/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/cohencu-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:57:16,351 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:57:16,352 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:57:16,374 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:57:16,381 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:57:16,381 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:57:16,382 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:57:16,383 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:57:16,383 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:57:16,384 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:57:16,385 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:57:16,387 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:57:16,388 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:57:16,389 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:57:16,390 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:57:16,390 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:57:16,392 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:57:16,397 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:57:16,398 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:57:16,398 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:57:16,402 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:57:16,419 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:57:16,420 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:57:16,421 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:57:16,421 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:57:16,421 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:57:16,421 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:57:16,421 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:57:16,421 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:57:16,421 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:57:16,421 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:57:16,421 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:57:16,421 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:57:16,431 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:57:16,432 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:57:16,432 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:57:16,432 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:57:16,432 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:57:16,432 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:57:16,432 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:57:16,432 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:57:16,432 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:57:16,433 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:57:16,433 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:57:16,433 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:57:16,433 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:57:16,433 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:57:16,433 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:57:16,433 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:57:16,433 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:57:16,627 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:57:16,640 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:57:16,642 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:57:16,643 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:57:16,643 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:57:16,644 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound50.c [2021-05-02 13:57:16,693 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a920ecf0/15034049c09d4432bcc9a4719ab105ee/FLAGd21658050 [2021-05-02 13:57:17,042 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:57:17,043 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound50.c [2021-05-02 13:57:17,051 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a920ecf0/15034049c09d4432bcc9a4719ab105ee/FLAGd21658050 [2021-05-02 13:57:17,062 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a920ecf0/15034049c09d4432bcc9a4719ab105ee [2021-05-02 13:57:17,064 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:57:17,065 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:57:17,067 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:57:17,067 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:57:17,069 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:57:17,070 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:57:17" (1/1) ... [2021-05-02 13:57:17,070 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ed694cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17, skipping insertion in model container [2021-05-02 13:57:17,071 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:57:17" (1/1) ... [2021-05-02 13:57:17,075 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:57:17,084 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:57:17,173 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/cohencu-ll_unwindbound50.c[596,609] [2021-05-02 13:57:17,189 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:57:17,195 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:57:17,236 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/cohencu-ll_unwindbound50.c[596,609] [2021-05-02 13:57:17,242 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:57:17,251 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:57:17,251 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17 WrapperNode [2021-05-02 13:57:17,252 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:57:17,252 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:57:17,252 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:57:17,253 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:57:17,259 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17" (1/1) ... [2021-05-02 13:57:17,260 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17" (1/1) ... [2021-05-02 13:57:17,264 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17" (1/1) ... [2021-05-02 13:57:17,264 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17" (1/1) ... [2021-05-02 13:57:17,267 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17" (1/1) ... [2021-05-02 13:57:17,270 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17" (1/1) ... [2021-05-02 13:57:17,271 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17" (1/1) ... [2021-05-02 13:57:17,272 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:57:17,272 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:57:17,272 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:57:17,272 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:57:17,273 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:57:17,338 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:57:17,338 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:57:17,338 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:57:17,339 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 13:57:17,339 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:57:17,339 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:57:17,339 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:57:17,340 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:57:17,340 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:57:17,340 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:57:17,340 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_short [2021-05-02 13:57:17,341 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 13:57:17,341 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:57:17,341 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:57:17,342 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:57:17,342 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:57:17,343 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:57:17,343 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:57:17,343 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:57:17,343 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:57:17,623 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:57:17,623 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:57:17,624 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:57:17 BoogieIcfgContainer [2021-05-02 13:57:17,624 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:57:17,627 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:57:17,627 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:57:17,630 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:57:17,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:57:17" (1/3) ... [2021-05-02 13:57:17,631 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6df8d9ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:57:17, skipping insertion in model container [2021-05-02 13:57:17,631 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:57:17" (2/3) ... [2021-05-02 13:57:17,631 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6df8d9ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:57:17, skipping insertion in model container [2021-05-02 13:57:17,631 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:57:17" (3/3) ... [2021-05-02 13:57:17,633 INFO L111 eAbstractionObserver]: Analyzing ICFG cohencu-ll_unwindbound50.c [2021-05-02 13:57:17,639 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:57:17,642 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:57:17,653 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:57:17,678 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:57:17,678 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:57:17,678 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:57:17,678 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:57:17,679 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:57:17,679 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:57:17,679 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:57:17,679 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:57:17,692 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 13:57:17,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:57:17,696 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:17,696 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:17,697 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:17,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:17,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1839589780, now seen corresponding path program 1 times [2021-05-02 13:57:17,706 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:17,707 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977979162] [2021-05-02 13:57:17,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:17,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:17,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:57:17,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:17,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:57:17,920 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:17,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977979162] [2021-05-02 13:57:17,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977979162] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:57:17,921 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:57:17,921 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:57:17,921 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267191776] [2021-05-02 13:57:17,928 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:57:17,928 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:17,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:57:17,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:57:17,937 INFO L87 Difference]: Start difference. First operand has 31 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:57:18,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:18,057 INFO L93 Difference]: Finished difference Result 57 states and 95 transitions. [2021-05-02 13:57:18,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:57:18,058 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:57:18,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:18,063 INFO L225 Difference]: With dead ends: 57 [2021-05-02 13:57:18,063 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:57:18,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:57:18,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:57:18,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 13:57:18,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:57:18,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 37 transitions. [2021-05-02 13:57:18,116 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 37 transitions. Word has length 11 [2021-05-02 13:57:18,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:18,116 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 37 transitions. [2021-05-02 13:57:18,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:57:18,117 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 37 transitions. [2021-05-02 13:57:18,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:57:18,117 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:18,117 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:18,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:57:18,117 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:18,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:18,118 INFO L82 PathProgramCache]: Analyzing trace with hash 660459433, now seen corresponding path program 1 times [2021-05-02 13:57:18,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:18,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679173599] [2021-05-02 13:57:18,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:18,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:18,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:57:18,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:18,233 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:57:18,234 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:18,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679173599] [2021-05-02 13:57:18,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [679173599] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:57:18,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:57:18,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:57:18,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074652792] [2021-05-02 13:57:18,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:57:18,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:18,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:57:18,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:57:18,236 INFO L87 Difference]: Start difference. First operand 26 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:57:18,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:18,365 INFO L93 Difference]: Finished difference Result 40 states and 56 transitions. [2021-05-02 13:57:18,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:57:18,366 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 13:57:18,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:18,368 INFO L225 Difference]: With dead ends: 40 [2021-05-02 13:57:18,368 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:57:18,371 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 49.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:57:18,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:57:18,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 13:57:18,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:57:18,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-05-02 13:57:18,383 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 12 [2021-05-02 13:57:18,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:18,383 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-05-02 13:57:18,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:57:18,383 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-05-02 13:57:18,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:57:18,384 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:18,384 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:18,384 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:57:18,384 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:18,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:18,384 INFO L82 PathProgramCache]: Analyzing trace with hash 662008565, now seen corresponding path program 1 times [2021-05-02 13:57:18,384 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:18,385 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559211628] [2021-05-02 13:57:18,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:18,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:18,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:57:18,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:18,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:57:18,454 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:18,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559211628] [2021-05-02 13:57:18,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559211628] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:57:18,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:57:18,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:57:18,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757899584] [2021-05-02 13:57:18,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:57:18,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:18,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:57:18,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:57:18,456 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:57:18,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:18,667 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2021-05-02 13:57:18,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:57:18,668 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 13:57:18,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:18,670 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:57:18,670 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:57:18,671 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 122.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:57:18,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:57:18,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 13:57:18,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:57:18,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-02 13:57:18,688 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2021-05-02 13:57:18,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:18,688 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-02 13:57:18,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:57:18,689 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-02 13:57:18,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:57:18,690 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:18,690 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:18,690 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:57:18,691 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:18,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:18,692 INFO L82 PathProgramCache]: Analyzing trace with hash 2023221563, now seen corresponding path program 1 times [2021-05-02 13:57:18,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:18,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97151649] [2021-05-02 13:57:18,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:18,711 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:18,711 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1142382333] [2021-05-02 13:57:18,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:18,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:18,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:57:18,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:57:18,974 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:57:18,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:18,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97151649] [2021-05-02 13:57:18,975 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:57:18,975 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142382333] [2021-05-02 13:57:18,975 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1142382333] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:57:18,975 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:57:18,975 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:57:18,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729192463] [2021-05-02 13:57:18,976 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:57:18,976 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:18,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:57:18,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:57:18,977 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:57:19,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:19,187 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2021-05-02 13:57:19,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:57:19,187 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-05-02 13:57:19,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:19,188 INFO L225 Difference]: With dead ends: 54 [2021-05-02 13:57:19,188 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 13:57:19,189 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 62.8ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:57:19,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 13:57:19,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 13:57:19,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 23 states have call successors, (23), 6 states have call predecessors, (23), 5 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 13:57:19,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 70 transitions. [2021-05-02 13:57:19,203 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 70 transitions. Word has length 17 [2021-05-02 13:57:19,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:19,203 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 70 transitions. [2021-05-02 13:57:19,203 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:57:19,204 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 70 transitions. [2021-05-02 13:57:19,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:57:19,204 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:19,204 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:19,419 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:19,419 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:19,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:19,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1612678773, now seen corresponding path program 1 times [2021-05-02 13:57:19,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:19,420 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581111717] [2021-05-02 13:57:19,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:19,427 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:19,427 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [918186173] [2021-05-02 13:57:19,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:19,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:19,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:57:19,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:57:19,553 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:57:19,553 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:19,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581111717] [2021-05-02 13:57:19,553 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:57:19,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918186173] [2021-05-02 13:57:19,553 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918186173] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:57:19,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:57:19,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:57:19,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060621107] [2021-05-02 13:57:19,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:57:19,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:19,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:57:19,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:57:19,555 INFO L87 Difference]: Start difference. First operand 51 states and 70 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:57:19,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:19,731 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2021-05-02 13:57:19,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:57:19,732 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-05-02 13:57:19,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:19,734 INFO L225 Difference]: With dead ends: 58 [2021-05-02 13:57:19,734 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:57:19,735 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 46.7ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:57:19,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:57:19,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 13:57:19,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 23 states have call successors, (23), 7 states have call predecessors, (23), 6 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 13:57:19,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 73 transitions. [2021-05-02 13:57:19,752 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 73 transitions. Word has length 22 [2021-05-02 13:57:19,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:19,752 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 73 transitions. [2021-05-02 13:57:19,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:57:19,753 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 73 transitions. [2021-05-02 13:57:19,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:57:19,754 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:19,754 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:19,973 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:19,974 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:19,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:19,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1625830715, now seen corresponding path program 1 times [2021-05-02 13:57:19,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:19,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935551236] [2021-05-02 13:57:19,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:19,984 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:19,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2081525352] [2021-05-02 13:57:19,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:20,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:20,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:57:20,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:57:20,116 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:57:20,117 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:20,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935551236] [2021-05-02 13:57:20,117 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:57:20,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081525352] [2021-05-02 13:57:20,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081525352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:57:20,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:57:20,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:57:20,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905822222] [2021-05-02 13:57:20,117 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:57:20,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:20,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:57:20,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:57:20,118 INFO L87 Difference]: Start difference. First operand 55 states and 73 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 13:57:20,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:20,266 INFO L93 Difference]: Finished difference Result 62 states and 79 transitions. [2021-05-02 13:57:20,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:57:20,266 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 27 [2021-05-02 13:57:20,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:20,267 INFO L225 Difference]: With dead ends: 62 [2021-05-02 13:57:20,267 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 13:57:20,267 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 36.1ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:57:20,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 13:57:20,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 13:57:20,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 13:57:20,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2021-05-02 13:57:20,273 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 27 [2021-05-02 13:57:20,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:20,273 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2021-05-02 13:57:20,273 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 13:57:20,273 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2021-05-02 13:57:20,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:57:20,274 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:20,274 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:20,488 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:20,489 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:20,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:20,489 INFO L82 PathProgramCache]: Analyzing trace with hash 1440923632, now seen corresponding path program 1 times [2021-05-02 13:57:20,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:20,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679164404] [2021-05-02 13:57:20,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:20,504 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:20,504 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1840735168] [2021-05-02 13:57:20,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:20,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:20,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:57:20,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:57:20,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:20,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:20,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:20,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:20,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:20,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:20,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:20,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:20,645 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:57:20,645 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:20,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679164404] [2021-05-02 13:57:20,645 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:57:20,646 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840735168] [2021-05-02 13:57:20,646 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840735168] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:57:20,646 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:57:20,646 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 13:57:20,646 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247272841] [2021-05-02 13:57:20,646 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:57:20,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:20,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:57:20,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:57:20,647 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:57:20,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:20,682 INFO L93 Difference]: Finished difference Result 72 states and 87 transitions. [2021-05-02 13:57:20,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:57:20,682 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-05-02 13:57:20,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:20,683 INFO L225 Difference]: With dead ends: 72 [2021-05-02 13:57:20,683 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:57:20,683 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 10.5ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:57:20,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:57:20,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 13:57:20,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 13:57:20,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2021-05-02 13:57:20,688 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 45 [2021-05-02 13:57:20,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:20,688 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2021-05-02 13:57:20,688 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:57:20,689 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2021-05-02 13:57:20,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:57:20,689 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:20,689 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:20,905 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:20,905 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:20,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:20,905 INFO L82 PathProgramCache]: Analyzing trace with hash 1933038948, now seen corresponding path program 1 times [2021-05-02 13:57:20,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:20,905 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856953151] [2021-05-02 13:57:20,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:20,911 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:20,912 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [816567393] [2021-05-02 13:57:20,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:20,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:20,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:57:20,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:57:21,074 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 26 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 13:57:21,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:21,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856953151] [2021-05-02 13:57:21,075 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:57:21,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816567393] [2021-05-02 13:57:21,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816567393] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:57:21,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:57:21,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:57:21,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894676882] [2021-05-02 13:57:21,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:57:21,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:21,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:57:21,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:57:21,076 INFO L87 Difference]: Start difference. First operand 56 states and 67 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:57:27,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:27,530 INFO L93 Difference]: Finished difference Result 78 states and 98 transitions. [2021-05-02 13:57:27,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:57:27,530 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-05-02 13:57:27,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:27,531 INFO L225 Difference]: With dead ends: 78 [2021-05-02 13:57:27,531 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 13:57:27,531 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 43.3ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:57:27,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 13:57:27,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 13:57:27,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 39 states have internal predecessors, (41), 28 states have call successors, (28), 10 states have call predecessors, (28), 9 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-02 13:57:27,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 95 transitions. [2021-05-02 13:57:27,538 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 95 transitions. Word has length 45 [2021-05-02 13:57:27,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:27,538 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 95 transitions. [2021-05-02 13:57:27,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:57:27,538 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 95 transitions. [2021-05-02 13:57:27,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:57:27,539 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:27,539 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:27,739 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:27,740 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:27,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:27,740 INFO L82 PathProgramCache]: Analyzing trace with hash 780782572, now seen corresponding path program 2 times [2021-05-02 13:57:27,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:27,740 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707189112] [2021-05-02 13:57:27,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:27,746 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:27,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [527525579] [2021-05-02 13:57:27,746 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:27,788 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:57:27,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:57:27,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:57:27,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:57:27,923 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 28 proven. 9 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 13:57:27,923 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:27,923 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707189112] [2021-05-02 13:57:27,923 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:57:27,923 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527525579] [2021-05-02 13:57:27,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527525579] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:57:27,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:57:27,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:57:27,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653098340] [2021-05-02 13:57:27,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:57:27,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:27,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:57:27,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:57:27,925 INFO L87 Difference]: Start difference. First operand 75 states and 95 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:57:28,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:28,127 INFO L93 Difference]: Finished difference Result 82 states and 101 transitions. [2021-05-02 13:57:28,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:57:28,127 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 50 [2021-05-02 13:57:28,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:28,128 INFO L225 Difference]: With dead ends: 82 [2021-05-02 13:57:28,128 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 13:57:28,128 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 47.7ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:57:28,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 13:57:28,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-02 13:57:28,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 27 states have call successors, (27), 11 states have call predecessors, (27), 10 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:57:28,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 95 transitions. [2021-05-02 13:57:28,142 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 95 transitions. Word has length 50 [2021-05-02 13:57:28,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:28,142 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 95 transitions. [2021-05-02 13:57:28,143 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:57:28,143 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 95 transitions. [2021-05-02 13:57:28,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 13:57:28,145 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:28,145 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:28,362 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:28,363 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:28,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:28,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1284663070, now seen corresponding path program 1 times [2021-05-02 13:57:28,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:28,363 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153687641] [2021-05-02 13:57:28,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:28,369 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:28,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2013755679] [2021-05-02 13:57:28,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:28,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:28,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:57:28,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:57:28,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:28,904 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 51 proven. 9 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-02 13:57:28,904 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:28,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153687641] [2021-05-02 13:57:28,904 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:57:28,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013755679] [2021-05-02 13:57:28,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013755679] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:57:28,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:57:28,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:57:28,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536709348] [2021-05-02 13:57:28,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:57:28,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:28,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:57:28,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:57:28,906 INFO L87 Difference]: Start difference. First operand 78 states and 95 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:57:29,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:29,121 INFO L93 Difference]: Finished difference Result 84 states and 100 transitions. [2021-05-02 13:57:29,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:57:29,121 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 71 [2021-05-02 13:57:29,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:29,125 INFO L225 Difference]: With dead ends: 84 [2021-05-02 13:57:29,125 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 13:57:29,125 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 154.1ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:57:29,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 13:57:29,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-05-02 13:57:29,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 45 states have internal predecessors, (47), 27 states have call successors, (27), 12 states have call predecessors, (27), 11 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:57:29,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 98 transitions. [2021-05-02 13:57:29,140 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 98 transitions. Word has length 71 [2021-05-02 13:57:29,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:29,140 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 98 transitions. [2021-05-02 13:57:29,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:57:29,140 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 98 transitions. [2021-05-02 13:57:29,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 13:57:29,144 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:29,144 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:29,349 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 13:57:29,349 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:29,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:29,349 INFO L82 PathProgramCache]: Analyzing trace with hash -2139863911, now seen corresponding path program 2 times [2021-05-02 13:57:29,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:29,350 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161018933] [2021-05-02 13:57:29,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:29,356 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:29,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1785798079] [2021-05-02 13:57:29,357 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:29,411 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:57:29,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:57:29,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:57:29,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:57:29,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:29,518 INFO L134 CoverageAnalysis]: Checked inductivity of 254 backedges. 60 proven. 112 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-05-02 13:57:29,518 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:29,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161018933] [2021-05-02 13:57:29,518 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:57:29,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785798079] [2021-05-02 13:57:29,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1785798079] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:57:29,518 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:57:29,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 13:57:29,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725814349] [2021-05-02 13:57:29,519 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:57:29,519 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:29,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:57:29,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:57:29,519 INFO L87 Difference]: Start difference. First operand 82 states and 98 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:57:29,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:29,618 INFO L93 Difference]: Finished difference Result 106 states and 125 transitions. [2021-05-02 13:57:29,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:57:29,619 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 73 [2021-05-02 13:57:29,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:29,622 INFO L225 Difference]: With dead ends: 106 [2021-05-02 13:57:29,622 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 13:57:29,622 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 51.0ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:57:29,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 13:57:29,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2021-05-02 13:57:29,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 50 states have internal predecessors, (53), 27 states have call successors, (27), 13 states have call predecessors, (27), 12 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:57:29,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 104 transitions. [2021-05-02 13:57:29,631 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 104 transitions. Word has length 73 [2021-05-02 13:57:29,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:29,632 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 104 transitions. [2021-05-02 13:57:29,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:57:29,632 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 104 transitions. [2021-05-02 13:57:29,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 13:57:29,634 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:29,634 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:29,844 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 13:57:29,845 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:29,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:29,845 INFO L82 PathProgramCache]: Analyzing trace with hash -1647748595, now seen corresponding path program 3 times [2021-05-02 13:57:29,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:29,846 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925651289] [2021-05-02 13:57:29,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:29,851 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:29,851 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [444432144] [2021-05-02 13:57:29,851 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:29,922 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:57:29,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:57:29,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:57:29,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:57:30,065 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 51 proven. 17 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-02 13:57:30,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:30,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925651289] [2021-05-02 13:57:30,066 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:57:30,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [444432144] [2021-05-02 13:57:30,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [444432144] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:57:30,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:57:30,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:57:30,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233577515] [2021-05-02 13:57:30,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:57:30,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:30,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:57:30,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:57:30,067 INFO L87 Difference]: Start difference. First operand 88 states and 104 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:57:30,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:30,311 INFO L93 Difference]: Finished difference Result 110 states and 135 transitions. [2021-05-02 13:57:30,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:57:30,311 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 73 [2021-05-02 13:57:30,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:30,312 INFO L225 Difference]: With dead ends: 110 [2021-05-02 13:57:30,312 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 13:57:30,313 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 57.6ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:57:30,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 13:57:30,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-05-02 13:57:30,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 58 states have internal predecessors, (61), 37 states have call successors, (37), 15 states have call predecessors, (37), 14 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-05-02 13:57:30,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 132 transitions. [2021-05-02 13:57:30,319 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 132 transitions. Word has length 73 [2021-05-02 13:57:30,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:30,320 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 132 transitions. [2021-05-02 13:57:30,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:57:30,320 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 132 transitions. [2021-05-02 13:57:30,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 13:57:30,320 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:30,321 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:30,536 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:30,537 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:30,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:30,537 INFO L82 PathProgramCache]: Analyzing trace with hash -904350414, now seen corresponding path program 1 times [2021-05-02 13:57:30,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:30,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517016016] [2021-05-02 13:57:30,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:30,543 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:30,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [336811354] [2021-05-02 13:57:30,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:30,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:57:30,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 13:57:30,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:57:30,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:57:30,767 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 53 proven. 12 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-05-02 13:57:30,767 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:57:30,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517016016] [2021-05-02 13:57:30,767 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:57:30,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [336811354] [2021-05-02 13:57:30,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [336811354] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:57:30,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:57:30,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:57:30,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865256030] [2021-05-02 13:57:30,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:57:30,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:57:30,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:57:30,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:57:30,770 INFO L87 Difference]: Start difference. First operand 107 states and 132 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-02 13:57:30,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:57:30,961 INFO L93 Difference]: Finished difference Result 113 states and 137 transitions. [2021-05-02 13:57:30,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:57:30,961 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) Word has length 76 [2021-05-02 13:57:30,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:57:30,963 INFO L225 Difference]: With dead ends: 113 [2021-05-02 13:57:30,963 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 13:57:30,963 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 65.4ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:57:30,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 13:57:30,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-02 13:57:30,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 57 states have (on average 1.087719298245614) internal successors, (62), 59 states have internal predecessors, (62), 37 states have call successors, (37), 16 states have call predecessors, (37), 14 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-05-02 13:57:30,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 133 transitions. [2021-05-02 13:57:30,970 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 133 transitions. Word has length 76 [2021-05-02 13:57:30,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:57:30,970 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 133 transitions. [2021-05-02 13:57:30,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-02 13:57:30,970 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 133 transitions. [2021-05-02 13:57:30,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 13:57:30,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:57:30,971 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:57:31,189 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:57:31,189 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:57:31,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:57:31,190 INFO L82 PathProgramCache]: Analyzing trace with hash 1454229731, now seen corresponding path program 4 times [2021-05-02 13:57:31,190 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:57:31,190 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82494067] [2021-05-02 13:57:31,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:57:31,195 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:57:31,195 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2139859858] [2021-05-02 13:57:31,195 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 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