/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/loop-acceleration/phases_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:24:57,412 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:24:57,414 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:24:57,446 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:24:57,467 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:24:57,469 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:24:57,470 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:24:57,471 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:24:57,473 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:24:57,474 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:24:57,476 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:24:57,479 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:24:57,480 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:24:57,481 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:24:57,482 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:24:57,484 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:24:57,486 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 11:24:57,494 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:24:57,494 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:24:57,495 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:24:57,495 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 11:24:57,514 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:24:57,514 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:24:57,517 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:24:57,517 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:24:57,517 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:24:57,517 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:24:57,517 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:24:57,517 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:24:57,518 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:24:57,518 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:24:57,518 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:24:57,519 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:24:57,519 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:24:57,519 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:24:57,519 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:24:57,519 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:24:57,519 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:24:57,519 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:24:57,519 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:24:57,519 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:24:57,519 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:24:57,520 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:24:57,520 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:24:57,520 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:24:57,789 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:24:57,802 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:24:57,803 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:24:57,804 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:24:57,804 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:24:57,805 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_1-1.c [2021-05-06 11:24:57,855 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ded1899e/9bfd4ec6218541598341141b27a907fd/FLAG07b0c7c88 [2021-05-06 11:24:58,203 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:24:58,203 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-1.c [2021-05-06 11:24:58,207 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ded1899e/9bfd4ec6218541598341141b27a907fd/FLAG07b0c7c88 [2021-05-06 11:24:58,630 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ded1899e/9bfd4ec6218541598341141b27a907fd [2021-05-06 11:24:58,631 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:24:58,632 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:24:58,633 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:24:58,634 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:24:58,636 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:24:58,636 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:24:58" (1/1) ... [2021-05-06 11:24:58,637 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@469c327a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58, skipping insertion in model container [2021-05-06 11:24:58,637 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:24:58" (1/1) ... [2021-05-06 11:24:58,641 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:24:58,648 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:24:58,723 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-1.c[322,335] [2021-05-06 11:24:58,730 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:24:58,737 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:24:58,745 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-1.c[322,335] [2021-05-06 11:24:58,747 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:24:58,755 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:24:58,755 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58 WrapperNode [2021-05-06 11:24:58,755 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:24:58,756 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:24:58,756 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:24:58,756 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:24:58,799 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58" (1/1) ... [2021-05-06 11:24:58,800 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58" (1/1) ... [2021-05-06 11:24:58,803 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58" (1/1) ... [2021-05-06 11:24:58,804 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58" (1/1) ... [2021-05-06 11:24:58,806 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58" (1/1) ... [2021-05-06 11:24:58,808 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58" (1/1) ... [2021-05-06 11:24:58,808 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58" (1/1) ... [2021-05-06 11:24:58,809 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:24:58,810 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:24:58,810 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:24:58,810 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:24:58,810 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58" (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 11:24:58,886 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:24:58,886 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:24:58,887 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:24:58,887 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:24:58,887 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:24:58,887 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:24:58,887 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:24:58,887 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:24:58,887 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:24:58,888 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:24:58,888 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:24:58,888 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:24:58,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:24:58,888 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:24:58,889 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:24:58,889 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:24:58,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:24:59,022 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:24:59,022 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:24:59,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:24:59 BoogieIcfgContainer [2021-05-06 11:24:59,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:24:59,024 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:24:59,024 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:24:59,026 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:24:59,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:24:58" (1/3) ... [2021-05-06 11:24:59,027 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e1b5ed2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:24:59, skipping insertion in model container [2021-05-06 11:24:59,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:58" (2/3) ... [2021-05-06 11:24:59,027 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e1b5ed2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:24:59, skipping insertion in model container [2021-05-06 11:24:59,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:24:59" (3/3) ... [2021-05-06 11:24:59,028 INFO L111 eAbstractionObserver]: Analyzing ICFG phases_1-1.c [2021-05-06 11:24:59,031 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:24:59,033 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:24:59,043 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:24:59,056 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:24:59,056 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:24:59,056 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:24:59,056 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:24:59,056 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:24:59,057 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:24:59,057 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:24:59,057 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:24:59,065 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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 11:24:59,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:24:59,069 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:59,069 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:59,069 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:59,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:59,072 INFO L82 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 1 times [2021-05-06 11:24:59,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:59,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111989140] [2021-05-06 11:24:59,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:59,113 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:59,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:59,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:59,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:59,199 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 11:24:59,200 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:59,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111989140] [2021-05-06 11:24:59,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [111989140] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:59,202 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:59,202 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:24:59,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847237369] [2021-05-06 11:24:59,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:24:59,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:59,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:24:59,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:24:59,213 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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 11:24:59,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:59,247 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-05-06 11:24:59,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:24:59,248 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 11:24:59,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:59,252 INFO L225 Difference]: With dead ends: 30 [2021-05-06 11:24:59,252 INFO L226 Difference]: Without dead ends: 13 [2021-05-06 11:24:59,254 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:24:59,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-06 11:24:59,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-06 11:24:59,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 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 11:24:59,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-06 11:24:59,278 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-06 11:24:59,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:59,278 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-06 11:24:59,278 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 11:24:59,278 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-06 11:24:59,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:24:59,279 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:59,279 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:59,279 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:24:59,279 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:59,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:59,280 INFO L82 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 1 times [2021-05-06 11:24:59,280 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:59,280 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1746653995] [2021-05-06 11:24:59,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:59,282 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:59,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:59,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:59,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:59,425 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 11:24:59,426 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:59,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1746653995] [2021-05-06 11:24:59,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1746653995] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:59,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:59,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:24:59,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764258642] [2021-05-06 11:24:59,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:24:59,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:59,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:24:59,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:24:59,429 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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 11:24:59,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:59,510 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2021-05-06 11:24:59,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:24:59,511 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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 11:24:59,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:59,512 INFO L225 Difference]: With dead ends: 22 [2021-05-06 11:24:59,513 INFO L226 Difference]: Without dead ends: 15 [2021-05-06 11:24:59,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 60.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:24:59,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-06 11:24:59,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-06 11:24:59,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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 11:24:59,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-06 11:24:59,526 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-06 11:24:59,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:59,526 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-06 11:24:59,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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 11:24:59,526 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-06 11:24:59,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-06 11:24:59,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:59,527 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:59,527 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:24:59,527 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:59,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:59,527 INFO L82 PathProgramCache]: Analyzing trace with hash 925229631, now seen corresponding path program 1 times [2021-05-06 11:24:59,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:59,528 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [789255298] [2021-05-06 11:24:59,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:59,568 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:59,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:59,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:59,627 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:59,642 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 11:24:59,648 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:59,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:59,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:59,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:59,795 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 11:24:59,851 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:59,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [789255298] [2021-05-06 11:24:59,851 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [789255298] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:59,851 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:59,851 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:24:59,852 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605636766] [2021-05-06 11:24:59,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:24:59,852 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:59,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:24:59,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:24:59,854 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 11:24:59,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:59,954 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-06 11:24:59,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:24:59,954 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 13 [2021-05-06 11:24:59,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:59,955 INFO L225 Difference]: With dead ends: 22 [2021-05-06 11:24:59,955 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 11:24:59,956 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 127.4ms TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:24:59,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 11:24:59,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 11:24:59,963 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 11:24:59,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-06 11:24:59,965 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2021-05-06 11:24:59,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:59,965 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-06 11:24:59,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 11:24:59,965 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-06 11:24:59,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 11:24:59,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:59,965 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:59,966 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:24:59,966 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:59,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:59,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1220035546, now seen corresponding path program 1 times [2021-05-06 11:24:59,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:59,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224069538] [2021-05-06 11:24:59,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:59,986 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:25:00,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:00,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:25:00,046 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:25:00,059 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 11:25:00,076 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:25:00,088 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:00,095 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:00,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:25:00,258 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:25:00,277 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:25:00,305 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:25:00,313 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:25:00,317 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:25:00,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:00,334 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:00,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:25:00,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:25:00,375 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:25:00,388 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 11:25:00,390 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:25:00,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:00,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:00,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:00,547 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 11:25:00,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:25:00,655 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:00,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224069538] [2021-05-06 11:25:00,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [224069538] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:00,655 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:00,655 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:25:00,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402527473] [2021-05-06 11:25:00,656 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:25:00,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:00,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:25:00,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:25:00,656 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 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 11:25:00,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:00,920 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-05-06 11:25:00,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:25:00,920 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 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 15 [2021-05-06 11:25:00,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:00,920 INFO L225 Difference]: With dead ends: 31 [2021-05-06 11:25:00,920 INFO L226 Difference]: Without dead ends: 21 [2021-05-06 11:25:00,921 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 342.3ms TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:25:00,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-06 11:25:00,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-06 11:25:00,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 16 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 11:25:00,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-05-06 11:25:00,924 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 15 [2021-05-06 11:25:00,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:00,924 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-05-06 11:25:00,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 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 11:25:00,925 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-05-06 11:25:00,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:25:00,925 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:00,925 INFO L523 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:00,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:25:00,925 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:00,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:00,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1815013998, now seen corresponding path program 2 times [2021-05-06 11:25:00,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:00,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298552852] [2021-05-06 11:25:00,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:00,933 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:25:00,933 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:00,945 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:25:00,958 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:25:00,971 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 11:25:00,975 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:25:00,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:00,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:01,143 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:25:01,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:25:01,174 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:25:01,200 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:25:01,202 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:25:01,210 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:25:01,222 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:01,226 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:03,397 WARN L205 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:25:05,432 WARN L205 SmtUtils]: Spent 2.03 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:25:08,714 WARN L205 SmtUtils]: Spent 3.28 s on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:25:11,395 WARN L205 SmtUtils]: Spent 2.68 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:25:13,408 WARN L205 SmtUtils]: Spent 2.01 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:25:13,939 WARN L205 SmtUtils]: Spent 520.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:25:14,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:25:14,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:25:14,279 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:25:14,562 WARN L205 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:25:14,566 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:25:14,582 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:25:14,595 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:14,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:14,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:25:14,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:25:14,713 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:25:14,726 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 11:25:14,727 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:25:14,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:14,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:14,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:14,872 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 11:25:14,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:25:15,059 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:15,060 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298552852] [2021-05-06 11:25:15,060 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [298552852] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:15,060 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:15,060 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:25:15,060 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598955323] [2021-05-06 11:25:15,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:25:15,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:15,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:25:15,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:25:15,061 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 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 11:25:15,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:15,342 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2021-05-06 11:25:15,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:25:15,343 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 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 19 [2021-05-06 11:25:15,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:15,344 INFO L225 Difference]: With dead ends: 30 [2021-05-06 11:25:15,344 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 11:25:15,345 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 375.8ms TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:25:15,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 11:25:15,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 11:25:15,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 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 11:25:15,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-05-06 11:25:15,356 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 19 [2021-05-06 11:25:15,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:15,356 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-05-06 11:25:15,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 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 11:25:15,356 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-05-06 11:25:15,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 11:25:15,358 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:15,358 INFO L523 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:15,358 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:25:15,358 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:15,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:15,358 INFO L82 PathProgramCache]: Analyzing trace with hash -205744403, now seen corresponding path program 3 times [2021-05-06 11:25:15,359 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:15,359 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926491198] [2021-05-06 11:25:15,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:15,370 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:25:15,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:15,403 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:25:15,419 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:25:15,433 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 11:25:15,439 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:25:15,441 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:15,443 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:19,459 WARN L205 SmtUtils]: Spent 4.01 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:25:23,475 WARN L205 SmtUtils]: Spent 4.01 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:25:27,493 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:25:31,510 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:25:35,525 WARN L205 SmtUtils]: Spent 4.01 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:25:35,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:25:35,657 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:25:35,694 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:25:35,757 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:25:35,758 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:25:35,761 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:25:35,762 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:35,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:36,296 WARN L205 SmtUtils]: Spent 438.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 11:25:36,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:25:36,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:25:36,790 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-06 11:25:36,894 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-06 11:25:36,917 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:25:37,636 WARN L205 SmtUtils]: Spent 718.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:25:37,636 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:25:37,641 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:25:37,642 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:37,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:37,864 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:25:37,878 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:25:37,881 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:25:37,919 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:25:37,933 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 11:25:37,934 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:25:37,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:38,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:38,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:38,087 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 11:25:38,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:25:38,351 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:38,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926491198] [2021-05-06 11:25:38,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1926491198] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:38,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:38,351 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:25:38,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544899301] [2021-05-06 11:25:38,351 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:25:38,351 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:38,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:25:38,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:25:38,352 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 11 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 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 11:25:38,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:38,671 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-05-06 11:25:38,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:25:38,672 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 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 21 [2021-05-06 11:25:38,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:38,672 INFO L225 Difference]: With dead ends: 32 [2021-05-06 11:25:38,672 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 11:25:38,673 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 479.6ms TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:25:38,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 11:25:38,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-06 11:25:38,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 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 11:25:38,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-06 11:25:38,676 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 21 [2021-05-06 11:25:38,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:38,677 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-06 11:25:38,677 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 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 11:25:38,677 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-06 11:25:38,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:25:38,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:38,677 INFO L523 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:38,677 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:25:38,677 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:38,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:38,678 INFO L82 PathProgramCache]: Analyzing trace with hash 114109832, now seen corresponding path program 4 times [2021-05-06 11:25:38,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:38,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27528933] [2021-05-06 11:25:38,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:38,684 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:25:38,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:38,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:25:38,723 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:25:38,735 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 11:25:38,739 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:25:38,748 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:38,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:38,812 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:25:38,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:25:38,840 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:25:38,882 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:25:38,883 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:25:38,886 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:25:38,896 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:38,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:39,373 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:25:39,373 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:25:39,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:25:39,565 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:25:39,731 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:25:39,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:25:39,737 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:25:39,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:39,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:25:39,778 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:25:39,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:25:39,790 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:25:39,802 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 11:25:39,804 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:25:39,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:39,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:39,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:39,926 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 11:25:39,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:25:42,476 WARN L205 SmtUtils]: Spent 2.55 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:25:47,332 WARN L205 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:25:47,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:25:49,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:25:54,071 WARN L205 SmtUtils]: Spent 2.47 s on a formula simplification that was a NOOP. DAG size: 64 [2021-05-06 11:25:54,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:25:56,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:26:00,719 WARN L205 SmtUtils]: Spent 4.43 s on a formula simplification. DAG size of input: 69 DAG size of output: 67 [2021-05-06 11:26:00,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:26:00,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:26:05,941 WARN L205 SmtUtils]: Spent 4.95 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:26:05,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:26:06,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:26:11,083 WARN L205 SmtUtils]: Spent 4.79 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:26:11,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:26:11,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:26:15,720 WARN L205 SmtUtils]: Spent 4.23 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:26:15,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:26:15,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:26:15,941 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:15,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27528933] [2021-05-06 11:26:15,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [27528933] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:15,941 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:15,941 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:26:15,941 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603742572] [2021-05-06 11:26:15,942 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:26:15,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:15,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:26:15,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=163, Unknown=2, NotChecked=0, Total=210 [2021-05-06 11:26:15,942 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 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 11:26:16,381 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 48 [2021-05-06 11:26:25,477 WARN L205 SmtUtils]: Spent 2.76 s on a formula simplification that was a NOOP. DAG size: 94 [2021-05-06 11:26:32,412 WARN L205 SmtUtils]: Spent 2.31 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:26:34,881 WARN L205 SmtUtils]: Spent 2.27 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:26:39,747 WARN L205 SmtUtils]: Spent 2.47 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:26:44,689 WARN L205 SmtUtils]: Spent 2.60 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:26:49,713 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:26:52,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:52,226 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2021-05-06 11:26:52,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:26:52,227 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 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 11:26:52,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:52,227 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:26:52,227 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 11:26:52,227 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 48752.5ms TimeCoverageRelationStatistics Valid=92, Invalid=367, Unknown=3, NotChecked=0, Total=462 [2021-05-06 11:26:52,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 11:26:52,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-06 11:26:52,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 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 11:26:52,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-05-06 11:26:52,232 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 23 [2021-05-06 11:26:52,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:52,232 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-05-06 11:26:52,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 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 11:26:52,233 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-05-06 11:26:52,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:26:52,233 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:52,233 INFO L523 BasicCegarLoop]: trace histogram [7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:52,233 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:26:52,233 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:52,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:52,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1743615645, now seen corresponding path program 5 times [2021-05-06 11:26:52,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:52,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [175816424] [2021-05-06 11:26:52,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:52,259 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:26:52,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:26:52,327 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:26:52,360 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:26:52,437 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 11:26:52,444 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:26:52,478 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:26:52,479 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:26:52,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:26:52,732 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:26:52,787 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:26:52,973 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-06 11:26:52,974 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:26:52,975 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:26:52,977 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:26:52,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:26:52,979 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:26:55,222 WARN L205 SmtUtils]: Spent 2.10 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:26:55,720 WARN L205 SmtUtils]: Spent 466.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:26:57,746 WARN L205 SmtUtils]: Spent 2.03 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:26:58,014 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:26:58,207 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:26:58,255 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:26:58,477 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:26:58,926 WARN L205 SmtUtils]: Spent 448.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:26:58,926 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:26:58,932 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:26:58,979 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:26:58,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:26:59,034 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:26:59,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:26:59,083 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:26:59,190 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-06 11:26:59,191 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 11:26:59,192 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:26:59,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:59,407 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 14 [2021-05-06 11:26:59,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:59,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:59,751 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 11:26:59,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:01,870 WARN L205 SmtUtils]: Spent 2.12 s on a formula simplification that was a NOOP. DAG size: 59 [2021-05-06 11:27:08,567 WARN L205 SmtUtils]: Spent 2.18 s on a formula simplification that was a NOOP. DAG size: 59 [2021-05-06 11:27:08,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:10,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:15,433 WARN L205 SmtUtils]: Spent 2.43 s on a formula simplification that was a NOOP. DAG size: 65 [2021-05-06 11:27:15,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:17,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:22,409 WARN L205 SmtUtils]: Spent 4.48 s on a formula simplification. DAG size of input: 71 DAG size of output: 69 [2021-05-06 11:27:22,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:22,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:27,295 WARN L205 SmtUtils]: Spent 4.61 s on a formula simplification. DAG size of input: 72 DAG size of output: 68 [2021-05-06 11:27:27,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:27,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:34,037 WARN L205 SmtUtils]: Spent 4.28 s on a formula simplification. DAG size of input: 72 DAG size of output: 68 [2021-05-06 11:27:34,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:34,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:38,983 WARN L205 SmtUtils]: Spent 4.53 s on a formula simplification. DAG size of input: 72 DAG size of output: 68 [2021-05-06 11:27:38,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:39,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:44,006 WARN L205 SmtUtils]: Spent 4.46 s on a formula simplification. DAG size of input: 72 DAG size of output: 68 [2021-05-06 11:27:44,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:44,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:27:44,277 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:27:44,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [175816424] [2021-05-06 11:27:44,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [175816424] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:27:44,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:27:44,277 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:27:44,277 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383182634] [2021-05-06 11:27:44,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:27:44,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:27:44,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:27:44,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=187, Unknown=4, NotChecked=0, Total=240 [2021-05-06 11:27:44,278 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 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 11:27:44,772 WARN L205 SmtUtils]: Spent 320.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 48 [2021-05-06 11:27:54,288 WARN L205 SmtUtils]: Spent 2.42 s on a formula simplification that was a NOOP. DAG size: 95 [2021-05-06 11:28:05,821 WARN L205 SmtUtils]: Spent 2.40 s on a formula simplification that was a NOOP. DAG size: 98 [2021-05-06 11:28:13,052 WARN L205 SmtUtils]: Spent 2.36 s on a formula simplification that was a NOOP. DAG size: 98 [2021-05-06 11:28:15,872 WARN L205 SmtUtils]: Spent 2.46 s on a formula simplification that was a NOOP. DAG size: 98 [2021-05-06 11:28:24,046 WARN L205 SmtUtils]: Spent 3.09 s on a formula simplification that was a NOOP. DAG size: 98 [2021-05-06 11:28:26,713 WARN L205 SmtUtils]: Spent 2.32 s on a formula simplification that was a NOOP. DAG size: 98 [2021-05-06 11:28:27,122 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:28:27,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:28:27,301 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-06 11:28:27,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:28:27,302 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 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 25 [2021-05-06 11:28:27,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:28:27,302 INFO L225 Difference]: With dead ends: 36 [2021-05-06 11:28:27,302 INFO L226 Difference]: Without dead ends: 29 [2021-05-06 11:28:27,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 8 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 70627.1ms TimeCoverageRelationStatistics Valid=103, Invalid=440, Unknown=9, NotChecked=0, Total=552 [2021-05-06 11:28:27,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-06 11:28:27,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-06 11:28:27,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 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 11:28:27,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-05-06 11:28:27,309 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 25 [2021-05-06 11:28:27,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:28:27,309 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-05-06 11:28:27,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 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 11:28:27,309 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-05-06 11:28:27,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 11:28:27,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:28:27,310 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:28:27,310 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 11:28:27,310 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:28:27,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:28:27,310 INFO L82 PathProgramCache]: Analyzing trace with hash -311403906, now seen corresponding path program 6 times [2021-05-06 11:28:27,310 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:28:27,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772077970] [2021-05-06 11:28:27,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:28:27,339 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:28:27,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:28:27,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:28:27,449 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:28:27,541 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 11:28:27,548 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:28:27,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:28:27,589 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:28:27,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:28:27,809 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:28:27,878 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:28:28,069 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:28:28,070 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:28:28,071 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:28:28,073 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:28:28,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:28:28,114 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:28:28,566 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:28:28,743 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 11:28:28,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:28:28,917 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-06 11:28:29,063 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:28:29,284 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:28:29,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:28:29,288 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:28:29,338 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:28:29,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:28:29,447 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:28:29,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:28:29,499 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:28:29,592 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 11:28:29,593 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:28:29,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:30,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:28:30,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:30,152 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 11:28:30,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:28:32,507 WARN L205 SmtUtils]: Spent 2.35 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:28:39,896 WARN L205 SmtUtils]: Spent 2.44 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:28:39,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:28:45,047 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 23 [2021-05-06 11:28:45,343 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:28:45,663 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:28:46,013 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:28:46,399 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:28:46,816 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:28:47,001 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:28:47,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772077970] [2021-05-06 11:28:47,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [772077970] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:28:47,002 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:28:47,002 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:28:47,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978531976] [2021-05-06 11:28:47,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:28:47,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:28:47,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:28:47,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=216, Unknown=3, NotChecked=0, Total=272 [2021-05-06 11:28:47,003 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 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 11:28:47,583 WARN L205 SmtUtils]: Spent 346.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 48 [2021-05-06 11:28:52,039 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-06 11:28:57,218 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:28:57,685 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:29:00,300 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:29:00,666 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:29:01,006 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:29:01,357 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:29:01,665 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:29:04,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:29:04,623 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-05-06 11:29:04,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:29:04,624 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 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 27 [2021-05-06 11:29:04,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:29:04,624 INFO L225 Difference]: With dead ends: 38 [2021-05-06 11:29:04,624 INFO L226 Difference]: Without dead ends: 31 [2021-05-06 11:29:04,625 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 9 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 19219.1ms TimeCoverageRelationStatistics Valid=114, Invalid=532, Unknown=4, NotChecked=0, Total=650 [2021-05-06 11:29:04,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-06 11:29:04,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-06 11:29:04,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 states have internal predecessors, (30), 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 11:29:04,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-06 11:29:04,631 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 27 [2021-05-06 11:29:04,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:29:04,631 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-06 11:29:04,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 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 11:29:04,632 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-06 11:29:04,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:29:04,632 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:29:04,632 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:29:04,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:29:04,632 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:29:04,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:29:04,632 INFO L82 PathProgramCache]: Analyzing trace with hash 1654542553, now seen corresponding path program 7 times [2021-05-06 11:29:04,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:29:04,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638888375] [2021-05-06 11:29:04,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:29:04,660 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:29:04,694 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:29:04,731 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:29:04,766 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:29:04,865 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 11:29:04,873 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:29:04,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:29:04,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:29:05,363 WARN L205 SmtUtils]: Spent 320.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:29:05,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:29:05,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:29:05,493 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:29:05,660 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:29:05,661 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:29:05,662 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:29:05,664 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:29:05,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:29:05,705 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:29:06,445 WARN L205 SmtUtils]: Spent 584.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:29:06,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:29:06,701 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:29:06,948 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:29:07,480 WARN L205 SmtUtils]: Spent 532.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:29:07,481 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:29:07,484 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:29:07,484 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:29:07,486 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:29:07,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:29:07,550 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:29:07,635 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:29:07,722 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 11:29:07,723 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:29:07,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:07,907 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 15 [2021-05-06 11:29:08,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:29:08,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:08,260 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 11:29:08,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:10,664 WARN L205 SmtUtils]: Spent 2.40 s on a formula simplification that was a NOOP. DAG size: 59 [2021-05-06 11:29:20,021 WARN L205 SmtUtils]: Spent 2.31 s on a formula simplification that was a NOOP. DAG size: 59 [2021-05-06 11:29:20,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:22,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:27,108 WARN L205 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 65 [2021-05-06 11:29:27,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:29,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:33,979 WARN L205 SmtUtils]: Spent 4.35 s on a formula simplification. DAG size of input: 70 DAG size of output: 68 [2021-05-06 11:29:33,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:34,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:38,973 WARN L205 SmtUtils]: Spent 4.66 s on a formula simplification. DAG size of input: 71 DAG size of output: 67 [2021-05-06 11:29:38,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:39,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:48,283 WARN L205 SmtUtils]: Spent 4.63 s on a formula simplification. DAG size of input: 71 DAG size of output: 67 [2021-05-06 11:29:48,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:48,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:55,035 WARN L205 SmtUtils]: Spent 4.23 s on a formula simplification. DAG size of input: 71 DAG size of output: 67 [2021-05-06 11:29:55,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:29:55,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:30:00,903 WARN L205 SmtUtils]: Spent 5.27 s on a formula simplification. DAG size of input: 71 DAG size of output: 67 [2021-05-06 11:30:00,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:30:01,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:30:08,238 WARN L205 SmtUtils]: Spent 4.55 s on a formula simplification. DAG size of input: 71 DAG size of output: 67 [2021-05-06 11:30:08,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:30:10,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:30:15,308 WARN L205 SmtUtils]: Spent 4.29 s on a formula simplification. DAG size of input: 71 DAG size of output: 67 [2021-05-06 11:30:15,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:30:17,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:30:17,853 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:30:17,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638888375] [2021-05-06 11:30:17,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1638888375] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:30:17,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:30:17,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:30:17,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287045287] [2021-05-06 11:30:17,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:30:17,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:30:17,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:30:17,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=241, Unknown=8, NotChecked=0, Total=306 [2021-05-06 11:30:17,854 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 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 11:30:18,453 WARN L205 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 48 [2021-05-06 11:30:27,684 WARN L205 SmtUtils]: Spent 2.29 s on a formula simplification that was a NOOP. DAG size: 95 [2021-05-06 11:30:37,000 WARN L205 SmtUtils]: Spent 2.34 s on a formula simplification that was a NOOP. DAG size: 97 [2021-05-06 11:30:42,362 WARN L205 SmtUtils]: Spent 2.32 s on a formula simplification that was a NOOP. DAG size: 97 [2021-05-06 11:30:48,400 WARN L205 SmtUtils]: Spent 2.29 s on a formula simplification that was a NOOP. DAG size: 97 [2021-05-06 11:30:55,247 WARN L205 SmtUtils]: Spent 2.36 s on a formula simplification that was a NOOP. DAG size: 97 [2021-05-06 11:31:02,580 WARN L205 SmtUtils]: Spent 2.31 s on a formula simplification that was a NOOP. DAG size: 97 [2021-05-06 11:31:06,025 WARN L205 SmtUtils]: Spent 3.05 s on a formula simplification that was a NOOP. DAG size: 97 [2021-05-06 11:31:11,030 WARN L205 SmtUtils]: Spent 2.25 s on a formula simplification that was a NOOP. DAG size: 97 [2021-05-06 11:31:16,507 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:31:16,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:31:16,666 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-05-06 11:31:16,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:31:16,667 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 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 11:31:16,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:31:16,668 INFO L225 Difference]: With dead ends: 40 [2021-05-06 11:31:16,668 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 11:31:16,668 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 10 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 99795.1ms TimeCoverageRelationStatistics Valid=125, Invalid=618, Unknown=13, NotChecked=0, Total=756 [2021-05-06 11:31:16,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 11:31:16,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-06 11:31:16,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 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 11:31:16,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2021-05-06 11:31:16,675 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 29 [2021-05-06 11:31:16,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:31:16,675 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2021-05-06 11:31:16,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 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 11:31:16,675 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2021-05-06 11:31:16,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 11:31:16,676 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:31:16,676 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:31:16,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:31:16,676 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:31:16,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:31:16,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1143479412, now seen corresponding path program 8 times [2021-05-06 11:31:16,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:31:16,679 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [695673402] [2021-05-06 11:31:16,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:31:16,738 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:31:16,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:16,834 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:31:16,867 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:31:16,953 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 11:31:16,960 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:31:16,961 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:16,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:19,188 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 11:31:19,280 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:31:19,296 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:31:19,426 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:31:19,620 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:31:19,621 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:31:19,623 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:31:19,627 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:31:19,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:19,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:20,080 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:31:20,188 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:31:20,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:31:20,627 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:31:23,022 WARN L205 SmtUtils]: Spent 2.39 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:31:23,022 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:31:23,026 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:31:23,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:23,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:23,416 WARN L205 SmtUtils]: Spent 387.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:31:23,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:31:23,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:31:23,573 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:31:23,662 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 11:31:23,663 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:31:23,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:23,897 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 16 [2021-05-06 11:31:24,066 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:31:24,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:31:24,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:24,335 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 11:31:24,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:31:24,464 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 11:31:24,917 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 23 [2021-05-06 11:31:25,187 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:25,495 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:25,843 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:26,218 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:26,685 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:27,116 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:27,584 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:27,770 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:31:27,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [695673402] [2021-05-06 11:31:27,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [695673402] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:31:27,770 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:31:27,770 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:31:27,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183100342] [2021-05-06 11:31:27,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:31:27,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:31:27,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:31:27,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:31:27,771 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 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 11:31:28,089 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-06 11:31:28,377 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-06 11:31:28,740 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:29,117 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:29,493 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:29,873 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:30,226 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:30,585 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:30,943 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:31,300 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:31,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:31:31,729 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-05-06 11:31:31,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:31:31,729 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 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 31 [2021-05-06 11:31:31,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:31:31,730 INFO L225 Difference]: With dead ends: 42 [2021-05-06 11:31:31,730 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 11:31:31,730 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 12 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 6422.2ms TimeCoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:31:31,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 11:31:31,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 11:31:31,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 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 11:31:31,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2021-05-06 11:31:31,737 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 31 [2021-05-06 11:31:31,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:31:31,737 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2021-05-06 11:31:31,737 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 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 11:31:31,737 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2021-05-06 11:31:31,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:31:31,738 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:31:31,738 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:31:31,738 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 11:31:31,738 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:31:31,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:31:31,738 INFO L82 PathProgramCache]: Analyzing trace with hash -361927345, now seen corresponding path program 9 times [2021-05-06 11:31:31,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:31:31,738 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944785004] [2021-05-06 11:31:31,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:31:31,770 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:31:31,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:31,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:31:31,899 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:31:31,984 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 11:31:31,991 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:31:32,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:32,030 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:32,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:31:32,294 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:31:32,372 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:31:32,681 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:31:32,681 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:31:32,682 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:31:32,685 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:31:32,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:32,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:35,036 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:31:35,170 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:31:35,324 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:31:35,403 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:31:35,522 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:31:35,792 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:31:36,202 WARN L205 SmtUtils]: Spent 409.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:31:36,203 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:31:36,206 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:31:36,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:36,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:36,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:31:36,407 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:31:36,448 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:31:36,538 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 11:31:36,539 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:31:36,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:36,836 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 11 [2021-05-06 11:31:37,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:31:37,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:37,140 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 11:31:37,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:31:37,291 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 11:31:37,735 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2021-05-06 11:31:38,017 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:38,351 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:38,701 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:39,084 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:39,514 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:40,007 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:40,479 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:40,977 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:31:41,185 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:31:41,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944785004] [2021-05-06 11:31:41,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [944785004] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:31:41,186 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:31:41,186 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:31:41,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050450714] [2021-05-06 11:31:41,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:31:41,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:31:41,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:31:41,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:31:41,187 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 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 11:31:41,506 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-06 11:31:41,778 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:42,143 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:42,555 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:42,971 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:43,370 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:43,789 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:44,210 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:44,611 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:45,035 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:45,424 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:31:45,794 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:31:45,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:31:45,900 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-06 11:31:45,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:31:45,901 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 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 33 [2021-05-06 11:31:45,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:31:45,901 INFO L225 Difference]: With dead ends: 44 [2021-05-06 11:31:45,901 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 11:31:45,901 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 13 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 7300.8ms TimeCoverageRelationStatistics Valid=141, Invalid=789, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:31:45,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 11:31:45,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-06 11:31:45,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.125) internal successors, (36), 32 states have internal predecessors, (36), 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 11:31:45,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2021-05-06 11:31:45,921 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 33 [2021-05-06 11:31:45,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:31:45,922 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2021-05-06 11:31:45,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 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 11:31:45,922 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2021-05-06 11:31:45,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 11:31:45,925 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:31:45,925 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:31:45,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 11:31:45,925 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:31:45,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:31:45,930 INFO L82 PathProgramCache]: Analyzing trace with hash 346157930, now seen corresponding path program 10 times [2021-05-06 11:31:45,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:31:45,930 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596838297] [2021-05-06 11:31:45,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:31:45,962 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:31:45,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:46,013 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:31:46,082 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:31:46,170 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 11:31:46,179 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:31:46,180 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:46,187 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:50,233 WARN L205 SmtUtils]: Spent 4.04 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:31:54,268 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:31:54,424 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:31:54,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:31:54,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:31:54,750 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:31:55,074 WARN L205 SmtUtils]: Spent 323.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:31:55,074 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:31:55,075 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:31:55,077 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:31:55,115 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:55,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:55,341 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:31:57,433 WARN L205 SmtUtils]: Spent 2.08 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:31:57,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:31:57,812 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:31:57,941 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2021-05-06 11:31:58,117 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2021-05-06 11:31:58,377 WARN L205 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2021-05-06 11:31:58,392 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:31:59,376 WARN L205 SmtUtils]: Spent 984.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-06 11:31:59,377 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:31:59,380 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:31:59,434 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:59,440 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:31:59,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:31:59,534 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:31:59,577 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:31:59,663 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 11:31:59,664 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:31:59,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:59,888 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 17 [2021-05-06 11:32:00,062 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:32:00,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:32:00,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:32:00,332 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 11:32:00,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:00,457 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 13 [2021-05-06 11:32:00,920 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 23 [2021-05-06 11:32:01,227 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:32:01,539 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:32:01,909 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:32:02,283 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:32:02,683 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:32:03,210 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:32:03,700 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:32:04,208 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:32:04,790 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:32:05,016 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:32:05,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596838297] [2021-05-06 11:32:05,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1596838297] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:32:05,016 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:32:05,016 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:32:05,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820992999] [2021-05-06 11:32:05,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:32:05,017 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:32:05,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:32:05,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:32:05,018 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 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 11:32:05,420 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-06 11:32:05,815 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-06 11:32:06,352 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:32:06,972 WARN L205 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:32:07,440 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:32:07,893 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:32:08,372 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:32:08,803 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:32:09,252 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:32:09,673 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:32:10,176 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:32:10,615 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:32:11,034 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:32:11,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:32:11,371 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-05-06 11:32:11,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:32:11,372 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 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 11:32:11,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:32:11,372 INFO L225 Difference]: With dead ends: 46 [2021-05-06 11:32:11,372 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 11:32:11,373 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 14 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 8647.4ms TimeCoverageRelationStatistics Valid=152, Invalid=904, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:32:11,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 11:32:11,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-06 11:32:11,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 34 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 11:32:11,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-05-06 11:32:11,380 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 35 [2021-05-06 11:32:11,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:32:11,380 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-05-06 11:32:11,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 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 11:32:11,380 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-05-06 11:32:11,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 11:32:11,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:32:11,381 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:32:11,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:32:11,381 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:32:11,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:32:11,381 INFO L82 PathProgramCache]: Analyzing trace with hash -2083692859, now seen corresponding path program 11 times [2021-05-06 11:32:11,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:32:11,381 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1152781640] [2021-05-06 11:32:11,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:32:11,425 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:32:11,426 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:32:11,463 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:32:11,529 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:32:11,614 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 11:32:11,622 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:32:11,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:32:11,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:32:15,594 WARN L205 SmtUtils]: Spent 3.97 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:32:15,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:32:15,735 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:32:15,856 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:32:15,989 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:32:15,989 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:32:15,991 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:32:15,994 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:32:16,033 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:32:16,039 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:32:16,353 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:32:16,603 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:32:16,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:32:16,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:32:16,896 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:32:17,239 WARN L205 SmtUtils]: Spent 343.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:32:17,239 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:32:17,244 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:32:17,294 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:32:17,295 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:32:17,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:32:17,387 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:32:17,425 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:32:17,514 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 11:32:17,515 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:32:17,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:32:17,717 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:32:18,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:32:18,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:32:18,099 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 11:32:18,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:20,461 WARN L205 SmtUtils]: Spent 2.36 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:32:25,086 WARN L205 SmtUtils]: Spent 2.10 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:32:25,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:27,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:31,798 WARN L205 SmtUtils]: Spent 2.29 s on a formula simplification that was a NOOP. DAG size: 64 [2021-05-06 11:32:31,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:34,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:39,599 WARN L205 SmtUtils]: Spent 5.29 s on a formula simplification. DAG size of input: 69 DAG size of output: 67 [2021-05-06 11:32:39,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:39,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:44,576 WARN L205 SmtUtils]: Spent 4.60 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:32:44,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:44,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:51,831 WARN L205 SmtUtils]: Spent 4.61 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:32:51,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:32:54,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:01,446 WARN L205 SmtUtils]: Spent 4.47 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:33:01,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:01,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:08,569 WARN L205 SmtUtils]: Spent 4.55 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:33:08,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:08,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:13,866 WARN L205 SmtUtils]: Spent 4.64 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:33:13,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:16,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:21,431 WARN L205 SmtUtils]: Spent 4.63 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:33:21,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:21,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:28,894 WARN L205 SmtUtils]: Spent 4.51 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:33:28,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:35,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:45,050 WARN L205 SmtUtils]: Spent 6.46 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:33:45,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:48,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:33:55,842 WARN L205 SmtUtils]: Spent 7.23 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:33:55,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:34:00,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:34:05,452 WARN L205 SmtUtils]: Spent 4.57 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 11:34:05,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:34:05,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:34:05,970 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:34:05,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1152781640] [2021-05-06 11:34:05,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1152781640] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:34:05,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:34:05,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:34:05,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126193315] [2021-05-06 11:34:05,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:34:05,970 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:34:05,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:34:05,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=382, Unknown=7, NotChecked=0, Total=462 [2021-05-06 11:34:05,971 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 states have internal predecessors, (33), 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 11:34:06,876 WARN L205 SmtUtils]: Spent 400.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 48 [2021-05-06 11:34:16,219 WARN L205 SmtUtils]: Spent 2.36 s on a formula simplification that was a NOOP. DAG size: 94 [2021-05-06 11:34:24,211 WARN L205 SmtUtils]: Spent 2.82 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:34:29,235 WARN L205 SmtUtils]: Spent 2.50 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:34:34,122 WARN L205 SmtUtils]: Spent 2.25 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:34:39,825 WARN L205 SmtUtils]: Spent 2.88 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:34:45,507 WARN L205 SmtUtils]: Spent 2.81 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:34:48,422 WARN L205 SmtUtils]: Spent 2.34 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:34:56,178 WARN L205 SmtUtils]: Spent 2.64 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:35:00,251 WARN L205 SmtUtils]: Spent 3.45 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:35:05,560 WARN L205 SmtUtils]: Spent 2.46 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:35:11,175 WARN L205 SmtUtils]: Spent 2.40 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:35:16,758 WARN L205 SmtUtils]: Spent 2.45 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 11:35:17,388 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:35:20,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:20,159 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2021-05-06 11:35:20,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:35:20,159 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 states have internal predecessors, (33), 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 37 [2021-05-06 11:35:20,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:20,160 INFO L225 Difference]: With dead ends: 48 [2021-05-06 11:35:20,160 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 11:35:20,160 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 14 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 151926.6ms TimeCoverageRelationStatistics Valid=169, Invalid=1079, Unknown=12, NotChecked=0, Total=1260 [2021-05-06 11:35:20,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 11:35:20,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-06 11:35:20,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 states have internal predecessors, (40), 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 11:35:20,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2021-05-06 11:35:20,170 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 37 [2021-05-06 11:35:20,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:20,170 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2021-05-06 11:35:20,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 states have internal predecessors, (33), 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 11:35:20,171 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2021-05-06 11:35:20,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 11:35:20,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:20,171 INFO L523 BasicCegarLoop]: trace histogram [14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:20,171 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 11:35:20,171 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:20,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:20,171 INFO L82 PathProgramCache]: Analyzing trace with hash -708092064, now seen corresponding path program 12 times [2021-05-06 11:35:20,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:20,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1564470282] [2021-05-06 11:35:20,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:20,200 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:35:20,201 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:20,240 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:35:20,310 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:35:20,403 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 11:35:20,410 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:35:20,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:20,412 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:20,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:35:20,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:20,702 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:35:20,938 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:35:20,938 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:20,939 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:35:20,941 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:35:20,942 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:20,943 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:21,275 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:35:21,547 WARN L205 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:35:21,648 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:35:21,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:35:21,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:35:22,142 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:35:23,083 WARN L205 SmtUtils]: Spent 940.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:35:23,084 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:23,086 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:35:23,087 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:23,088 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:25,157 WARN L205 SmtUtils]: Spent 2.07 s on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:35:25,204 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:35:25,219 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:35:25,305 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:35:25,395 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 11:35:25,396 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:35:25,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:25,660 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 15 [2021-05-06 11:35:26,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:26,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:26,042 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 11:35:26,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:28,421 WARN L205 SmtUtils]: Spent 2.38 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:35:28,822 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-06 11:35:29,151 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:29,524 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:29,947 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:30,380 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:30,864 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:31,378 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:31,915 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:32,529 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:33,160 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:33,806 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:34,560 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 11:35:34,880 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:34,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1564470282] [2021-05-06 11:35:34,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1564470282] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:34,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:34,881 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:35:34,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500821786] [2021-05-06 11:35:34,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:35:34,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:34,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:35:34,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:35:34,882 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 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 11:35:35,300 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-06 11:35:35,670 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-06 11:35:36,264 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:36,789 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:37,299 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:37,826 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:38,346 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:38,859 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:39,378 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:39,925 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:40,443 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:40,957 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:41,473 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:41,973 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-06 11:35:42,487 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:35:42,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:42,849 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2021-05-06 11:35:42,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:35:42,849 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 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 39 [2021-05-06 11:35:42,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:42,850 INFO L225 Difference]: With dead ends: 50 [2021-05-06 11:35:42,850 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 11:35:42,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 4 SyntacticMatches, 16 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 11201.1ms TimeCoverageRelationStatistics Valid=174, Invalid=1158, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:35:42,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 11:35:42,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-06 11:35:42,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.105263157894737) internal successors, (42), 38 states have internal predecessors, (42), 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 11:35:42,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2021-05-06 11:35:42,860 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 39 [2021-05-06 11:35:42,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:42,860 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2021-05-06 11:35:42,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 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 11:35:42,860 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2021-05-06 11:35:42,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:35:42,862 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:42,862 INFO L523 BasicCegarLoop]: trace histogram [15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:42,862 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:35:42,862 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:42,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:42,862 INFO L82 PathProgramCache]: Analyzing trace with hash -1605655237, now seen corresponding path program 13 times [2021-05-06 11:35:42,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:42,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477655967] [2021-05-06 11:35:42,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:42,894 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:35:42,895 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:42,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:35:43,000 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:35:43,091 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 11:35:43,098 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:35:43,133 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:43,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:47,168 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:35:51,200 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:35:53,649 WARN L205 SmtUtils]: Spent 2.45 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:35:53,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:35:53,757 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:53,821 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:35:53,980 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:35:53,981 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:53,982 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:35:53,984 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:35:53,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:53,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:54,533 WARN L205 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:35:54,656 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:35:54,717 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:35:54,927 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-06 11:35:55,170 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2021-05-06 11:35:55,221 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:35:56,184 WARN L205 SmtUtils]: Spent 962.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:35:56,185 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:56,187 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:35:56,188 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:56,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:56,329 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:35:56,344 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:35:56,435 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:35:56,532 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 11:35:56,533 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:35:56,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:56,696 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 11 [2021-05-06 11:35:57,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:57,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:57,095 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 11:35:57,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:59,344 WARN L205 SmtUtils]: Spent 2.25 s on a formula simplification that was a NOOP. DAG size: 59 [2021-05-06 11:36:08,860 WARN L205 SmtUtils]: Spent 2.25 s on a formula simplification that was a NOOP. DAG size: 59 [2021-05-06 11:36:08,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:11,734 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:12,095 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:12,464 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:12,857 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:13,294 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:13,774 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:14,267 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:14,831 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:15,449 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:16,085 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:16,719 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:17,394 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:36:17,660 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:17,660 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477655967] [2021-05-06 11:36:17,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [477655967] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:17,660 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:17,661 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:36:17,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951584479] [2021-05-06 11:36:17,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:36:17,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:17,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:36:17,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=467, Unknown=4, NotChecked=0, Total=552 [2021-05-06 11:36:17,661 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 20 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 11:36:18,285 WARN L205 SmtUtils]: Spent 339.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 48 [2021-05-06 11:36:23,274 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 11:36:28,240 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:28,736 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:29,229 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:29,731 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:30,205 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:30,721 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:31,188 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:31,660 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:32,160 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:32,668 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:33,140 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:33,629 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:34,119 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:36:34,564 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:36:34,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:34,698 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2021-05-06 11:36:34,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:36:34,699 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 20 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 11:36:34,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:34,699 INFO L225 Difference]: With dead ends: 52 [2021-05-06 11:36:34,699 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 11:36:34,700 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 4 SyntacticMatches, 16 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 26011.3ms TimeCoverageRelationStatistics Valid=191, Invalid=1364, Unknown=5, NotChecked=0, Total=1560 [2021-05-06 11:36:34,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 11:36:34,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-06 11:36:34,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.1) internal successors, (44), 40 states have internal predecessors, (44), 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 11:36:34,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-05-06 11:36:34,709 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2021-05-06 11:36:34,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:34,709 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-05-06 11:36:34,709 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 20 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 11:36:34,709 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-05-06 11:36:34,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 11:36:34,710 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:34,710 INFO L523 BasicCegarLoop]: trace histogram [16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:34,710 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:36:34,710 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:34,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:34,710 INFO L82 PathProgramCache]: Analyzing trace with hash -875437994, now seen corresponding path program 14 times [2021-05-06 11:36:34,710 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:34,710 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669714362] [2021-05-06 11:36:34,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:34,738 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:36:34,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:34,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:36:34,854 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:36:34,942 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 11:36:34,949 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:36:34,949 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:34,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:35,531 WARN L205 SmtUtils]: Spent 437.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:36:35,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:36:35,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:35,688 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:36:35,851 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:36:35,852 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:35,853 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:35,855 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:36:35,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:35,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:36,946 WARN L205 SmtUtils]: Spent 1.09 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:36:37,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:36:37,476 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:36:37,848 WARN L205 SmtUtils]: Spent 323.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-06 11:36:38,051 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:36:38,578 WARN L205 SmtUtils]: Spent 527.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:36:38,579 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:38,581 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:38,582 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:38,583 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:38,702 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:36:38,715 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:36:38,797 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:36:38,881 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 11:36:38,882 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:38,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:39,058 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 9 [2021-05-06 11:36:39,228 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:36:39,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:39,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:39,499 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 11:36:39,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:39,620 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 13 [2021-05-06 11:36:40,030 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2021-05-06 11:36:40,289 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:40,593 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:40,905 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:41,254 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:41,622 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:42,020 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:42,449 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:42,904 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:43,401 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:43,937 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:44,508 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:45,104 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:45,733 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:36:45,982 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:45,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [669714362] [2021-05-06 11:36:45,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [669714362] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:45,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:45,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:36:45,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988493751] [2021-05-06 11:36:45,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:36:45,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:45,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:36:45,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:36:45,984 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 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 11:36:46,336 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:36:46,625 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:47,030 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:47,524 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:48,000 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:48,470 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:48,938 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:49,411 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:49,881 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:50,357 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:50,828 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:51,297 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:51,750 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:52,201 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:52,645 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:53,088 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:36:53,522 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:36:53,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:53,613 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2021-05-06 11:36:53,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:36:53,614 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 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 43 [2021-05-06 11:36:53,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:53,614 INFO L225 Difference]: With dead ends: 54 [2021-05-06 11:36:53,614 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 11:36:53,614 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 4 SyntacticMatches, 18 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 11264.2ms TimeCoverageRelationStatistics Valid=196, Invalid=1444, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:36:53,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 11:36:53,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-06 11:36:53,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 42 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 11:36:53,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2021-05-06 11:36:53,624 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 43 [2021-05-06 11:36:53,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:53,624 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2021-05-06 11:36:53,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 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 11:36:53,625 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2021-05-06 11:36:53,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 11:36:53,627 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:53,627 INFO L523 BasicCegarLoop]: trace histogram [17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:53,627 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-06 11:36:53,627 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:53,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:53,627 INFO L82 PathProgramCache]: Analyzing trace with hash 783663281, now seen corresponding path program 15 times [2021-05-06 11:36:53,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:53,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314836149] [2021-05-06 11:36:53,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:53,655 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:36:53,655 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:53,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:36:53,764 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:36:53,848 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 11:36:53,855 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:36:53,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:53,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:55,751 WARN L205 SmtUtils]: Spent 1.89 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:36:55,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:36:55,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:56,000 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:36:56,183 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:36:56,183 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:56,184 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:56,186 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:36:56,227 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:56,228 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:56,601 WARN L205 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:36:56,782 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:36:57,897 WARN L205 SmtUtils]: Spent 1.00 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:36:58,172 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:36:58,287 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:36:58,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:36:58,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:36:58,568 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2021-05-06 11:36:58,758 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:36:59,246 WARN L205 SmtUtils]: Spent 487.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:36:59,246 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:59,249 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:59,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:59,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:59,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:36:59,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:36:59,418 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:36:59,503 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 11:36:59,504 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:59,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:59,664 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 9 [2021-05-06 11:36:59,836 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:37:00,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:00,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:00,096 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 11:37:00,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:00,269 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 13 [2021-05-06 11:37:00,680 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2021-05-06 11:37:00,940 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:01,237 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:01,569 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:01,923 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:02,293 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:02,698 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:03,128 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:03,605 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:04,118 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:04,641 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:05,182 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:05,745 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:06,366 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:07,001 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:37:07,259 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:07,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314836149] [2021-05-06 11:37:07,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1314836149] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:07,259 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:07,259 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:37:07,259 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55054463] [2021-05-06 11:37:07,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:37:07,260 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:07,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:37:07,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:37:07,260 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 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 11:37:07,656 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:37:07,984 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:08,475 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:08,976 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:09,484 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:09,968 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:10,458 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:10,947 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:11,448 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:11,947 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:12,442 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:12,937 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:13,395 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:13,863 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:14,337 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:14,805 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:15,253 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:37:15,740 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:37:15,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:15,955 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2021-05-06 11:37:15,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:37:15,956 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 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 45 [2021-05-06 11:37:15,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:15,956 INFO L225 Difference]: With dead ends: 56 [2021-05-06 11:37:15,956 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 11:37:15,956 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 4 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 12252.7ms TimeCoverageRelationStatistics Valid=207, Invalid=1599, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:37:15,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 11:37:15,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-06 11:37:15,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 states have internal predecessors, (48), 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 11:37:15,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2021-05-06 11:37:15,966 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 45 [2021-05-06 11:37:15,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:15,966 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2021-05-06 11:37:15,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 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 11:37:15,966 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2021-05-06 11:37:15,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:37:15,966 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:15,966 INFO L523 BasicCegarLoop]: trace histogram [18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:15,966 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-06 11:37:15,966 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:15,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:15,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1747121740, now seen corresponding path program 16 times [2021-05-06 11:37:15,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:15,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190471420] [2021-05-06 11:37:15,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:15,993 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:37:16,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:16,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:37:16,097 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:37:16,181 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 11:37:16,188 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:37:16,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:16,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:17,174 WARN L205 SmtUtils]: Spent 982.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:37:17,255 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:37:17,269 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:17,379 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:37:17,656 WARN L205 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:37:17,657 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:17,658 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:17,659 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:37:17,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:17,661 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:19,896 WARN L205 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:37:21,928 WARN L205 SmtUtils]: Spent 1.99 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:37:25,810 WARN L205 SmtUtils]: Spent 3.88 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:37:25,965 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:37:26,258 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:37:26,562 WARN L205 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:37:26,734 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:37:26,735 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:37:26,863 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 11:37:26,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:37:27,266 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-06 11:37:27,332 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:37:27,762 WARN L205 SmtUtils]: Spent 429.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:37:27,762 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:27,767 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:27,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:27,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:27,884 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:37:27,896 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:37:27,978 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:37:28,071 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 11:37:28,072 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:28,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:28,238 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 14 [2021-05-06 11:37:28,418 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:37:28,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:28,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:28,703 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 11:37:28,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:28,834 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 13 [2021-05-06 11:37:29,285 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2021-05-06 11:37:29,554 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:29,873 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:30,214 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:30,615 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:31,024 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:31,458 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:31,925 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:32,419 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:32,949 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:33,540 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:34,213 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:34,871 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:35,561 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:36,270 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:37,018 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:37:37,335 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:37,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190471420] [2021-05-06 11:37:37,335 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [190471420] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:37,335 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:37,335 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:37:37,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471986993] [2021-05-06 11:37:37,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:37:37,335 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:37,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:37:37,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=562, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:37:37,336 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 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 11:37:37,715 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-06 11:37:38,007 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:38,493 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:39,055 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:39,610 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:40,162 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:40,696 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:41,238 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:41,777 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:42,329 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:42,850 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:43,380 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:43,936 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:44,475 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:45,026 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:45,585 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:46,144 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:46,681 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:37:47,221 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:37:47,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:47,312 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-06 11:37:47,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:37:47,312 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 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 11:37:47,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:47,313 INFO L225 Difference]: With dead ends: 58 [2021-05-06 11:37:47,313 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 11:37:47,313 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 4 SyntacticMatches, 20 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 14523.9ms TimeCoverageRelationStatistics Valid=218, Invalid=1762, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:37:47,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 11:37:47,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-06 11:37:47,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 46 states have internal predecessors, (50), 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 11:37:47,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2021-05-06 11:37:47,323 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 47 [2021-05-06 11:37:47,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:47,323 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2021-05-06 11:37:47,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 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 11:37:47,323 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2021-05-06 11:37:47,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:37:47,323 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:47,323 INFO L523 BasicCegarLoop]: trace histogram [19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:47,323 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:37:47,323 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:47,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:47,323 INFO L82 PathProgramCache]: Analyzing trace with hash -82235097, now seen corresponding path program 17 times [2021-05-06 11:37:47,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:47,324 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989058039] [2021-05-06 11:37:47,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:47,351 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:37:47,385 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:47,423 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:37:47,456 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:37:47,542 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 11:37:47,549 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:37:47,584 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:47,586 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:48,360 WARN L205 SmtUtils]: Spent 770.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:37:48,472 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:37:48,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:48,559 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:37:48,853 WARN L205 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:37:48,853 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:48,854 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:48,856 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:37:48,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:48,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:51,452 WARN L205 SmtUtils]: Spent 2.59 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:37:52,458 WARN L205 SmtUtils]: Spent 1.01 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:37:56,527 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:37:58,440 WARN L205 SmtUtils]: Spent 1.91 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:37:58,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:37:58,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:37:58,992 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:37:59,468 WARN L205 SmtUtils]: Spent 475.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:37:59,469 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:59,471 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:59,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:59,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:59,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:37:59,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:37:59,668 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:37:59,750 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 11:37:59,751 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:59,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:59,960 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 14 [2021-05-06 11:38:00,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:00,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:00,321 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 11:38:00,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:02,632 WARN L205 SmtUtils]: Spent 2.31 s on a formula simplification that was a NOOP. DAG size: 61 [2021-05-06 11:38:09,648 WARN L205 SmtUtils]: Spent 2.13 s on a formula simplification that was a NOOP. DAG size: 61 [2021-05-06 11:38:09,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:12,124 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2021-05-06 11:38:12,424 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:12,741 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:13,073 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:13,424 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:13,821 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:14,258 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:14,745 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:15,266 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:15,795 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:16,400 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:17,018 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:17,677 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:18,404 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:19,159 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:19,933 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:20,733 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:21,050 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:21,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989058039] [2021-05-06 11:38:21,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1989058039] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:21,051 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:21,051 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:38:21,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947591610] [2021-05-06 11:38:21,051 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:38:21,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:21,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:38:21,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=656, Unknown=3, NotChecked=0, Total=756 [2021-05-06 11:38:21,051 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand has 26 states, 25 states have (on average 1.8) internal successors, (45), 24 states have internal predecessors, (45), 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 11:38:21,761 WARN L205 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 48 [2021-05-06 11:38:26,610 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:36,044 WARN L205 SmtUtils]: Spent 7.07 s on a formula simplification. DAG size of input: 103 DAG size of output: 89 [2021-05-06 11:38:38,868 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:39,456 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:40,099 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:40,743 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:41,319 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:41,902 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:42,482 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:43,045 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:43,613 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:44,198 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:44,786 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:45,427 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:46,018 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:46,637 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:47,212 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:47,792 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:48,367 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:38:48,918 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:38:49,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:49,012 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2021-05-06 11:38:49,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:38:49,013 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.8) internal successors, (45), 24 states have internal predecessors, (45), 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 49 [2021-05-06 11:38:49,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:49,013 INFO L225 Difference]: With dead ends: 60 [2021-05-06 11:38:49,013 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 11:38:49,014 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 4 SyntacticMatches, 20 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 37277.5ms TimeCoverageRelationStatistics Valid=243, Invalid=2104, Unknown=5, NotChecked=0, Total=2352 [2021-05-06 11:38:49,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 11:38:49,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-06 11:38:49,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 48 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 11:38:49,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2021-05-06 11:38:49,032 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2021-05-06 11:38:49,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:49,032 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2021-05-06 11:38:49,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.8) internal successors, (45), 24 states have internal predecessors, (45), 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 11:38:49,032 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2021-05-06 11:38:49,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:38:49,032 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:49,032 INFO L523 BasicCegarLoop]: trace histogram [20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:49,033 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-06 11:38:49,034 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:49,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:49,034 INFO L82 PathProgramCache]: Analyzing trace with hash -1452531390, now seen corresponding path program 18 times [2021-05-06 11:38:49,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:49,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1951709879] [2021-05-06 11:38:49,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:49,062 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:38:49,062 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:49,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:38:49,176 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:38:49,261 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 11:38:49,268 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:38:49,302 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:49,319 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:49,826 WARN L205 SmtUtils]: Spent 503.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:38:49,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:38:49,934 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:38:50,011 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:38:50,180 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:38:50,181 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:50,182 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:38:50,184 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:38:50,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:50,225 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:50,744 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:38:50,999 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:38:51,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:38:51,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:38:51,283 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:38:51,705 WARN L205 SmtUtils]: Spent 421.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:38:51,705 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:51,708 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:38:51,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:51,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:51,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:38:51,813 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:38:51,901 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:38:51,990 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 11:38:51,991 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:38:51,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:52,249 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 16 [2021-05-06 11:38:52,425 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:38:52,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:52,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:52,697 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 11:38:52,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:52,828 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 11:38:53,290 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 23 [2021-05-06 11:38:53,575 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:53,894 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:54,273 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:54,670 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:55,110 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:55,573 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:56,082 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:56,656 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:57,225 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:57,841 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:58,489 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:59,169 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:38:59,851 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:00,574 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:01,342 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:02,154 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:03,016 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:03,363 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:03,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1951709879] [2021-05-06 11:39:03,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1951709879] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:03,363 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:03,363 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:39:03,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150507656] [2021-05-06 11:39:03,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:39:03,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:03,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:39:03,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=660, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:39:03,364 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 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 11:39:03,788 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-06 11:39:04,125 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-06 11:39:04,681 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:05,329 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:05,955 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:06,588 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:07,184 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:07,817 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:08,410 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:09,004 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:09,568 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:10,176 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:10,794 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:11,368 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:11,959 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:12,541 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:13,143 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:13,717 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:14,298 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:14,887 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:15,420 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:39:15,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:15,591 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-05-06 11:39:15,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:39:15,591 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 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 51 [2021-05-06 11:39:15,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:15,592 INFO L225 Difference]: With dead ends: 62 [2021-05-06 11:39:15,592 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 11:39:15,592 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 4 SyntacticMatches, 22 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 17645.2ms TimeCoverageRelationStatistics Valid=240, Invalid=2112, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:39:15,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 11:39:15,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-06 11:39:15,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.08) internal successors, (54), 50 states have internal predecessors, (54), 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 11:39:15,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2021-05-06 11:39:15,602 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 51 [2021-05-06 11:39:15,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:15,602 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2021-05-06 11:39:15,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 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 11:39:15,602 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2021-05-06 11:39:15,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 11:39:15,602 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:15,603 INFO L523 BasicCegarLoop]: trace histogram [21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:15,603 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-06 11:39:15,603 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:15,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:15,603 INFO L82 PathProgramCache]: Analyzing trace with hash 247690909, now seen corresponding path program 19 times [2021-05-06 11:39:15,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:15,603 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455900303] [2021-05-06 11:39:15,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:15,632 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:39:15,633 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:15,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:39:15,737 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:39:15,822 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 11:39:15,828 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:39:15,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:15,830 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:18,793 WARN L205 SmtUtils]: Spent 2.96 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:39:18,876 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:39:18,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:39:19,006 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:39:19,693 WARN L205 SmtUtils]: Spent 686.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:39:19,693 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:19,694 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:39:19,696 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:39:19,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:19,736 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:20,000 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:39:20,543 WARN L205 SmtUtils]: Spent 542.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:39:20,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:39:20,709 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:39:21,261 WARN L205 SmtUtils]: Spent 478.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-06 11:39:21,342 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:39:21,691 WARN L205 SmtUtils]: Spent 348.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:39:21,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:21,695 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:39:21,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:21,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:21,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:39:21,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:39:21,877 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:39:21,962 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 11:39:21,963 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:39:21,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:22,175 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2021-05-06 11:39:22,341 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:39:22,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:22,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:22,599 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 11:39:22,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:22,715 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 11:39:23,296 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:23,616 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:23,952 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:24,335 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:24,749 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:25,193 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:25,667 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:26,191 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:26,766 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:27,354 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:27,977 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:28,610 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:29,293 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:30,032 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:30,784 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:39:31,853 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2021-05-06 11:39:32,617 WARN L205 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2021-05-06 11:39:33,334 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-06 11:39:33,772 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:33,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455900303] [2021-05-06 11:39:33,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1455900303] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:33,772 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:33,772 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:39:33,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170960368] [2021-05-06 11:39:33,773 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:39:33,773 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:33,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:39:33,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:39:33,773 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 31 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 29 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 11:39:34,172 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 11:39:34,503 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 11:39:34,939 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:35,424 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:35,899 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:36,424 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:36,914 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:37,429 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:37,956 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:38,474 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:38,965 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:39,482 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:40,008 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:40,510 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:41,002 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:41,507 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:39:41,976 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52