/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/phases_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-b7b32d2 [2021-02-21 21:18:41,911 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-21 21:18:41,914 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-21 21:18:41,977 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-02-21 21:18:41,978 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-02-21 21:18:41,983 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-02-21 21:18:41,987 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-02-21 21:18:41,997 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-02-21 21:18:42,001 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-02-21 21:18:42,009 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-02-21 21:18:42,011 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-02-21 21:18:42,013 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-02-21 21:18:42,014 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-21 21:18:42,017 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-21 21:18:42,020 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-21 21:18:42,039 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-21 21:18:42,041 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-21 21:18:42,042 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-21 21:18:42,044 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-21 21:18:42,046 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-21 21:18:42,048 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-21 21:18:42,054 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-21 21:18:42,056 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-21 21:18:42,058 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-21 21:18:42,067 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-21 21:18:42,081 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-21 21:18:42,082 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-21 21:18:42,083 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-21 21:18:42,084 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2021-02-21 21:18:42,106 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-21 21:18:42,107 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-21 21:18:42,112 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-21 21:18:42,113 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-21 21:18:42,113 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-21 21:18:42,113 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-21 21:18:42,113 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-21 21:18:42,113 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-21 21:18:42,114 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-21 21:18:42,114 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-21 21:18:42,116 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-21 21:18:42,116 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-21 21:18:42,117 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-21 21:18:42,117 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-21 21:18:42,117 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-21 21:18:42,117 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-21 21:18:42,118 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-21 21:18:42,118 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-21 21:18:42,118 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-21 21:18:42,118 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-21 21:18:42,119 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-21 21:18:42,119 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-21 21:18:42,119 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-21 21:18:42,536 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-21 21:18:42,582 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-21 21:18:42,586 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-21 21:18:42,588 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-21 21:18:42,588 INFO L275 PluginConnector]: CDTParser initialized [2021-02-21 21:18:42,590 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_2-2.c [2021-02-21 21:18:42,677 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2be884ac5/55fd68516c5a40c18a385d380f0044d2/FLAGbf63b1704 [2021-02-21 21:18:43,415 INFO L306 CDTParser]: Found 1 translation units. [2021-02-21 21:18:43,416 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_2-2.c [2021-02-21 21:18:43,423 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2be884ac5/55fd68516c5a40c18a385d380f0044d2/FLAGbf63b1704 [2021-02-21 21:18:43,786 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2be884ac5/55fd68516c5a40c18a385d380f0044d2 [2021-02-21 21:18:43,789 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-21 21:18:43,804 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-21 21:18:43,806 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-21 21:18:43,806 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-21 21:18:43,811 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-21 21:18:43,812 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.02 09:18:43" (1/1) ... [2021-02-21 21:18:43,814 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3862f503 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:43, skipping insertion in model container [2021-02-21 21:18:43,814 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.02 09:18:43" (1/1) ... [2021-02-21 21:18:43,824 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-21 21:18:43,841 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-21 21:18:44,014 WARN L226 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_2-2.c[459,472] [2021-02-21 21:18:44,033 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-21 21:18:44,045 INFO L203 MainTranslator]: Completed pre-run [2021-02-21 21:18:44,060 WARN L226 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_2-2.c[459,472] [2021-02-21 21:18:44,064 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-21 21:18:44,082 INFO L208 MainTranslator]: Completed translation [2021-02-21 21:18:44,083 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:44 WrapperNode [2021-02-21 21:18:44,083 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-21 21:18:44,084 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-21 21:18:44,084 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-21 21:18:44,085 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-21 21:18:44,098 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:44" (1/1) ... [2021-02-21 21:18:44,099 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:44" (1/1) ... [2021-02-21 21:18:44,106 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:44" (1/1) ... [2021-02-21 21:18:44,106 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:44" (1/1) ... [2021-02-21 21:18:44,112 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:44" (1/1) ... [2021-02-21 21:18:44,117 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:44" (1/1) ... [2021-02-21 21:18:44,119 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:44" (1/1) ... [2021-02-21 21:18:44,122 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-21 21:18:44,123 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-21 21:18:44,123 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-21 21:18:44,123 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-21 21:18:44,124 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:44" (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 [2021-02-21 21:18:44,222 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-21 21:18:44,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-21 21:18:44,223 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-21 21:18:44,223 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-02-21 21:18:44,223 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-21 21:18:44,224 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-21 21:18:44,224 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-21 21:18:44,224 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-21 21:18:44,224 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-21 21:18:44,224 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-21 21:18:44,224 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-02-21 21:18:44,225 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-02-21 21:18:44,225 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-21 21:18:44,225 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-21 21:18:44,225 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-21 21:18:44,225 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-21 21:18:44,225 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-21 21:18:44,226 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-21 21:18:44,226 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-21 21:18:44,226 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-21 21:18:44,601 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-21 21:18:44,601 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-21 21:18:44,608 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.02 09:18:44 BoogieIcfgContainer [2021-02-21 21:18:44,608 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-21 21:18:44,611 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-21 21:18:44,611 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-21 21:18:44,622 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-21 21:18:44,624 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.02 09:18:43" (1/3) ... [2021-02-21 21:18:44,625 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ffbd39b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.02 09:18:44, skipping insertion in model container [2021-02-21 21:18:44,626 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 09:18:44" (2/3) ... [2021-02-21 21:18:44,626 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ffbd39b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.02 09:18:44, skipping insertion in model container [2021-02-21 21:18:44,626 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.02 09:18:44" (3/3) ... [2021-02-21 21:18:44,632 INFO L111 eAbstractionObserver]: Analyzing ICFG phases_2-2.c [2021-02-21 21:18:44,652 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-21 21:18:44,657 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-21 21:18:44,679 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-21 21:18:44,733 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-21 21:18:44,734 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-21 21:18:44,734 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-21 21:18:44,734 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-21 21:18:44,734 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-21 21:18:44,734 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-21 21:18:44,735 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-21 21:18:44,735 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-21 21:18:44,763 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2021-02-21 21:18:44,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-02-21 21:18:44,780 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 21:18:44,780 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-21 21:18:44,781 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 21:18:44,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 21:18:44,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1523584107, now seen corresponding path program 1 times [2021-02-21 21:18:44,808 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-21 21:18:44,808 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120110382] [2021-02-21 21:18:44,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 21:18:44,906 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-21 21:18:45,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 21:18:45,133 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 21:18:45,135 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 21:18:45,136 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 21:18:45,137 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 21:18:45,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-21 21:18:45,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 21:18:45,276 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 21:18:45,278 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 21:18:45,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-21 21:18:45,296 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120110382] [2021-02-21 21:18:45,299 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-21 21:18:45,300 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-21 21:18:45,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836483313] [2021-02-21 21:18:45,308 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-21 21:18:45,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-21 21:18:45,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-21 21:18:45,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-21 21:18:45,331 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2021-02-21 21:18:45,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-21 21:18:45,489 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-02-21 21:18:45,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-21 21:18:45,492 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2021-02-21 21:18:45,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-21 21:18:45,505 INFO L225 Difference]: With dead ends: 46 [2021-02-21 21:18:45,506 INFO L226 Difference]: Without dead ends: 27 [2021-02-21 21:18:45,510 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-21 21:18:45,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-02-21 21:18:45,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-02-21 21:18:45,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2021-02-21 21:18:45,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-02-21 21:18:45,601 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 21 [2021-02-21 21:18:45,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-21 21:18:45,602 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-02-21 21:18:45,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-02-21 21:18:45,603 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-02-21 21:18:45,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-02-21 21:18:45,605 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 21:18:45,605 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-21 21:18:45,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-21 21:18:45,607 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 21:18:45,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 21:18:45,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1510654813, now seen corresponding path program 1 times [2021-02-21 21:18:45,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-21 21:18:45,611 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153219353] [2021-02-21 21:18:45,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 21:18:45,631 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-21 21:18:45,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 21:18:45,825 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 21:18:45,827 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 21:18:45,829 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 21:18:45,830 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-02-21 21:18:45,836 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 21:18:45,837 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-02-21 21:18:45,862 WARN L141 QuantifierPusher]: treesize reduction 3, result has 92.5 percent of original size [2021-02-21 21:18:45,867 WARN L147 QuantifierPusher]: treesize reduction 3, result has 92.5 percent of original size 37 [2021-02-21 21:18:45,907 WARN L141 QuantifierPusher]: treesize reduction 21, result has 77.2 percent of original size [2021-02-21 21:18:45,912 WARN L147 QuantifierPusher]: treesize reduction 21, result has 77.2 percent of original size 71 [2021-02-21 21:18:45,982 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 21:18:45,984 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-21 21:18:45,996 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 21:18:45,999 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-21 21:18:46,008 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 21:18:46,010 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 21:18:46,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-21 21:18:46,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 21:18:46,095 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 21:18:46,096 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 21:18:46,100 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-21 21:18:46,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153219353] [2021-02-21 21:18:46,103 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-21 21:18:46,104 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-02-21 21:18:46,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737936557] [2021-02-21 21:18:46,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-21 21:18:46,106 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-21 21:18:46,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-21 21:18:46,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-02-21 21:18:46,110 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2021-02-21 21:18:46,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-21 21:18:46,482 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2021-02-21 21:18:46,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-21 21:18:46,483 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2021-02-21 21:18:46,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-21 21:18:46,485 INFO L225 Difference]: With dead ends: 37 [2021-02-21 21:18:46,485 INFO L226 Difference]: Without dead ends: 32 [2021-02-21 21:18:46,487 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-02-21 21:18:46,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-02-21 21:18:46,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2021-02-21 21:18:46,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2021-02-21 21:18:46,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-02-21 21:18:46,500 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 21 [2021-02-21 21:18:46,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-21 21:18:46,501 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-02-21 21:18:46,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-02-21 21:18:46,501 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-02-21 21:18:46,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-21 21:18:46,502 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 21:18:46,503 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-21 21:18:46,503 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-21 21:18:46,503 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 21:18:46,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 21:18:46,504 INFO L82 PathProgramCache]: Analyzing trace with hash -2050410236, now seen corresponding path program 1 times [2021-02-21 21:18:46,504 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-21 21:18:46,505 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202138247] [2021-02-21 21:18:46,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY