 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:58:37,834 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:58:38,042 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-06 04:58:38,043 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:58:38,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:58:38,043 INFO L82 PathProgramCache]: Analyzing trace with hash -729919512, now seen corresponding path program 15 times [2021-05-06 04:58:38,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:58:38,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110117233] [2021-05-06 04:58:38,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:58:38,058 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:58:38,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2959890] [2021-05-06 04:58:38,058 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:38,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-06 04:58:38,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:58:38,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 68 conjunts are in the unsatisfiable core [2021-05-06 04:58:38,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:58:39,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:39,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:39,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:39,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:39,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:39,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:39,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:39,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:39,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:39,162 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 32 proven. 360 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-05-06 04:58:39,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:58:39,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110117233] [2021-05-06 04:58:39,162 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:58:39,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2959890] [2021-05-06 04:58:39,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2959890] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:58:39,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:58:39,162 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-05-06 04:58:39,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914164902] [2021-05-06 04:58:39,163 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 04:58:39,163 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:58:39,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 04:58:39,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2021-05-06 04:58:39,163 INFO L87 Difference]: Start difference. First operand 81 states and 93 transitions. Second operand has 21 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 18 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) [2021-05-06 04:58:39,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:58:39,717 INFO L93 Difference]: Finished difference Result 89 states and 102 transitions. [2021-05-06 04:58:39,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 04:58:39,717 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 18 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) Word has length 128 [2021-05-06 04:58:39,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:58:39,718 INFO L225 Difference]: With dead ends: 89 [2021-05-06 04:58:39,718 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 04:58:39,718 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 295.8ms TimeCoverageRelationStatistics Valid=47, Invalid=459, Unknown=0, NotChecked=0, Total=506 [2021-05-06 04:58:39,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 04:58:39,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-05-06 04:58:39,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 56 states have (on average 1.0178571428571428) internal successors, (57), 56 states have internal predecessors, (57), 21 states have call successors, (21), 8 states have call predecessors, (21), 6 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-06 04:58:39,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 97 transitions. [2021-05-06 04:58:39,724 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 97 transitions. Word has length 128 [2021-05-06 04:58:39,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:58:39,724 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 97 transitions. [2021-05-06 04:58:39,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 18 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) [2021-05-06 04:58:39,724 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 97 transitions. [2021-05-06 04:58:39,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-06 04:58:39,725 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:58:39,725 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:58:39,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-06 04:58:39,926 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:58:39,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:58:39,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1087843369, now seen corresponding path program 16 times [2021-05-06 04:58:39,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:58:39,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [218585508] [2021-05-06 04:58:39,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:58:39,930 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:58:39,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1281424391] [2021-05-06 04:58:39,931 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:40,443 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 04:58:40,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:58:40,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 72 conjunts are in the unsatisfiable core [2021-05-06 04:58:40,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:58:40,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:40,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:40,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:40,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:40,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:40,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:40,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:40,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:40,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:40,917 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 34 proven. 408 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2021-05-06 04:58:40,918 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:58:40,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [218585508] [2021-05-06 04:58:40,918 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:58:40,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1281424391] [2021-05-06 04:58:40,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1281424391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:58:40,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:58:40,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-05-06 04:58:40,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38239328] [2021-05-06 04:58:40,918 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 04:58:40,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:58:40,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 04:58:40,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2021-05-06 04:58:40,919 INFO L87 Difference]: Start difference. First operand 84 states and 97 transitions. Second operand has 22 states, 21 states have (on average 2.238095238095238) internal successors, (47), 21 states have internal predecessors, (47), 19 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) [2021-05-06 04:58:41,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:58:41,460 INFO L93 Difference]: Finished difference Result 92 states and 106 transitions. [2021-05-06 04:58:41,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 04:58:41,460 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.238095238095238) internal successors, (47), 21 states have internal predecessors, (47), 19 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) Word has length 135 [2021-05-06 04:58:41,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:58:41,461 INFO L225 Difference]: With dead ends: 92 [2021-05-06 04:58:41,461 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 04:58:41,461 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 325.8ms TimeCoverageRelationStatistics Valid=49, Invalid=503, Unknown=0, NotChecked=0, Total=552 [2021-05-06 04:58:41,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 04:58:41,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-06 04:58:41,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 58 states have (on average 1.0172413793103448) internal successors, (59), 58 states have internal predecessors, (59), 22 states have call successors, (22), 8 states have call predecessors, (22), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 04:58:41,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 101 transitions. [2021-05-06 04:58:41,467 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 101 transitions. Word has length 135 [2021-05-06 04:58:41,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:58:41,467 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 101 transitions. [2021-05-06 04:58:41,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 2.238095238095238) internal successors, (47), 21 states have internal predecessors, (47), 19 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) [2021-05-06 04:58:41,467 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 101 transitions. [2021-05-06 04:58:41,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-05-06 04:58:41,467 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:58:41,468 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:58:41,672 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-06 04:58:41,673 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:58:41,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:58:41,673 INFO L82 PathProgramCache]: Analyzing trace with hash -1539623736, now seen corresponding path program 17 times [2021-05-06 04:58:41,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:58:41,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579047693] [2021-05-06 04:58:41,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:58:41,677 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:58:41,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1650274453] [2021-05-06 04:58:41,677 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:45,673 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-05-06 04:58:45,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:58:45,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-06 04:58:45,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:58:46,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:46,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:46,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:46,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:46,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:46,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:46,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:46,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:46,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:46,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 36 proven. 459 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2021-05-06 04:58:46,158 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:58:46,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579047693] [2021-05-06 04:58:46,158 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:58:46,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650274453] [2021-05-06 04:58:46,158 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650274453] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:58:46,158 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:58:46,158 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-05-06 04:58:46,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795556690] [2021-05-06 04:58:46,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 04:58:46,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:58:46,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 04:58:46,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2021-05-06 04:58:46,159 INFO L87 Difference]: Start difference. First operand 87 states and 101 transitions. Second operand has 23 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 20 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2021-05-06 04:58:46,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:58:46,739 INFO L93 Difference]: Finished difference Result 95 states and 110 transitions. [2021-05-06 04:58:46,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 04:58:46,739 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 20 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) Word has length 142 [2021-05-06 04:58:46,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:58:46,740 INFO L225 Difference]: With dead ends: 95 [2021-05-06 04:58:46,740 INFO L226 Difference]: Without dead ends: 90 [2021-05-06 04:58:46,740 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 328.2ms TimeCoverageRelationStatistics Valid=51, Invalid=549, Unknown=0, NotChecked=0, Total=600 [2021-05-06 04:58:46,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-06 04:58:46,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-05-06 04:58:46,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 60 states have (on average 1.0166666666666666) internal successors, (61), 60 states have internal predecessors, (61), 23 states have call successors, (23), 8 states have call predecessors, (23), 6 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 04:58:46,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 105 transitions. [2021-05-06 04:58:46,746 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 105 transitions. Word has length 142 [2021-05-06 04:58:46,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:58:46,746 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 105 transitions. [2021-05-06 04:58:46,747 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 20 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2021-05-06 04:58:46,747 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 105 transitions. [2021-05-06 04:58:46,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-06 04:58:46,747 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:58:46,747 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:58:46,954 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-06 04:58:46,954 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:58:46,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:58:46,955 INFO L82 PathProgramCache]: Analyzing trace with hash -157742263, now seen corresponding path program 18 times [2021-05-06 04:58:46,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:58:46,955 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275699619] [2021-05-06 04:58:46,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:58:46,964 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:58:46,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [70302951] [2021-05-06 04:58:46,965 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:47,572 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-06 04:58:47,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:58:47,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 81 conjunts are in the unsatisfiable core [2021-05-06 04:58:47,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:58:47,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:47,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:48,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:48,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:48,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:48,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:48,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:48,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:48,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:48,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:48,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:48,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 38 proven. 513 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2021-05-06 04:58:48,109 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:58:48,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275699619] [2021-05-06 04:58:48,109 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:58:48,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70302951] [2021-05-06 04:58:48,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70302951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:58:48,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:58:48,109 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-05-06 04:58:48,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630926844] [2021-05-06 04:58:48,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 04:58:48,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:58:48,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 04:58:48,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2021-05-06 04:58:48,110 INFO L87 Difference]: Start difference. First operand 90 states and 105 transitions. Second operand has 24 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 21 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) [2021-05-06 04:58:48,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:58:48,811 INFO L93 Difference]: Finished difference Result 98 states and 114 transitions. [2021-05-06 04:58:48,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 04:58:48,811 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 21 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) Word has length 149 [2021-05-06 04:58:48,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:58:48,812 INFO L225 Difference]: With dead ends: 98 [2021-05-06 04:58:48,812 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 04:58:48,812 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 363.5ms TimeCoverageRelationStatistics Valid=53, Invalid=597, Unknown=0, NotChecked=0, Total=650 [2021-05-06 04:58:48,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 04:58:48,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-06 04:58:48,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 62 states have (on average 1.0161290322580645) internal successors, (63), 62 states have internal predecessors, (63), 24 states have call successors, (24), 8 states have call predecessors, (24), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-06 04:58:48,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 109 transitions. [2021-05-06 04:58:48,818 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 109 transitions. Word has length 149 [2021-05-06 04:58:48,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:58:48,819 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 109 transitions. [2021-05-06 04:58:48,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 21 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) [2021-05-06 04:58:48,819 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 109 transitions. [2021-05-06 04:58:48,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-05-06 04:58:48,819 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:58:48,820 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:58:49,024 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:49,025 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:58:49,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:58:49,025 INFO L82 PathProgramCache]: Analyzing trace with hash 1167462824, now seen corresponding path program 19 times [2021-05-06 04:58:49,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:58:49,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678064313] [2021-05-06 04:58:49,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:58:49,030 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:58:49,030 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1503151193] [2021-05-06 04:58:49,030 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:49,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:58:49,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 84 conjunts are in the unsatisfiable core [2021-05-06 04:58:49,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:58:50,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:50,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:50,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:50,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:50,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:50,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:50,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:50,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:50,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:50,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1370 backedges. 40 proven. 570 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2021-05-06 04:58:50,411 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:58:50,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678064313] [2021-05-06 04:58:50,411 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:58:50,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503151193] [2021-05-06 04:58:50,411 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1503151193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:58:50,411 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:58:50,411 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2021-05-06 04:58:50,411 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377338000] [2021-05-06 04:58:50,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 04:58:50,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:58:50,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 04:58:50,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2021-05-06 04:58:50,412 INFO L87 Difference]: Start difference. First operand 93 states and 109 transitions. Second operand has 25 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 24 states have internal predecessors, (53), 22 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) [2021-05-06 04:58:51,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:58:51,149 INFO L93 Difference]: Finished difference Result 101 states and 118 transitions. [2021-05-06 04:58:51,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 04:58:51,149 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 24 states have internal predecessors, (53), 22 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) Word has length 156 [2021-05-06 04:58:51,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:58:51,150 INFO L225 Difference]: With dead ends: 101 [2021-05-06 04:58:51,150 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 04:58:51,150 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 406.6ms TimeCoverageRelationStatistics Valid=55, Invalid=647, Unknown=0, NotChecked=0, Total=702 [2021-05-06 04:58:51,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 04:58:51,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-05-06 04:58:51,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 64 states have (on average 1.015625) internal successors, (65), 64 states have internal predecessors, (65), 25 states have call successors, (25), 8 states have call predecessors, (25), 6 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-06 04:58:51,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 113 transitions. [2021-05-06 04:58:51,156 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 113 transitions. Word has length 156 [2021-05-06 04:58:51,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:58:51,157 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 113 transitions. [2021-05-06 04:58:51,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 24 states have internal predecessors, (53), 22 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) [2021-05-06 04:58:51,157 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 113 transitions. [2021-05-06 04:58:51,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-05-06 04:58:51,157 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:58:51,158 INFO L523 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:58:51,365 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-05-06 04:58:51,365 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:58:51,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:58:51,366 INFO L82 PathProgramCache]: Analyzing trace with hash 1670771305, now seen corresponding path program 20 times [2021-05-06 04:58:51,366 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:58:51,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191876611] [2021-05-06 04:58:51,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:58:51,373 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:58:51,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [109679227] [2021-05-06 04:58:51,373 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:52,344 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:58:52,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:58:52,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-06 04:58:52,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:58:52,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:52,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:52,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:52,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:52,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:52,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:52,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:52,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:52,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:52,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 42 proven. 630 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2021-05-06 04:58:52,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:58:52,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191876611] [2021-05-06 04:58:52,933 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:58:52,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109679227] [2021-05-06 04:58:52,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109679227] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:58:52,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:58:52,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2021-05-06 04:58:52,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678674158] [2021-05-06 04:58:52,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 04:58:52,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:58:52,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 04:58:52,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2021-05-06 04:58:52,935 INFO L87 Difference]: Start difference. First operand 96 states and 113 transitions. Second operand has 26 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 23 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 22 states have call predecessors, (23), 22 states have call successors, (23) [2021-05-06 04:58:53,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:58:53,699 INFO L93 Difference]: Finished difference Result 104 states and 122 transitions. [2021-05-06 04:58:53,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 04:58:53,700 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 23 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 22 states have call predecessors, (23), 22 states have call successors, (23) Word has length 163 [2021-05-06 04:58:53,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:58:53,700 INFO L225 Difference]: With dead ends: 104 [2021-05-06 04:58:53,700 INFO L226 Difference]: Without dead ends: 99 [2021-05-06 04:58:53,701 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 402.1ms TimeCoverageRelationStatistics Valid=57, Invalid=699, Unknown=0, NotChecked=0, Total=756 [2021-05-06 04:58:53,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-06 04:58:53,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-06 04:58:53,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 66 states have (on average 1.0151515151515151) internal successors, (67), 66 states have internal predecessors, (67), 26 states have call successors, (26), 8 states have call predecessors, (26), 6 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-06 04:58:53,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 117 transitions. [2021-05-06 04:58:53,707 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 117 transitions. Word has length 163 [2021-05-06 04:58:53,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:58:53,707 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 117 transitions. [2021-05-06 04:58:53,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 23 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (23), 22 states have call predecessors, (23), 22 states have call successors, (23) [2021-05-06 04:58:53,708 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 117 transitions. [2021-05-06 04:58:53,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-05-06 04:58:53,708 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:58:53,708 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:58:53,914 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:53,914 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:58:53,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:58:53,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1329797496, now seen corresponding path program 21 times [2021-05-06 04:58:53,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:58:53,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520133998] [2021-05-06 04:58:53,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:58:53,925 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:58:53,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2055948066] [2021-05-06 04:58:53,926 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:54,921 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-06 04:58:54,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:58:54,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 92 conjunts are in the unsatisfiable core [2021-05-06 04:58:54,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:58:55,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:55,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:55,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:55,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:55,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:55,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:55,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:55,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:55,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:55,514 INFO L134 CoverageAnalysis]: Checked inductivity of 1661 backedges. 44 proven. 693 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2021-05-06 04:58:55,514 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:58:55,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520133998] [2021-05-06 04:58:55,514 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:58:55,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2055948066] [2021-05-06 04:58:55,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2055948066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:58:55,515 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:58:55,515 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2021-05-06 04:58:55,515 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329261312] [2021-05-06 04:58:55,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 04:58:55,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:58:55,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 04:58:55,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2021-05-06 04:58:55,516 INFO L87 Difference]: Start difference. First operand 99 states and 117 transitions. Second operand has 27 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 26 states have internal predecessors, (57), 24 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 23 states have call predecessors, (24), 23 states have call successors, (24) [2021-05-06 04:58:56,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:58:56,353 INFO L93 Difference]: Finished difference Result 107 states and 126 transitions. [2021-05-06 04:58:56,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 04:58:56,353 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 26 states have internal predecessors, (57), 24 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 23 states have call predecessors, (24), 23 states have call successors, (24) Word has length 170 [2021-05-06 04:58:56,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:58:56,354 INFO L225 Difference]: With dead ends: 107 [2021-05-06 04:58:56,354 INFO L226 Difference]: Without dead ends: 102 [2021-05-06 04:58:56,354 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 413.0ms TimeCoverageRelationStatistics Valid=59, Invalid=753, Unknown=0, NotChecked=0, Total=812 [2021-05-06 04:58:56,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-06 04:58:56,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2021-05-06 04:58:56,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 68 states have (on average 1.0147058823529411) internal successors, (69), 68 states have internal predecessors, (69), 27 states have call successors, (27), 8 states have call predecessors, (27), 6 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-05-06 04:58:56,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 121 transitions. [2021-05-06 04:58:56,361 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 121 transitions. Word has length 170 [2021-05-06 04:58:56,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:58:56,361 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 121 transitions. [2021-05-06 04:58:56,361 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 26 states have internal predecessors, (57), 24 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 23 states have call predecessors, (24), 23 states have call successors, (24) [2021-05-06 04:58:56,361 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 121 transitions. [2021-05-06 04:58:56,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-05-06 04:58:56,362 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:58:56,362 INFO L523 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:58:56,569 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-06 04:58:56,570 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:58:56,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:58:56,570 INFO L82 PathProgramCache]: Analyzing trace with hash -1612717687, now seen corresponding path program 22 times [2021-05-06 04:58:56,570 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:58:56,570 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011070139] [2021-05-06 04:58:56,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:58:56,575 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:58:56,575 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [209948822] [2021-05-06 04:58:56,575 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:58:57,285 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 04:58:57,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:58:57,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 96 conjunts are in the unsatisfiable core [2021-05-06 04:58:57,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:58:57,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:57,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:57,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:57,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:57,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:57,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:57,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:57,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:57,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:58:57,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1817 backedges. 46 proven. 759 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2021-05-06 04:58:57,983 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:58:57,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011070139] [2021-05-06 04:58:57,983 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:58:57,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209948822] [2021-05-06 04:58:57,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209948822] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:58:57,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:58:57,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2021-05-06 04:58:57,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997108980] [2021-05-06 04:58:57,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 04:58:57,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:58:57,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 04:58:57,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2021-05-06 04:58:57,985 INFO L87 Difference]: Start difference. First operand 102 states and 121 transitions. Second operand has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 27 states have internal predecessors, (59), 25 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (25), 24 states have call predecessors, (25), 24 states have call successors, (25) [2021-05-06 04:58:58,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:58:58,904 INFO L93 Difference]: Finished difference Result 110 states and 130 transitions. [2021-05-06 04:58:58,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 04:58:58,905 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 27 states have internal predecessors, (59), 25 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (25), 24 states have call predecessors, (25), 24 states have call successors, (25) Word has length 177 [2021-05-06 04:58:58,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:58:58,905 INFO L225 Difference]: With dead ends: 110 [2021-05-06 04:58:58,905 INFO L226 Difference]: Without dead ends: 105 [2021-05-06 04:58:58,906 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 480.7ms TimeCoverageRelationStatistics Valid=61, Invalid=809, Unknown=0, NotChecked=0, Total=870 [2021-05-06 04:58:58,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-06 04:58:58,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2021-05-06 04:58:58,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 70 states have (on average 1.0142857142857142) internal successors, (71), 70 states have internal predecessors, (71), 28 states have call successors, (28), 8 states have call predecessors, (28), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-06 04:58:58,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 125 transitions. [2021-05-06 04:58:58,912 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 125 transitions. Word has length 177 [2021-05-06 04:58:58,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:58:58,912 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 125 transitions. [2021-05-06 04:58:58,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 27 states have internal predecessors, (59), 25 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (25), 24 states have call predecessors, (25), 24 states have call successors, (25) [2021-05-06 04:58:58,912 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 125 transitions. [2021-05-06 04:58:58,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-05-06 04:58:58,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:58:58,913 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:58:59,119 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-06 04:58:59,119 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:58:59,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:58:59,119 INFO L82 PathProgramCache]: Analyzing trace with hash -178408600, now seen corresponding path program 23 times [2021-05-06 04:58:59,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:58:59,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970851700] [2021-05-06 04:58:59,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:58:59,127 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:58:59,127 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1344790078] [2021-05-06 04:58:59,127 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:17,887 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-05-06 04:59:17,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:59:17,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-06 04:59:17,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:18,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:18,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:18,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:18,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:18,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:18,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:18,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:18,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:18,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:18,619 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 48 proven. 828 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2021-05-06 04:59:18,619 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:18,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970851700] [2021-05-06 04:59:18,619 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:18,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344790078] [2021-05-06 04:59:18,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344790078] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:59:18,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:59:18,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2021-05-06 04:59:18,620 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799831956] [2021-05-06 04:59:18,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 04:59:18,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:18,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 04:59:18,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2021-05-06 04:59:18,620 INFO L87 Difference]: Start difference. First operand 105 states and 125 transitions. Second operand has 29 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 28 states have internal predecessors, (61), 26 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 25 states have call predecessors, (26), 25 states have call successors, (26) [2021-05-06 04:59:19,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:19,649 INFO L93 Difference]: Finished difference Result 113 states and 134 transitions. [2021-05-06 04:59:19,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 04:59:19,650 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 28 states have internal predecessors, (61), 26 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 25 states have call predecessors, (26), 25 states have call successors, (26) Word has length 184 [2021-05-06 04:59:19,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:19,650 INFO L225 Difference]: With dead ends: 113 [2021-05-06 04:59:19,650 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 04:59:19,651 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 525.3ms TimeCoverageRelationStatistics Valid=63, Invalid=867, Unknown=0, NotChecked=0, Total=930 [2021-05-06 04:59:19,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 04:59:19,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2021-05-06 04:59:19,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 72 states have (on average 1.0138888888888888) internal successors, (73), 72 states have internal predecessors, (73), 29 states have call successors, (29), 8 states have call predecessors, (29), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-06 04:59:19,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 129 transitions. [2021-05-06 04:59:19,660 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 129 transitions. Word has length 184 [2021-05-06 04:59:19,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:19,660 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 129 transitions. [2021-05-06 04:59:19,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 28 states have internal predecessors, (61), 26 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 25 states have call predecessors, (26), 25 states have call successors, (26) [2021-05-06 04:59:19,660 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 129 transitions. [2021-05-06 04:59:19,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-06 04:59:19,661 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:19,661 INFO L523 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:59:19,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-06 04:59:19,861 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:19,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:19,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1007212713, now seen corresponding path program 24 times [2021-05-06 04:59:19,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:19,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549632464] [2021-05-06 04:59:19,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:19,866 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:19,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1473640057] [2021-05-06 04:59:19,866 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:20,848 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-06 04:59:20,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:59:20,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 520 conjuncts, 105 conjunts are in the unsatisfiable core [2021-05-06 04:59:20,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:20,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:20,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:21,665 INFO L134 CoverageAnalysis]: Checked inductivity of 2150 backedges. 50 proven. 900 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2021-05-06 04:59:21,665 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:21,665 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549632464] [2021-05-06 04:59:21,665 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:21,665 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473640057] [2021-05-06 04:59:21,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473640057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:59:21,666 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:59:21,666 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2021-05-06 04:59:21,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584431052] [2021-05-06 04:59:21,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 04:59:21,666 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:21,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 04:59:21,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2021-05-06 04:59:21,667 INFO L87 Difference]: Start difference. First operand 108 states and 129 transitions. Second operand has 30 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 29 states have internal predecessors, (63), 27 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (27), 26 states have call predecessors, (27), 26 states have call successors, (27) [2021-05-06 04:59:22,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:22,738 INFO L93 Difference]: Finished difference Result 116 states and 138 transitions. [2021-05-06 04:59:22,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 04:59:22,739 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 29 states have internal predecessors, (63), 27 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (27), 26 states have call predecessors, (27), 26 states have call successors, (27) Word has length 191 [2021-05-06 04:59:22,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:22,740 INFO L225 Difference]: With dead ends: 116 [2021-05-06 04:59:22,740 INFO L226 Difference]: Without dead ends: 111 [2021-05-06 04:59:22,740 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 558.6ms TimeCoverageRelationStatistics Valid=65, Invalid=927, Unknown=0, NotChecked=0, Total=992 [2021-05-06 04:59:22,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-06 04:59:22,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-06 04:59:22,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 74 states have (on average 1.0135135135135136) internal successors, (75), 74 states have internal predecessors, (75), 30 states have call successors, (30), 8 states have call predecessors, (30), 6 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-06 04:59:22,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 133 transitions. [2021-05-06 04:59:22,747 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 133 transitions. Word has length 191 [2021-05-06 04:59:22,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:22,747 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 133 transitions. [2021-05-06 04:59:22,747 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 29 states have internal predecessors, (63), 27 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (27), 26 states have call predecessors, (27), 26 states have call successors, (27) [2021-05-06 04:59:22,747 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 133 transitions. [2021-05-06 04:59:22,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2021-05-06 04:59:22,748 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:22,748 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:59:22,954 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:22,955 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:22,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:22,955 INFO L82 PathProgramCache]: Analyzing trace with hash 447117384, now seen corresponding path program 25 times [2021-05-06 04:59:22,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:22,955 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963365117] [2021-05-06 04:59:22,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:22,959 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:22,959 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [893124030] [2021-05-06 04:59:22,959 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:23,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:59:23,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 109 conjunts are in the unsatisfiable core [2021-05-06 04:59:23,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:23,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:23,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:24,451 INFO L134 CoverageAnalysis]: Checked inductivity of 2327 backedges. 52 proven. 975 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2021-05-06 04:59:24,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:24,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963365117] [2021-05-06 04:59:24,451 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:24,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893124030] [2021-05-06 04:59:24,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893124030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:59:24,451 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:59:24,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2021-05-06 04:59:24,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413772687] [2021-05-06 04:59:24,452 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 04:59:24,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:24,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 04:59:24,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2021-05-06 04:59:24,452 INFO L87 Difference]: Start difference. First operand 111 states and 133 transitions. Second operand has 31 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 30 states have internal predecessors, (65), 28 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (28), 27 states have call predecessors, (28), 27 states have call successors, (28) [2021-05-06 04:59:25,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:25,596 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2021-05-06 04:59:25,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 04:59:25,596 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 30 states have internal predecessors, (65), 28 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (28), 27 states have call predecessors, (28), 27 states have call successors, (28) Word has length 198 [2021-05-06 04:59:25,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:25,597 INFO L225 Difference]: With dead ends: 119 [2021-05-06 04:59:25,597 INFO L226 Difference]: Without dead ends: 114 [2021-05-06 04:59:25,598 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 607.9ms TimeCoverageRelationStatistics Valid=67, Invalid=989, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 04:59:25,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-06 04:59:25,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2021-05-06 04:59:25,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 76 states have (on average 1.013157894736842) internal successors, (77), 76 states have internal predecessors, (77), 31 states have call successors, (31), 8 states have call predecessors, (31), 6 states have return successors, (29), 29 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-06 04:59:25,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 137 transitions. [2021-05-06 04:59:25,604 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 137 transitions. Word has length 198 [2021-05-06 04:59:25,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:25,605 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 137 transitions. [2021-05-06 04:59:25,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 30 states have internal predecessors, (65), 28 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (28), 27 states have call predecessors, (28), 27 states have call successors, (28) [2021-05-06 04:59:25,605 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 137 transitions. [2021-05-06 04:59:25,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-05-06 04:59:25,605 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:25,605 INFO L523 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:59:25,811 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-05-06 04:59:25,811 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:25,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:25,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1629673417, now seen corresponding path program 26 times [2021-05-06 04:59:25,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:25,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086829809] [2021-05-06 04:59:25,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:25,817 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:25,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1478620061] [2021-05-06 04:59:25,817 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:26,460 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:59:26,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:59:26,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 112 conjunts are in the unsatisfiable core [2021-05-06 04:59:26,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:27,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:27,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:27,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:27,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:27,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:27,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:27,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:27,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:27,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:27,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2511 backedges. 54 proven. 1053 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2021-05-06 04:59:27,282 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:27,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086829809] [2021-05-06 04:59:27,282 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:27,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478620061] [2021-05-06 04:59:27,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478620061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:59:27,282 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:59:27,282 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2021-05-06 04:59:27,282 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886994984] [2021-05-06 04:59:27,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 04:59:27,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:27,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 04:59:27,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2021-05-06 04:59:27,283 INFO L87 Difference]: Start difference. First operand 114 states and 137 transitions. Second operand has 32 states, 31 states have (on average 2.161290322580645) internal successors, (67), 31 states have internal predecessors, (67), 29 states have call successors, (31), 2 states have call predecessors, (31), 1 states have return successors, (29), 28 states have call predecessors, (29), 28 states have call successors, (29) [2021-05-06 04:59:28,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:28,488 INFO L93 Difference]: Finished difference Result 122 states and 146 transitions. [2021-05-06 04:59:28,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 04:59:28,488 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.161290322580645) internal successors, (67), 31 states have internal predecessors, (67), 29 states have call successors, (31), 2 states have call predecessors, (31), 1 states have return successors, (29), 28 states have call predecessors, (29), 28 states have call successors, (29) Word has length 205 [2021-05-06 04:59:28,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:28,489 INFO L225 Difference]: With dead ends: 122 [2021-05-06 04:59:28,489 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 04:59:28,489 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 593.5ms TimeCoverageRelationStatistics Valid=69, Invalid=1053, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 04:59:28,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 04:59:28,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-06 04:59:28,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 78 states have (on average 1.0128205128205128) internal successors, (79), 78 states have internal predecessors, (79), 32 states have call successors, (32), 8 states have call predecessors, (32), 6 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-06 04:59:28,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 141 transitions. [2021-05-06 04:59:28,497 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 141 transitions. Word has length 205 [2021-05-06 04:59:28,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:28,497 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 141 transitions. [2021-05-06 04:59:28,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 2.161290322580645) internal successors, (67), 31 states have internal predecessors, (67), 29 states have call successors, (31), 2 states have call predecessors, (31), 1 states have return successors, (29), 28 states have call predecessors, (29), 28 states have call successors, (29) [2021-05-06 04:59:28,497 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 141 transitions. [2021-05-06 04:59:28,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-05-06 04:59:28,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:28,498 INFO L523 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:59:28,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:28,705 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:28,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:28,705 INFO L82 PathProgramCache]: Analyzing trace with hash -12241624, now seen corresponding path program 27 times [2021-05-06 04:59:28,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:28,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279949248] [2021-05-06 04:59:28,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:28,710 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:28,710 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1073118831] [2021-05-06 04:59:28,710 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:29,931 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-05-06 04:59:29,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:59:29,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 116 conjunts are in the unsatisfiable core [2021-05-06 04:59:29,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:30,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2702 backedges. 56 proven. 1134 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2021-05-06 04:59:30,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:30,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279949248] [2021-05-06 04:59:30,798 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:30,798 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073118831] [2021-05-06 04:59:30,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073118831] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:59:30,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:59:30,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2021-05-06 04:59:30,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679678314] [2021-05-06 04:59:30,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 04:59:30,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:30,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 04:59:30,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 04:59:30,799 INFO L87 Difference]: Start difference. First operand 117 states and 141 transitions. Second operand has 33 states, 32 states have (on average 2.15625) internal successors, (69), 32 states have internal predecessors, (69), 30 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (30), 29 states have call predecessors, (30), 29 states have call successors, (30) [2021-05-06 04:59:32,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:32,120 INFO L93 Difference]: Finished difference Result 125 states and 150 transitions. [2021-05-06 04:59:32,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 04:59:32,121 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.15625) internal successors, (69), 32 states have internal predecessors, (69), 30 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (30), 29 states have call predecessors, (30), 29 states have call successors, (30) Word has length 212 [2021-05-06 04:59:32,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:32,121 INFO L225 Difference]: With dead ends: 125 [2021-05-06 04:59:32,121 INFO L226 Difference]: Without dead ends: 120 [2021-05-06 04:59:32,122 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 633.5ms TimeCoverageRelationStatistics Valid=71, Invalid=1119, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 04:59:32,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-06 04:59:32,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2021-05-06 04:59:32,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 80 states have (on average 1.0125) internal successors, (81), 80 states have internal predecessors, (81), 33 states have call successors, (33), 8 states have call predecessors, (33), 6 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 04:59:32,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 145 transitions. [2021-05-06 04:59:32,129 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 145 transitions. Word has length 212 [2021-05-06 04:59:32,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:32,129 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 145 transitions. [2021-05-06 04:59:32,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 2.15625) internal successors, (69), 32 states have internal predecessors, (69), 30 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (30), 29 states have call predecessors, (30), 29 states have call successors, (30) [2021-05-06 04:59:32,130 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 145 transitions. [2021-05-06 04:59:32,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2021-05-06 04:59:32,130 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:32,131 INFO L523 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:59:32,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-06 04:59:32,338 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:32,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:32,339 INFO L82 PathProgramCache]: Analyzing trace with hash -255861015, now seen corresponding path program 28 times [2021-05-06 04:59:32,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:32,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870692693] [2021-05-06 04:59:32,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:32,345 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:32,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2143177041] [2021-05-06 04:59:32,345 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:33,028 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 04:59:33,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:59:33,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 120 conjunts are in the unsatisfiable core [2021-05-06 04:59:33,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:33,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:33,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:33,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:33,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:33,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:33,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:33,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:33,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:33,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:33,917 INFO L134 CoverageAnalysis]: Checked inductivity of 2900 backedges. 58 proven. 1218 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2021-05-06 04:59:33,918 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:33,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870692693] [2021-05-06 04:59:33,918 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:33,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143177041] [2021-05-06 04:59:33,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143177041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:59:33,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:59:33,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2021-05-06 04:59:33,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482218298] [2021-05-06 04:59:33,918 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 04:59:33,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:33,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 04:59:33,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 04:59:33,919 INFO L87 Difference]: Start difference. First operand 120 states and 145 transitions. Second operand has 34 states, 33 states have (on average 2.1515151515151514) internal successors, (71), 33 states have internal predecessors, (71), 31 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (31), 30 states have call predecessors, (31), 30 states have call successors, (31) [2021-05-06 04:59:35,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:35,325 INFO L93 Difference]: Finished difference Result 128 states and 154 transitions. [2021-05-06 04:59:35,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 04:59:35,326 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 2.1515151515151514) internal successors, (71), 33 states have internal predecessors, (71), 31 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (31), 30 states have call predecessors, (31), 30 states have call successors, (31) Word has length 219 [2021-05-06 04:59:35,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:35,327 INFO L225 Difference]: With dead ends: 128 [2021-05-06 04:59:35,327 INFO L226 Difference]: Without dead ends: 123 [2021-05-06 04:59:35,327 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 661.5ms TimeCoverageRelationStatistics Valid=73, Invalid=1187, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 04:59:35,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-05-06 04:59:35,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2021-05-06 04:59:35,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 82 states have (on average 1.0121951219512195) internal successors, (83), 82 states have internal predecessors, (83), 34 states have call successors, (34), 8 states have call predecessors, (34), 6 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-06 04:59:35,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 149 transitions. [2021-05-06 04:59:35,334 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 149 transitions. Word has length 219 [2021-05-06 04:59:35,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:35,335 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 149 transitions. [2021-05-06 04:59:35,335 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 2.1515151515151514) internal successors, (71), 33 states have internal predecessors, (71), 31 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (31), 30 states have call predecessors, (31), 30 states have call successors, (31) [2021-05-06 04:59:35,335 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 149 transitions. [2021-05-06 04:59:35,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-05-06 04:59:35,336 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:35,336 INFO L523 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:59:35,540 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-06 04:59:35,541 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:35,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:35,541 INFO L82 PathProgramCache]: Analyzing trace with hash 963111432, now seen corresponding path program 29 times [2021-05-06 04:59:35,541 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:35,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658338909] [2021-05-06 04:59:35,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:35,546 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:35,546 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1620142131] [2021-05-06 04:59:35,546 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true