/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/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops/sum01-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:09:39,813 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:09:39,814 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:09:39,842 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 11:09:39,842 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 11:09:39,845 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 11:09:39,848 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 11:09:39,855 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 11:09:39,857 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 11:09:39,863 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 11:09:39,864 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 11:09:39,865 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 11:09:39,866 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:09:39,868 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:09:39,870 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:09:39,871 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:09:39,874 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:09:39,875 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:09:39,878 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:09:39,882 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:09:39,883 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:09:39,884 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:09:39,885 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:09:39,886 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:09:39,888 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-06 11:09:39,888 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-06 11:09:39,888 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-06 11:09:39,889 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-06 11:09:39,889 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-06 11:09:39,890 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-06 11:09:39,890 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-06 11:09:39,915 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-06 11:09:39,916 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-06 11:09:39,916 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-06 11:09:39,917 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-06 11:09:39,917 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-06 11:09:39,918 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-06 11:09:39,918 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-06 11:09:39,918 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:09:39,919 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:09:39,920 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:09:39,920 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:09:39,932 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:09:39,933 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:09:39,936 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:09:39,936 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:09:39,936 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:09:39,936 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:09:39,937 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:09:39,937 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:09:39,937 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:09:39,937 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:09:39,938 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:09:39,938 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:09:39,939 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:09:39,939 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:09:39,939 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:09:39,939 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:09:39,939 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:09:39,939 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:09:39,939 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:09:39,940 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:09:39,940 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:09:39,940 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:09:39,940 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:09:39,940 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:09:40,272 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:09:40,295 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:09:40,297 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:09:40,298 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:09:40,299 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:09:40,300 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01-1.i [2021-05-06 11:09:40,358 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20a5a1620/5f4fbb137e214e028aa06851a76db2a8/FLAG1a78c9455 [2021-05-06 11:09:40,764 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:09:40,764 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i [2021-05-06 11:09:40,769 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20a5a1620/5f4fbb137e214e028aa06851a76db2a8/FLAG1a78c9455 [2021-05-06 11:09:40,788 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20a5a1620/5f4fbb137e214e028aa06851a76db2a8 [2021-05-06 11:09:40,790 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:09:40,792 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:09:40,795 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:40,796 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:09:40,799 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:09:40,799 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:40" (1/1) ... [2021-05-06 11:09:40,800 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30f0e045 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:40, skipping insertion in model container [2021-05-06 11:09:40,800 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:40" (1/1) ... [2021-05-06 11:09:40,806 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:09:40,819 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:09:40,961 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i[808,821] [2021-05-06 11:09:40,975 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:40,982 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:09:40,994 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i[808,821] [2021-05-06 11:09:40,997 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:41,011 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:09:41,012 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:41 WrapperNode [2021-05-06 11:09:41,012 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:41,013 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:09:41,013 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:09:41,014 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:09:41,023 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:41" (1/1) ... [2021-05-06 11:09:41,026 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:41" (1/1) ... [2021-05-06 11:09:41,033 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:41" (1/1) ... [2021-05-06 11:09:41,034 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:41" (1/1) ... [2021-05-06 11:09:41,045 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:41" (1/1) ... [2021-05-06 11:09:41,049 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:41" (1/1) ... [2021-05-06 11:09:41,051 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:41" (1/1) ... [2021-05-06 11:09:41,054 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:09:41,056 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:09:41,056 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:09:41,057 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:09:41,058 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:41" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:09:41,174 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:09:41,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:09:41,175 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:09:41,176 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:09:41,176 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:09:41,176 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:09:41,176 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:09:41,176 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-06 11:09:41,176 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-06 11:09:41,177 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:09:41,177 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:09:41,177 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:09:41,177 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-06 11:09:41,177 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:09:41,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:09:41,178 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:09:41,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:09:41,178 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:09:41,179 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:09:41,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:09:41,423 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:09:41,423 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:09:41,424 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:41 BoogieIcfgContainer [2021-05-06 11:09:41,424 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:09:41,426 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:09:41,426 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:09:41,438 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:09:41,438 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:09:40" (1/3) ... [2021-05-06 11:09:41,439 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@364e88ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:41, skipping insertion in model container [2021-05-06 11:09:41,439 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:41" (2/3) ... [2021-05-06 11:09:41,440 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@364e88ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:41, skipping insertion in model container [2021-05-06 11:09:41,440 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:41" (3/3) ... [2021-05-06 11:09:41,441 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01-1.i [2021-05-06 11:09:41,445 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:09:41,449 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:09:41,480 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:09:41,515 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:09:41,515 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:09:41,515 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:09:41,515 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:09:41,515 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:09:41,515 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:09:41,515 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:09:41,515 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:09:41,528 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:41,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:09:41,539 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:41,540 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:41,540 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:41,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:41,549 INFO L82 PathProgramCache]: Analyzing trace with hash 1466806487, now seen corresponding path program 1 times [2021-05-06 11:09:41,556 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:41,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312499500] [2021-05-06 11:09:41,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:41,634 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:41,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:41,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:41,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:41,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:41,825 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:41,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312499500] [2021-05-06 11:09:41,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [312499500] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:41,828 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:41,828 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:09:41,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149962953] [2021-05-06 11:09:41,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:09:41,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:41,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:09:41,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:09:41,845 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:41,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:41,899 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-06 11:09:41,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:09:41,900 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:09:41,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:41,905 INFO L225 Difference]: With dead ends: 31 [2021-05-06 11:09:41,905 INFO L226 Difference]: Without dead ends: 14 [2021-05-06 11:09:41,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:09:41,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-06 11:09:41,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-06 11:09:41,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:41,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-06 11:09:41,948 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-06 11:09:41,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:41,948 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-06 11:09:41,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:41,949 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-06 11:09:41,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:09:41,950 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:41,950 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:41,950 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:09:41,950 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:41,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:41,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1456647756, now seen corresponding path program 1 times [2021-05-06 11:09:41,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:41,952 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467610068] [2021-05-06 11:09:41,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:41,959 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:41,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:42,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:42,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:42,096 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:42,096 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:42,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467610068] [2021-05-06 11:09:42,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [467610068] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:42,097 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:42,097 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:09:42,097 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297911174] [2021-05-06 11:09:42,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:09:42,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:42,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:09:42,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:42,099 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:42,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:42,323 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-06 11:09:42,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:09:42,323 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:09:42,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:42,325 INFO L225 Difference]: With dead ends: 22 [2021-05-06 11:09:42,325 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 11:09:42,326 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 185.8ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:42,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 11:09:42,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 11:09:42,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:42,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-06 11:09:42,345 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-06 11:09:42,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:42,345 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-06 11:09:42,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:42,345 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-06 11:09:42,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:09:42,346 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:42,346 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:42,346 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:09:42,346 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:42,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:42,347 INFO L82 PathProgramCache]: Analyzing trace with hash 193151625, now seen corresponding path program 1 times [2021-05-06 11:09:42,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:42,347 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1760615171] [2021-05-06 11:09:42,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:42,393 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:42,419 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:42,437 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:42,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:42,470 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:42,521 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:42,543 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:42,547 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:42,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:42,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:42,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:42,704 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:42,875 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:42,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1760615171] [2021-05-06 11:09:42,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1760615171] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:42,875 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:42,875 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:09:42,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494759195] [2021-05-06 11:09:42,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:09:42,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:42,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:09:42,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:09:42,877 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:43,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:43,401 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2021-05-06 11:09:43,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:09:43,402 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 11:09:43,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:43,403 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:09:43,403 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 11:09:43,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 609.9ms TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:43,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 11:09:43,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-06 11:09:43,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:43,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-06 11:09:43,413 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2021-05-06 11:09:43,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:43,414 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-06 11:09:43,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:43,414 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-06 11:09:43,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:09:43,415 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:43,415 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:43,415 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:09:43,415 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:43,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:43,416 INFO L82 PathProgramCache]: Analyzing trace with hash -2046664786, now seen corresponding path program 1 times [2021-05-06 11:09:43,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:43,416 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1258626717] [2021-05-06 11:09:43,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:43,448 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:43,478 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:43,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:43,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:43,522 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:43,544 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:43,561 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:43,566 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:43,579 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:43,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:43,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:43,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:43,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:43,631 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:43,650 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:43,663 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:43,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:43,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:43,686 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:43,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:43,733 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:43,750 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:43,753 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:43,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:43,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:43,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:43,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:43,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:43,955 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:43,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1258626717] [2021-05-06 11:09:43,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1258626717] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:43,956 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:43,956 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:09:43,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2515261] [2021-05-06 11:09:43,957 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:09:43,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:43,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:09:43,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:09:43,957 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:44,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:44,137 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-05-06 11:09:44,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:09:44,138 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 11:09:44,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:44,140 INFO L225 Difference]: With dead ends: 30 [2021-05-06 11:09:44,140 INFO L226 Difference]: Without dead ends: 22 [2021-05-06 11:09:44,141 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 232.8ms TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:44,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-06 11:09:44,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-06 11:09:44,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:44,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-06 11:09:44,150 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2021-05-06 11:09:44,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:44,151 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-06 11:09:44,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:44,151 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-06 11:09:44,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 11:09:44,152 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:44,152 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:44,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:09:44,152 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:44,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:44,153 INFO L82 PathProgramCache]: Analyzing trace with hash -1412427221, now seen corresponding path program 2 times [2021-05-06 11:09:44,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:44,155 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763069868] [2021-05-06 11:09:44,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:44,172 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:44,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:44,177 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:44,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:44,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:44,237 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:44,254 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:44,257 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:44,267 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:44,285 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:44,289 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:44,300 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:44,303 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:44,314 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:44,329 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:44,338 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:44,356 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:44,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:44,376 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:44,385 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:44,402 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:44,418 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:44,423 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:44,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:44,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:44,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:44,524 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:44,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:44,660 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:44,660 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763069868] [2021-05-06 11:09:44,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1763069868] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:44,660 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:44,661 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:09:44,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878446244] [2021-05-06 11:09:44,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:09:44,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:44,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:09:44,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:09:44,662 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:44,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:44,947 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-05-06 11:09:44,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:09:44,949 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-06 11:09:44,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:44,950 INFO L225 Difference]: With dead ends: 33 [2021-05-06 11:09:44,950 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 11:09:44,951 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 348.3ms TimeCoverageRelationStatistics Valid=89, Invalid=417, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:09:44,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 11:09:44,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-06 11:09:44,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:44,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-06 11:09:44,962 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2021-05-06 11:09:44,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:44,962 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-06 11:09:44,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:44,962 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-06 11:09:44,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:09:44,963 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:44,963 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:44,963 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:09:44,963 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:44,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:44,963 INFO L82 PathProgramCache]: Analyzing trace with hash -402263410, now seen corresponding path program 3 times [2021-05-06 11:09:44,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:44,964 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953284939] [2021-05-06 11:09:44,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:44,975 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:44,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:44,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:45,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:45,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:45,038 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:45,055 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:45,059 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:45,064 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:45,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:45,068 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:45,084 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:45,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:45,110 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:45,123 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:45,132 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:45,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:45,152 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:45,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:45,179 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:45,194 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:45,210 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:45,212 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:45,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:45,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:45,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:45,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:45,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:45,491 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:45,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953284939] [2021-05-06 11:09:45,491 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [953284939] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:45,491 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:45,491 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:09:45,491 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630949062] [2021-05-06 11:09:45,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:09:45,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:45,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:09:45,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:09:45,505 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:45,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:45,939 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2021-05-06 11:09:45,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:09:45,939 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-06 11:09:45,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:45,940 INFO L225 Difference]: With dead ends: 36 [2021-05-06 11:09:45,940 INFO L226 Difference]: Without dead ends: 28 [2021-05-06 11:09:45,941 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 486.1ms TimeCoverageRelationStatistics Valid=116, Invalid=696, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:09:45,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-06 11:09:45,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-06 11:09:45,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:45,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-06 11:09:45,947 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-06 11:09:45,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:45,947 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-06 11:09:45,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:45,947 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-06 11:09:45,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 11:09:45,948 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:45,948 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:45,948 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 11:09:45,948 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:45,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:45,949 INFO L82 PathProgramCache]: Analyzing trace with hash -1448012981, now seen corresponding path program 4 times [2021-05-06 11:09:45,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:45,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617188979] [2021-05-06 11:09:45,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:45,960 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:45,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:45,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:45,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:45,985 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:46,016 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:46,034 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:46,039 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:46,045 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:46,046 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:46,052 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:46,063 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:46,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:46,085 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:46,099 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:46,119 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:46,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:46,124 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:46,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:46,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:46,178 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:46,195 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:46,196 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:46,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:46,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:46,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:46,343 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:46,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:46,622 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:46,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617188979] [2021-05-06 11:09:46,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [617188979] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:46,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:46,623 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:09:46,623 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261982119] [2021-05-06 11:09:46,623 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:09:46,623 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:46,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:09:46,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:46,624 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:47,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:47,157 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-05-06 11:09:47,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:09:47,158 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-06 11:09:47,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:47,160 INFO L225 Difference]: With dead ends: 39 [2021-05-06 11:09:47,160 INFO L226 Difference]: Without dead ends: 31 [2021-05-06 11:09:47,164 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 666.1ms TimeCoverageRelationStatistics Valid=143, Invalid=1047, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:09:47,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-06 11:09:47,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-06 11:09:47,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:47,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2021-05-06 11:09:47,172 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 26 [2021-05-06 11:09:47,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:47,172 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2021-05-06 11:09:47,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:47,173 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2021-05-06 11:09:47,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:09:47,173 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:47,173 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:47,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:09:47,174 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:47,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:47,174 INFO L82 PathProgramCache]: Analyzing trace with hash 319282542, now seen corresponding path program 5 times [2021-05-06 11:09:47,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:47,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892337866] [2021-05-06 11:09:47,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:47,186 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:47,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:47,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:47,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:47,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:47,239 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:47,255 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:47,256 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:47,260 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:47,272 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:47,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:47,285 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:47,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:47,296 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:47,309 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:47,314 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:47,316 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:47,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:47,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:47,341 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:47,364 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:47,382 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:47,387 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:47,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:47,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:47,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:47,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:47,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:47,842 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:47,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892337866] [2021-05-06 11:09:47,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [892337866] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:47,843 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:47,843 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:09:47,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804655060] [2021-05-06 11:09:47,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:09:47,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:47,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:09:47,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=481, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:09:47,844 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:48,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:48,569 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-06 11:09:48,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:09:48,569 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-06 11:09:48,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:48,570 INFO L225 Difference]: With dead ends: 42 [2021-05-06 11:09:48,570 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 11:09:48,571 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 787.3ms TimeCoverageRelationStatistics Valid=170, Invalid=1470, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:09:48,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 11:09:48,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-06 11:09:48,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:48,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-06 11:09:48,576 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2021-05-06 11:09:48,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:48,576 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-06 11:09:48,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:48,577 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-06 11:09:48,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-06 11:09:48,577 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:48,577 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:48,578 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:09:48,578 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:48,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:48,578 INFO L82 PathProgramCache]: Analyzing trace with hash 2111093867, now seen corresponding path program 6 times [2021-05-06 11:09:48,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:48,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [427573912] [2021-05-06 11:09:48,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:48,598 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:48,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:48,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:48,630 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:48,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:48,649 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:48,666 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:48,667 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:48,671 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:48,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:48,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:48,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:48,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:48,728 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:48,739 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:48,749 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:48,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:48,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:48,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:48,787 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:48,800 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:48,816 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:48,817 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:48,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:48,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:48,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:48,887 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:48,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:49,251 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:49,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [427573912] [2021-05-06 11:09:49,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [427573912] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:49,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:49,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:09:49,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194364762] [2021-05-06 11:09:49,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:09:49,252 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:49,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:09:49,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=621, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:09:49,255 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 26 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:49,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:49,970 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2021-05-06 11:09:49,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:09:49,971 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-06 11:09:49,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:49,971 INFO L225 Difference]: With dead ends: 45 [2021-05-06 11:09:49,971 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 11:09:49,972 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 839.4ms TimeCoverageRelationStatistics Valid=197, Invalid=1965, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:09:49,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 11:09:49,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-06 11:09:49,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:49,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-05-06 11:09:49,978 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 32 [2021-05-06 11:09:49,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:49,978 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-05-06 11:09:49,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:49,978 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-05-06 11:09:49,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 11:09:49,979 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:49,979 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:49,979 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-06 11:09:49,979 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:49,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:49,980 INFO L82 PathProgramCache]: Analyzing trace with hash -186245042, now seen corresponding path program 7 times [2021-05-06 11:09:49,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:49,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195775334] [2021-05-06 11:09:49,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:49,992 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:49,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:50,001 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:50,018 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:50,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:50,047 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:50,063 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:50,065 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:50,078 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:50,090 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:50,092 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:50,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:50,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:50,115 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:50,128 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:50,136 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:50,151 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:50,160 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:50,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:50,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:50,189 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:50,205 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:50,206 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:50,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:50,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:50,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:50,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:50,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:50,768 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:50,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195775334] [2021-05-06 11:09:50,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1195775334] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:50,769 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:50,769 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:09:50,769 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47475135] [2021-05-06 11:09:50,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:09:50,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:50,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:09:50,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=779, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:09:50,770 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:51,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:51,657 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2021-05-06 11:09:51,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:09:51,658 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-06 11:09:51,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:51,658 INFO L225 Difference]: With dead ends: 48 [2021-05-06 11:09:51,658 INFO L226 Difference]: Without dead ends: 40 [2021-05-06 11:09:51,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 1054.7ms TimeCoverageRelationStatistics Valid=224, Invalid=2532, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:09:51,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-06 11:09:51,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-06 11:09:51,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:51,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-06 11:09:51,666 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2021-05-06 11:09:51,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:51,666 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-06 11:09:51,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:51,666 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-06 11:09:51,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 11:09:51,667 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:51,667 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:51,667 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 11:09:51,667 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:51,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:51,667 INFO L82 PathProgramCache]: Analyzing trace with hash 94178699, now seen corresponding path program 8 times [2021-05-06 11:09:51,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:51,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623585221] [2021-05-06 11:09:51,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:51,676 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:51,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:51,693 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:51,714 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:51,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:51,731 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:51,747 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:51,748 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:51,752 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:51,763 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:51,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:51,775 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:51,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:51,786 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:51,799 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:51,806 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:51,807 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:51,809 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:51,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:51,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:51,850 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:51,864 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:51,865 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:51,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:51,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:51,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:51,949 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:51,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:52,449 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:52,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623585221] [2021-05-06 11:09:52,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1623585221] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:52,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:52,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:09:52,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310175929] [2021-05-06 11:09:52,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:09:52,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:52,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:09:52,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=955, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:09:52,451 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 32 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:53,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:53,427 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-05-06 11:09:53,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:09:53,429 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-06 11:09:53,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:53,430 INFO L225 Difference]: With dead ends: 51 [2021-05-06 11:09:53,430 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 11:09:53,431 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 1179.3ms TimeCoverageRelationStatistics Valid=251, Invalid=3171, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:09:53,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 11:09:53,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-06 11:09:53,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:53,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-06 11:09:53,436 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 38 [2021-05-06 11:09:53,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:53,436 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-06 11:09:53,436 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:53,436 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-06 11:09:53,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:09:53,437 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:53,437 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:53,437 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:09:53,437 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:53,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:53,437 INFO L82 PathProgramCache]: Analyzing trace with hash 486456110, now seen corresponding path program 9 times [2021-05-06 11:09:53,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:53,438 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [663039466] [2021-05-06 11:09:53,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:53,455 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:53,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:53,458 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:53,472 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:53,476 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:53,499 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:53,512 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:53,513 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:09:53,521 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:53,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:53,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:53,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:53,546 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:53,554 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:53,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:53,570 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:53,586 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:53,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:53,597 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:53,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:53,611 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:53,624 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:53,625 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:53,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:53,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:53,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:53,698 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:53,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:54,302 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:54,302 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [663039466] [2021-05-06 11:09:54,302 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [663039466] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:54,303 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:54,303 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:09:54,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302060043] [2021-05-06 11:09:54,303 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:09:54,303 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:54,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:09:54,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1219, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:09:54,304 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:55,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:55,576 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2021-05-06 11:09:55,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:09:55,577 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-06 11:09:55,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:55,577 INFO L225 Difference]: With dead ends: 58 [2021-05-06 11:09:55,578 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 11:09:55,579 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 957 ImplicationChecksByTransitivity, 1436.8ms TimeCoverageRelationStatistics Valid=284, Invalid=4138, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:09:55,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 11:09:55,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-06 11:09:55,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:55,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-05-06 11:09:55,585 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 41 [2021-05-06 11:09:55,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:55,586 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-05-06 11:09:55,586 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:55,586 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-05-06 11:09:55,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:09:55,586 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:55,587 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:55,587 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 11:09:55,587 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:55,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:55,587 INFO L82 PathProgramCache]: Analyzing trace with hash -176232215, now seen corresponding path program 10 times [2021-05-06 11:09:55,587 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:55,587 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [901016469] [2021-05-06 11:09:55,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:55,596 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:55,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:55,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:55,628 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:55,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:55,646 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:55,661 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:55,664 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:09:55,674 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:55,676 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:55,692 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:55,696 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:55,703 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:09:55,714 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:55,715 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:55,719 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:55,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:55,731 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:55,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:55,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:55,754 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:55,767 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:55,772 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:55,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:55,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:55,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:55,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:55,821 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:55,834 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:55,836 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:55,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:55,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:55,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:55,921 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:55,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:56,533 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:56,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [901016469] [2021-05-06 11:09:56,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [901016469] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:56,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:56,534 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:09:56,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048938142] [2021-05-06 11:09:56,534 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:09:56,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:56,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:09:56,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1364, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:09:56,535 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 38 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:57,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:57,907 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2021-05-06 11:09:57,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:09:57,907 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-06 11:09:57,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:57,908 INFO L225 Difference]: With dead ends: 58 [2021-05-06 11:09:57,908 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 11:09:57,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1168 ImplicationChecksByTransitivity, 1561.6ms TimeCoverageRelationStatistics Valid=299, Invalid=4671, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:09:57,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 11:09:57,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-06 11:09:57,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:57,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2021-05-06 11:09:57,917 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2021-05-06 11:09:57,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:57,917 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2021-05-06 11:09:57,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:57,918 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2021-05-06 11:09:57,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:09:57,918 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:57,918 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:57,918 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:09:57,919 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:57,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:57,919 INFO L82 PathProgramCache]: Analyzing trace with hash 1640537422, now seen corresponding path program 11 times [2021-05-06 11:09:57,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:57,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1559566135] [2021-05-06 11:09:57,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:57,927 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:09:57,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:57,941 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:57,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:57,954 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:57,966 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:09:57,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:57,993 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:09:58,006 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:58,007 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:58,015 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:09:58,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:09:58,023 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:09:58,037 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:58,037 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:58,040 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:09:58,049 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:58,052 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:58,059 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:58,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:58,074 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:09:58,084 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:58,094 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:09:58,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:58,113 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:09:58,125 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:09:58,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:09:58,146 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:09:58,160 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:09:58,161 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:09:58,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:58,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:58,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:58,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:58,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:09:58,937 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:58,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1559566135] [2021-05-06 11:09:58,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1559566135] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:58,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:58,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 11:09:58,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352945729] [2021-05-06 11:09:58,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 11:09:58,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:58,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 11:09:58,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1517, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:09:58,939 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 38 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:00,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:00,362 INFO L93 Difference]: Finished difference Result 61 states and 65 transitions. [2021-05-06 11:10:00,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:10:00,362 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 38 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-06 11:10:00,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:00,364 INFO L225 Difference]: With dead ends: 61 [2021-05-06 11:10:00,364 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 11:10:00,365 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1389 ImplicationChecksByTransitivity, 1626.9ms TimeCoverageRelationStatistics Valid=314, Invalid=5236, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:10:00,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 11:10:00,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-06 11:10:00,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:00,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2021-05-06 11:10:00,376 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 47 [2021-05-06 11:10:00,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:00,377 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2021-05-06 11:10:00,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 38 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:00,378 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2021-05-06 11:10:00,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:10:00,380 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:00,380 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:00,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:10:00,381 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:00,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:00,381 INFO L82 PathProgramCache]: Analyzing trace with hash -153070903, now seen corresponding path program 12 times [2021-05-06 11:10:00,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:00,381 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957235359] [2021-05-06 11:10:00,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:00,390 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:00,406 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:00,409 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:00,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:00,426 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:00,438 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:00,453 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:00,457 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:00,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:00,468 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:00,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:00,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:00,483 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:00,494 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:00,497 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:00,500 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:00,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:00,504 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:00,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:00,520 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:00,535 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:00,546 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:00,550 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:00,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:00,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:00,581 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:00,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:00,602 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:00,624 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:00,625 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:00,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:00,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:00,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:00,695 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:00,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:01,458 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:01,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957235359] [2021-05-06 11:10:01,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [957235359] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:01,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:01,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:10:01,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63021245] [2021-05-06 11:10:01,459 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:10:01,459 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:01,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:10:01,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1678, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:10:01,460 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 42 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:02,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:02,988 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2021-05-06 11:10:02,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:10:02,989 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-06 11:10:02,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:02,989 INFO L225 Difference]: With dead ends: 64 [2021-05-06 11:10:02,989 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 11:10:02,991 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1620 ImplicationChecksByTransitivity, 1760.8ms TimeCoverageRelationStatistics Valid=329, Invalid=5833, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:10:02,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 11:10:02,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-06 11:10:02,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:02,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-05-06 11:10:02,998 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2021-05-06 11:10:02,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:02,998 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-05-06 11:10:02,999 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:02,999 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-05-06 11:10:02,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 11:10:02,999 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:02,999 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:03,000 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-06 11:10:03,000 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:03,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:03,000 INFO L82 PathProgramCache]: Analyzing trace with hash 149448558, now seen corresponding path program 13 times [2021-05-06 11:10:03,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:03,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [864838053] [2021-05-06 11:10:03,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:03,008 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:03,009 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:03,011 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:03,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:03,027 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:03,048 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:03,061 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:03,069 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:03,079 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:03,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:03,088 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:03,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:03,097 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:03,107 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:03,109 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:03,112 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:03,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:03,115 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:03,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:03,137 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:03,161 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:03,171 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:03,176 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:03,176 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:03,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:03,188 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:03,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:03,214 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:03,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:03,242 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:03,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:03,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:03,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:03,311 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:03,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:04,102 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:04,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [864838053] [2021-05-06 11:10:04,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [864838053] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:04,103 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:04,103 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:10:04,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943034455] [2021-05-06 11:10:04,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:10:04,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:04,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:10:04,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1847, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:10:04,104 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 44 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 42 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:05,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:05,710 INFO L93 Difference]: Finished difference Result 67 states and 71 transitions. [2021-05-06 11:10:05,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 11:10:05,711 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 42 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-06 11:10:05,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:05,711 INFO L225 Difference]: With dead ends: 67 [2021-05-06 11:10:05,711 INFO L226 Difference]: Without dead ends: 59 [2021-05-06 11:10:05,713 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1861 ImplicationChecksByTransitivity, 1850.3ms TimeCoverageRelationStatistics Valid=344, Invalid=6462, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:10:05,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-06 11:10:05,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-06 11:10:05,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:05,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2021-05-06 11:10:05,722 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 53 [2021-05-06 11:10:05,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:05,722 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2021-05-06 11:10:05,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 42 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:05,722 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2021-05-06 11:10:05,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 11:10:05,723 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:05,723 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:05,723 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:10:05,723 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:05,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:05,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1665324201, now seen corresponding path program 14 times [2021-05-06 11:10:05,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:05,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043085438] [2021-05-06 11:10:05,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:05,731 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:05,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:05,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:05,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:05,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:05,769 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:05,783 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:05,787 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:05,788 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:05,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:05,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:05,804 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:05,817 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:05,827 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:05,828 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:05,831 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:05,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:05,842 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:05,852 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:05,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:05,871 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:05,885 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:05,890 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:05,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:05,906 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:05,917 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:05,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:05,931 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:05,946 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:05,947 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:05,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:06,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:06,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:06,025 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:06,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:06,834 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:06,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043085438] [2021-05-06 11:10:06,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2043085438] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:06,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:06,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 11:10:06,835 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200541256] [2021-05-06 11:10:06,835 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 11:10:06,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:06,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 11:10:06,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2024, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:10:06,836 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 46 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 44 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:08,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:08,487 INFO L93 Difference]: Finished difference Result 70 states and 74 transitions. [2021-05-06 11:10:08,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:10:08,488 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 44 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-06 11:10:08,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:08,488 INFO L225 Difference]: With dead ends: 70 [2021-05-06 11:10:08,488 INFO L226 Difference]: Without dead ends: 62 [2021-05-06 11:10:08,490 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2112 ImplicationChecksByTransitivity, 1905.0ms TimeCoverageRelationStatistics Valid=359, Invalid=7123, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 11:10:08,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-06 11:10:08,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-06 11:10:08,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:08,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2021-05-06 11:10:08,497 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 56 [2021-05-06 11:10:08,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:08,497 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2021-05-06 11:10:08,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 44 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:08,497 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2021-05-06 11:10:08,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:10:08,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:08,498 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:08,498 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-06 11:10:08,498 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:08,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:08,499 INFO L82 PathProgramCache]: Analyzing trace with hash -464512626, now seen corresponding path program 15 times [2021-05-06 11:10:08,499 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:08,499 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988441662] [2021-05-06 11:10:08,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:08,506 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:08,518 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:08,520 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:08,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:08,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:08,554 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:08,582 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:08,586 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:08,586 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:08,589 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:08,599 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:08,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:08,619 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:08,630 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:08,630 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:08,632 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:08,633 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:08,634 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:08,645 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:08,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:08,659 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:08,670 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:08,685 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:08,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:08,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:08,702 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:08,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:08,730 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:08,744 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:08,745 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:08,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:08,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:08,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:08,814 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:08,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:09,684 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:09,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988441662] [2021-05-06 11:10:09,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [988441662] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:09,684 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:09,684 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 11:10:09,684 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329638430] [2021-05-06 11:10:09,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 11:10:09,684 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:09,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 11:10:09,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2209, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:10:09,685 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 48 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 46 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:11,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:11,504 INFO L93 Difference]: Finished difference Result 73 states and 77 transitions. [2021-05-06 11:10:11,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:10:11,505 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 46 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-06 11:10:11,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:11,505 INFO L225 Difference]: With dead ends: 73 [2021-05-06 11:10:11,505 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 11:10:11,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2373 ImplicationChecksByTransitivity, 2052.4ms TimeCoverageRelationStatistics Valid=374, Invalid=7816, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 11:10:11,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 11:10:11,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-06 11:10:11,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:11,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-05-06 11:10:11,516 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 59 [2021-05-06 11:10:11,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:11,516 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-05-06 11:10:11,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 46 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:11,517 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-05-06 11:10:11,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:10:11,517 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:11,517 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:11,517 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-06 11:10:11,517 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:11,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:11,518 INFO L82 PathProgramCache]: Analyzing trace with hash -881561975, now seen corresponding path program 16 times [2021-05-06 11:10:11,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:11,518 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790908159] [2021-05-06 11:10:11,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:11,526 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:11,540 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:11,541 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:11,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:11,554 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:11,578 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:11,596 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:11,600 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:11,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:11,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:11,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:11,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:11,635 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:11,645 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:11,646 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:11,649 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:11,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:11,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:11,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:11,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:11,681 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:11,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:11,695 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:11,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:11,699 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:11,709 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:11,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:11,734 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:11,747 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:11,748 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:11,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:11,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:11,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:11,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:11,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:12,810 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:12,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790908159] [2021-05-06 11:10:12,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [790908159] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:12,810 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:12,810 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 11:10:12,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147279942] [2021-05-06 11:10:12,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 11:10:12,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:12,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 11:10:12,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=2402, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:10:12,811 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 48 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:14,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:14,677 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2021-05-06 11:10:14,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:10:14,678 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 48 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-06 11:10:14,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:14,679 INFO L225 Difference]: With dead ends: 76 [2021-05-06 11:10:14,679 INFO L226 Difference]: Without dead ends: 68 [2021-05-06 11:10:14,680 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2644 ImplicationChecksByTransitivity, 2188.1ms TimeCoverageRelationStatistics Valid=389, Invalid=8541, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:10:14,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-06 11:10:14,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-05-06 11:10:14,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:14,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2021-05-06 11:10:14,687 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 62 [2021-05-06 11:10:14,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:14,687 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2021-05-06 11:10:14,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 48 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:14,687 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2021-05-06 11:10:14,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:10:14,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:14,688 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:14,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:10:14,688 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:14,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:14,688 INFO L82 PathProgramCache]: Analyzing trace with hash 141669294, now seen corresponding path program 17 times [2021-05-06 11:10:14,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:14,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2061643185] [2021-05-06 11:10:14,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:14,706 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:14,722 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:14,749 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:14,762 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:14,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:14,784 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:14,785 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:14,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:14,812 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:14,823 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:14,823 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:14,826 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:14,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,858 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:14,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:14,867 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:14,877 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:14,881 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:14,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:14,913 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:14,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:14,930 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:14,945 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:14,946 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:14,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:15,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:15,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:15,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:15,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:16,062 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:16,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2061643185] [2021-05-06 11:10:16,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2061643185] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:16,062 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:16,062 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 11:10:16,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059903757] [2021-05-06 11:10:16,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 11:10:16,062 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:16,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 11:10:16,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2603, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:10:16,063 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 52 states, 51 states have (on average 1.196078431372549) internal successors, (61), 50 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:18,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:18,140 INFO L93 Difference]: Finished difference Result 79 states and 83 transitions. [2021-05-06 11:10:18,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:10:18,140 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.196078431372549) internal successors, (61), 50 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-06 11:10:18,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:18,141 INFO L225 Difference]: With dead ends: 79 [2021-05-06 11:10:18,141 INFO L226 Difference]: Without dead ends: 71 [2021-05-06 11:10:18,142 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2925 ImplicationChecksByTransitivity, 2350.6ms TimeCoverageRelationStatistics Valid=404, Invalid=9298, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:10:18,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-06 11:10:18,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2021-05-06 11:10:18,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:18,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2021-05-06 11:10:18,148 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 65 [2021-05-06 11:10:18,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:18,148 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2021-05-06 11:10:18,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 51 states have (on average 1.196078431372549) internal successors, (61), 50 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:18,148 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2021-05-06 11:10:18,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:10:18,149 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:18,149 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:18,149 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-06 11:10:18,149 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:18,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:18,149 INFO L82 PathProgramCache]: Analyzing trace with hash 1841504361, now seen corresponding path program 18 times [2021-05-06 11:10:18,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:18,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589281679] [2021-05-06 11:10:18,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:18,167 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:18,180 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,181 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,191 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:18,195 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:18,204 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:18,218 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:18,238 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:18,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,251 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,260 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:18,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:18,270 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:18,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:18,285 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:18,288 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:18,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:18,319 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:18,326 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:18,343 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:18,352 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:18,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,355 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:18,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:18,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:18,396 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:18,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:18,411 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:18,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:18,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:18,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:18,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:18,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:19,633 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:19,633 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589281679] [2021-05-06 11:10:19,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [589281679] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:19,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:19,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:10:19,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130917356] [2021-05-06 11:10:19,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:10:19,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:19,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:10:19,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:10:19,635 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand has 54 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 52 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:21,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:21,713 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2021-05-06 11:10:21,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:10:21,713 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 52 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-05-06 11:10:21,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:21,714 INFO L225 Difference]: With dead ends: 82 [2021-05-06 11:10:21,714 INFO L226 Difference]: Without dead ends: 74 [2021-05-06 11:10:21,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3216 ImplicationChecksByTransitivity, 2450.3ms TimeCoverageRelationStatistics Valid=419, Invalid=10087, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 11:10:21,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-06 11:10:21,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-06 11:10:21,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 68 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:21,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2021-05-06 11:10:21,723 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 68 [2021-05-06 11:10:21,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:21,723 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2021-05-06 11:10:21,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 52 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:21,723 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2021-05-06 11:10:21,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:10:21,724 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:21,724 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:21,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2021-05-06 11:10:21,724 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:21,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:21,724 INFO L82 PathProgramCache]: Analyzing trace with hash -331401778, now seen corresponding path program 19 times [2021-05-06 11:10:21,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:21,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660391985] [2021-05-06 11:10:21,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:21,732 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:21,746 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,749 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:21,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:21,776 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:21,792 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:21,797 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:21,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,809 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:21,811 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:21,826 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:21,836 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:21,837 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:21,839 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:21,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,841 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,852 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:21,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:21,881 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:21,894 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:21,899 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:21,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:21,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:21,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:21,943 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:21,959 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:21,960 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:21,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:22,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:22,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:22,049 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:22,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:23,200 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:23,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660391985] [2021-05-06 11:10:23,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1660391985] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:23,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:23,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-06 11:10:23,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931176646] [2021-05-06 11:10:23,201 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 11:10:23,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:23,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 11:10:23,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=3029, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:10:23,201 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand has 56 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 54 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:25,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:25,415 INFO L93 Difference]: Finished difference Result 85 states and 89 transitions. [2021-05-06 11:10:25,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:10:25,417 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 54 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-06 11:10:25,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:25,418 INFO L225 Difference]: With dead ends: 85 [2021-05-06 11:10:25,418 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 11:10:25,419 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3517 ImplicationChecksByTransitivity, 2539.3ms TimeCoverageRelationStatistics Valid=434, Invalid=10908, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 11:10:25,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 11:10:25,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2021-05-06 11:10:25,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:25,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2021-05-06 11:10:25,428 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 71 [2021-05-06 11:10:25,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:25,428 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2021-05-06 11:10:25,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 54 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:25,428 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2021-05-06 11:10:25,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:10:25,429 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:25,429 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:25,429 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:10:25,429 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:25,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:25,429 INFO L82 PathProgramCache]: Analyzing trace with hash 368896585, now seen corresponding path program 20 times [2021-05-06 11:10:25,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:25,429 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47152174] [2021-05-06 11:10:25,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:25,438 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:25,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,452 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,462 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:25,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:25,475 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:25,488 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:25,491 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:25,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,492 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,504 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:25,506 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:25,521 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:25,531 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:25,532 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:25,534 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:25,543 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:25,553 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:25,565 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:25,578 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:25,581 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:25,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,595 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:25,611 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:25,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:25,630 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:25,650 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:25,651 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:25,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:25,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:25,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:25,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:25,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:27,021 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:27,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47152174] [2021-05-06 11:10:27,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [47152174] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:27,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:27,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-06 11:10:27,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471505882] [2021-05-06 11:10:27,021 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 11:10:27,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:27,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 11:10:27,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=3254, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:10:27,022 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 58 states, 57 states have (on average 1.2280701754385965) internal successors, (70), 56 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:29,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:29,407 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2021-05-06 11:10:29,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:10:29,407 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.2280701754385965) internal successors, (70), 56 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-06 11:10:29,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:29,407 INFO L225 Difference]: With dead ends: 88 [2021-05-06 11:10:29,408 INFO L226 Difference]: Without dead ends: 80 [2021-05-06 11:10:29,408 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3828 ImplicationChecksByTransitivity, 2777.5ms TimeCoverageRelationStatistics Valid=449, Invalid=11761, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 11:10:29,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-06 11:10:29,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-06 11:10:29,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:29,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-05-06 11:10:29,414 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2021-05-06 11:10:29,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:29,415 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-05-06 11:10:29,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 57 states have (on average 1.2280701754385965) internal successors, (70), 56 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:29,415 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-05-06 11:10:29,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:10:29,415 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:29,415 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:29,415 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2021-05-06 11:10:29,415 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:29,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:29,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1993695250, now seen corresponding path program 21 times [2021-05-06 11:10:29,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:29,416 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108360160] [2021-05-06 11:10:29,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:29,423 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:29,424 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:29,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:29,439 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:29,442 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:29,461 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:29,474 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:29,480 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:29,493 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:29,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:29,503 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:29,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:29,511 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:29,522 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:29,522 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:29,524 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:29,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:29,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:29,541 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:29,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:29,549 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:29,560 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:29,564 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:29,576 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:29,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:29,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:29,605 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:29,615 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:29,629 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:29,630 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:29,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:29,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:29,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:29,700 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:29,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:30,982 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:30,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108360160] [2021-05-06 11:10:30,982 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2108360160] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:30,982 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:30,982 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 11:10:30,982 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962610666] [2021-05-06 11:10:30,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 11:10:30,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:30,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 11:10:30,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3487, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:10:30,983 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 60 states, 59 states have (on average 1.2372881355932204) internal successors, (73), 58 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:33,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:33,479 INFO L93 Difference]: Finished difference Result 91 states and 95 transitions. [2021-05-06 11:10:33,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:10:33,479 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 1.2372881355932204) internal successors, (73), 58 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-06 11:10:33,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:33,480 INFO L225 Difference]: With dead ends: 91 [2021-05-06 11:10:33,480 INFO L226 Difference]: Without dead ends: 83 [2021-05-06 11:10:33,480 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4149 ImplicationChecksByTransitivity, 2826.0ms TimeCoverageRelationStatistics Valid=464, Invalid=12646, Unknown=0, NotChecked=0, Total=13110 [2021-05-06 11:10:33,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-06 11:10:33,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-05-06 11:10:33,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:33,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-05-06 11:10:33,488 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2021-05-06 11:10:33,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:33,488 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-05-06 11:10:33,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 59 states have (on average 1.2372881355932204) internal successors, (73), 58 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:33,488 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-05-06 11:10:33,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 11:10:33,488 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:33,488 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 14, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:33,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99 [2021-05-06 11:10:33,489 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:33,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:33,489 INFO L82 PathProgramCache]: Analyzing trace with hash -43004887, now seen corresponding path program 22 times [2021-05-06 11:10:33,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:33,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000977640] [2021-05-06 11:10:33,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:33,503 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:33,504 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:33,522 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:33,545 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:33,559 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:33,562 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:33,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,565 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:33,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:33,592 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:33,602 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:33,603 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:33,605 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:33,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:33,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:33,630 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:33,640 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:33,643 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:33,655 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:33,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:33,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:33,703 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:33,720 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:33,721 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:33,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:33,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:33,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:33,802 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:33,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:35,226 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:35,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000977640] [2021-05-06 11:10:35,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1000977640] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:35,226 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:35,226 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-06 11:10:35,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336155930] [2021-05-06 11:10:35,226 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 11:10:35,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:35,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 11:10:35,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=3728, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:10:35,227 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 62 states, 61 states have (on average 1.2459016393442623) internal successors, (76), 60 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:37,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:37,840 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2021-05-06 11:10:37,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 11:10:37,840 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 1.2459016393442623) internal successors, (76), 60 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-06 11:10:37,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:37,841 INFO L225 Difference]: With dead ends: 94 [2021-05-06 11:10:37,841 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 11:10:37,843 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4480 ImplicationChecksByTransitivity, 3026.9ms TimeCoverageRelationStatistics Valid=479, Invalid=13563, Unknown=0, NotChecked=0, Total=14042 [2021-05-06 11:10:37,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 11:10:37,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-06 11:10:37,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.025) internal successors, (82), 80 states have internal predecessors, (82), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:37,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2021-05-06 11:10:37,851 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 80 [2021-05-06 11:10:37,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:37,851 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2021-05-06 11:10:37,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 61 states have (on average 1.2459016393442623) internal successors, (76), 60 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:37,851 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2021-05-06 11:10:37,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:10:37,852 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:37,852 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:37,852 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2021-05-06 11:10:37,852 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:37,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:37,852 INFO L82 PathProgramCache]: Analyzing trace with hash 2066084366, now seen corresponding path program 23 times [2021-05-06 11:10:37,852 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:37,852 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445394017] [2021-05-06 11:10:37,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:37,860 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:37,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,888 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:37,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:37,903 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:37,918 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:37,923 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:37,933 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,935 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,943 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:37,945 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:37,951 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:37,963 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:37,964 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:37,966 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:37,977 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,979 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:37,987 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:37,989 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:37,996 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:38,008 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:38,012 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:38,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:38,014 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:38,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:38,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:38,051 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:38,067 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:38,068 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:38,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:38,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:38,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:38,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:38,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:39,606 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:39,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445394017] [2021-05-06 11:10:39,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [445394017] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:39,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:39,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-06 11:10:39,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124097434] [2021-05-06 11:10:39,606 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 11:10:39,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:39,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 11:10:39,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=3977, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:10:39,607 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand has 64 states, 63 states have (on average 1.253968253968254) internal successors, (79), 62 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:42,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:42,340 INFO L93 Difference]: Finished difference Result 97 states and 101 transitions. [2021-05-06 11:10:42,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:10:42,341 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 1.253968253968254) internal successors, (79), 62 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 11:10:42,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:42,342 INFO L225 Difference]: With dead ends: 97 [2021-05-06 11:10:42,342 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 11:10:42,343 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4821 ImplicationChecksByTransitivity, 3128.0ms TimeCoverageRelationStatistics Valid=494, Invalid=14512, Unknown=0, NotChecked=0, Total=15006 [2021-05-06 11:10:42,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 11:10:42,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-06 11:10:42,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:42,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2021-05-06 11:10:42,351 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 83 [2021-05-06 11:10:42,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:42,352 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2021-05-06 11:10:42,352 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 63 states have (on average 1.253968253968254) internal successors, (79), 62 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:42,352 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2021-05-06 11:10:42,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 11:10:42,352 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:42,352 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 16, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:42,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109 [2021-05-06 11:10:42,352 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:42,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:42,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1427519991, now seen corresponding path program 24 times [2021-05-06 11:10:42,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:42,353 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932067210] [2021-05-06 11:10:42,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:42,360 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:42,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,362 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,372 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:42,375 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:42,396 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:42,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:42,425 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:42,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,437 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:42,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:42,455 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:42,467 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:42,468 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:42,471 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:42,471 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,480 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:42,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:42,497 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:42,509 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:42,513 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:42,527 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:42,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:42,546 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:42,564 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:42,580 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:42,581 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:42,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:42,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:42,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:42,648 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:42,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:44,186 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:44,187 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932067210] [2021-05-06 11:10:44,187 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1932067210] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:44,187 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:44,187 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-06 11:10:44,187 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403903458] [2021-05-06 11:10:44,187 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-06 11:10:44,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:44,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-06 11:10:44,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=4234, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:10:44,188 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 66 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 64 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:47,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:47,103 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2021-05-06 11:10:47,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:10:47,103 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 64 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-06 11:10:47,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:47,104 INFO L225 Difference]: With dead ends: 100 [2021-05-06 11:10:47,104 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 11:10:47,105 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5172 ImplicationChecksByTransitivity, 3296.6ms TimeCoverageRelationStatistics Valid=509, Invalid=15493, Unknown=0, NotChecked=0, Total=16002 [2021-05-06 11:10:47,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 11:10:47,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-06 11:10:47,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:47,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2021-05-06 11:10:47,113 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 86 [2021-05-06 11:10:47,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:47,113 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2021-05-06 11:10:47,113 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 64 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:47,113 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2021-05-06 11:10:47,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 11:10:47,113 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:47,113 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 17, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:47,113 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable114 [2021-05-06 11:10:47,113 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:47,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:47,114 INFO L82 PathProgramCache]: Analyzing trace with hash 547564590, now seen corresponding path program 25 times [2021-05-06 11:10:47,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:47,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146380208] [2021-05-06 11:10:47,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:47,121 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:47,133 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,156 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:47,161 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:47,173 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:47,192 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:47,195 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:47,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,218 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:47,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:47,227 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:47,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:47,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:47,243 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:47,254 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:47,267 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:47,274 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:47,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:47,290 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:47,304 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:47,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:47,321 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:47,333 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:47,349 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:47,350 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:47,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:47,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:47,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:47,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:47,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:49,133 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:49,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146380208] [2021-05-06 11:10:49,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1146380208] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:49,134 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:49,134 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-06 11:10:49,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52703810] [2021-05-06 11:10:49,134 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-06 11:10:49,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:49,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-06 11:10:49,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=4499, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:10:49,135 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 68 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 66 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:52,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:52,222 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2021-05-06 11:10:52,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:10:52,222 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 66 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-06 11:10:52,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:52,223 INFO L225 Difference]: With dead ends: 103 [2021-05-06 11:10:52,223 INFO L226 Difference]: Without dead ends: 95 [2021-05-06 11:10:52,223 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5533 ImplicationChecksByTransitivity, 3537.7ms TimeCoverageRelationStatistics Valid=524, Invalid=16506, Unknown=0, NotChecked=0, Total=17030 [2021-05-06 11:10:52,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-06 11:10:52,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-05-06 11:10:52,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0224719101123596) internal successors, (91), 89 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:52,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-05-06 11:10:52,234 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 89 [2021-05-06 11:10:52,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:52,234 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-05-06 11:10:52,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 66 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:52,235 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-05-06 11:10:52,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-06 11:10:52,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:52,235 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:52,235 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2021-05-06 11:10:52,235 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:52,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:52,236 INFO L82 PathProgramCache]: Analyzing trace with hash -759638039, now seen corresponding path program 26 times [2021-05-06 11:10:52,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:52,236 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261487868] [2021-05-06 11:10:52,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:52,244 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:52,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,258 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,267 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:52,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:52,280 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:52,294 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:52,296 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:52,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,328 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:52,330 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:52,336 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:52,346 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:52,347 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:52,351 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:52,352 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:52,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:52,374 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:52,384 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:52,392 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:52,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,395 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:52,407 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:52,411 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:52,431 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:52,444 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:52,447 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:52,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:52,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:52,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:52,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:52,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:54,287 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:54,287 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261487868] [2021-05-06 11:10:54,287 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [261487868] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:54,287 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:54,287 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-06 11:10:54,287 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137410363] [2021-05-06 11:10:54,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-06 11:10:54,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:54,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-06 11:10:54,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=4772, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:10:54,288 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 70 states, 69 states have (on average 1.2753623188405796) internal successors, (88), 68 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:57,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:57,494 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2021-05-06 11:10:57,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 11:10:57,494 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 1.2753623188405796) internal successors, (88), 68 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-05-06 11:10:57,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:57,495 INFO L225 Difference]: With dead ends: 106 [2021-05-06 11:10:57,495 INFO L226 Difference]: Without dead ends: 98 [2021-05-06 11:10:57,496 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5904 ImplicationChecksByTransitivity, 3685.8ms TimeCoverageRelationStatistics Valid=539, Invalid=17551, Unknown=0, NotChecked=0, Total=18090 [2021-05-06 11:10:57,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-06 11:10:57,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-06 11:10:57,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0217391304347827) internal successors, (94), 92 states have internal predecessors, (94), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:57,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2021-05-06 11:10:57,505 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 92 [2021-05-06 11:10:57,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:57,505 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2021-05-06 11:10:57,505 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 69 states have (on average 1.2753623188405796) internal successors, (88), 68 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:10:57,505 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2021-05-06 11:10:57,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:10:57,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:57,505 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 19, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:57,505 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable124 [2021-05-06 11:10:57,505 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:57,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:57,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1164685746, now seen corresponding path program 27 times [2021-05-06 11:10:57,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:57,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639778193] [2021-05-06 11:10:57,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:57,513 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:10:57,525 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:57,526 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:57,535 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:57,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:57,549 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:10:57,562 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:57,565 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:10:57,565 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:57,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:57,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:10:57,575 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:10:57,588 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:10:57,598 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:57,599 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:57,601 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:10:57,610 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:57,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:57,619 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:57,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:57,627 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:10:57,637 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:57,648 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:10:57,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:57,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:10:57,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:10:57,665 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:10:57,684 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:10:57,698 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:10:57,699 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:10:57,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:57,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:57,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:57,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:10:57,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:10:59,537 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:59,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639778193] [2021-05-06 11:10:59,537 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1639778193] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:59,537 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:59,537 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-06 11:10:59,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985556003] [2021-05-06 11:10:59,538 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-06 11:10:59,538 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:59,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-06 11:10:59,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=5053, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:10:59,539 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand has 72 states, 71 states have (on average 1.2816901408450705) internal successors, (91), 70 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:02,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:02,958 INFO L93 Difference]: Finished difference Result 109 states and 113 transitions. [2021-05-06 11:11:02,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 11:11:02,958 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 71 states have (on average 1.2816901408450705) internal successors, (91), 70 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-06 11:11:02,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:02,959 INFO L225 Difference]: With dead ends: 109 [2021-05-06 11:11:02,959 INFO L226 Difference]: Without dead ends: 101 [2021-05-06 11:11:02,960 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6285 ImplicationChecksByTransitivity, 3773.4ms TimeCoverageRelationStatistics Valid=554, Invalid=18628, Unknown=0, NotChecked=0, Total=19182 [2021-05-06 11:11:02,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-06 11:11:02,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2021-05-06 11:11:02,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:02,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2021-05-06 11:11:02,969 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 95 [2021-05-06 11:11:02,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:02,970 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2021-05-06 11:11:02,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 71 states have (on average 1.2816901408450705) internal successors, (91), 70 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:02,970 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2021-05-06 11:11:02,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 11:11:02,970 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:02,971 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 20, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:02,971 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable129 [2021-05-06 11:11:02,971 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:02,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:02,971 INFO L82 PathProgramCache]: Analyzing trace with hash 917176777, now seen corresponding path program 28 times [2021-05-06 11:11:02,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:02,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119713868] [2021-05-06 11:11:02,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:02,985 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:11:02,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:02,987 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:02,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:03,003 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:03,023 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:11:03,037 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:03,039 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:11:03,048 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:03,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:03,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:03,077 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:03,084 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:11:03,102 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:03,103 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:03,106 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:11:03,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:03,119 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:03,128 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:03,130 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:03,138 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:11:03,152 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:03,156 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:11:03,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:03,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:03,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:03,179 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:03,206 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:11:03,225 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:03,226 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:03,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:03,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:03,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:03,294 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:11:03,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:05,238 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:05,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119713868] [2021-05-06 11:11:05,238 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2119713868] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:05,238 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:05,238 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-06 11:11:05,238 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136764378] [2021-05-06 11:11:05,239 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-06 11:11:05,239 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:05,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-06 11:11:05,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=5342, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:11:05,239 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand has 74 states, 73 states have (on average 1.2876712328767124) internal successors, (94), 72 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:08,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:08,773 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2021-05-06 11:11:08,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 11:11:08,773 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 1.2876712328767124) internal successors, (94), 72 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-05-06 11:11:08,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:08,774 INFO L225 Difference]: With dead ends: 112 [2021-05-06 11:11:08,774 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 11:11:08,775 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6676 ImplicationChecksByTransitivity, 4019.2ms TimeCoverageRelationStatistics Valid=569, Invalid=19737, Unknown=0, NotChecked=0, Total=20306 [2021-05-06 11:11:08,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 11:11:08,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2021-05-06 11:11:08,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:08,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2021-05-06 11:11:08,787 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 98 [2021-05-06 11:11:08,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:08,787 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2021-05-06 11:11:08,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 73 states have (on average 1.2876712328767124) internal successors, (94), 72 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:08,788 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2021-05-06 11:11:08,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:11:08,788 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:08,788 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 21, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:08,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2021-05-06 11:11:08,789 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:08,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:08,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1939122066, now seen corresponding path program 29 times [2021-05-06 11:11:08,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:08,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1655402443] [2021-05-06 11:11:08,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:08,797 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:11:08,810 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:08,812 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:08,823 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:08,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:08,838 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:11:08,852 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:08,855 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:11:08,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:08,856 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:08,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:08,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:08,878 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:11:08,889 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:08,889 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:08,891 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:11:08,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:08,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:08,900 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:08,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:08,915 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:11:08,925 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:08,929 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:11:08,942 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:08,944 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:08,957 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:08,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:08,976 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:11:08,997 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:08,998 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:09,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:09,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:09,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:09,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:11:09,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:11,030 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:11,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1655402443] [2021-05-06 11:11:11,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1655402443] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:11,031 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:11,031 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 11:11:11,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335550329] [2021-05-06 11:11:11,031 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 11:11:11,031 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:11,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 11:11:11,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=5639, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 11:11:11,032 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 76 states, 75 states have (on average 1.2933333333333332) internal successors, (97), 74 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:14,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:14,773 INFO L93 Difference]: Finished difference Result 115 states and 119 transitions. [2021-05-06 11:11:14,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 11:11:14,773 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 1.2933333333333332) internal successors, (97), 74 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-06 11:11:14,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:14,774 INFO L225 Difference]: With dead ends: 115 [2021-05-06 11:11:14,774 INFO L226 Difference]: Without dead ends: 107 [2021-05-06 11:11:14,775 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7077 ImplicationChecksByTransitivity, 4149.2ms TimeCoverageRelationStatistics Valid=584, Invalid=20878, Unknown=0, NotChecked=0, Total=21462 [2021-05-06 11:11:14,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-06 11:11:14,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-06 11:11:14,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0198019801980198) internal successors, (103), 101 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:14,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2021-05-06 11:11:14,787 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 101 [2021-05-06 11:11:14,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:14,787 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2021-05-06 11:11:14,787 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 75 states have (on average 1.2933333333333332) internal successors, (97), 74 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:14,788 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2021-05-06 11:11:14,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 11:11:14,788 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:14,788 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 22, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:14,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139 [2021-05-06 11:11:14,788 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:14,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:14,789 INFO L82 PathProgramCache]: Analyzing trace with hash -2045885527, now seen corresponding path program 30 times [2021-05-06 11:11:14,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:14,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1339908331] [2021-05-06 11:11:14,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:14,798 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:11:14,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:14,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:14,811 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:14,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:14,834 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:11:14,847 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:14,850 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:11:14,859 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:14,861 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:14,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:14,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:14,879 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:11:14,890 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:14,891 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:14,893 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:11:14,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:14,897 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:14,904 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:14,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:14,919 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:11:14,932 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:14,935 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:11:14,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:14,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:14,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:14,964 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:14,974 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:11:14,988 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:14,989 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:14,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:15,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:15,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:15,072 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:11:15,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:17,154 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:17,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1339908331] [2021-05-06 11:11:17,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1339908331] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:17,155 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:17,155 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-06 11:11:17,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396142165] [2021-05-06 11:11:17,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-06 11:11:17,155 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:17,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-06 11:11:17,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=5944, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:11:17,156 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 78 states, 77 states have (on average 1.2987012987012987) internal successors, (100), 76 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:21,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:21,007 INFO L93 Difference]: Finished difference Result 118 states and 122 transitions. [2021-05-06 11:11:21,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-06 11:11:21,008 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 77 states have (on average 1.2987012987012987) internal successors, (100), 76 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-06 11:11:21,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:21,008 INFO L225 Difference]: With dead ends: 118 [2021-05-06 11:11:21,008 INFO L226 Difference]: Without dead ends: 110 [2021-05-06 11:11:21,010 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7488 ImplicationChecksByTransitivity, 4363.3ms TimeCoverageRelationStatistics Valid=599, Invalid=22051, Unknown=0, NotChecked=0, Total=22650 [2021-05-06 11:11:21,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-06 11:11:21,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-06 11:11:21,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0192307692307692) internal successors, (106), 104 states have internal predecessors, (106), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:21,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2021-05-06 11:11:21,027 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 104 [2021-05-06 11:11:21,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:21,027 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2021-05-06 11:11:21,027 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 77 states have (on average 1.2987012987012987) internal successors, (100), 76 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:21,027 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2021-05-06 11:11:21,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 11:11:21,028 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:21,028 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 23, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:21,028 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable144 [2021-05-06 11:11:21,028 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:21,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:21,028 INFO L82 PathProgramCache]: Analyzing trace with hash -65385842, now seen corresponding path program 31 times [2021-05-06 11:11:21,028 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:21,028 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474036824] [2021-05-06 11:11:21,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:21,035 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:11:21,035 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:21,036 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:21,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:21,049 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:21,068 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:11:21,081 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:21,083 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:11:21,084 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:21,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:21,091 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:21,093 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:21,106 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:11:21,117 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:21,118 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:21,120 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:11:21,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:21,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:21,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:21,130 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:21,143 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:11:21,154 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:21,171 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:11:21,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:21,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:21,186 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:21,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:21,213 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:11:21,226 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:21,227 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:21,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:21,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:21,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:21,301 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:11:21,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:23,423 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:23,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474036824] [2021-05-06 11:11:23,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [474036824] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:23,423 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:23,423 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-06 11:11:23,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543329254] [2021-05-06 11:11:23,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-06 11:11:23,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:23,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-06 11:11:23,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=6257, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 11:11:23,424 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand has 80 states, 79 states have (on average 1.3037974683544304) internal successors, (103), 78 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:27,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:27,471 INFO L93 Difference]: Finished difference Result 121 states and 125 transitions. [2021-05-06 11:11:27,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-06 11:11:27,471 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 79 states have (on average 1.3037974683544304) internal successors, (103), 78 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-06 11:11:27,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:27,472 INFO L225 Difference]: With dead ends: 121 [2021-05-06 11:11:27,472 INFO L226 Difference]: Without dead ends: 113 [2021-05-06 11:11:27,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7909 ImplicationChecksByTransitivity, 4487.2ms TimeCoverageRelationStatistics Valid=614, Invalid=23256, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 11:11:27,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-06 11:11:27,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2021-05-06 11:11:27,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.0186915887850467) internal successors, (109), 107 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:27,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2021-05-06 11:11:27,483 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 107 [2021-05-06 11:11:27,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:27,483 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2021-05-06 11:11:27,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 80 states, 79 states have (on average 1.3037974683544304) internal successors, (103), 78 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:27,483 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2021-05-06 11:11:27,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-06 11:11:27,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:27,484 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 24, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:27,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2021-05-06 11:11:27,484 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:27,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:27,484 INFO L82 PathProgramCache]: Analyzing trace with hash 1034984841, now seen corresponding path program 32 times [2021-05-06 11:11:27,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:27,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082983742] [2021-05-06 11:11:27,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:27,499 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:11:27,500 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:27,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:27,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:27,524 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:27,551 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:11:27,569 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:27,572 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:11:27,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:27,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:27,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:27,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:27,601 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:11:27,614 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:27,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:27,617 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:11:27,628 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:27,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:27,637 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:27,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:27,645 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:11:27,655 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:27,658 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:11:27,674 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:27,675 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:27,688 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:27,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:27,706 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:11:27,721 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:27,722 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:27,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:27,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:27,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:27,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:11:27,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:30,157 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:30,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082983742] [2021-05-06 11:11:30,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2082983742] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:30,157 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:30,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-06 11:11:30,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880877201] [2021-05-06 11:11:30,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 11:11:30,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:30,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 11:11:30,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=6578, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:11:30,159 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 82 states, 81 states have (on average 1.308641975308642) internal successors, (106), 80 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:34,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:34,363 INFO L93 Difference]: Finished difference Result 124 states and 128 transitions. [2021-05-06 11:11:34,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-06 11:11:34,364 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 81 states have (on average 1.308641975308642) internal successors, (106), 80 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2021-05-06 11:11:34,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:34,364 INFO L225 Difference]: With dead ends: 124 [2021-05-06 11:11:34,364 INFO L226 Difference]: Without dead ends: 116 [2021-05-06 11:11:34,365 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8340 ImplicationChecksByTransitivity, 4813.2ms TimeCoverageRelationStatistics Valid=629, Invalid=24493, Unknown=0, NotChecked=0, Total=25122 [2021-05-06 11:11:34,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-06 11:11:34,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2021-05-06 11:11:34,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.018181818181818) internal successors, (112), 110 states have internal predecessors, (112), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:34,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2021-05-06 11:11:34,378 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 110 [2021-05-06 11:11:34,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:34,378 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2021-05-06 11:11:34,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 81 states have (on average 1.308641975308642) internal successors, (106), 80 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:34,378 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2021-05-06 11:11:34,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 11:11:34,379 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:34,379 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 25, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:34,379 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154 [2021-05-06 11:11:34,379 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:34,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:34,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1307368274, now seen corresponding path program 33 times [2021-05-06 11:11:34,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:34,380 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053178765] [2021-05-06 11:11:34,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:34,387 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:11:34,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:34,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:34,401 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:34,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:34,424 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:11:34,438 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:34,440 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:11:34,441 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:34,442 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:34,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:34,450 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:34,467 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:11:34,477 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:34,479 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:34,481 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:11:34,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:34,482 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:34,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:34,492 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:34,504 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:11:34,515 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:34,518 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:11:34,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:34,520 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:34,529 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:34,533 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:34,558 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:11:34,571 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:34,572 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:34,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:34,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:34,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:34,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:11:34,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:36,947 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:36,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053178765] [2021-05-06 11:11:36,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2053178765] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:36,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:36,948 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-06 11:11:36,948 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032498648] [2021-05-06 11:11:36,948 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-06 11:11:36,948 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:36,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-06 11:11:36,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=6907, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:11:36,949 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand has 84 states, 83 states have (on average 1.3132530120481927) internal successors, (109), 82 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:41,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:41,301 INFO L93 Difference]: Finished difference Result 127 states and 131 transitions. [2021-05-06 11:11:41,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-06 11:11:41,302 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 83 states have (on average 1.3132530120481927) internal successors, (109), 82 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-06 11:11:41,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:41,302 INFO L225 Difference]: With dead ends: 127 [2021-05-06 11:11:41,302 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 11:11:41,304 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8781 ImplicationChecksByTransitivity, 4838.7ms TimeCoverageRelationStatistics Valid=644, Invalid=25762, Unknown=0, NotChecked=0, Total=26406 [2021-05-06 11:11:41,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 11:11:41,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2021-05-06 11:11:41,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0176991150442478) internal successors, (115), 113 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:41,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2021-05-06 11:11:41,320 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 113 [2021-05-06 11:11:41,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:41,320 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2021-05-06 11:11:41,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 83 states have (on average 1.3132530120481927) internal successors, (109), 82 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:41,320 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2021-05-06 11:11:41,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-06 11:11:41,321 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:41,321 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 26, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:41,321 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable159 [2021-05-06 11:11:41,321 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:41,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:41,321 INFO L82 PathProgramCache]: Analyzing trace with hash -2015359127, now seen corresponding path program 34 times [2021-05-06 11:11:41,321 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:41,321 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086849249] [2021-05-06 11:11:41,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:41,328 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:11:41,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:41,353 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:41,363 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:11:41,376 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:41,379 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:11:41,380 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,381 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,387 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:41,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:41,402 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:11:41,412 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:41,413 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:41,415 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:11:41,424 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:41,434 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:41,439 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:11:41,450 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:41,458 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:11:41,459 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:41,471 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:41,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:41,493 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:11:41,507 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:41,508 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:41,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:41,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:41,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:41,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:11:41,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:44,001 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:44,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086849249] [2021-05-06 11:11:44,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2086849249] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:44,002 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:44,002 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2021-05-06 11:11:44,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70363908] [2021-05-06 11:11:44,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2021-05-06 11:11:44,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:44,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-05-06 11:11:44,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=7244, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 11:11:44,003 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand has 86 states, 85 states have (on average 1.3176470588235294) internal successors, (112), 84 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:48,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:48,568 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2021-05-06 11:11:48,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-06 11:11:48,568 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 1.3176470588235294) internal successors, (112), 84 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2021-05-06 11:11:48,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:48,569 INFO L225 Difference]: With dead ends: 130 [2021-05-06 11:11:48,569 INFO L226 Difference]: Without dead ends: 122 [2021-05-06 11:11:48,570 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9232 ImplicationChecksByTransitivity, 5071.7ms TimeCoverageRelationStatistics Valid=659, Invalid=27063, Unknown=0, NotChecked=0, Total=27722 [2021-05-06 11:11:48,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-06 11:11:48,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-06 11:11:48,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0172413793103448) internal successors, (118), 116 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:48,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2021-05-06 11:11:48,586 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 116 [2021-05-06 11:11:48,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:48,586 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2021-05-06 11:11:48,586 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 86 states, 85 states have (on average 1.3176470588235294) internal successors, (112), 84 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:48,586 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2021-05-06 11:11:48,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 11:11:48,587 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:48,587 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 27, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:48,587 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164 [2021-05-06 11:11:48,587 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:48,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:48,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1186470194, now seen corresponding path program 35 times [2021-05-06 11:11:48,587 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:48,588 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1051356668] [2021-05-06 11:11:48,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:48,594 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:11:48,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:48,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:48,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:48,620 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:48,630 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:11:48,643 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:48,649 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:11:48,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:48,659 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:48,666 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:48,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:48,673 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:11:48,684 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:48,684 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:48,686 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:11:48,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:48,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:48,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:48,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:48,713 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:11:48,723 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:48,727 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:11:48,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:48,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:48,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:48,752 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:48,762 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:11:48,775 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:48,776 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:48,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:48,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:48,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:48,838 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:11:48,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:51,412 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:51,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1051356668] [2021-05-06 11:11:51,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1051356668] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:51,412 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:51,412 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2021-05-06 11:11:51,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630213732] [2021-05-06 11:11:51,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 88 states [2021-05-06 11:11:51,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:51,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-05-06 11:11:51,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=7589, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 11:11:51,414 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand has 88 states, 87 states have (on average 1.3218390804597702) internal successors, (115), 86 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:56,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:56,329 INFO L93 Difference]: Finished difference Result 133 states and 137 transitions. [2021-05-06 11:11:56,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-06 11:11:56,330 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 87 states have (on average 1.3218390804597702) internal successors, (115), 86 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-06 11:11:56,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:56,330 INFO L225 Difference]: With dead ends: 133 [2021-05-06 11:11:56,330 INFO L226 Difference]: Without dead ends: 125 [2021-05-06 11:11:56,331 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9693 ImplicationChecksByTransitivity, 5344.2ms TimeCoverageRelationStatistics Valid=674, Invalid=28396, Unknown=0, NotChecked=0, Total=29070 [2021-05-06 11:11:56,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-06 11:11:56,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-05-06 11:11:56,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:56,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2021-05-06 11:11:56,350 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 119 [2021-05-06 11:11:56,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:56,350 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2021-05-06 11:11:56,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 88 states, 87 states have (on average 1.3218390804597702) internal successors, (115), 86 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:11:56,350 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2021-05-06 11:11:56,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-06 11:11:56,351 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:56,351 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 28, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:56,351 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable169 [2021-05-06 11:11:56,351 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:56,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:56,351 INFO L82 PathProgramCache]: Analyzing trace with hash 476748105, now seen corresponding path program 36 times [2021-05-06 11:11:56,351 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:56,351 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1308266882] [2021-05-06 11:11:56,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:56,359 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:11:56,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:56,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:56,373 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:56,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:56,401 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:11:56,416 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:56,420 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:11:56,421 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:56,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:56,430 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:11:56,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:11:56,447 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:11:56,459 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:56,460 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:56,462 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:11:56,479 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:56,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:56,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:56,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:56,497 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:11:56,508 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:56,512 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:11:56,527 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:56,528 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:11:56,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:11:56,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:11:56,555 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:11:56,570 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:11:56,571 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:11:56,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:56,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:56,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:56,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:11:56,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:11:59,380 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:59,380 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1308266882] [2021-05-06 11:11:59,380 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1308266882] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:59,380 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:59,380 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2021-05-06 11:11:59,380 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921075531] [2021-05-06 11:11:59,381 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2021-05-06 11:11:59,381 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:59,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-05-06 11:11:59,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=7942, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 11:11:59,381 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand has 90 states, 89 states have (on average 1.3258426966292134) internal successors, (118), 88 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:04,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:04,339 INFO L93 Difference]: Finished difference Result 136 states and 140 transitions. [2021-05-06 11:12:04,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-06 11:12:04,340 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 89 states have (on average 1.3258426966292134) internal successors, (118), 88 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2021-05-06 11:12:04,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:04,341 INFO L225 Difference]: With dead ends: 136 [2021-05-06 11:12:04,341 INFO L226 Difference]: Without dead ends: 128 [2021-05-06 11:12:04,342 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10164 ImplicationChecksByTransitivity, 5580.6ms TimeCoverageRelationStatistics Valid=689, Invalid=29761, Unknown=0, NotChecked=0, Total=30450 [2021-05-06 11:12:04,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-06 11:12:04,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2021-05-06 11:12:04,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0163934426229508) internal successors, (124), 122 states have internal predecessors, (124), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:04,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2021-05-06 11:12:04,362 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 122 [2021-05-06 11:12:04,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:04,362 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2021-05-06 11:12:04,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 90 states, 89 states have (on average 1.3258426966292134) internal successors, (118), 88 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:04,362 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2021-05-06 11:12:04,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 11:12:04,363 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:04,363 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 29, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:04,363 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable174 [2021-05-06 11:12:04,363 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:04,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:04,364 INFO L82 PathProgramCache]: Analyzing trace with hash -1624600338, now seen corresponding path program 37 times [2021-05-06 11:12:04,364 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:04,364 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1632535360] [2021-05-06 11:12:04,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:04,377 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:12:04,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:04,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:04,430 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:12:04,445 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:04,448 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:12:04,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:04,462 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:04,477 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:12:04,490 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:04,491 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:04,493 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:12:04,503 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:04,520 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:04,527 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:12:04,539 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:04,543 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:12:04,557 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:04,571 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:04,575 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:04,587 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:12:04,604 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:04,605 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:04,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:04,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:04,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:04,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:12:04,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:07,511 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:07,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1632535360] [2021-05-06 11:12:07,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1632535360] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:07,511 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:07,511 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2021-05-06 11:12:07,511 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480540258] [2021-05-06 11:12:07,512 INFO L460 AbstractCegarLoop]: Interpolant automaton has 92 states [2021-05-06 11:12:07,512 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:07,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-05-06 11:12:07,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=8303, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 11:12:07,512 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand has 92 states, 91 states have (on average 1.3296703296703296) internal successors, (121), 90 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:12,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:12,638 INFO L93 Difference]: Finished difference Result 139 states and 143 transitions. [2021-05-06 11:12:12,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-06 11:12:12,639 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 91 states have (on average 1.3296703296703296) internal successors, (121), 90 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2021-05-06 11:12:12,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:12,639 INFO L225 Difference]: With dead ends: 139 [2021-05-06 11:12:12,639 INFO L226 Difference]: Without dead ends: 131 [2021-05-06 11:12:12,640 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10645 ImplicationChecksByTransitivity, 5754.4ms TimeCoverageRelationStatistics Valid=704, Invalid=31158, Unknown=0, NotChecked=0, Total=31862 [2021-05-06 11:12:12,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-06 11:12:12,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2021-05-06 11:12:12,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.016) internal successors, (127), 125 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:12,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2021-05-06 11:12:12,655 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 125 [2021-05-06 11:12:12,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:12,655 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2021-05-06 11:12:12,655 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 92 states, 91 states have (on average 1.3296703296703296) internal successors, (121), 90 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:12,655 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2021-05-06 11:12:12,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-06 11:12:12,656 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:12,656 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:12,656 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable179 [2021-05-06 11:12:12,656 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:12,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:12,656 INFO L82 PathProgramCache]: Analyzing trace with hash 547240745, now seen corresponding path program 38 times [2021-05-06 11:12:12,656 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:12,656 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536222071] [2021-05-06 11:12:12,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:12,662 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:12:12,674 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:12,675 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:12,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:12,688 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:12,698 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:12:12,711 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:12,713 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:12:12,722 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:12,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:12,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:12,732 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:12,738 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:12:12,748 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:12,749 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:12,751 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:12:12,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:12,761 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:12,768 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:12,770 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:12,776 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:12:12,786 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:12,789 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:12:12,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:12,790 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:12,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:12,803 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:12,822 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:12:12,835 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:12,836 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:12,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:12,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:12,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:12,902 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:12:12,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:15,818 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:15,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536222071] [2021-05-06 11:12:15,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1536222071] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:15,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:15,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2021-05-06 11:12:15,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160666676] [2021-05-06 11:12:15,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2021-05-06 11:12:15,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:15,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-05-06 11:12:15,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=8672, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:12:15,820 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 94 states, 93 states have (on average 1.3333333333333333) internal successors, (124), 92 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:21,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:21,153 INFO L93 Difference]: Finished difference Result 142 states and 146 transitions. [2021-05-06 11:12:21,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-05-06 11:12:21,154 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 93 states have (on average 1.3333333333333333) internal successors, (124), 92 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 128 [2021-05-06 11:12:21,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:21,154 INFO L225 Difference]: With dead ends: 142 [2021-05-06 11:12:21,155 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 11:12:21,162 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11136 ImplicationChecksByTransitivity, 5961.7ms TimeCoverageRelationStatistics Valid=719, Invalid=32587, Unknown=0, NotChecked=0, Total=33306 [2021-05-06 11:12:21,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 11:12:21,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-05-06 11:12:21,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.015625) internal successors, (130), 128 states have internal predecessors, (130), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:21,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2021-05-06 11:12:21,183 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 128 [2021-05-06 11:12:21,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:21,183 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2021-05-06 11:12:21,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 94 states, 93 states have (on average 1.3333333333333333) internal successors, (124), 92 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:21,183 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2021-05-06 11:12:21,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-06 11:12:21,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:21,184 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:21,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable184 [2021-05-06 11:12:21,184 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:21,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:21,184 INFO L82 PathProgramCache]: Analyzing trace with hash -1817369842, now seen corresponding path program 39 times [2021-05-06 11:12:21,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:21,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738318334] [2021-05-06 11:12:21,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:21,193 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:12:21,194 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:21,195 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:21,207 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:21,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:21,234 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:12:21,250 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:21,253 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:12:21,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:21,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:21,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:21,266 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:21,280 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:12:21,292 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:21,293 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:21,296 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:12:21,296 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:21,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:21,305 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:21,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:21,323 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:12:21,335 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:21,339 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:12:21,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:21,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:21,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:21,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:21,381 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:12:21,397 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:21,398 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:21,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:21,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:21,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:21,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:12:21,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:24,497 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:24,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738318334] [2021-05-06 11:12:24,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1738318334] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:24,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:24,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2021-05-06 11:12:24,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190777856] [2021-05-06 11:12:24,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2021-05-06 11:12:24,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:24,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-05-06 11:12:24,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=9049, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 11:12:24,499 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand has 96 states, 95 states have (on average 1.3368421052631578) internal successors, (127), 94 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:30,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:30,099 INFO L93 Difference]: Finished difference Result 145 states and 149 transitions. [2021-05-06 11:12:30,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-05-06 11:12:30,099 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 95 states have (on average 1.3368421052631578) internal successors, (127), 94 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-06 11:12:30,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:30,100 INFO L225 Difference]: With dead ends: 145 [2021-05-06 11:12:30,100 INFO L226 Difference]: Without dead ends: 137 [2021-05-06 11:12:30,102 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11637 ImplicationChecksByTransitivity, 6178.8ms TimeCoverageRelationStatistics Valid=734, Invalid=34048, Unknown=0, NotChecked=0, Total=34782 [2021-05-06 11:12:30,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-06 11:12:30,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-05-06 11:12:30,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.015267175572519) internal successors, (133), 131 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:30,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2021-05-06 11:12:30,123 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 131 [2021-05-06 11:12:30,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:30,123 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2021-05-06 11:12:30,123 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 96 states, 95 states have (on average 1.3368421052631578) internal successors, (127), 94 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:30,123 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2021-05-06 11:12:30,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-06 11:12:30,124 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:30,124 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:30,124 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable189 [2021-05-06 11:12:30,124 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:30,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:30,124 INFO L82 PathProgramCache]: Analyzing trace with hash 122221833, now seen corresponding path program 40 times [2021-05-06 11:12:30,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:30,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [866814395] [2021-05-06 11:12:30,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:30,133 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:12:30,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:30,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:30,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:30,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:30,170 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:12:30,184 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:30,187 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:12:30,196 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:30,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:30,206 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:30,208 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:30,214 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:12:30,225 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:30,226 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:30,230 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:12:30,240 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:30,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:30,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:30,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:30,272 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:12:30,283 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:30,287 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:12:30,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:30,289 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:30,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:30,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:30,321 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:12:30,335 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:30,336 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:30,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:30,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:30,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:30,398 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:12:30,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:33,540 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:33,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [866814395] [2021-05-06 11:12:33,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [866814395] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:33,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:33,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2021-05-06 11:12:33,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127378130] [2021-05-06 11:12:33,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2021-05-06 11:12:33,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:33,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-05-06 11:12:33,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=9434, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:12:33,542 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 98 states, 97 states have (on average 1.3402061855670102) internal successors, (130), 96 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:39,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:39,305 INFO L93 Difference]: Finished difference Result 148 states and 152 transitions. [2021-05-06 11:12:39,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-05-06 11:12:39,306 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 97 states have (on average 1.3402061855670102) internal successors, (130), 96 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-06 11:12:39,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:39,306 INFO L225 Difference]: With dead ends: 148 [2021-05-06 11:12:39,306 INFO L226 Difference]: Without dead ends: 140 [2021-05-06 11:12:39,308 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12148 ImplicationChecksByTransitivity, 6388.2ms TimeCoverageRelationStatistics Valid=749, Invalid=35541, Unknown=0, NotChecked=0, Total=36290 [2021-05-06 11:12:39,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-06 11:12:39,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-06 11:12:39,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:39,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2021-05-06 11:12:39,330 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 134 [2021-05-06 11:12:39,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:39,330 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2021-05-06 11:12:39,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 98 states, 97 states have (on average 1.3402061855670102) internal successors, (130), 96 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:39,331 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2021-05-06 11:12:39,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-06 11:12:39,331 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:39,331 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:39,332 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable194 [2021-05-06 11:12:39,332 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:39,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:39,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1992188626, now seen corresponding path program 41 times [2021-05-06 11:12:39,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:39,332 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317742388] [2021-05-06 11:12:39,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:39,340 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:12:39,355 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:39,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:39,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:39,373 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:39,385 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:12:39,406 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:39,409 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:12:39,418 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:39,419 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:39,428 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:39,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:39,439 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:12:39,455 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:39,456 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:39,458 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:12:39,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:39,470 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:39,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:39,479 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:39,485 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:12:39,495 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:39,499 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:12:39,500 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:39,502 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:39,514 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:39,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:39,538 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:12:39,551 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:39,552 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:39,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:39,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:39,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:39,616 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:12:39,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:42,884 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:42,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317742388] [2021-05-06 11:12:42,885 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [317742388] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:42,885 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:42,885 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2021-05-06 11:12:42,885 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372621029] [2021-05-06 11:12:42,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 100 states [2021-05-06 11:12:42,885 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:42,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-05-06 11:12:42,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=9827, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 11:12:42,886 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand has 100 states, 99 states have (on average 1.3434343434343434) internal successors, (133), 98 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:48,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:48,898 INFO L93 Difference]: Finished difference Result 151 states and 155 transitions. [2021-05-06 11:12:48,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 11:12:48,898 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 99 states have (on average 1.3434343434343434) internal successors, (133), 98 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-06 11:12:48,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:48,899 INFO L225 Difference]: With dead ends: 151 [2021-05-06 11:12:48,899 INFO L226 Difference]: Without dead ends: 143 [2021-05-06 11:12:48,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12669 ImplicationChecksByTransitivity, 6679.4ms TimeCoverageRelationStatistics Valid=764, Invalid=37066, Unknown=0, NotChecked=0, Total=37830 [2021-05-06 11:12:48,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-06 11:12:48,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2021-05-06 11:12:48,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 137 states have (on average 1.0145985401459854) internal successors, (139), 137 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:48,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2021-05-06 11:12:48,915 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 137 [2021-05-06 11:12:48,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:48,916 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2021-05-06 11:12:48,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 100 states, 99 states have (on average 1.3434343434343434) internal successors, (133), 98 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:48,916 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2021-05-06 11:12:48,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-05-06 11:12:48,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:48,916 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 34, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:48,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable199 [2021-05-06 11:12:48,916 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:48,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:48,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1891157737, now seen corresponding path program 42 times [2021-05-06 11:12:48,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:48,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [744126896] [2021-05-06 11:12:48,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:48,935 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:12:48,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:48,937 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:48,947 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:48,950 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:48,970 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:12:48,983 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:48,986 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:12:48,995 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:48,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:49,004 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:49,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:49,011 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:12:49,022 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:49,022 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:49,024 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:12:49,025 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:49,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:49,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:49,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:49,048 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:12:49,058 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:49,061 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:12:49,062 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:49,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:49,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:49,077 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:49,095 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:12:49,109 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:49,110 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:49,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:49,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:49,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:49,175 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:12:49,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:12:52,563 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:52,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [744126896] [2021-05-06 11:12:52,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [744126896] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:52,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:52,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2021-05-06 11:12:52,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112652835] [2021-05-06 11:12:52,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2021-05-06 11:12:52,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:52,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-05-06 11:12:52,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=10228, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 11:12:52,565 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 102 states, 101 states have (on average 1.3465346534653466) internal successors, (136), 100 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:58,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:58,767 INFO L93 Difference]: Finished difference Result 154 states and 158 transitions. [2021-05-06 11:12:58,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-05-06 11:12:58,768 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 101 states have (on average 1.3465346534653466) internal successors, (136), 100 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 140 [2021-05-06 11:12:58,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:58,769 INFO L225 Difference]: With dead ends: 154 [2021-05-06 11:12:58,769 INFO L226 Difference]: Without dead ends: 146 [2021-05-06 11:12:58,771 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13200 ImplicationChecksByTransitivity, 6885.0ms TimeCoverageRelationStatistics Valid=779, Invalid=38623, Unknown=0, NotChecked=0, Total=39402 [2021-05-06 11:12:58,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-06 11:12:58,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2021-05-06 11:12:58,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0142857142857142) internal successors, (142), 140 states have internal predecessors, (142), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:58,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 146 transitions. [2021-05-06 11:12:58,789 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 146 transitions. Word has length 140 [2021-05-06 11:12:58,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:58,789 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 146 transitions. [2021-05-06 11:12:58,789 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 102 states, 101 states have (on average 1.3465346534653466) internal successors, (136), 100 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:58,789 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 146 transitions. [2021-05-06 11:12:58,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 11:12:58,790 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:58,790 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 35, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:58,790 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable204 [2021-05-06 11:12:58,790 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:58,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:58,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1423572814, now seen corresponding path program 43 times [2021-05-06 11:12:58,791 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:58,791 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646362316] [2021-05-06 11:12:58,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:58,802 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:12:58,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:58,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:58,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:58,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:58,843 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:12:58,856 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:58,859 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:12:58,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:58,869 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:58,876 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:12:58,878 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:12:58,884 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:12:58,894 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:58,895 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:58,899 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:12:58,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:58,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:58,907 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:58,909 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:58,922 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:12:58,932 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:58,935 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:12:58,947 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:58,949 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:12:58,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:12:58,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:12:58,972 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:12:58,986 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:12:58,986 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:12:58,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:59,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:59,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:59,059 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:12:59,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:02,693 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:02,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646362316] [2021-05-06 11:13:02,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1646362316] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:02,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:02,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [104] imperfect sequences [] total 104 [2021-05-06 11:13:02,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713261356] [2021-05-06 11:13:02,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 104 states [2021-05-06 11:13:02,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:02,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-05-06 11:13:02,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=10637, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 11:13:02,695 INFO L87 Difference]: Start difference. First operand 145 states and 146 transitions. Second operand has 104 states, 103 states have (on average 1.3495145631067962) internal successors, (139), 102 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:09,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:09,187 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2021-05-06 11:13:09,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-05-06 11:13:09,188 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 103 states have (on average 1.3495145631067962) internal successors, (139), 102 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2021-05-06 11:13:09,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:09,188 INFO L225 Difference]: With dead ends: 157 [2021-05-06 11:13:09,188 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 11:13:09,191 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13741 ImplicationChecksByTransitivity, 7231.6ms TimeCoverageRelationStatistics Valid=794, Invalid=40212, Unknown=0, NotChecked=0, Total=41006 [2021-05-06 11:13:09,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 11:13:09,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 148. [2021-05-06 11:13:09,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:09,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2021-05-06 11:13:09,215 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 143 [2021-05-06 11:13:09,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:09,216 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2021-05-06 11:13:09,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 104 states, 103 states have (on average 1.3495145631067962) internal successors, (139), 102 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:09,216 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2021-05-06 11:13:09,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-06 11:13:09,217 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:09,217 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 36, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:09,217 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable209 [2021-05-06 11:13:09,217 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:09,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:09,217 INFO L82 PathProgramCache]: Analyzing trace with hash 180072649, now seen corresponding path program 44 times [2021-05-06 11:13:09,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:09,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1100692937] [2021-05-06 11:13:09,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:09,229 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:13:09,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:09,231 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:09,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:09,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:09,267 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:13:09,281 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:09,284 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:13:09,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:09,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:09,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:09,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:09,317 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:13:09,328 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:09,329 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:09,331 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:13:09,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:09,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:09,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:09,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:09,356 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:13:09,367 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:09,383 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:13:09,384 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:09,385 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:09,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:09,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:09,418 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:13:09,432 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:09,433 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:09,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:09,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:09,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:09,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:13:09,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:13,165 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:13,165 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1100692937] [2021-05-06 11:13:13,165 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1100692937] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:13,165 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:13,165 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [106] imperfect sequences [] total 106 [2021-05-06 11:13:13,165 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010203838] [2021-05-06 11:13:13,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 106 states [2021-05-06 11:13:13,165 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:13,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-05-06 11:13:13,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=11054, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 11:13:13,167 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand has 106 states, 105 states have (on average 1.3523809523809525) internal successors, (142), 104 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:19,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:19,756 INFO L93 Difference]: Finished difference Result 160 states and 164 transitions. [2021-05-06 11:13:19,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-05-06 11:13:19,757 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 105 states have (on average 1.3523809523809525) internal successors, (142), 104 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-05-06 11:13:19,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:19,757 INFO L225 Difference]: With dead ends: 160 [2021-05-06 11:13:19,757 INFO L226 Difference]: Without dead ends: 152 [2021-05-06 11:13:19,759 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14292 ImplicationChecksByTransitivity, 7372.0ms TimeCoverageRelationStatistics Valid=809, Invalid=41833, Unknown=0, NotChecked=0, Total=42642 [2021-05-06 11:13:19,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-06 11:13:19,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2021-05-06 11:13:19,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0136986301369864) internal successors, (148), 146 states have internal predecessors, (148), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:19,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2021-05-06 11:13:19,776 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 146 [2021-05-06 11:13:19,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:19,776 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2021-05-06 11:13:19,776 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 106 states, 105 states have (on average 1.3523809523809525) internal successors, (142), 104 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:19,776 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2021-05-06 11:13:19,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-06 11:13:19,776 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:19,776 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 37, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:19,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable214 [2021-05-06 11:13:19,777 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:19,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:19,777 INFO L82 PathProgramCache]: Analyzing trace with hash -840414866, now seen corresponding path program 45 times [2021-05-06 11:13:19,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:19,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [212983980] [2021-05-06 11:13:19,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:19,799 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:13:19,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:19,801 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:19,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:19,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:19,844 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:13:19,861 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:19,864 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:13:19,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:19,877 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:19,885 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:19,887 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:19,894 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:13:19,906 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:19,907 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:19,909 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:13:19,918 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:19,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:19,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:19,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:19,933 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:13:19,943 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:19,946 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:13:19,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:19,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:19,968 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:19,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:19,989 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:13:20,002 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:20,003 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:20,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:20,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:20,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:20,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:13:20,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:23,870 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:23,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [212983980] [2021-05-06 11:13:23,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [212983980] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:23,870 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:23,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [108] imperfect sequences [] total 108 [2021-05-06 11:13:23,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843880849] [2021-05-06 11:13:23,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 108 states [2021-05-06 11:13:23,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:23,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-05-06 11:13:23,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=11479, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 11:13:23,872 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand has 108 states, 107 states have (on average 1.355140186915888) internal successors, (145), 106 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:30,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:30,771 INFO L93 Difference]: Finished difference Result 163 states and 167 transitions. [2021-05-06 11:13:30,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-05-06 11:13:30,771 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 107 states have (on average 1.355140186915888) internal successors, (145), 106 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2021-05-06 11:13:30,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:30,772 INFO L225 Difference]: With dead ends: 163 [2021-05-06 11:13:30,772 INFO L226 Difference]: Without dead ends: 155 [2021-05-06 11:13:30,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14853 ImplicationChecksByTransitivity, 7617.4ms TimeCoverageRelationStatistics Valid=824, Invalid=43486, Unknown=0, NotChecked=0, Total=44310 [2021-05-06 11:13:30,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-06 11:13:30,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2021-05-06 11:13:30,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.0134228187919463) internal successors, (151), 149 states have internal predecessors, (151), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:30,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2021-05-06 11:13:30,790 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 149 [2021-05-06 11:13:30,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:30,791 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2021-05-06 11:13:30,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 108 states, 107 states have (on average 1.355140186915888) internal successors, (145), 106 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:30,791 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2021-05-06 11:13:30,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-05-06 11:13:30,791 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:30,791 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 38, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:30,791 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable219 [2021-05-06 11:13:30,791 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:30,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:30,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1889514153, now seen corresponding path program 46 times [2021-05-06 11:13:30,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:30,792 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338405212] [2021-05-06 11:13:30,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:30,799 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:13:30,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:30,801 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:30,811 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:30,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:30,841 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:13:30,854 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:30,857 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:13:30,866 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:30,866 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:30,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:30,882 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:30,887 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:13:30,898 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:30,899 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:30,900 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:13:30,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:30,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:30,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:30,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:30,923 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:13:30,933 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:30,942 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:13:30,943 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:30,944 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:30,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:30,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:30,978 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:13:30,992 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:30,992 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:30,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:31,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:31,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:31,057 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:13:31,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:35,081 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:35,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338405212] [2021-05-06 11:13:35,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [338405212] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:35,082 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:35,082 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [110] imperfect sequences [] total 110 [2021-05-06 11:13:35,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334436088] [2021-05-06 11:13:35,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 110 states [2021-05-06 11:13:35,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:35,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2021-05-06 11:13:35,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=11912, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 11:13:35,083 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand has 110 states, 109 states have (on average 1.3577981651376148) internal successors, (148), 108 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:42,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:42,204 INFO L93 Difference]: Finished difference Result 166 states and 170 transitions. [2021-05-06 11:13:42,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-05-06 11:13:42,204 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 109 states have (on average 1.3577981651376148) internal successors, (148), 108 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 152 [2021-05-06 11:13:42,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:42,205 INFO L225 Difference]: With dead ends: 166 [2021-05-06 11:13:42,205 INFO L226 Difference]: Without dead ends: 158 [2021-05-06 11:13:42,207 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15424 ImplicationChecksByTransitivity, 7984.8ms TimeCoverageRelationStatistics Valid=839, Invalid=45171, Unknown=0, NotChecked=0, Total=46010 [2021-05-06 11:13:42,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-06 11:13:42,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2021-05-06 11:13:42,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.013157894736842) internal successors, (154), 152 states have internal predecessors, (154), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:42,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2021-05-06 11:13:42,226 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 152 [2021-05-06 11:13:42,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:42,226 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2021-05-06 11:13:42,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 110 states, 109 states have (on average 1.3577981651376148) internal successors, (148), 108 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:42,226 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2021-05-06 11:13:42,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-06 11:13:42,227 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:42,227 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 39, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:42,227 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable224 [2021-05-06 11:13:42,227 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:42,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:42,227 INFO L82 PathProgramCache]: Analyzing trace with hash -295797874, now seen corresponding path program 47 times [2021-05-06 11:13:42,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:42,228 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1724839036] [2021-05-06 11:13:42,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:42,236 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:13:42,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:42,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:42,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:42,251 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:42,271 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:13:42,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:42,287 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:13:42,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:42,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:42,295 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:42,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:42,310 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:13:42,320 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:42,321 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:42,323 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:13:42,332 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:42,332 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:42,340 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:42,341 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:42,347 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:13:42,357 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:42,373 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:13:42,374 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:42,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:42,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:42,392 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:42,413 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:13:42,426 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:42,427 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:42,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:42,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:42,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:42,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:13:42,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:46,533 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:46,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1724839036] [2021-05-06 11:13:46,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1724839036] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:46,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:46,534 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [112] imperfect sequences [] total 112 [2021-05-06 11:13:46,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5233444] [2021-05-06 11:13:46,534 INFO L460 AbstractCegarLoop]: Interpolant automaton has 112 states [2021-05-06 11:13:46,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:46,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2021-05-06 11:13:46,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=12353, Unknown=0, NotChecked=0, Total=12656 [2021-05-06 11:13:46,535 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand has 112 states, 111 states have (on average 1.3603603603603605) internal successors, (151), 110 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:53,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:53,957 INFO L93 Difference]: Finished difference Result 169 states and 173 transitions. [2021-05-06 11:13:53,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-05-06 11:13:53,958 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 111 states have (on average 1.3603603603603605) internal successors, (151), 110 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-06 11:13:53,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:53,958 INFO L225 Difference]: With dead ends: 169 [2021-05-06 11:13:53,958 INFO L226 Difference]: Without dead ends: 161 [2021-05-06 11:13:53,960 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 217 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16005 ImplicationChecksByTransitivity, 8168.4ms TimeCoverageRelationStatistics Valid=854, Invalid=46888, Unknown=0, NotChecked=0, Total=47742 [2021-05-06 11:13:53,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-06 11:13:53,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2021-05-06 11:13:53,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.0129032258064516) internal successors, (157), 155 states have internal predecessors, (157), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:53,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2021-05-06 11:13:53,979 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 155 [2021-05-06 11:13:53,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:53,979 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2021-05-06 11:13:53,979 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 112 states, 111 states have (on average 1.3603603603603605) internal successors, (151), 110 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:13:53,979 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2021-05-06 11:13:53,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-05-06 11:13:53,980 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:53,980 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 40, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:53,980 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable229 [2021-05-06 11:13:53,980 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:53,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:53,981 INFO L82 PathProgramCache]: Analyzing trace with hash 187878537, now seen corresponding path program 48 times [2021-05-06 11:13:53,981 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:53,981 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900400928] [2021-05-06 11:13:53,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:54,003 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:13:54,003 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:54,008 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:54,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:54,021 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:54,040 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:13:54,054 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:54,058 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:13:54,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:54,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:54,067 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:13:54,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:13:54,081 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:13:54,092 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:54,093 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:54,097 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:13:54,106 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:54,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:54,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:54,132 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:54,139 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:13:54,152 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:54,156 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:13:54,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:54,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:13:54,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:13:54,187 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:13:54,197 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:13:54,210 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:13:54,211 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:13:54,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:54,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:54,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:54,265 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:13:54,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:13:58,449 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:58,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900400928] [2021-05-06 11:13:58,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [900400928] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:58,449 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:58,449 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [114] imperfect sequences [] total 114 [2021-05-06 11:13:58,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932982345] [2021-05-06 11:13:58,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2021-05-06 11:13:58,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:58,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2021-05-06 11:13:58,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=12802, Unknown=0, NotChecked=0, Total=13110 [2021-05-06 11:13:58,450 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand has 114 states, 113 states have (on average 1.3628318584070795) internal successors, (154), 112 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:06,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:06,011 INFO L93 Difference]: Finished difference Result 172 states and 176 transitions. [2021-05-06 11:14:06,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-05-06 11:14:06,012 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 113 states have (on average 1.3628318584070795) internal successors, (154), 112 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 158 [2021-05-06 11:14:06,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:06,013 INFO L225 Difference]: With dead ends: 172 [2021-05-06 11:14:06,013 INFO L226 Difference]: Without dead ends: 164 [2021-05-06 11:14:06,014 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 221 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16596 ImplicationChecksByTransitivity, 8384.5ms TimeCoverageRelationStatistics Valid=869, Invalid=48637, Unknown=0, NotChecked=0, Total=49506 [2021-05-06 11:14:06,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-06 11:14:06,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2021-05-06 11:14:06,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.0126582278481013) internal successors, (160), 158 states have internal predecessors, (160), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:06,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2021-05-06 11:14:06,033 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 158 [2021-05-06 11:14:06,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:06,034 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2021-05-06 11:14:06,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 114 states, 113 states have (on average 1.3628318584070795) internal successors, (154), 112 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:06,034 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2021-05-06 11:14:06,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-06 11:14:06,034 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:06,035 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 41, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:06,035 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable234 [2021-05-06 11:14:06,035 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:06,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:06,035 INFO L82 PathProgramCache]: Analyzing trace with hash -223439442, now seen corresponding path program 49 times [2021-05-06 11:14:06,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:06,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429723320] [2021-05-06 11:14:06,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:06,055 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:14:06,056 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:06,057 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:06,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:06,072 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:06,095 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:14:06,110 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:06,113 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:14:06,124 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:06,125 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:06,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:06,136 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:06,143 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:14:06,154 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:06,155 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:06,157 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:14:06,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:06,158 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:06,166 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:06,167 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:06,180 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:14:06,190 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:06,193 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:14:06,194 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:06,195 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:06,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:06,208 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:06,227 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:14:06,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:06,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:06,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:06,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:06,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:06,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:14:06,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:10,629 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:10,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429723320] [2021-05-06 11:14:10,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1429723320] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:10,629 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:10,629 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [116] imperfect sequences [] total 116 [2021-05-06 11:14:10,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405209726] [2021-05-06 11:14:10,630 INFO L460 AbstractCegarLoop]: Interpolant automaton has 116 states [2021-05-06 11:14:10,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:10,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-05-06 11:14:10,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=13259, Unknown=0, NotChecked=0, Total=13572 [2021-05-06 11:14:10,631 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand has 116 states, 115 states have (on average 1.3652173913043477) internal successors, (157), 114 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:18,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:18,450 INFO L93 Difference]: Finished difference Result 175 states and 179 transitions. [2021-05-06 11:14:18,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-05-06 11:14:18,450 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 115 states have (on average 1.3652173913043477) internal successors, (157), 114 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2021-05-06 11:14:18,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:18,451 INFO L225 Difference]: With dead ends: 175 [2021-05-06 11:14:18,451 INFO L226 Difference]: Without dead ends: 167 [2021-05-06 11:14:18,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17197 ImplicationChecksByTransitivity, 8655.3ms TimeCoverageRelationStatistics Valid=884, Invalid=50418, Unknown=0, NotChecked=0, Total=51302 [2021-05-06 11:14:18,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-06 11:14:18,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2021-05-06 11:14:18,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.0124223602484472) internal successors, (163), 161 states have internal predecessors, (163), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:18,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2021-05-06 11:14:18,476 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 161 [2021-05-06 11:14:18,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:18,476 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2021-05-06 11:14:18,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 116 states, 115 states have (on average 1.3652173913043477) internal successors, (157), 114 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:18,476 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2021-05-06 11:14:18,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-05-06 11:14:18,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:18,477 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 42, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:18,477 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable239 [2021-05-06 11:14:18,477 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:18,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:18,477 INFO L82 PathProgramCache]: Analyzing trace with hash -255656343, now seen corresponding path program 50 times [2021-05-06 11:14:18,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:18,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1848089694] [2021-05-06 11:14:18,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:18,484 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:14:18,485 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:18,486 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:18,495 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:18,499 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:18,519 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:14:18,532 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:18,534 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:14:18,543 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:18,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:18,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:18,553 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:18,558 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:14:18,569 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:18,570 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:18,572 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:14:18,572 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:18,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:18,580 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:18,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:18,595 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:14:18,606 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:18,609 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:14:18,610 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:18,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:18,629 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:18,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:18,652 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:14:18,666 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:18,667 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:18,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:18,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:18,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:18,727 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:14:18,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:23,196 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:23,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1848089694] [2021-05-06 11:14:23,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1848089694] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:23,197 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:23,197 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [118] imperfect sequences [] total 118 [2021-05-06 11:14:23,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343717684] [2021-05-06 11:14:23,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 118 states [2021-05-06 11:14:23,197 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:23,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2021-05-06 11:14:23,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=13724, Unknown=0, NotChecked=0, Total=14042 [2021-05-06 11:14:23,198 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand has 118 states, 117 states have (on average 1.3675213675213675) internal successors, (160), 116 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:31,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:31,259 INFO L93 Difference]: Finished difference Result 178 states and 182 transitions. [2021-05-06 11:14:31,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2021-05-06 11:14:31,259 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 117 states have (on average 1.3675213675213675) internal successors, (160), 116 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 164 [2021-05-06 11:14:31,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:31,260 INFO L225 Difference]: With dead ends: 178 [2021-05-06 11:14:31,260 INFO L226 Difference]: Without dead ends: 170 [2021-05-06 11:14:31,262 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17808 ImplicationChecksByTransitivity, 8908.2ms TimeCoverageRelationStatistics Valid=899, Invalid=52231, Unknown=0, NotChecked=0, Total=53130 [2021-05-06 11:14:31,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-06 11:14:31,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-06 11:14:31,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0121951219512195) internal successors, (166), 164 states have internal predecessors, (166), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:31,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2021-05-06 11:14:31,282 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 164 [2021-05-06 11:14:31,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:31,282 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2021-05-06 11:14:31,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 118 states, 117 states have (on average 1.3675213675213675) internal successors, (160), 116 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:31,282 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2021-05-06 11:14:31,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-06 11:14:31,283 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:31,283 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 43, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:31,283 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable244 [2021-05-06 11:14:31,283 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:31,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:31,283 INFO L82 PathProgramCache]: Analyzing trace with hash 2043320270, now seen corresponding path program 51 times [2021-05-06 11:14:31,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:31,283 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35134469] [2021-05-06 11:14:31,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:31,298 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:14:31,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:31,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:31,325 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:31,330 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:31,341 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:14:31,357 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:31,360 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:14:31,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:31,373 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:31,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:31,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:31,390 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:14:31,403 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:31,404 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:31,406 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:14:31,407 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:31,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:31,416 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:31,418 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:31,434 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:14:31,446 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:31,450 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:14:31,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:31,452 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:31,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:31,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:31,492 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:14:31,506 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:31,507 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:31,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:31,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:31,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:31,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:14:31,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:36,284 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:36,284 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [35134469] [2021-05-06 11:14:36,284 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [35134469] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:36,284 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:36,288 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [120] imperfect sequences [] total 120 [2021-05-06 11:14:36,288 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100172856] [2021-05-06 11:14:36,288 INFO L460 AbstractCegarLoop]: Interpolant automaton has 120 states [2021-05-06 11:14:36,288 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:36,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2021-05-06 11:14:36,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=323, Invalid=14197, Unknown=0, NotChecked=0, Total=14520 [2021-05-06 11:14:36,289 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand has 120 states, 119 states have (on average 1.3697478991596639) internal successors, (163), 118 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:44,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:44,697 INFO L93 Difference]: Finished difference Result 181 states and 185 transitions. [2021-05-06 11:14:44,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-05-06 11:14:44,698 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 119 states have (on average 1.3697478991596639) internal successors, (163), 118 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2021-05-06 11:14:44,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:44,698 INFO L225 Difference]: With dead ends: 181 [2021-05-06 11:14:44,698 INFO L226 Difference]: Without dead ends: 173 [2021-05-06 11:14:44,700 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 233 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18429 ImplicationChecksByTransitivity, 9334.4ms TimeCoverageRelationStatistics Valid=914, Invalid=54076, Unknown=0, NotChecked=0, Total=54990 [2021-05-06 11:14:44,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-06 11:14:44,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2021-05-06 11:14:44,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0119760479041917) internal successors, (169), 167 states have internal predecessors, (169), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:44,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2021-05-06 11:14:44,730 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 167 [2021-05-06 11:14:44,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:44,731 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2021-05-06 11:14:44,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 120 states, 119 states have (on average 1.3697478991596639) internal successors, (163), 118 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:44,731 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2021-05-06 11:14:44,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-05-06 11:14:44,731 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:44,731 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 44, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:44,731 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable249 [2021-05-06 11:14:44,732 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:44,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:44,732 INFO L82 PathProgramCache]: Analyzing trace with hash -987871159, now seen corresponding path program 52 times [2021-05-06 11:14:44,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:44,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1900177043] [2021-05-06 11:14:44,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:44,739 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:14:44,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:44,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:44,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:44,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:44,774 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:14:44,788 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:44,790 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:14:44,791 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:44,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:44,799 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:44,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:44,814 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:14:44,824 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:44,825 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:44,827 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:14:44,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:44,842 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:44,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:44,852 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:44,858 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:14:44,869 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:44,872 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:14:44,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:44,884 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:44,894 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:44,897 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:44,907 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:14:44,920 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:44,921 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:44,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:44,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:44,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:44,997 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:14:44,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:14:49,885 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:49,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1900177043] [2021-05-06 11:14:49,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1900177043] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:49,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:49,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [122] imperfect sequences [] total 122 [2021-05-06 11:14:49,886 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017017655] [2021-05-06 11:14:49,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 122 states [2021-05-06 11:14:49,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:49,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2021-05-06 11:14:49,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=14678, Unknown=0, NotChecked=0, Total=15006 [2021-05-06 11:14:49,887 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand has 122 states, 121 states have (on average 1.371900826446281) internal successors, (166), 120 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:58,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:58,447 INFO L93 Difference]: Finished difference Result 184 states and 188 transitions. [2021-05-06 11:14:58,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2021-05-06 11:14:58,448 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 121 states have (on average 1.371900826446281) internal successors, (166), 120 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 170 [2021-05-06 11:14:58,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:58,449 INFO L225 Difference]: With dead ends: 184 [2021-05-06 11:14:58,449 INFO L226 Difference]: Without dead ends: 176 [2021-05-06 11:14:58,451 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 237 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19060 ImplicationChecksByTransitivity, 9575.0ms TimeCoverageRelationStatistics Valid=929, Invalid=55953, Unknown=0, NotChecked=0, Total=56882 [2021-05-06 11:14:58,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-05-06 11:14:58,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2021-05-06 11:14:58,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 170 states have (on average 1.011764705882353) internal successors, (172), 170 states have internal predecessors, (172), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:58,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2021-05-06 11:14:58,474 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 170 [2021-05-06 11:14:58,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:58,474 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2021-05-06 11:14:58,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 122 states, 121 states have (on average 1.371900826446281) internal successors, (166), 120 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:14:58,474 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2021-05-06 11:14:58,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-05-06 11:14:58,475 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:58,475 INFO L523 BasicCegarLoop]: trace histogram [54, 54, 45, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:58,475 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable254 [2021-05-06 11:14:58,475 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:58,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:58,475 INFO L82 PathProgramCache]: Analyzing trace with hash -1524334098, now seen corresponding path program 53 times [2021-05-06 11:14:58,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:58,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173483373] [2021-05-06 11:14:58,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:58,483 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:14:58,484 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,489 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,501 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:58,506 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:58,527 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:14:58,543 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:58,546 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:14:58,547 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,557 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:14:58,559 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:14:58,574 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:14:58,587 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:58,588 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:58,590 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:14:58,591 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:58,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:58,620 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:14:58,632 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:58,636 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:14:58,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:14:58,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:14:58,683 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:14:58,695 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:14:58,711 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:14:58,713 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:14:58,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:58,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:58,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:58,780 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:14:58,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:03,744 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:03,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173483373] [2021-05-06 11:15:03,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [173483373] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:03,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:03,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [124] imperfect sequences [] total 124 [2021-05-06 11:15:03,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752007518] [2021-05-06 11:15:03,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 124 states [2021-05-06 11:15:03,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:03,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2021-05-06 11:15:03,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=15167, Unknown=0, NotChecked=0, Total=15500 [2021-05-06 11:15:03,746 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand has 124 states, 123 states have (on average 1.3739837398373984) internal successors, (169), 122 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:12,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:12,674 INFO L93 Difference]: Finished difference Result 187 states and 191 transitions. [2021-05-06 11:15:12,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2021-05-06 11:15:12,675 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 123 states have (on average 1.3739837398373984) internal successors, (169), 122 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 173 [2021-05-06 11:15:12,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:12,675 INFO L225 Difference]: With dead ends: 187 [2021-05-06 11:15:12,675 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 11:15:12,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19701 ImplicationChecksByTransitivity, 9862.3ms TimeCoverageRelationStatistics Valid=944, Invalid=57862, Unknown=0, NotChecked=0, Total=58806 [2021-05-06 11:15:12,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 11:15:12,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2021-05-06 11:15:12,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0115606936416186) internal successors, (175), 173 states have internal predecessors, (175), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:12,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2021-05-06 11:15:12,702 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 173 [2021-05-06 11:15:12,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:12,702 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2021-05-06 11:15:12,702 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 124 states, 123 states have (on average 1.3739837398373984) internal successors, (169), 122 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:12,702 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2021-05-06 11:15:12,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-06 11:15:12,703 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:12,703 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 46, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:12,703 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable259 [2021-05-06 11:15:12,703 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:12,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:12,704 INFO L82 PathProgramCache]: Analyzing trace with hash -1718441431, now seen corresponding path program 54 times [2021-05-06 11:15:12,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:12,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319062809] [2021-05-06 11:15:12,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:12,710 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:15:12,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:12,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:12,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:12,725 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:12,744 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:15:12,758 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:12,760 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:15:12,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:12,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:12,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:12,779 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:12,785 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:15:12,795 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:12,796 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:12,797 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:15:12,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:12,818 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:12,825 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:12,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:12,833 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:15:12,843 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:12,846 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:15:12,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:12,859 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:12,868 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:12,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:12,881 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:15:12,895 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:12,895 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:12,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:12,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:12,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:12,957 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:15:12,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:18,021 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:18,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319062809] [2021-05-06 11:15:18,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1319062809] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:18,022 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:18,022 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [126] imperfect sequences [] total 126 [2021-05-06 11:15:18,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470431890] [2021-05-06 11:15:18,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 126 states [2021-05-06 11:15:18,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:18,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2021-05-06 11:15:18,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=15664, Unknown=0, NotChecked=0, Total=16002 [2021-05-06 11:15:18,023 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand has 126 states, 125 states have (on average 1.376) internal successors, (172), 124 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:27,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:27,135 INFO L93 Difference]: Finished difference Result 190 states and 194 transitions. [2021-05-06 11:15:27,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-05-06 11:15:27,135 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 125 states have (on average 1.376) internal successors, (172), 124 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 176 [2021-05-06 11:15:27,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:27,136 INFO L225 Difference]: With dead ends: 190 [2021-05-06 11:15:27,136 INFO L226 Difference]: Without dead ends: 182 [2021-05-06 11:15:27,138 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20352 ImplicationChecksByTransitivity, 10057.2ms TimeCoverageRelationStatistics Valid=959, Invalid=59803, Unknown=0, NotChecked=0, Total=60762 [2021-05-06 11:15:27,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-06 11:15:27,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-06 11:15:27,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0113636363636365) internal successors, (178), 176 states have internal predecessors, (178), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:27,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 182 transitions. [2021-05-06 11:15:27,174 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 182 transitions. Word has length 176 [2021-05-06 11:15:27,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:27,174 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 182 transitions. [2021-05-06 11:15:27,174 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 126 states, 125 states have (on average 1.376) internal successors, (172), 124 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:27,174 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 182 transitions. [2021-05-06 11:15:27,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-06 11:15:27,175 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:27,175 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 47, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:27,175 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable264 [2021-05-06 11:15:27,176 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:27,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:27,176 INFO L82 PathProgramCache]: Analyzing trace with hash 950948878, now seen corresponding path program 55 times [2021-05-06 11:15:27,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:27,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1452884064] [2021-05-06 11:15:27,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:27,183 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:15:27,197 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:27,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:27,210 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:27,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:27,225 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:15:27,241 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:27,244 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:15:27,278 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:27,285 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:27,295 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:27,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:27,304 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:15:27,316 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:27,317 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:27,319 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:15:27,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:27,331 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:27,340 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:27,342 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:27,349 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:15:27,361 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:27,365 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:15:27,365 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:27,367 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:27,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:27,383 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:27,405 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:15:27,421 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:27,422 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:27,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:27,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:27,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:27,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:15:27,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:32,722 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:32,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1452884064] [2021-05-06 11:15:32,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1452884064] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:32,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:32,722 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [128] imperfect sequences [] total 128 [2021-05-06 11:15:32,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296476080] [2021-05-06 11:15:32,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 128 states [2021-05-06 11:15:32,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:32,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2021-05-06 11:15:32,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=16169, Unknown=0, NotChecked=0, Total=16512 [2021-05-06 11:15:32,724 INFO L87 Difference]: Start difference. First operand 181 states and 182 transitions. Second operand has 128 states, 127 states have (on average 1.3779527559055118) internal successors, (175), 126 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:42,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:42,127 INFO L93 Difference]: Finished difference Result 193 states and 197 transitions. [2021-05-06 11:15:42,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2021-05-06 11:15:42,128 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 127 states have (on average 1.3779527559055118) internal successors, (175), 126 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2021-05-06 11:15:42,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:42,128 INFO L225 Difference]: With dead ends: 193 [2021-05-06 11:15:42,128 INFO L226 Difference]: Without dead ends: 185 [2021-05-06 11:15:42,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 249 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21013 ImplicationChecksByTransitivity, 10374.0ms TimeCoverageRelationStatistics Valid=974, Invalid=61776, Unknown=0, NotChecked=0, Total=62750 [2021-05-06 11:15:42,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-06 11:15:42,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-06 11:15:42,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.011173184357542) internal successors, (181), 179 states have internal predecessors, (181), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:42,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2021-05-06 11:15:42,165 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 179 [2021-05-06 11:15:42,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:42,165 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2021-05-06 11:15:42,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 128 states, 127 states have (on average 1.3779527559055118) internal successors, (175), 126 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:42,165 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2021-05-06 11:15:42,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-06 11:15:42,166 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:42,166 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 48, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:42,166 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable269 [2021-05-06 11:15:42,166 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:42,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:42,167 INFO L82 PathProgramCache]: Analyzing trace with hash -856808439, now seen corresponding path program 56 times [2021-05-06 11:15:42,167 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:42,167 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [963601569] [2021-05-06 11:15:42,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:42,175 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:15:42,176 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:42,177 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:42,190 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:42,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:42,218 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:15:42,233 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:42,236 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:15:42,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:42,241 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:42,250 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:42,252 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:42,266 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:15:42,276 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:42,277 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:42,279 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:15:42,280 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:42,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:42,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:42,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:42,302 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:15:42,313 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:42,316 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:15:42,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:42,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:42,327 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:42,331 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:42,350 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:15:42,384 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:42,385 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:42,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:42,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:42,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:42,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:15:42,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:15:47,940 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:47,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [963601569] [2021-05-06 11:15:47,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [963601569] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:47,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:47,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [130] imperfect sequences [] total 130 [2021-05-06 11:15:47,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945793376] [2021-05-06 11:15:47,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 130 states [2021-05-06 11:15:47,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:47,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2021-05-06 11:15:47,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=348, Invalid=16682, Unknown=0, NotChecked=0, Total=17030 [2021-05-06 11:15:47,942 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand has 130 states, 129 states have (on average 1.37984496124031) internal successors, (178), 128 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:57,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:57,572 INFO L93 Difference]: Finished difference Result 196 states and 200 transitions. [2021-05-06 11:15:57,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2021-05-06 11:15:57,573 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 129 states have (on average 1.37984496124031) internal successors, (178), 128 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 182 [2021-05-06 11:15:57,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:57,573 INFO L225 Difference]: With dead ends: 196 [2021-05-06 11:15:57,574 INFO L226 Difference]: Without dead ends: 188 [2021-05-06 11:15:57,576 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 253 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21684 ImplicationChecksByTransitivity, 10770.0ms TimeCoverageRelationStatistics Valid=989, Invalid=63781, Unknown=0, NotChecked=0, Total=64770 [2021-05-06 11:15:57,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-05-06 11:15:57,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 187. [2021-05-06 11:15:57,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 182 states have (on average 1.010989010989011) internal successors, (184), 182 states have internal predecessors, (184), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:57,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2021-05-06 11:15:57,612 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 182 [2021-05-06 11:15:57,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:57,612 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2021-05-06 11:15:57,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 130 states, 129 states have (on average 1.37984496124031) internal successors, (178), 128 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:15:57,612 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2021-05-06 11:15:57,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-05-06 11:15:57,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:57,613 INFO L523 BasicCegarLoop]: trace histogram [58, 58, 49, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:57,613 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable274 [2021-05-06 11:15:57,613 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:57,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:57,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1160114642, now seen corresponding path program 57 times [2021-05-06 11:15:57,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:57,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533153247] [2021-05-06 11:15:57,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:57,622 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:15:57,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:57,636 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:57,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:57,649 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:57,659 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:15:57,672 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:57,674 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:15:57,675 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:57,676 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:57,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:15:57,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:15:57,697 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:15:57,707 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:57,708 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:57,710 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:15:57,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:57,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:57,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:57,720 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:57,738 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:15:57,748 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:57,751 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:15:57,763 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:57,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:15:57,774 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:15:57,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:15:57,787 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:15:57,801 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:15:57,802 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:15:57,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:57,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:57,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:57,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:15:57,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:16:03,412 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:03,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533153247] [2021-05-06 11:16:03,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1533153247] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:03,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:03,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [132] imperfect sequences [] total 132 [2021-05-06 11:16:03,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192384013] [2021-05-06 11:16:03,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 132 states [2021-05-06 11:16:03,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:03,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-05-06 11:16:03,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=17203, Unknown=0, NotChecked=0, Total=17556 [2021-05-06 11:16:03,414 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand has 132 states, 131 states have (on average 1.381679389312977) internal successors, (181), 130 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:13,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:13,382 INFO L93 Difference]: Finished difference Result 199 states and 203 transitions. [2021-05-06 11:16:13,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2021-05-06 11:16:13,384 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 131 states have (on average 1.381679389312977) internal successors, (181), 130 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 185 [2021-05-06 11:16:13,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:13,385 INFO L225 Difference]: With dead ends: 199 [2021-05-06 11:16:13,385 INFO L226 Difference]: Without dead ends: 191 [2021-05-06 11:16:13,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 257 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22365 ImplicationChecksByTransitivity, 10947.0ms TimeCoverageRelationStatistics Valid=1004, Invalid=65818, Unknown=0, NotChecked=0, Total=66822 [2021-05-06 11:16:13,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-06 11:16:13,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2021-05-06 11:16:13,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0108108108108107) internal successors, (187), 185 states have internal predecessors, (187), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:13,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2021-05-06 11:16:13,413 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 185 [2021-05-06 11:16:13,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:13,413 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2021-05-06 11:16:13,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 132 states, 131 states have (on average 1.381679389312977) internal successors, (181), 130 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:13,413 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2021-05-06 11:16:13,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-06 11:16:13,414 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:13,414 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 50, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:13,414 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable279 [2021-05-06 11:16:13,414 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:13,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:13,414 INFO L82 PathProgramCache]: Analyzing trace with hash -344017431, now seen corresponding path program 58 times [2021-05-06 11:16:13,414 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:13,414 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [149272747] [2021-05-06 11:16:13,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:13,420 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:16:13,421 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:13,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:13,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:13,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:13,457 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:16:13,470 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:13,473 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:16:13,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:13,482 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:13,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:13,491 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:13,497 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:16:13,508 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:13,508 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:13,510 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:16:13,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:13,520 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:13,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:13,529 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:13,535 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:16:13,546 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:13,560 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:16:13,572 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:13,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:13,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:13,586 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:13,596 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:16:13,609 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:13,610 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:13,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:13,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:13,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:13,698 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:16:13,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:16:19,477 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:19,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [149272747] [2021-05-06 11:16:19,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [149272747] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:19,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:19,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [134] imperfect sequences [] total 134 [2021-05-06 11:16:19,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093472945] [2021-05-06 11:16:19,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 134 states [2021-05-06 11:16:19,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:19,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2021-05-06 11:16:19,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=17732, Unknown=0, NotChecked=0, Total=18090 [2021-05-06 11:16:19,479 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand has 134 states, 133 states have (on average 1.3834586466165413) internal successors, (184), 132 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:29,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:29,631 INFO L93 Difference]: Finished difference Result 202 states and 206 transitions. [2021-05-06 11:16:29,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2021-05-06 11:16:29,631 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 133 states have (on average 1.3834586466165413) internal successors, (184), 132 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 188 [2021-05-06 11:16:29,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:29,632 INFO L225 Difference]: With dead ends: 202 [2021-05-06 11:16:29,632 INFO L226 Difference]: Without dead ends: 194 [2021-05-06 11:16:29,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23056 ImplicationChecksByTransitivity, 11320.2ms TimeCoverageRelationStatistics Valid=1019, Invalid=67887, Unknown=0, NotChecked=0, Total=68906 [2021-05-06 11:16:29,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-06 11:16:29,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-05-06 11:16:29,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0106382978723405) internal successors, (190), 188 states have internal predecessors, (190), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:29,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 194 transitions. [2021-05-06 11:16:29,673 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 194 transitions. Word has length 188 [2021-05-06 11:16:29,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:29,673 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 194 transitions. [2021-05-06 11:16:29,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 134 states, 133 states have (on average 1.3834586466165413) internal successors, (184), 132 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:29,673 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 194 transitions. [2021-05-06 11:16:29,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-06 11:16:29,674 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:29,674 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 51, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:29,674 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable284 [2021-05-06 11:16:29,674 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:29,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:29,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1801867186, now seen corresponding path program 59 times [2021-05-06 11:16:29,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:29,675 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [580172317] [2021-05-06 11:16:29,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:29,683 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:16:29,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:29,700 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:29,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:29,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:29,723 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:16:29,736 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:29,738 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:16:29,747 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:29,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:29,758 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:29,760 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:29,765 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:16:29,776 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:29,776 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:29,794 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:16:29,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:29,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:29,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:29,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:29,823 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:16:29,833 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:29,836 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:16:29,848 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:29,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:29,858 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:29,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:29,871 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:16:29,884 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:29,885 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:29,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:29,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:29,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:29,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:16:29,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:16:35,931 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:35,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [580172317] [2021-05-06 11:16:35,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [580172317] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:35,932 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:35,932 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [136] imperfect sequences [] total 136 [2021-05-06 11:16:35,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548809096] [2021-05-06 11:16:35,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 136 states [2021-05-06 11:16:35,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:35,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-05-06 11:16:35,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=18269, Unknown=0, NotChecked=0, Total=18632 [2021-05-06 11:16:35,933 INFO L87 Difference]: Start difference. First operand 193 states and 194 transitions. Second operand has 136 states, 135 states have (on average 1.385185185185185) internal successors, (187), 134 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:46,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:46,497 INFO L93 Difference]: Finished difference Result 205 states and 209 transitions. [2021-05-06 11:16:46,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2021-05-06 11:16:46,498 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 135 states have (on average 1.385185185185185) internal successors, (187), 134 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 191 [2021-05-06 11:16:46,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:46,499 INFO L225 Difference]: With dead ends: 205 [2021-05-06 11:16:46,499 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 11:16:46,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 265 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23757 ImplicationChecksByTransitivity, 11734.0ms TimeCoverageRelationStatistics Valid=1034, Invalid=69988, Unknown=0, NotChecked=0, Total=71022 [2021-05-06 11:16:46,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 11:16:46,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2021-05-06 11:16:46,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.0104712041884816) internal successors, (193), 191 states have internal predecessors, (193), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:46,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 197 transitions. [2021-05-06 11:16:46,535 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 197 transitions. Word has length 191 [2021-05-06 11:16:46,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:46,535 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 197 transitions. [2021-05-06 11:16:46,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 136 states, 135 states have (on average 1.385185185185185) internal successors, (187), 134 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:46,536 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 197 transitions. [2021-05-06 11:16:46,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-05-06 11:16:46,536 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:46,536 INFO L523 BasicCegarLoop]: trace histogram [61, 61, 52, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:46,537 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable289 [2021-05-06 11:16:46,537 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:46,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:46,537 INFO L82 PathProgramCache]: Analyzing trace with hash -1894621239, now seen corresponding path program 60 times [2021-05-06 11:16:46,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:46,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612754838] [2021-05-06 11:16:46,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:46,544 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:16:46,557 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:46,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:46,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:46,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:46,582 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:16:46,596 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:46,599 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:16:46,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:46,600 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:46,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:16:46,610 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:16:46,623 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:16:46,634 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:46,635 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:46,640 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:16:46,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:46,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:46,658 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:46,660 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:46,666 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:16:46,677 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:46,680 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:16:46,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:46,693 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:16:46,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:16:46,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:16:46,716 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:16:46,730 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:16:46,731 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:16:46,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:46,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:46,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:46,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:16:46,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:16:52,942 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:52,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612754838] [2021-05-06 11:16:52,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [612754838] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:52,942 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:52,942 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [138] imperfect sequences [] total 138 [2021-05-06 11:16:52,942 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86874099] [2021-05-06 11:16:52,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 138 states [2021-05-06 11:16:52,943 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:52,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2021-05-06 11:16:52,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=368, Invalid=18814, Unknown=0, NotChecked=0, Total=19182 [2021-05-06 11:16:52,944 INFO L87 Difference]: Start difference. First operand 196 states and 197 transitions. Second operand has 138 states, 137 states have (on average 1.3868613138686132) internal successors, (190), 136 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:03,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:03,715 INFO L93 Difference]: Finished difference Result 208 states and 212 transitions. [2021-05-06 11:17:03,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-05-06 11:17:03,715 INFO L78 Accepts]: Start accepts. Automaton has has 138 states, 137 states have (on average 1.3868613138686132) internal successors, (190), 136 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 194 [2021-05-06 11:17:03,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:03,716 INFO L225 Difference]: With dead ends: 208 [2021-05-06 11:17:03,716 INFO L226 Difference]: Without dead ends: 200 [2021-05-06 11:17:03,718 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24468 ImplicationChecksByTransitivity, 11984.4ms TimeCoverageRelationStatistics Valid=1049, Invalid=72121, Unknown=0, NotChecked=0, Total=73170 [2021-05-06 11:17:03,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-06 11:17:03,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2021-05-06 11:17:03,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.0103092783505154) internal successors, (196), 194 states have internal predecessors, (196), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:03,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2021-05-06 11:17:03,755 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 194 [2021-05-06 11:17:03,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:03,756 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2021-05-06 11:17:03,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 138 states, 137 states have (on average 1.3868613138686132) internal successors, (190), 136 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:03,756 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2021-05-06 11:17:03,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-05-06 11:17:03,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:03,757 INFO L523 BasicCegarLoop]: trace histogram [62, 62, 53, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:03,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable294 [2021-05-06 11:17:03,757 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:03,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:03,757 INFO L82 PathProgramCache]: Analyzing trace with hash 828324462, now seen corresponding path program 61 times [2021-05-06 11:17:03,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:03,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167296216] [2021-05-06 11:17:03,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:03,765 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:17:03,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:03,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:03,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:03,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:03,800 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:17:03,813 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:03,815 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:17:03,816 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:03,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:03,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:03,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:03,838 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:17:03,849 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:03,849 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:03,851 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:17:03,860 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:03,861 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:03,867 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:03,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:03,875 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:17:03,885 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:03,888 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:17:03,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:03,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:03,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:03,913 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:03,923 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:17:03,936 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:03,937 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:03,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:03,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:03,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:03,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:17:03,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:17:10,287 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:10,287 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167296216] [2021-05-06 11:17:10,287 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1167296216] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:10,287 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:10,287 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [140] imperfect sequences [] total 140 [2021-05-06 11:17:10,287 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618902167] [2021-05-06 11:17:10,288 INFO L460 AbstractCegarLoop]: Interpolant automaton has 140 states [2021-05-06 11:17:10,288 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:10,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2021-05-06 11:17:10,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=19367, Unknown=0, NotChecked=0, Total=19740 [2021-05-06 11:17:10,289 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand has 140 states, 139 states have (on average 1.3884892086330936) internal successors, (193), 138 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:21,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:21,427 INFO L93 Difference]: Finished difference Result 211 states and 215 transitions. [2021-05-06 11:17:21,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-05-06 11:17:21,428 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 139 states have (on average 1.3884892086330936) internal successors, (193), 138 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 197 [2021-05-06 11:17:21,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:21,428 INFO L225 Difference]: With dead ends: 211 [2021-05-06 11:17:21,428 INFO L226 Difference]: Without dead ends: 203 [2021-05-06 11:17:21,431 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 273 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25189 ImplicationChecksByTransitivity, 12315.7ms TimeCoverageRelationStatistics Valid=1064, Invalid=74286, Unknown=0, NotChecked=0, Total=75350 [2021-05-06 11:17:21,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-05-06 11:17:21,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2021-05-06 11:17:21,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 197 states have (on average 1.0101522842639594) internal successors, (199), 197 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:21,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2021-05-06 11:17:21,476 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 197 [2021-05-06 11:17:21,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:21,476 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2021-05-06 11:17:21,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 140 states, 139 states have (on average 1.3884892086330936) internal successors, (193), 138 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:21,477 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2021-05-06 11:17:21,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-05-06 11:17:21,478 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:21,478 INFO L523 BasicCegarLoop]: trace histogram [63, 63, 54, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:21,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable299 [2021-05-06 11:17:21,478 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:21,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:21,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1056383401, now seen corresponding path program 62 times [2021-05-06 11:17:21,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:21,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1743592742] [2021-05-06 11:17:21,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:21,487 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:17:21,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:21,499 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:21,509 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:21,512 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:21,522 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:17:21,535 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:21,540 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:17:21,540 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:21,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:21,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:21,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:21,580 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:17:21,593 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:21,594 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:21,597 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:17:21,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:21,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:21,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:21,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:21,622 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:17:21,632 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:21,635 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:17:21,646 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:21,647 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:21,657 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:21,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:21,670 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:17:21,683 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:21,684 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:21,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:21,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:21,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:21,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:17:21,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:17:28,128 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:28,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1743592742] [2021-05-06 11:17:28,129 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1743592742] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:28,129 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:28,129 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [142] imperfect sequences [] total 142 [2021-05-06 11:17:28,129 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659552450] [2021-05-06 11:17:28,129 INFO L460 AbstractCegarLoop]: Interpolant automaton has 142 states [2021-05-06 11:17:28,129 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:28,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2021-05-06 11:17:28,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=19928, Unknown=0, NotChecked=0, Total=20306 [2021-05-06 11:17:28,130 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand has 142 states, 141 states have (on average 1.3900709219858156) internal successors, (196), 140 states have internal predecessors, (196), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:39,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:39,530 INFO L93 Difference]: Finished difference Result 214 states and 218 transitions. [2021-05-06 11:17:39,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-05-06 11:17:39,530 INFO L78 Accepts]: Start accepts. Automaton has has 142 states, 141 states have (on average 1.3900709219858156) internal successors, (196), 140 states have internal predecessors, (196), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 200 [2021-05-06 11:17:39,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:39,531 INFO L225 Difference]: With dead ends: 214 [2021-05-06 11:17:39,531 INFO L226 Difference]: Without dead ends: 206 [2021-05-06 11:17:39,533 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 277 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25920 ImplicationChecksByTransitivity, 12554.5ms TimeCoverageRelationStatistics Valid=1079, Invalid=76483, Unknown=0, NotChecked=0, Total=77562 [2021-05-06 11:17:39,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-06 11:17:39,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2021-05-06 11:17:39,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.01) internal successors, (202), 200 states have internal predecessors, (202), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:39,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 206 transitions. [2021-05-06 11:17:39,580 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 206 transitions. Word has length 200 [2021-05-06 11:17:39,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:39,580 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 206 transitions. [2021-05-06 11:17:39,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 142 states, 141 states have (on average 1.3900709219858156) internal successors, (196), 140 states have internal predecessors, (196), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:39,580 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 206 transitions. [2021-05-06 11:17:39,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-05-06 11:17:39,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:39,581 INFO L523 BasicCegarLoop]: trace histogram [64, 64, 55, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:39,581 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable304 [2021-05-06 11:17:39,581 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:39,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:39,582 INFO L82 PathProgramCache]: Analyzing trace with hash 521972878, now seen corresponding path program 63 times [2021-05-06 11:17:39,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:39,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498030708] [2021-05-06 11:17:39,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:39,599 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:17:39,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:39,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:39,629 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:39,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:39,646 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:17:39,663 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:39,666 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:17:39,666 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:39,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:39,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:39,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:39,694 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:17:39,708 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:39,708 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:39,711 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:17:39,722 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:39,723 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:39,732 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:39,735 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:39,741 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:17:39,754 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:39,757 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:17:39,758 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:39,759 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:39,772 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:39,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:39,798 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:17:39,813 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:39,814 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:39,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:39,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:39,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:39,872 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:17:39,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:17:46,654 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:46,654 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498030708] [2021-05-06 11:17:46,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [498030708] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:46,654 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:46,654 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [144] imperfect sequences [] total 144 [2021-05-06 11:17:46,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162392929] [2021-05-06 11:17:46,655 INFO L460 AbstractCegarLoop]: Interpolant automaton has 144 states [2021-05-06 11:17:46,655 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:46,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2021-05-06 11:17:46,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=20497, Unknown=0, NotChecked=0, Total=20880 [2021-05-06 11:17:46,656 INFO L87 Difference]: Start difference. First operand 205 states and 206 transitions. Second operand has 144 states, 143 states have (on average 1.3916083916083917) internal successors, (199), 142 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:58,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:58,522 INFO L93 Difference]: Finished difference Result 217 states and 221 transitions. [2021-05-06 11:17:58,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2021-05-06 11:17:58,522 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 143 states have (on average 1.3916083916083917) internal successors, (199), 142 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 203 [2021-05-06 11:17:58,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:58,523 INFO L225 Difference]: With dead ends: 217 [2021-05-06 11:17:58,523 INFO L226 Difference]: Without dead ends: 209 [2021-05-06 11:17:58,525 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 281 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26661 ImplicationChecksByTransitivity, 13254.6ms TimeCoverageRelationStatistics Valid=1094, Invalid=78712, Unknown=0, NotChecked=0, Total=79806 [2021-05-06 11:17:58,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-06 11:17:58,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 208. [2021-05-06 11:17:58,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 203 states have (on average 1.0098522167487685) internal successors, (205), 203 states have internal predecessors, (205), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:58,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 209 transitions. [2021-05-06 11:17:58,556 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 209 transitions. Word has length 203 [2021-05-06 11:17:58,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:58,556 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 209 transitions. [2021-05-06 11:17:58,556 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 144 states, 143 states have (on average 1.3916083916083917) internal successors, (199), 142 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:17:58,556 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 209 transitions. [2021-05-06 11:17:58,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-05-06 11:17:58,557 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:58,557 INFO L523 BasicCegarLoop]: trace histogram [65, 65, 56, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:58,557 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable309 [2021-05-06 11:17:58,557 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:58,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:58,557 INFO L82 PathProgramCache]: Analyzing trace with hash 1341848457, now seen corresponding path program 64 times [2021-05-06 11:17:58,557 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:58,557 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641889581] [2021-05-06 11:17:58,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:58,563 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:17:58,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,576 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:58,589 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:58,598 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:17:58,612 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:58,614 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:17:58,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:17:58,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:17:58,637 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:17:58,647 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:58,648 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:58,652 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:17:58,653 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,654 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:58,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:58,676 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:17:58,686 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:58,689 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:17:58,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:17:58,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:17:58,715 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:17:58,725 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:17:58,738 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:17:58,739 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:17:58,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:58,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:58,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:58,801 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:17:58,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:18:05,584 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:05,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641889581] [2021-05-06 11:18:05,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1641889581] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:05,584 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:05,584 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [146] imperfect sequences [] total 146 [2021-05-06 11:18:05,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770217984] [2021-05-06 11:18:05,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 146 states [2021-05-06 11:18:05,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:05,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2021-05-06 11:18:05,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=21074, Unknown=0, NotChecked=0, Total=21462 [2021-05-06 11:18:05,585 INFO L87 Difference]: Start difference. First operand 208 states and 209 transitions. Second operand has 146 states, 145 states have (on average 1.393103448275862) internal successors, (202), 144 states have internal predecessors, (202), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:17,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:17,562 INFO L93 Difference]: Finished difference Result 220 states and 224 transitions. [2021-05-06 11:18:17,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 143 states. [2021-05-06 11:18:17,562 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 145 states have (on average 1.393103448275862) internal successors, (202), 144 states have internal predecessors, (202), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 206 [2021-05-06 11:18:17,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:17,563 INFO L225 Difference]: With dead ends: 220 [2021-05-06 11:18:17,563 INFO L226 Difference]: Without dead ends: 212 [2021-05-06 11:18:17,565 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 285 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27412 ImplicationChecksByTransitivity, 13266.5ms TimeCoverageRelationStatistics Valid=1109, Invalid=80973, Unknown=0, NotChecked=0, Total=82082 [2021-05-06 11:18:17,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-06 11:18:17,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2021-05-06 11:18:17,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.0097087378640777) internal successors, (208), 206 states have internal predecessors, (208), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:17,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 212 transitions. [2021-05-06 11:18:17,612 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 212 transitions. Word has length 206 [2021-05-06 11:18:17,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:17,612 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 212 transitions. [2021-05-06 11:18:17,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 146 states, 145 states have (on average 1.393103448275862) internal successors, (202), 144 states have internal predecessors, (202), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:17,612 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 212 transitions. [2021-05-06 11:18:17,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-05-06 11:18:17,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:17,613 INFO L523 BasicCegarLoop]: trace histogram [66, 66, 57, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:17,613 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable314 [2021-05-06 11:18:17,613 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:17,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:17,614 INFO L82 PathProgramCache]: Analyzing trace with hash 776210094, now seen corresponding path program 65 times [2021-05-06 11:18:17,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:17,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541020978] [2021-05-06 11:18:17,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:17,621 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:18:17,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:17,636 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:17,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:17,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:17,663 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:18:17,678 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:17,681 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:18:17,682 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:17,683 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:17,692 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:17,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:17,706 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:18:17,717 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:17,717 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:17,719 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:18:17,720 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:17,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:17,727 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:18:17,729 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:18:17,742 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:18:17,753 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:17,755 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:18:17,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:17,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:17,778 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:18:17,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:18:17,791 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:18:17,819 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:17,820 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:17,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:17,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:17,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:17,889 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:18:17,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:18:24,955 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:24,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541020978] [2021-05-06 11:18:24,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1541020978] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:24,955 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:24,955 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [148] imperfect sequences [] total 148 [2021-05-06 11:18:24,955 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791670114] [2021-05-06 11:18:24,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 148 states [2021-05-06 11:18:24,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:24,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2021-05-06 11:18:24,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=21659, Unknown=0, NotChecked=0, Total=22052 [2021-05-06 11:18:24,957 INFO L87 Difference]: Start difference. First operand 211 states and 212 transitions. Second operand has 148 states, 147 states have (on average 1.3945578231292517) internal successors, (205), 146 states have internal predecessors, (205), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:37,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:37,277 INFO L93 Difference]: Finished difference Result 223 states and 227 transitions. [2021-05-06 11:18:37,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2021-05-06 11:18:37,278 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 147 states have (on average 1.3945578231292517) internal successors, (205), 146 states have internal predecessors, (205), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 209 [2021-05-06 11:18:37,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:37,279 INFO L225 Difference]: With dead ends: 223 [2021-05-06 11:18:37,279 INFO L226 Difference]: Without dead ends: 215 [2021-05-06 11:18:37,281 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 289 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28173 ImplicationChecksByTransitivity, 13672.0ms TimeCoverageRelationStatistics Valid=1124, Invalid=83266, Unknown=0, NotChecked=0, Total=84390 [2021-05-06 11:18:37,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-05-06 11:18:37,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2021-05-06 11:18:37,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 209 states have (on average 1.0095693779904307) internal successors, (211), 209 states have internal predecessors, (211), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:37,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 215 transitions. [2021-05-06 11:18:37,321 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 215 transitions. Word has length 209 [2021-05-06 11:18:37,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:37,321 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 215 transitions. [2021-05-06 11:18:37,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 148 states, 147 states have (on average 1.3945578231292517) internal successors, (205), 146 states have internal predecessors, (205), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:37,321 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 215 transitions. [2021-05-06 11:18:37,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-05-06 11:18:37,322 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:37,322 INFO L523 BasicCegarLoop]: trace histogram [67, 67, 58, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:37,322 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable319 [2021-05-06 11:18:37,322 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:37,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:37,323 INFO L82 PathProgramCache]: Analyzing trace with hash -999559831, now seen corresponding path program 66 times [2021-05-06 11:18:37,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:37,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1717107336] [2021-05-06 11:18:37,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:37,343 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:18:37,355 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:37,356 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:37,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:37,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:37,379 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:18:37,392 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:37,396 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:18:37,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:37,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:37,406 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:37,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:37,421 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:18:37,432 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:37,433 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:37,449 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:18:37,459 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:37,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:37,466 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:18:37,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:18:37,474 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:18:37,484 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:37,493 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:18:37,494 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:37,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:37,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:18:37,509 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:18:37,527 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:18:37,541 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:37,543 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:37,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:37,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:37,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:37,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:18:37,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:18:44,827 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:44,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1717107336] [2021-05-06 11:18:44,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1717107336] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:44,827 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:44,827 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [150] imperfect sequences [] total 150 [2021-05-06 11:18:44,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36929183] [2021-05-06 11:18:44,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 150 states [2021-05-06 11:18:44,828 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:44,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2021-05-06 11:18:44,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=22252, Unknown=0, NotChecked=0, Total=22650 [2021-05-06 11:18:44,829 INFO L87 Difference]: Start difference. First operand 214 states and 215 transitions. Second operand has 150 states, 149 states have (on average 1.395973154362416) internal successors, (208), 148 states have internal predecessors, (208), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:57,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:57,488 INFO L93 Difference]: Finished difference Result 226 states and 230 transitions. [2021-05-06 11:18:57,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2021-05-06 11:18:57,488 INFO L78 Accepts]: Start accepts. Automaton has has 150 states, 149 states have (on average 1.395973154362416) internal successors, (208), 148 states have internal predecessors, (208), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 212 [2021-05-06 11:18:57,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:57,489 INFO L225 Difference]: With dead ends: 226 [2021-05-06 11:18:57,489 INFO L226 Difference]: Without dead ends: 218 [2021-05-06 11:18:57,491 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 293 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28944 ImplicationChecksByTransitivity, 14050.3ms TimeCoverageRelationStatistics Valid=1139, Invalid=85591, Unknown=0, NotChecked=0, Total=86730 [2021-05-06 11:18:57,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-05-06 11:18:57,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 217. [2021-05-06 11:18:57,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 212 states have (on average 1.009433962264151) internal successors, (214), 212 states have internal predecessors, (214), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:57,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 218 transitions. [2021-05-06 11:18:57,539 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 218 transitions. Word has length 212 [2021-05-06 11:18:57,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:57,539 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 218 transitions. [2021-05-06 11:18:57,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 150 states, 149 states have (on average 1.395973154362416) internal successors, (208), 148 states have internal predecessors, (208), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:18:57,539 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 218 transitions. [2021-05-06 11:18:57,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-05-06 11:18:57,540 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:57,540 INFO L523 BasicCegarLoop]: trace histogram [68, 68, 59, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:57,541 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable324 [2021-05-06 11:18:57,541 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:57,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:57,541 INFO L82 PathProgramCache]: Analyzing trace with hash -1849210674, now seen corresponding path program 67 times [2021-05-06 11:18:57,541 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:57,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918440442] [2021-05-06 11:18:57,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:57,555 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:18:57,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:57,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:57,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:57,586 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:57,597 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:18:57,613 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:57,616 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:18:57,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:57,618 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:57,626 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:18:57,628 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:18:57,643 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:18:57,653 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:57,654 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:57,656 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:18:57,666 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:57,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:57,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:18:57,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:18:57,681 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:18:57,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:57,695 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:18:57,707 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:57,708 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:18:57,717 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:18:57,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:18:57,731 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:18:57,744 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:18:57,745 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:18:57,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:57,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:57,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:57,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:18:57,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:19:05,148 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:05,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918440442] [2021-05-06 11:19:05,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1918440442] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:05,149 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:05,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [152] imperfect sequences [] total 152 [2021-05-06 11:19:05,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733530188] [2021-05-06 11:19:05,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 152 states [2021-05-06 11:19:05,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:05,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-05-06 11:19:05,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=22853, Unknown=0, NotChecked=0, Total=23256 [2021-05-06 11:19:05,150 INFO L87 Difference]: Start difference. First operand 217 states and 218 transitions. Second operand has 152 states, 151 states have (on average 1.3973509933774835) internal successors, (211), 150 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:18,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:18,089 INFO L93 Difference]: Finished difference Result 229 states and 233 transitions. [2021-05-06 11:19:18,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2021-05-06 11:19:18,089 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 151 states have (on average 1.3973509933774835) internal successors, (211), 150 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 215 [2021-05-06 11:19:18,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:18,090 INFO L225 Difference]: With dead ends: 229 [2021-05-06 11:19:18,090 INFO L226 Difference]: Without dead ends: 221 [2021-05-06 11:19:18,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29725 ImplicationChecksByTransitivity, 14277.9ms TimeCoverageRelationStatistics Valid=1154, Invalid=87948, Unknown=0, NotChecked=0, Total=89102 [2021-05-06 11:19:18,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-05-06 11:19:18,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 220. [2021-05-06 11:19:18,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 215 states have (on average 1.0093023255813953) internal successors, (217), 215 states have internal predecessors, (217), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:18,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 221 transitions. [2021-05-06 11:19:18,126 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 221 transitions. Word has length 215 [2021-05-06 11:19:18,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:18,126 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 221 transitions. [2021-05-06 11:19:18,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 152 states, 151 states have (on average 1.3973509933774835) internal successors, (211), 150 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:18,126 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 221 transitions. [2021-05-06 11:19:18,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2021-05-06 11:19:18,127 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:18,127 INFO L523 BasicCegarLoop]: trace histogram [69, 69, 60, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:18,127 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable329 [2021-05-06 11:19:18,128 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:18,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:18,128 INFO L82 PathProgramCache]: Analyzing trace with hash 739768137, now seen corresponding path program 68 times [2021-05-06 11:19:18,128 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:18,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1211314252] [2021-05-06 11:19:18,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:18,144 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:19:18,158 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:18,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:18,171 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:18,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:18,186 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:19:18,202 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:18,205 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:19:18,215 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:18,216 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:18,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:18,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:18,233 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:19:18,245 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:18,246 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:19:18,248 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:19:18,258 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:18,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:18,268 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:19:18,270 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:19:18,277 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:19:18,289 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:18,293 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:19:18,293 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:18,295 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:18,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:19:18,311 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:19:18,334 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:19:18,350 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:18,351 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:19:18,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:18,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:18,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:18,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:19:18,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:19:25,999 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:25,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1211314252] [2021-05-06 11:19:25,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1211314252] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:26,000 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:26,000 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [154] imperfect sequences [] total 154 [2021-05-06 11:19:26,000 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326021804] [2021-05-06 11:19:26,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 154 states [2021-05-06 11:19:26,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:26,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2021-05-06 11:19:26,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=23462, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 11:19:26,001 INFO L87 Difference]: Start difference. First operand 220 states and 221 transitions. Second operand has 154 states, 153 states have (on average 1.3986928104575163) internal successors, (214), 152 states have internal predecessors, (214), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:39,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:39,318 INFO L93 Difference]: Finished difference Result 232 states and 236 transitions. [2021-05-06 11:19:39,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-05-06 11:19:39,318 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 153 states have (on average 1.3986928104575163) internal successors, (214), 152 states have internal predecessors, (214), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 218 [2021-05-06 11:19:39,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:39,319 INFO L225 Difference]: With dead ends: 232 [2021-05-06 11:19:39,319 INFO L226 Difference]: Without dead ends: 224 [2021-05-06 11:19:39,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 301 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30516 ImplicationChecksByTransitivity, 14777.1ms TimeCoverageRelationStatistics Valid=1169, Invalid=90337, Unknown=0, NotChecked=0, Total=91506 [2021-05-06 11:19:39,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-05-06 11:19:39,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 223. [2021-05-06 11:19:39,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 218 states have (on average 1.0091743119266054) internal successors, (220), 218 states have internal predecessors, (220), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:39,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2021-05-06 11:19:39,356 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 218 [2021-05-06 11:19:39,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:39,356 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2021-05-06 11:19:39,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 154 states, 153 states have (on average 1.3986928104575163) internal successors, (214), 152 states have internal predecessors, (214), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:39,356 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2021-05-06 11:19:39,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2021-05-06 11:19:39,356 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:39,357 INFO L523 BasicCegarLoop]: trace histogram [70, 70, 61, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:39,357 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable334 [2021-05-06 11:19:39,357 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:39,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:39,357 INFO L82 PathProgramCache]: Analyzing trace with hash -15174930, now seen corresponding path program 69 times [2021-05-06 11:19:39,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:39,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2131706760] [2021-05-06 11:19:39,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:39,363 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:19:39,363 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:39,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:39,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:39,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:39,398 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:19:39,411 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:39,413 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:19:39,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:39,415 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:39,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:19:39,424 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:19:39,437 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:19:39,448 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:39,448 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:19:39,450 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:19:39,451 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:39,452 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:39,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:19:39,461 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:19:39,474 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:19:39,484 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:39,487 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:19:39,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:39,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:19:39,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:19:39,502 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:19:39,531 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:19:39,558 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:19:39,559 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:19:39,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:39,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:39,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:39,616 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:19:39,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:19:47,306 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:47,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2131706760] [2021-05-06 11:19:47,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2131706760] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:47,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:47,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [156] imperfect sequences [] total 156 [2021-05-06 11:19:47,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138658053] [2021-05-06 11:19:47,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 156 states [2021-05-06 11:19:47,307 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:47,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2021-05-06 11:19:47,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=24079, Unknown=0, NotChecked=0, Total=24492 [2021-05-06 11:19:47,308 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand has 156 states, 155 states have (on average 1.4) internal successors, (217), 154 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:01,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:01,161 INFO L93 Difference]: Finished difference Result 235 states and 239 transitions. [2021-05-06 11:20:01,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2021-05-06 11:20:01,165 INFO L78 Accepts]: Start accepts. Automaton has has 156 states, 155 states have (on average 1.4) internal successors, (217), 154 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 221 [2021-05-06 11:20:01,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:01,165 INFO L225 Difference]: With dead ends: 235 [2021-05-06 11:20:01,166 INFO L226 Difference]: Without dead ends: 227 [2021-05-06 11:20:01,168 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 305 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31317 ImplicationChecksByTransitivity, 15146.5ms TimeCoverageRelationStatistics Valid=1184, Invalid=92758, Unknown=0, NotChecked=0, Total=93942 [2021-05-06 11:20:01,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-05-06 11:20:01,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 226. [2021-05-06 11:20:01,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 221 states have (on average 1.009049773755656) internal successors, (223), 221 states have internal predecessors, (223), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:01,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2021-05-06 11:20:01,204 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 221 [2021-05-06 11:20:01,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:01,204 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2021-05-06 11:20:01,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 156 states, 155 states have (on average 1.4) internal successors, (217), 154 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:01,205 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2021-05-06 11:20:01,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-05-06 11:20:01,205 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:01,205 INFO L523 BasicCegarLoop]: trace histogram [71, 71, 62, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:01,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable339 [2021-05-06 11:20:01,206 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:01,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:01,206 INFO L82 PathProgramCache]: Analyzing trace with hash -2075322071, now seen corresponding path program 70 times [2021-05-06 11:20:01,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:01,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575874928] [2021-05-06 11:20:01,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:01,212 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:20:01,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:01,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:01,225 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:01,229 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:01,249 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:20:01,263 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:01,265 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:20:01,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:01,276 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:01,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:01,286 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:01,292 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:20:01,303 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:01,303 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:01,305 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:20:01,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:01,315 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:01,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:20:01,325 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:20:01,330 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:20:01,341 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:01,344 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:20:01,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:01,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:01,371 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:20:01,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:20:01,384 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:20:01,398 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:01,399 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:01,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:01,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:01,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:01,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:01,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:20:09,477 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:09,478 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575874928] [2021-05-06 11:20:09,478 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [575874928] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:09,478 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:09,478 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [158] imperfect sequences [] total 158 [2021-05-06 11:20:09,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741293798] [2021-05-06 11:20:09,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 158 states [2021-05-06 11:20:09,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:09,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2021-05-06 11:20:09,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=24704, Unknown=0, NotChecked=0, Total=25122 [2021-05-06 11:20:09,479 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand has 158 states, 157 states have (on average 1.4012738853503184) internal successors, (220), 156 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:23,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:23,617 INFO L93 Difference]: Finished difference Result 238 states and 242 transitions. [2021-05-06 11:20:23,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2021-05-06 11:20:23,618 INFO L78 Accepts]: Start accepts. Automaton has has 158 states, 157 states have (on average 1.4012738853503184) internal successors, (220), 156 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 224 [2021-05-06 11:20:23,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:23,618 INFO L225 Difference]: With dead ends: 238 [2021-05-06 11:20:23,618 INFO L226 Difference]: Without dead ends: 230 [2021-05-06 11:20:23,621 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 309 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32128 ImplicationChecksByTransitivity, 15608.8ms TimeCoverageRelationStatistics Valid=1199, Invalid=95211, Unknown=0, NotChecked=0, Total=96410 [2021-05-06 11:20:23,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-05-06 11:20:23,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2021-05-06 11:20:23,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 224 states have (on average 1.0089285714285714) internal successors, (226), 224 states have internal predecessors, (226), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:23,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 230 transitions. [2021-05-06 11:20:23,657 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 230 transitions. Word has length 224 [2021-05-06 11:20:23,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:23,658 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 230 transitions. [2021-05-06 11:20:23,658 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 158 states, 157 states have (on average 1.4012738853503184) internal successors, (220), 156 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:23,658 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 230 transitions. [2021-05-06 11:20:23,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2021-05-06 11:20:23,659 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:23,659 INFO L523 BasicCegarLoop]: trace histogram [72, 72, 63, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:23,659 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable344 [2021-05-06 11:20:23,659 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:23,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:23,659 INFO L82 PathProgramCache]: Analyzing trace with hash -836139762, now seen corresponding path program 71 times [2021-05-06 11:20:23,659 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:23,660 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086396078] [2021-05-06 11:20:23,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:23,675 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:20:23,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:23,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:23,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:23,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:23,719 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:20:23,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:23,735 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:20:23,744 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:23,745 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:23,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:23,755 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:23,761 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:20:23,771 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:23,772 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:23,774 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:20:23,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:23,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:23,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:20:23,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:20:23,798 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:20:23,809 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:23,812 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:20:23,824 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:23,827 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:23,837 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:20:23,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:20:23,851 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:20:23,865 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:23,866 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:23,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:23,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:23,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:23,925 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:23,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:20:32,191 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:32,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086396078] [2021-05-06 11:20:32,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1086396078] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:32,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:32,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [160] imperfect sequences [] total 160 [2021-05-06 11:20:32,192 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826769415] [2021-05-06 11:20:32,192 INFO L460 AbstractCegarLoop]: Interpolant automaton has 160 states [2021-05-06 11:20:32,192 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:32,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2021-05-06 11:20:32,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=423, Invalid=25337, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 11:20:32,194 INFO L87 Difference]: Start difference. First operand 229 states and 230 transitions. Second operand has 160 states, 159 states have (on average 1.4025157232704402) internal successors, (223), 158 states have internal predecessors, (223), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:46,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:46,561 INFO L93 Difference]: Finished difference Result 241 states and 245 transitions. [2021-05-06 11:20:46,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2021-05-06 11:20:46,561 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 159 states have (on average 1.4025157232704402) internal successors, (223), 158 states have internal predecessors, (223), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 227 [2021-05-06 11:20:46,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:46,562 INFO L225 Difference]: With dead ends: 241 [2021-05-06 11:20:46,562 INFO L226 Difference]: Without dead ends: 233 [2021-05-06 11:20:46,565 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 313 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32949 ImplicationChecksByTransitivity, 15946.7ms TimeCoverageRelationStatistics Valid=1214, Invalid=97696, Unknown=0, NotChecked=0, Total=98910 [2021-05-06 11:20:46,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-05-06 11:20:46,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 232. [2021-05-06 11:20:46,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 227 states have (on average 1.0088105726872247) internal successors, (229), 227 states have internal predecessors, (229), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:46,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 233 transitions. [2021-05-06 11:20:46,603 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 233 transitions. Word has length 227 [2021-05-06 11:20:46,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:46,603 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 233 transitions. [2021-05-06 11:20:46,604 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 160 states, 159 states have (on average 1.4025157232704402) internal successors, (223), 158 states have internal predecessors, (223), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:46,604 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 233 transitions. [2021-05-06 11:20:46,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2021-05-06 11:20:46,604 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:46,604 INFO L523 BasicCegarLoop]: trace histogram [73, 73, 64, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:46,604 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable349 [2021-05-06 11:20:46,605 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:46,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:46,605 INFO L82 PathProgramCache]: Analyzing trace with hash 400118537, now seen corresponding path program 72 times [2021-05-06 11:20:46,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:46,605 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407241010] [2021-05-06 11:20:46,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:46,611 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:20:46,622 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:46,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:46,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:46,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:46,646 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:20:46,659 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:46,661 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:20:46,670 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:46,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:46,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:20:46,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:20:46,687 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:20:46,697 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:46,698 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:46,700 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:20:46,700 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:46,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:46,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:20:46,709 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:20:46,722 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:20:46,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:46,735 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:20:46,759 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:46,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:20:46,770 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:20:46,774 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:20:46,783 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:20:46,797 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:20:46,798 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:20:46,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:46,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:46,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:46,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:46,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:20:55,148 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:55,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407241010] [2021-05-06 11:20:55,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1407241010] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:55,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:55,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [162] imperfect sequences [] total 162 [2021-05-06 11:20:55,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607224497] [2021-05-06 11:20:55,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 162 states [2021-05-06 11:20:55,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:55,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2021-05-06 11:20:55,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=428, Invalid=25978, Unknown=0, NotChecked=0, Total=26406 [2021-05-06 11:20:55,150 INFO L87 Difference]: Start difference. First operand 232 states and 233 transitions. Second operand has 162 states, 161 states have (on average 1.4037267080745341) internal successors, (226), 160 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:09,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:09,941 INFO L93 Difference]: Finished difference Result 244 states and 248 transitions. [2021-05-06 11:21:09,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 159 states. [2021-05-06 11:21:09,941 INFO L78 Accepts]: Start accepts. Automaton has has 162 states, 161 states have (on average 1.4037267080745341) internal successors, (226), 160 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 230 [2021-05-06 11:21:09,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:09,942 INFO L225 Difference]: With dead ends: 244 [2021-05-06 11:21:09,942 INFO L226 Difference]: Without dead ends: 236 [2021-05-06 11:21:09,945 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 317 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33780 ImplicationChecksByTransitivity, 16193.2ms TimeCoverageRelationStatistics Valid=1229, Invalid=100213, Unknown=0, NotChecked=0, Total=101442 [2021-05-06 11:21:09,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-05-06 11:21:09,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 235. [2021-05-06 11:21:09,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 230 states have (on average 1.008695652173913) internal successors, (232), 230 states have internal predecessors, (232), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:09,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 236 transitions. [2021-05-06 11:21:09,983 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 236 transitions. Word has length 230 [2021-05-06 11:21:09,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:09,983 INFO L480 AbstractCegarLoop]: Abstraction has 235 states and 236 transitions. [2021-05-06 11:21:09,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 162 states, 161 states have (on average 1.4037267080745341) internal successors, (226), 160 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:09,983 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 236 transitions. [2021-05-06 11:21:09,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-05-06 11:21:09,984 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:09,984 INFO L523 BasicCegarLoop]: trace histogram [74, 74, 65, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:09,984 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable354 [2021-05-06 11:21:09,984 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:09,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:09,984 INFO L82 PathProgramCache]: Analyzing trace with hash 426540846, now seen corresponding path program 73 times [2021-05-06 11:21:09,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:09,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518096085] [2021-05-06 11:21:09,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:09,992 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size [2021-05-06 11:21:09,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:09,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:10,004 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:21:10,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:21:10,033 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.9 percent of original size 70 [2021-05-06 11:21:10,046 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:10,052 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size [2021-05-06 11:21:10,061 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:10,062 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:10,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:21:10,071 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:21:10,085 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.6 percent of original size 60 [2021-05-06 11:21:10,100 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:10,101 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:21:10,103 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size [2021-05-06 11:21:10,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:10,117 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:10,127 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:21:10,130 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:21:10,137 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.7 percent of original size 55 [2021-05-06 11:21:10,151 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:10,155 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size [2021-05-06 11:21:10,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:10,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:21:10,170 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:21:10,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:21:10,196 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 90.3 percent of original size 65 [2021-05-06 11:21:10,212 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:21:10,213 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:21:10,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:10,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:10,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:10,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:10,274 WARN L159 QuantifierPusher]: Ignoring assumption.