/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 --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-24 00:16:48,460 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-24 00:16:48,462 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-24 00:16:48,516 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-24 00:16:48,606 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2021-02-24 00:16:48,634 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-24 00:16:48,634 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-24 00:16:48,639 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-24 00:16:48,639 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-24 00:16:48,640 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-24 00:16:48,640 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-24 00:16:48,640 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-24 00:16:48,640 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-24 00:16:48,641 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-24 00:16:48,641 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-24 00:16:48,642 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-24 00:16:48,642 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-24 00:16:48,643 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-24 00:16:48,643 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-24 00:16:48,643 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-24 00:16:48,644 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-24 00:16:48,644 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-24 00:16:48,644 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-24 00:16:48,644 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-24 00:16:48,644 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-24 00:16:48,645 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-24 00:16:48,645 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-24 00:16:48,645 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2021-02-24 00:16:49,112 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-24 00:16:49,162 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-24 00:16:49,166 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-24 00:16:49,167 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-24 00:16:49,168 INFO L275 PluginConnector]: CDTParser initialized [2021-02-24 00:16:49,169 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2021-02-24 00:16:49,252 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fdf537fe6/246c96812ec944ee9412f1b4947c58ba/FLAG66941ddbf [2021-02-24 00:16:49,886 INFO L306 CDTParser]: Found 1 translation units. [2021-02-24 00:16:49,887 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2021-02-24 00:16:49,894 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fdf537fe6/246c96812ec944ee9412f1b4947c58ba/FLAG66941ddbf [2021-02-24 00:16:50,253 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fdf537fe6/246c96812ec944ee9412f1b4947c58ba [2021-02-24 00:16:50,256 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-24 00:16:50,275 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-24 00:16:50,281 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-24 00:16:50,281 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-24 00:16:50,286 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-24 00:16:50,287 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 12:16:50" (1/1) ... [2021-02-24 00:16:50,289 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@10c71473 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50, skipping insertion in model container [2021-02-24 00:16:50,289 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 12:16:50" (1/1) ... [2021-02-24 00:16:50,300 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-24 00:16:50,320 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-24 00:16:50,546 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i[834,847] [2021-02-24 00:16:50,563 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-24 00:16:50,573 INFO L203 MainTranslator]: Completed pre-run [2021-02-24 00:16:50,588 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i[834,847] [2021-02-24 00:16:50,591 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-24 00:16:50,608 INFO L208 MainTranslator]: Completed translation [2021-02-24 00:16:50,609 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50 WrapperNode [2021-02-24 00:16:50,609 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-24 00:16:50,610 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-24 00:16:50,610 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-24 00:16:50,610 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-24 00:16:50,623 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50" (1/1) ... [2021-02-24 00:16:50,624 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50" (1/1) ... [2021-02-24 00:16:50,631 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50" (1/1) ... [2021-02-24 00:16:50,632 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50" (1/1) ... [2021-02-24 00:16:50,638 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50" (1/1) ... [2021-02-24 00:16:50,642 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50" (1/1) ... [2021-02-24 00:16:50,644 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50" (1/1) ... [2021-02-24 00:16:50,646 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-24 00:16:50,647 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-24 00:16:50,648 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-24 00:16:50,648 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-24 00:16:50,649 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50" (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 [2021-02-24 00:16:50,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-24 00:16:50,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-24 00:16:50,751 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-24 00:16:50,751 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-24 00:16:50,751 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-24 00:16:50,751 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-24 00:16:50,751 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-24 00:16:50,751 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-02-24 00:16:50,752 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-02-24 00:16:50,752 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-24 00:16:50,752 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-24 00:16:50,752 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-24 00:16:50,752 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-02-24 00:16:50,753 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-24 00:16:50,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-24 00:16:50,753 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-24 00:16:50,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-24 00:16:50,753 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-24 00:16:50,753 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-24 00:16:50,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-24 00:16:51,054 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-24 00:16:51,054 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-24 00:16:51,057 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 12:16:51 BoogieIcfgContainer [2021-02-24 00:16:51,057 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-24 00:16:51,059 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-24 00:16:51,059 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-24 00:16:51,064 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-24 00:16:51,065 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.02 12:16:50" (1/3) ... [2021-02-24 00:16:51,066 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bd8c5ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 12:16:51, skipping insertion in model container [2021-02-24 00:16:51,067 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 12:16:50" (2/3) ... [2021-02-24 00:16:51,067 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bd8c5ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 12:16:51, skipping insertion in model container [2021-02-24 00:16:51,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 12:16:51" (3/3) ... [2021-02-24 00:16:51,070 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01_bug02_sum01_bug02_base.case.i [2021-02-24 00:16:51,079 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-24 00:16:51,085 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-24 00:16:51,112 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-24 00:16:51,151 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-24 00:16:51,152 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-24 00:16:51,152 INFO L378 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2021-02-24 00:16:51,152 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-24 00:16:51,152 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-24 00:16:51,152 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-24 00:16:51,153 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-24 00:16:51,153 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-24 00:16:51,200 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2021-02-24 00:16:51,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-02-24 00:16:51,214 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 00:16:51,215 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] [2021-02-24 00:16:51,215 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 00:16:51,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 00:16:51,223 INFO L82 PathProgramCache]: Analyzing trace with hash -143449552, now seen corresponding path program 1 times [2021-02-24 00:16:51,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 00:16:51,253 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409567379] [2021-02-24 00:16:51,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 00:16:51,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:51,473 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:51,475 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:51,476 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:51,478 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:51,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-24 00:16:51,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:51,567 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:51,568 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:51,574 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-24 00:16:51,575 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409567379] [2021-02-24 00:16:51,577 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-24 00:16:51,577 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-24 00:16:51,580 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780920617] [2021-02-24 00:16:51,587 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-24 00:16:51,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-24 00:16:51,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-24 00:16:51,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-24 00:16:51,611 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2021-02-24 00:16:51,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-24 00:16:51,789 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-02-24 00:16:51,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-24 00:16:51,793 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2021-02-24 00:16:51,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-24 00:16:51,803 INFO L225 Difference]: With dead ends: 46 [2021-02-24 00:16:51,803 INFO L226 Difference]: Without dead ends: 28 [2021-02-24 00:16:51,807 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 [2021-02-24 00:16:51,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-02-24 00:16:51,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-02-24 00:16:51,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2021-02-24 00:16:51,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-02-24 00:16:51,880 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 21 [2021-02-24 00:16:51,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-24 00:16:51,880 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-02-24 00:16:51,881 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-02-24 00:16:51,881 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-02-24 00:16:51,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-02-24 00:16:51,883 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 00:16:51,883 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] [2021-02-24 00:16:51,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-24 00:16:51,884 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 00:16:51,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 00:16:51,885 INFO L82 PathProgramCache]: Analyzing trace with hash -157302367, now seen corresponding path program 1 times [2021-02-24 00:16:51,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 00:16:51,887 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2042493933] [2021-02-24 00:16:51,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 00:16:51,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:52,049 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,051 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:52,064 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,067 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-02-24 00:16:52,082 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,082 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-24 00:16:52,089 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,090 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-24 00:16:52,097 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,097 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:52,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-24 00:16:52,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:52,157 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,158 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:52,165 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-24 00:16:52,166 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2042493933] [2021-02-24 00:16:52,166 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-24 00:16:52,166 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-24 00:16:52,166 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887038310] [2021-02-24 00:16:52,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-24 00:16:52,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-24 00:16:52,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-24 00:16:52,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-02-24 00:16:52,173 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 6 states. [2021-02-24 00:16:52,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-24 00:16:52,429 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2021-02-24 00:16:52,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-24 00:16:52,429 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2021-02-24 00:16:52,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-24 00:16:52,431 INFO L225 Difference]: With dead ends: 35 [2021-02-24 00:16:52,431 INFO L226 Difference]: Without dead ends: 30 [2021-02-24 00:16:52,432 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-02-24 00:16:52,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-02-24 00:16:52,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-02-24 00:16:52,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2021-02-24 00:16:52,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-02-24 00:16:52,449 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 21 [2021-02-24 00:16:52,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-24 00:16:52,450 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-02-24 00:16:52,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-24 00:16:52,450 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-02-24 00:16:52,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-02-24 00:16:52,451 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 00:16:52,452 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, 1] [2021-02-24 00:16:52,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-24 00:16:52,452 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 00:16:52,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 00:16:52,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1837920541, now seen corresponding path program 1 times [2021-02-24 00:16:52,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 00:16:52,453 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2046850507] [2021-02-24 00:16:52,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 00:16:52,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:52,535 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,536 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:52,537 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,537 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-24 00:16:52,542 WARN L141 QuantifierPusher]: treesize reduction 5, result has 58.3 percent of original size [2021-02-24 00:16:52,543 WARN L147 QuantifierPusher]: treesize reduction 5, result has 58.3 percent of original size 7 [2021-02-24 00:16:52,550 WARN L141 QuantifierPusher]: treesize reduction 5, result has 66.7 percent of original size [2021-02-24 00:16:52,551 WARN L147 QuantifierPusher]: treesize reduction 5, result has 66.7 percent of original size 10 [2021-02-24 00:16:52,564 WARN L141 QuantifierPusher]: treesize reduction 13, result has 71.1 percent of original size [2021-02-24 00:16:52,566 WARN L147 QuantifierPusher]: treesize reduction 13, result has 71.1 percent of original size 32 [2021-02-24 00:16:52,595 WARN L141 QuantifierPusher]: treesize reduction 16, result has 55.6 percent of original size [2021-02-24 00:16:52,597 WARN L147 QuantifierPusher]: treesize reduction 16, result has 55.6 percent of original size 20 [2021-02-24 00:16:52,615 WARN L141 QuantifierPusher]: treesize reduction 14, result has 60.0 percent of original size [2021-02-24 00:16:52,616 WARN L147 QuantifierPusher]: treesize reduction 14, result has 60.0 percent of original size 21 [2021-02-24 00:16:52,642 WARN L141 QuantifierPusher]: treesize reduction 15, result has 46.4 percent of original size [2021-02-24 00:16:52,643 WARN L147 QuantifierPusher]: treesize reduction 15, result has 46.4 percent of original size 13 [2021-02-24 00:16:52,663 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,665 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-24 00:16:52,681 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,683 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-24 00:16:52,699 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,701 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:52,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-24 00:16:52,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:52,739 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:52,739 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:52,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-24 00:16:52,744 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2046850507] [2021-02-24 00:16:52,744 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-02-24 00:16:52,744 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-02-24 00:16:52,744 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252751592] [2021-02-24 00:16:52,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-24 00:16:52,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-24 00:16:52,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-24 00:16:52,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-02-24 00:16:52,747 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 12 states. [2021-02-24 00:16:53,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-24 00:16:53,270 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-02-24 00:16:53,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-02-24 00:16:53,271 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 27 [2021-02-24 00:16:53,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-24 00:16:53,272 INFO L225 Difference]: With dead ends: 51 [2021-02-24 00:16:53,272 INFO L226 Difference]: Without dead ends: 36 [2021-02-24 00:16:53,274 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2021-02-24 00:16:53,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-02-24 00:16:53,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-02-24 00:16:53,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2021-02-24 00:16:53,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-02-24 00:16:53,285 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 27 [2021-02-24 00:16:53,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-24 00:16:53,285 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-02-24 00:16:53,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-02-24 00:16:53,286 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-02-24 00:16:53,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-02-24 00:16:53,287 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 00:16:53,287 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-24 00:16:53,287 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-24 00:16:53,287 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 00:16:53,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 00:16:53,288 INFO L82 PathProgramCache]: Analyzing trace with hash 92181401, now seen corresponding path program 2 times [2021-02-24 00:16:53,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 00:16:53,288 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33570795] [2021-02-24 00:16:53,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 00:16:53,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:53,349 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:53,350 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:53,350 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:53,351 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-24 00:16:53,354 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:53,355 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-24 00:16:53,363 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:53,364 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2021-02-24 00:16:53,373 WARN L141 QuantifierPusher]: treesize reduction 2, result has 83.3 percent of original size [2021-02-24 00:16:53,374 WARN L147 QuantifierPusher]: treesize reduction 2, result has 83.3 percent of original size 10 [2021-02-24 00:16:53,384 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:53,385 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-02-24 00:16:53,397 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:53,398 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-02-24 00:16:53,413 WARN L141 QuantifierPusher]: treesize reduction 14, result has 57.6 percent of original size [2021-02-24 00:16:53,415 WARN L147 QuantifierPusher]: treesize reduction 14, result has 57.6 percent of original size 19 [2021-02-24 00:16:53,436 WARN L141 QuantifierPusher]: treesize reduction 14, result has 57.6 percent of original size [2021-02-24 00:16:53,437 WARN L147 QuantifierPusher]: treesize reduction 14, result has 57.6 percent of original size 19 [2021-02-24 00:16:53,461 WARN L141 QuantifierPusher]: treesize reduction 14, result has 60.0 percent of original size [2021-02-24 00:16:53,462 WARN L147 QuantifierPusher]: treesize reduction 14, result has 60.0 percent of original size 21 [2021-02-24 00:16:53,487 WARN L141 QuantifierPusher]: treesize reduction 15, result has 46.4 percent of original size [2021-02-24 00:16:53,488 WARN L147 QuantifierPusher]: treesize reduction 15, result has 46.4 percent of original size 13 [2021-02-24 00:16:53,508 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:53,509 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-24 00:16:53,524 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:53,524 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-24 00:16:53,540 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:53,540 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:53,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-24 00:16:53,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:53,584 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:53,585 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:53,590 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-24 00:16:53,590 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33570795] [2021-02-24 00:16:53,590 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-02-24 00:16:53,590 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-02-24 00:16:53,591 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009479139] [2021-02-24 00:16:53,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-02-24 00:16:53,592 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-24 00:16:53,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-02-24 00:16:53,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2021-02-24 00:16:53,593 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 15 states. [2021-02-24 00:16:54,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-24 00:16:54,515 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-02-24 00:16:54,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-02-24 00:16:54,515 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 33 [2021-02-24 00:16:54,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-24 00:16:54,517 INFO L225 Difference]: With dead ends: 48 [2021-02-24 00:16:54,517 INFO L226 Difference]: Without dead ends: 43 [2021-02-24 00:16:54,518 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=149, Invalid=721, Unknown=0, NotChecked=0, Total=870 [2021-02-24 00:16:54,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-02-24 00:16:54,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2021-02-24 00:16:54,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2021-02-24 00:16:54,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-02-24 00:16:54,530 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 33 [2021-02-24 00:16:54,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-24 00:16:54,530 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-02-24 00:16:54,530 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-02-24 00:16:54,531 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-02-24 00:16:54,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-02-24 00:16:54,532 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 00:16:54,532 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-24 00:16:54,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-02-24 00:16:54,532 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 00:16:54,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 00:16:54,533 INFO L82 PathProgramCache]: Analyzing trace with hash -209521128, now seen corresponding path program 1 times [2021-02-24 00:16:54,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 00:16:54,534 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1963405796] [2021-02-24 00:16:54,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 00:16:54,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:54,561 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,562 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:54,562 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,563 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-24 00:16:54,566 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,567 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-02-24 00:16:54,571 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,571 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-24 00:16:54,576 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,577 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:54,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-24 00:16:54,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:54,603 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,604 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:54,606 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-24 00:16:54,607 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1963405796] [2021-02-24 00:16:54,607 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-02-24 00:16:54,607 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-02-24 00:16:54,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88320751] [2021-02-24 00:16:54,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-24 00:16:54,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-24 00:16:54,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-24 00:16:54,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-02-24 00:16:54,609 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 6 states. [2021-02-24 00:16:54,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-24 00:16:54,784 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2021-02-24 00:16:54,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-24 00:16:54,784 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2021-02-24 00:16:54,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-24 00:16:54,785 INFO L225 Difference]: With dead ends: 53 [2021-02-24 00:16:54,786 INFO L226 Difference]: Without dead ends: 41 [2021-02-24 00:16:54,786 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-02-24 00:16:54,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-02-24 00:16:54,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-02-24 00:16:54,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2021-02-24 00:16:54,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2021-02-24 00:16:54,797 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 34 [2021-02-24 00:16:54,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-24 00:16:54,798 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2021-02-24 00:16:54,798 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-24 00:16:54,798 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2021-02-24 00:16:54,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-02-24 00:16:54,799 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 00:16:54,799 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-24 00:16:54,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-02-24 00:16:54,800 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 00:16:54,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 00:16:54,800 INFO L82 PathProgramCache]: Analyzing trace with hash -1823217387, now seen corresponding path program 3 times [2021-02-24 00:16:54,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 00:16:54,801 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [973896732] [2021-02-24 00:16:54,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 00:16:54,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:54,858 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,858 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:54,859 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,860 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-24 00:16:54,863 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,864 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-24 00:16:54,871 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,872 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2021-02-24 00:16:54,881 WARN L141 QuantifierPusher]: treesize reduction 2, result has 83.3 percent of original size [2021-02-24 00:16:54,882 WARN L147 QuantifierPusher]: treesize reduction 2, result has 83.3 percent of original size 10 [2021-02-24 00:16:54,892 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,894 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-02-24 00:16:54,907 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,907 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-02-24 00:16:54,919 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,920 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-02-24 00:16:54,932 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,933 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-02-24 00:16:54,934 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:54,935 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-02-24 00:16:54,952 WARN L141 QuantifierPusher]: treesize reduction 14, result has 57.6 percent of original size [2021-02-24 00:16:54,953 WARN L147 QuantifierPusher]: treesize reduction 14, result has 57.6 percent of original size 19 [2021-02-24 00:16:54,973 WARN L141 QuantifierPusher]: treesize reduction 14, result has 57.6 percent of original size [2021-02-24 00:16:54,974 WARN L147 QuantifierPusher]: treesize reduction 14, result has 57.6 percent of original size 19 [2021-02-24 00:16:54,998 WARN L141 QuantifierPusher]: treesize reduction 14, result has 60.0 percent of original size [2021-02-24 00:16:54,999 WARN L147 QuantifierPusher]: treesize reduction 14, result has 60.0 percent of original size 21 [2021-02-24 00:16:55,022 WARN L141 QuantifierPusher]: treesize reduction 15, result has 46.4 percent of original size [2021-02-24 00:16:55,023 WARN L147 QuantifierPusher]: treesize reduction 15, result has 46.4 percent of original size 13 [2021-02-24 00:16:55,045 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:55,045 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-24 00:16:55,078 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:55,078 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-24 00:16:55,093 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:55,094 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:55,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-24 00:16:55,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:55,132 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:55,132 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:55,138 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-24 00:16:55,138 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [973896732] [2021-02-24 00:16:55,139 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-02-24 00:16:55,139 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-02-24 00:16:55,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808333552] [2021-02-24 00:16:55,140 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-02-24 00:16:55,140 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-24 00:16:55,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-02-24 00:16:55,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=232, Unknown=0, NotChecked=0, Total=272 [2021-02-24 00:16:55,141 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 17 states. [2021-02-24 00:16:56,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-24 00:16:56,187 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2021-02-24 00:16:56,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-02-24 00:16:56,188 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2021-02-24 00:16:56,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-24 00:16:56,189 INFO L225 Difference]: With dead ends: 53 [2021-02-24 00:16:56,190 INFO L226 Difference]: Without dead ends: 48 [2021-02-24 00:16:56,191 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=148, Invalid=782, Unknown=0, NotChecked=0, Total=930 [2021-02-24 00:16:56,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-02-24 00:16:56,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2021-02-24 00:16:56,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2021-02-24 00:16:56,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-02-24 00:16:56,203 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 39 [2021-02-24 00:16:56,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-24 00:16:56,203 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-02-24 00:16:56,203 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2021-02-24 00:16:56,203 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-02-24 00:16:56,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-02-24 00:16:56,204 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 00:16:56,205 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-24 00:16:56,205 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-02-24 00:16:56,205 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 00:16:56,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 00:16:56,206 INFO L82 PathProgramCache]: Analyzing trace with hash 542658588, now seen corresponding path program 2 times [2021-02-24 00:16:56,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 00:16:56,206 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170484718] [2021-02-24 00:16:56,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 00:16:56,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:56,236 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:56,237 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:56,238 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:56,238 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-24 00:16:56,241 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:56,242 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-02-24 00:16:56,246 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:56,246 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-24 00:16:56,251 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:56,252 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-24 00:16:56,257 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:56,258 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-24 00:16:56,265 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:56,265 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:56,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-24 00:16:56,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 00:16:56,290 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 00:16:56,291 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 00:16:56,294 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-24 00:16:56,294 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170484718] [2021-02-24 00:16:56,294 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-02-24 00:16:56,294 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-02-24 00:16:56,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193421676] [2021-02-24 00:16:56,295 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-24 00:16:56,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-24 00:16:56,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-24 00:16:56,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-02-24 00:16:56,296 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 8 states. [2021-02-24 00:16:56,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-24 00:16:56,558 INFO L93 Difference]: Finished difference Result 63 states and 67 transitions. [2021-02-24 00:16:56,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-24 00:16:56,558 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2021-02-24 00:16:56,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-24 00:16:56,559 INFO L225 Difference]: With dead ends: 63 [2021-02-24 00:16:56,559 INFO L226 Difference]: Without dead ends: 51 [2021-02-24 00:16:56,560 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2021-02-24 00:16:56,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-02-24 00:16:56,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2021-02-24 00:16:56,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2021-02-24 00:16:56,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-02-24 00:16:56,574 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 40 [2021-02-24 00:16:56,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-24 00:16:56,575 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-02-24 00:16:56,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-02-24 00:16:56,575 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-02-24 00:16:56,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-02-24 00:16:56,576 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 00:16:56,588 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-24 00:16:56,589 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-02-24 00:16:56,589 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 00:16:56,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 00:16:56,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1574639392, now seen corresponding path program 3 times [2021-02-24 00:16:56,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 00:16:56,590 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [919055653] [2021-02-24 00:16:56,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 00:16:56,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-24 00:16:56,607 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-24 00:16:56,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-24 00:16:56,634 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-24 00:16:56,677 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-24 00:16:56,678 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-24 00:16:56,678 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-02-24 00:16:56,752 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.02 12:16:56 BoogieIcfgContainer [2021-02-24 00:16:56,752 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-24 00:16:56,757 INFO L168 Benchmark]: Toolchain (without parser) took 6493.48 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 127.4 MB in the beginning and 194.4 MB in the end (delta: -67.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-24 00:16:56,758 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 151.0 MB. Free memory is still 130.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-24 00:16:56,758 INFO L168 Benchmark]: CACSL2BoogieTranslator took 328.69 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-24 00:16:56,759 INFO L168 Benchmark]: Boogie Preprocessor took 36.39 ms. Allocated memory is still 151.0 MB. Free memory was 116.9 MB in the beginning and 115.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-24 00:16:56,762 INFO L168 Benchmark]: RCFGBuilder took 410.06 ms. Allocated memory is still 151.0 MB. Free memory was 115.2 MB in the beginning and 101.4 MB in the end (delta: 13.9 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-02-24 00:16:56,763 INFO L168 Benchmark]: TraceAbstraction took 5692.86 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 100.8 MB in the beginning and 194.4 MB in the end (delta: -93.6 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-02-24 00:16:56,768 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 151.0 MB. Free memory is still 130.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 328.69 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 36.39 ms. Allocated memory is still 151.0 MB. Free memory was 116.9 MB in the beginning and 115.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 410.06 ms. Allocated memory is still 151.0 MB. Free memory was 115.2 MB in the beginning and 101.4 MB in the end (delta: 13.9 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5692.86 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 100.8 MB in the beginning and 194.4 MB in the end (delta: -93.6 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L23] int i, n=__VERIFIER_nondet_uint(), sn=0; VAL [__VERIFIER_nondet_uint()=4, n=4] [L23] int i, n=__VERIFIER_nondet_uint(), sn=0; VAL [n=0, n=4] [L24] i=1 VAL [i=1, n=0, n=4] [L24] COND TRUE i<=n VAL [i=1, n=4, n=0] [L25] sn = sn + (2) VAL [i=1, n=4, n=2] [L26] COND FALSE !(i==4) VAL [i=1, n=4, n=2] [L24] i++ VAL [i=2, n=4, n=2] [L24] COND TRUE i<=n VAL [i=2, n=2, n=4] [L25] sn = sn + (2) VAL [i=2, n=4, n=4] [L26] COND FALSE !(i==4) VAL [i=2, n=4, n=4] [L24] i++ VAL [i=3, n=4, n=4] [L24] COND TRUE i<=n VAL [i=3, n=4, n=4] [L25] sn = sn + (2) VAL [i=3, n=6, n=4] [L26] COND FALSE !(i==4) VAL [i=3, n=4, n=6] [L24] i++ VAL [i=4, n=4, n=6] [L24] COND TRUE i<=n VAL [i=4, n=6, n=4] [L25] sn = sn + (2) VAL [i=4, n=4, n=8] [L26] COND TRUE i==4 VAL [i=4, n=4, n=8] [L26] sn=-10 VAL [i=4, n=4, n=-10] [L24] i++ VAL [i=5, n=4, n=-10] [L24] COND FALSE !(i<=n) VAL [i=5, n=4, n=-10] [L28] CALL __VERIFIER_assert(sn==n*(2) || sn == 0) VAL [\old(cond)=0] [L15] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L16] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 40 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.5s, OverallIterations: 8, TraceHistogramMax: 4, AutomataDifference: 3.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 173 SDtfs, 234 SDslu, 438 SDs, 0 SdLazy, 728 SolverSat, 63 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 128 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 2.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 7 MinimizatonAttempts, 11 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 261 NumberOfCodeBlocks, 261 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 208 ConstructedInterpolants, 0 QuantifiedInterpolants, 33936 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 2 PerfectInterpolantSequences, 16/59 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...