/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/divbin_unwindbound50.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:39:57,371 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:39:57,373 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:39:57,416 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 14:39:57,437 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 14:39:57,440 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 14:39:57,441 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 14:39:57,444 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 14:39:57,447 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 14:39:57,448 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 14:39:57,451 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 14:39:57,456 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 14:39:57,457 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 14:39:57,459 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 14:39:57,460 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 14:39:57,462 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 14:39:57,468 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 14:39:57,477 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:39:57,477 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:39:57,478 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:39:57,482 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 14:39:57,519 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:39:57,520 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:39:57,523 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:39:57,523 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:39:57,523 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:39:57,523 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:39:57,523 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:39:57,524 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:39:57,524 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:39:57,524 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:39:57,525 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:39:57,525 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:39:57,525 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:39:57,525 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:39:57,526 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:39:57,526 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:39:57,526 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:39:57,526 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:39:57,526 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:39:57,526 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:39:57,527 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:39:57,527 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:39:57,527 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:39:57,527 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:39:57,528 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:39:57,528 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:39:57,528 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:39:57,528 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:39:57,528 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:39:57,901 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:39:57,926 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:39:57,928 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:39:57,929 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:39:57,930 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:39:57,931 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound50.i [2021-05-02 14:39:57,997 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fa0c0aaeb/687adfcc71ec45b4ba74e864e693dc08/FLAGf85b248d7 [2021-05-02 14:39:58,412 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:39:58,412 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound50.i [2021-05-02 14:39:58,419 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fa0c0aaeb/687adfcc71ec45b4ba74e864e693dc08/FLAGf85b248d7 [2021-05-02 14:39:58,797 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fa0c0aaeb/687adfcc71ec45b4ba74e864e693dc08 [2021-05-02 14:39:58,799 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:39:58,800 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:39:58,802 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:39:58,803 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:39:58,806 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:39:58,808 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:39:58" (1/1) ... [2021-05-02 14:39:58,809 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4900baf0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:58, skipping insertion in model container [2021-05-02 14:39:58,809 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:39:58" (1/1) ... [2021-05-02 14:39:58,815 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:39:58,830 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:39:58,937 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/divbin_unwindbound50.i[958,971] [2021-05-02 14:39:58,950 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:39:58,958 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:39:58,991 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/divbin_unwindbound50.i[958,971] [2021-05-02 14:39:59,012 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:39:59,024 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:39:59,024 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:59 WrapperNode [2021-05-02 14:39:59,025 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:39:59,026 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:39:59,027 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:39:59,027 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:39:59,035 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:59" (1/1) ... [2021-05-02 14:39:59,036 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:59" (1/1) ... [2021-05-02 14:39:59,041 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:59" (1/1) ... [2021-05-02 14:39:59,042 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:59" (1/1) ... [2021-05-02 14:39:59,046 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:59" (1/1) ... [2021-05-02 14:39:59,050 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:59" (1/1) ... [2021-05-02 14:39:59,051 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:59" (1/1) ... [2021-05-02 14:39:59,053 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:39:59,054 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:39:59,054 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:39:59,054 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:39:59,055 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:59" (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 14:39:59,126 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:39:59,127 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:39:59,127 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:39:59,127 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:39:59,127 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:39:59,127 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:39:59,127 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:39:59,128 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:39:59,128 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 14:39:59,128 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 14:39:59,128 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:39:59,129 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:39:59,129 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 14:39:59,129 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:39:59,130 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:39:59,130 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:39:59,130 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:39:59,130 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:39:59,130 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:39:59,130 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:39:59,130 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:39:59,130 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:39:59,477 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:39:59,477 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:39:59,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:39:59 BoogieIcfgContainer [2021-05-02 14:39:59,479 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:39:59,480 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:39:59,480 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:39:59,485 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:39:59,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:39:58" (1/3) ... [2021-05-02 14:39:59,486 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ff57112 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:39:59, skipping insertion in model container [2021-05-02 14:39:59,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:39:59" (2/3) ... [2021-05-02 14:39:59,487 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ff57112 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:39:59, skipping insertion in model container [2021-05-02 14:39:59,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:39:59" (3/3) ... [2021-05-02 14:39:59,489 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin_unwindbound50.i [2021-05-02 14:39:59,497 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:39:59,501 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:39:59,513 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:39:59,533 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:39:59,534 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:39:59,534 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:39:59,534 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:39:59,534 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:39:59,534 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:39:59,534 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:39:59,534 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:39:59,548 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:39:59,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 14:39:59,553 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:39:59,553 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:39:59,554 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:39:59,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:39:59,558 INFO L82 PathProgramCache]: Analyzing trace with hash 878397729, now seen corresponding path program 1 times [2021-05-02 14:39:59,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:39:59,566 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930417712] [2021-05-02 14:39:59,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:39:59,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:39:59,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:39:59,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:39:59,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 14:39:59,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:39:59,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 14:39:59,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:39:59,758 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:39:59,759 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:39:59,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930417712] [2021-05-02 14:39:59,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930417712] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:39:59,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:39:59,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:39:59,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036676787] [2021-05-02 14:39:59,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:39:59,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:39:59,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:39:59,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:39:59,777 INFO L87 Difference]: Start difference. First operand has 33 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:39:59,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:39:59,871 INFO L93 Difference]: Finished difference Result 60 states and 84 transitions. [2021-05-02 14:39:59,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:39:59,875 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 14:39:59,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:39:59,883 INFO L225 Difference]: With dead ends: 60 [2021-05-02 14:39:59,884 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 14:39:59,889 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:39:59,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 14:39:59,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-02 14:39:59,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:39:59,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-05-02 14:39:59,923 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 23 [2021-05-02 14:39:59,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:39:59,923 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-05-02 14:39:59,923 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:39:59,923 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-05-02 14:39:59,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 14:39:59,925 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:39:59,925 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:39:59,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:39:59,925 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:39:59,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:39:59,926 INFO L82 PathProgramCache]: Analyzing trace with hash 994169231, now seen corresponding path program 1 times [2021-05-02 14:39:59,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:39:59,927 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666264138] [2021-05-02 14:39:59,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:39:59,946 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:39:59,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1282218167] [2021-05-02 14:39:59,946 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 14:40:00,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:40:00,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:40:00,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:00,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,137 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:40:00,137 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:00,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666264138] [2021-05-02 14:40:00,137 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:00,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282218167] [2021-05-02 14:40:00,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282218167] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:40:00,138 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:40:00,138 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 14:40:00,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216755759] [2021-05-02 14:40:00,139 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 14:40:00,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:00,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 14:40:00,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:40:00,140 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:00,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:00,156 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2021-05-02 14:40:00,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 14:40:00,157 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-05-02 14:40:00,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:00,158 INFO L225 Difference]: With dead ends: 42 [2021-05-02 14:40:00,158 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 14:40:00,159 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.9ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:40:00,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 14:40:00,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 14:40:00,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:40:00,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-05-02 14:40:00,166 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 25 [2021-05-02 14:40:00,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:00,168 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-05-02 14:40:00,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:00,168 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-05-02 14:40:00,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 14:40:00,169 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:00,169 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:00,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 14:40:00,392 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:00,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:00,393 INFO L82 PathProgramCache]: Analyzing trace with hash 422434646, now seen corresponding path program 1 times [2021-05-02 14:40:00,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:00,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196355088] [2021-05-02 14:40:00,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:00,415 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:00,415 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1971331979] [2021-05-02 14:40:00,415 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 14:40:00,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:40:00,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:40:00,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:00,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:00,658 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:40:00,658 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:00,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196355088] [2021-05-02 14:40:00,658 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:00,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1971331979] [2021-05-02 14:40:00,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1971331979] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:40:00,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:40:00,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:40:00,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317842332] [2021-05-02 14:40:00,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:40:00,659 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:00,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:40:00,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:40:00,660 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:00,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:00,705 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-05-02 14:40:00,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:40:00,709 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-02 14:40:00,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:00,710 INFO L225 Difference]: With dead ends: 41 [2021-05-02 14:40:00,710 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 14:40:00,710 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 9.3ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:40:00,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 14:40:00,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 14:40:00,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:40:00,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2021-05-02 14:40:00,720 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 26 [2021-05-02 14:40:00,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:00,721 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2021-05-02 14:40:00,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:00,721 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2021-05-02 14:40:00,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 14:40:00,722 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:00,722 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:00,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:00,925 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:00,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:00,926 INFO L82 PathProgramCache]: Analyzing trace with hash 424222106, now seen corresponding path program 1 times [2021-05-02 14:40:00,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:00,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780580276] [2021-05-02 14:40:00,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:00,948 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:00,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [901680621] [2021-05-02 14:40:00,949 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 14:40:00,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:40:00,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 14:40:00,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:01,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,188 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 14:40:01,188 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:01,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780580276] [2021-05-02 14:40:01,188 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:01,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [901680621] [2021-05-02 14:40:01,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [901680621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:01,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:01,189 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:40:01,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392346764] [2021-05-02 14:40:01,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:40:01,189 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:01,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:40:01,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:40:01,190 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:01,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:01,339 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2021-05-02 14:40:01,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:40:01,340 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-02 14:40:01,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:01,341 INFO L225 Difference]: With dead ends: 45 [2021-05-02 14:40:01,341 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:40:01,341 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 86.3ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:40:01,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:40:01,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 14:40:01,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:40:01,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-05-02 14:40:01,349 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 26 [2021-05-02 14:40:01,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:01,349 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-05-02 14:40:01,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:01,350 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-05-02 14:40:01,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 14:40:01,350 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:01,350 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:01,564 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:01,565 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:01,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:01,565 INFO L82 PathProgramCache]: Analyzing trace with hash -193375877, now seen corresponding path program 1 times [2021-05-02 14:40:01,566 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:01,566 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017344829] [2021-05-02 14:40:01,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:01,581 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:01,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [19921614] [2021-05-02 14:40:01,582 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 14:40:01,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:40:01,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:40:01,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:01,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:01,774 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:40:01,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:01,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017344829] [2021-05-02 14:40:01,775 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:01,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19921614] [2021-05-02 14:40:01,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19921614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:01,775 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:01,775 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 14:40:01,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133438880] [2021-05-02 14:40:01,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:40:01,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:01,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:40:01,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:40:01,778 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:01,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:01,824 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2021-05-02 14:40:01,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:40:01,825 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-05-02 14:40:01,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:01,828 INFO L225 Difference]: With dead ends: 55 [2021-05-02 14:40:01,828 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 14:40:01,830 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 16.0ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:40:01,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 14:40:01,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-02 14:40:01,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 31 states have internal predecessors, (38), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:40:01,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-02 14:40:01,852 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 28 [2021-05-02 14:40:01,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:01,853 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-02 14:40:01,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:01,853 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-02 14:40:01,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:40:01,855 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:01,855 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:02,056 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:02,057 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:02,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:02,057 INFO L82 PathProgramCache]: Analyzing trace with hash -2031725334, now seen corresponding path program 1 times [2021-05-02 14:40:02,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:02,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752708201] [2021-05-02 14:40:02,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:02,090 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:02,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1708887830] [2021-05-02 14:40:02,090 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 14:40:02,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:40:02,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:40:02,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:02,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,277 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:40:02,277 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:02,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752708201] [2021-05-02 14:40:02,277 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:02,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708887830] [2021-05-02 14:40:02,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708887830] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:02,282 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:02,282 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:40:02,282 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807130214] [2021-05-02 14:40:02,282 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:40:02,282 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:02,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:40:02,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:40:02,284 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:02,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:02,338 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2021-05-02 14:40:02,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 14:40:02,339 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 14:40:02,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:02,341 INFO L225 Difference]: With dead ends: 64 [2021-05-02 14:40:02,341 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 14:40:02,343 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 20.8ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:40:02,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 14:40:02,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2021-05-02 14:40:02,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.25) internal successors, (50), 41 states have internal predecessors, (50), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:40:02,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-05-02 14:40:02,359 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 29 [2021-05-02 14:40:02,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:02,359 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-05-02 14:40:02,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:02,359 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-05-02 14:40:02,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:40:02,360 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:02,360 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:02,578 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 14:40:02,578 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:02,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:02,579 INFO L82 PathProgramCache]: Analyzing trace with hash -2029937874, now seen corresponding path program 1 times [2021-05-02 14:40:02,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:02,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882942765] [2021-05-02 14:40:02,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:02,588 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:02,588 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [472471970] [2021-05-02 14:40:02,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:40:02,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:40:02,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 14:40:02,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:02,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:02,867 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:40:02,868 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:02,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882942765] [2021-05-02 14:40:02,868 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:02,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472471970] [2021-05-02 14:40:02,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [472471970] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:02,868 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:02,868 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:40:02,868 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749153325] [2021-05-02 14:40:02,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:40:02,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:02,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:40:02,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:40:02,871 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:03,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:03,091 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-05-02 14:40:03,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:40:03,092 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 14:40:03,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:03,093 INFO L225 Difference]: With dead ends: 69 [2021-05-02 14:40:03,094 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 14:40:03,094 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 147.8ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:40:03,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 14:40:03,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 53. [2021-05-02 14:40:03,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 40 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:40:03,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-05-02 14:40:03,101 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 29 [2021-05-02 14:40:03,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:03,101 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-05-02 14:40:03,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:40:03,101 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-05-02 14:40:03,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 14:40:03,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:03,102 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:03,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:03,325 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:03,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:03,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1731935178, now seen corresponding path program 1 times [2021-05-02 14:40:03,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:03,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305673517] [2021-05-02 14:40:03,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:03,342 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:03,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1075582422] [2021-05-02 14:40:03,343 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 14:40:03,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:40:03,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 14:40:03,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:03,465 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:40:03,465 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:03,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305673517] [2021-05-02 14:40:03,465 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:03,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075582422] [2021-05-02 14:40:03,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1075582422] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:40:03,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:40:03,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:40:03,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753319757] [2021-05-02 14:40:03,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:40:03,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:03,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:40:03,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:40:03,467 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:40:03,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:03,481 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2021-05-02 14:40:03,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:40:03,482 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2021-05-02 14:40:03,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:03,483 INFO L225 Difference]: With dead ends: 74 [2021-05-02 14:40:03,483 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:40:03,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:40:03,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:40:03,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 14:40:03,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 31 states have internal predecessors, (37), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:40:03,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-05-02 14:40:03,488 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 35 [2021-05-02 14:40:03,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:03,488 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-05-02 14:40:03,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:40:03,488 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-05-02 14:40:03,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 14:40:03,489 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:03,489 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:03,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:03,713 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:03,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:03,713 INFO L82 PathProgramCache]: Analyzing trace with hash 815990494, now seen corresponding path program 1 times [2021-05-02 14:40:03,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:03,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906064343] [2021-05-02 14:40:03,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:03,723 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:03,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1891544960] [2021-05-02 14:40:03,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:40:03,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:40:03,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:40:03,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:03,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:03,896 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:40:03,896 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:03,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906064343] [2021-05-02 14:40:03,896 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:03,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1891544960] [2021-05-02 14:40:03,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1891544960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:03,900 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:03,900 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:40:03,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905542311] [2021-05-02 14:40:03,901 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:40:03,902 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:03,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:40:03,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:40:03,902 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 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 14:40:03,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:03,956 INFO L93 Difference]: Finished difference Result 67 states and 78 transitions. [2021-05-02 14:40:03,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:40:03,956 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 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 38 [2021-05-02 14:40:03,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:03,957 INFO L225 Difference]: With dead ends: 67 [2021-05-02 14:40:03,957 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 14:40:03,957 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 24.9ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:40:03,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 14:40:03,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-05-02 14:40:03,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:40:03,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-05-02 14:40:03,972 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 38 [2021-05-02 14:40:03,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:03,972 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-05-02 14:40:03,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 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 14:40:03,972 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-05-02 14:40:03,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 14:40:03,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:03,978 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:04,201 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 14:40:04,201 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:04,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:04,201 INFO L82 PathProgramCache]: Analyzing trace with hash 817777954, now seen corresponding path program 1 times [2021-05-02 14:40:04,201 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:04,201 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972852483] [2021-05-02 14:40:04,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:04,214 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:04,214 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [921446766] [2021-05-02 14:40:04,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:40:04,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:40:04,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 14:40:04,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:04,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:04,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:04,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:04,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:04,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:04,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:04,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:04,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:04,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:04,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:05,573 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:40:05,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:05,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972852483] [2021-05-02 14:40:05,573 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:05,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [921446766] [2021-05-02 14:40:05,574 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [921446766] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:05,574 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:05,574 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 14:40:05,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114820457] [2021-05-02 14:40:05,574 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 14:40:05,574 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:05,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 14:40:05,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:40:05,575 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:40:06,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:06,212 INFO L93 Difference]: Finished difference Result 79 states and 95 transitions. [2021-05-02 14:40:06,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 14:40:06,213 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2021-05-02 14:40:06,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:06,214 INFO L225 Difference]: With dead ends: 79 [2021-05-02 14:40:06,214 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 14:40:06,214 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 591.9ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-02 14:40:06,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 14:40:06,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 63. [2021-05-02 14:40:06,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 48 states have internal predecessors, (55), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:40:06,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2021-05-02 14:40:06,222 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 38 [2021-05-02 14:40:06,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:06,223 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2021-05-02 14:40:06,223 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:40:06,223 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2021-05-02 14:40:06,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 14:40:06,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:06,224 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:06,427 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:06,427 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:06,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:06,428 INFO L82 PathProgramCache]: Analyzing trace with hash 268409689, now seen corresponding path program 1 times [2021-05-02 14:40:06,428 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:06,428 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477136605] [2021-05-02 14:40:06,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:06,451 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:06,452 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1773837936] [2021-05-02 14:40:06,452 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 14:40:06,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:40:06,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:40:06,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:06,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,599 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:40:06,599 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:06,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477136605] [2021-05-02 14:40:06,599 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:06,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773837936] [2021-05-02 14:40:06,599 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773837936] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:06,599 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:06,599 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:40:06,600 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561434449] [2021-05-02 14:40:06,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:40:06,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:06,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:40:06,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:40:06,600 INFO L87 Difference]: Start difference. First operand 63 states and 73 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 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 14:40:06,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:06,648 INFO L93 Difference]: Finished difference Result 99 states and 116 transitions. [2021-05-02 14:40:06,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:40:06,648 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 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 40 [2021-05-02 14:40:06,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:06,651 INFO L225 Difference]: With dead ends: 99 [2021-05-02 14:40:06,651 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 14:40:06,652 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 24.5ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:40:06,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 14:40:06,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 14:40:06,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 48 states have (on average 1.1875) internal successors, (57), 50 states have internal predecessors, (57), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:40:06,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2021-05-02 14:40:06,660 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 40 [2021-05-02 14:40:06,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:06,661 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2021-05-02 14:40:06,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 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 14:40:06,661 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2021-05-02 14:40:06,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 14:40:06,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:06,662 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:06,879 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:06,879 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:06,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:06,879 INFO L82 PathProgramCache]: Analyzing trace with hash 829605357, now seen corresponding path program 2 times [2021-05-02 14:40:06,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:06,880 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208465483] [2021-05-02 14:40:06,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:06,888 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:06,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [741211772] [2021-05-02 14:40:06,888 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:06,952 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:40:06,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:40:06,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:40:06,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:06,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:06,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,057 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:40:07,057 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:07,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208465483] [2021-05-02 14:40:07,057 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:07,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741211772] [2021-05-02 14:40:07,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741211772] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:07,058 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:07,058 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:40:07,058 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826366198] [2021-05-02 14:40:07,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:40:07,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:07,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:40:07,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:40:07,059 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 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 14:40:07,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:07,120 INFO L93 Difference]: Finished difference Result 106 states and 125 transitions. [2021-05-02 14:40:07,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:40:07,120 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 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 43 [2021-05-02 14:40:07,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:07,122 INFO L225 Difference]: With dead ends: 106 [2021-05-02 14:40:07,122 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 14:40:07,124 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 37.7ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:40:07,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 14:40:07,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2021-05-02 14:40:07,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 51 states have (on average 1.196078431372549) internal successors, (61), 53 states have internal predecessors, (61), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:40:07,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-02 14:40:07,137 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 43 [2021-05-02 14:40:07,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:07,137 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-02 14:40:07,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 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 14:40:07,138 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-02 14:40:07,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 14:40:07,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:07,139 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:07,363 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 14:40:07,363 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:07,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:07,363 INFO L82 PathProgramCache]: Analyzing trace with hash -897932583, now seen corresponding path program 3 times [2021-05-02 14:40:07,364 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:07,364 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630790016] [2021-05-02 14:40:07,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:07,378 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:07,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [203742822] [2021-05-02 14:40:07,379 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:07,455 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 14:40:07,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:40:07,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 14:40:07,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:07,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,546 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 14:40:07,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:07,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630790016] [2021-05-02 14:40:07,546 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:07,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203742822] [2021-05-02 14:40:07,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203742822] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:40:07,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:40:07,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:40:07,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412237083] [2021-05-02 14:40:07,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:40:07,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:07,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:40:07,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:40:07,548 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:40:07,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:07,576 INFO L93 Difference]: Finished difference Result 97 states and 112 transitions. [2021-05-02 14:40:07,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:40:07,577 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 46 [2021-05-02 14:40:07,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:07,578 INFO L225 Difference]: With dead ends: 97 [2021-05-02 14:40:07,578 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 14:40:07,578 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.2ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:40:07,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 14:40:07,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2021-05-02 14:40:07,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 35 states have internal predecessors, (40), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:40:07,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2021-05-02 14:40:07,585 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 46 [2021-05-02 14:40:07,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:07,585 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2021-05-02 14:40:07,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:40:07,585 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2021-05-02 14:40:07,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 14:40:07,585 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:07,585 INFO L523 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1] [2021-05-02 14:40:07,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 14:40:07,801 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:07,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:07,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1469925226, now seen corresponding path program 2 times [2021-05-02 14:40:07,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:07,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1418142331] [2021-05-02 14:40:07,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:07,809 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:07,809 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1217157840] [2021-05-02 14:40:07,809 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:07,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:40:07,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:40:07,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 14:40:07,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:07,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:07,992 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:40:07,992 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:07,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1418142331] [2021-05-02 14:40:07,992 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:07,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217157840] [2021-05-02 14:40:07,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217157840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:07,992 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:07,992 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:40:07,992 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824405900] [2021-05-02 14:40:07,993 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:40:07,993 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:07,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:40:07,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:40:07,993 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:40:08,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:08,067 INFO L93 Difference]: Finished difference Result 98 states and 110 transitions. [2021-05-02 14:40:08,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:40:08,068 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 14:40:08,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:08,069 INFO L225 Difference]: With dead ends: 98 [2021-05-02 14:40:08,069 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 14:40:08,070 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 41.6ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:40:08,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 14:40:08,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 71. [2021-05-02 14:40:08,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 53 states have (on average 1.169811320754717) internal successors, (62), 54 states have internal predecessors, (62), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:40:08,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 80 transitions. [2021-05-02 14:40:08,078 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 80 transitions. Word has length 47 [2021-05-02 14:40:08,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:08,079 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 80 transitions. [2021-05-02 14:40:08,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:40:08,079 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 80 transitions. [2021-05-02 14:40:08,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 14:40:08,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:08,080 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 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 14:40:08,293 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 14:40:08,293 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:08,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:08,293 INFO L82 PathProgramCache]: Analyzing trace with hash 1471712686, now seen corresponding path program 2 times [2021-05-02 14:40:08,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:08,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947699546] [2021-05-02 14:40:08,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:08,308 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:08,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [622113215] [2021-05-02 14:40:08,308 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:08,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:40:08,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:40:08,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 14:40:08,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:08,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:08,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:08,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:08,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:08,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:08,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:09,080 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 23 [2021-05-02 14:40:09,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:09,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:09,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:09,542 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:40:09,542 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:09,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947699546] [2021-05-02 14:40:09,542 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:09,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622113215] [2021-05-02 14:40:09,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622113215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:09,542 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:09,542 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:40:09,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168083155] [2021-05-02 14:40:09,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:40:09,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:09,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:40:09,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:40:09,544 INFO L87 Difference]: Start difference. First operand 71 states and 80 transitions. Second operand has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:40:09,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:09,875 INFO L93 Difference]: Finished difference Result 100 states and 113 transitions. [2021-05-02 14:40:09,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:40:09,876 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 14:40:09,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:09,877 INFO L225 Difference]: With dead ends: 100 [2021-05-02 14:40:09,877 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 14:40:09,877 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 408.3ms TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:40:09,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 14:40:09,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 14:40:09,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.162162162162162) internal successors, (43), 38 states have internal predecessors, (43), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:40:09,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2021-05-02 14:40:09,881 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 47 [2021-05-02 14:40:09,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:09,881 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2021-05-02 14:40:09,881 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:40:09,881 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2021-05-02 14:40:09,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 14:40:09,882 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:09,882 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:10,088 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:10,088 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:10,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:10,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1045745238, now seen corresponding path program 3 times [2021-05-02 14:40:10,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:10,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304422569] [2021-05-02 14:40:10,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:10,102 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:10,103 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [242116815] [2021-05-02 14:40:10,103 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:40:10,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:40:10,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:40:10,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:40:10,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:40:10,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:40:10,400 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:40:10,400 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:40:10,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304422569] [2021-05-02 14:40:10,400 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:40:10,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242116815] [2021-05-02 14:40:10,400 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242116815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:40:10,400 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:40:10,400 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:40:10,400 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077337605] [2021-05-02 14:40:10,401 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:40:10,401 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:40:10,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:40:10,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:40:10,402 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:40:10,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:40:10,470 INFO L93 Difference]: Finished difference Result 101 states and 113 transitions. [2021-05-02 14:40:10,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:40:10,471 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 50 [2021-05-02 14:40:10,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:40:10,473 INFO L225 Difference]: With dead ends: 101 [2021-05-02 14:40:10,474 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 14:40:10,474 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 49.8ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:40:10,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 14:40:10,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 74. [2021-05-02 14:40:10,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 56 states have (on average 1.1607142857142858) internal successors, (65), 57 states have internal predecessors, (65), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:40:10,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 83 transitions. [2021-05-02 14:40:10,480 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 83 transitions. Word has length 50 [2021-05-02 14:40:10,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:40:10,481 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 83 transitions. [2021-05-02 14:40:10,481 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:40:10,481 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 83 transitions. [2021-05-02 14:40:10,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 14:40:10,481 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:40:10,481 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:40:10,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 14:40:10,685 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:40:10,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:40:10,686 INFO L82 PathProgramCache]: Analyzing trace with hash 1047532698, now seen corresponding path program 3 times [2021-05-02 14:40:10,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:40:10,686 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023302977] [2021-05-02 14:40:10,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:40:10,709 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:40:10,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [908519778] [2021-05-02 14:40:10,709 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true