/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/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-07 06:36:04,939 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-07 06:36:04,942 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-07 06:36:04,991 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-07 06:36:04,992 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-07 06:36:04,993 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-07 06:36:04,995 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-07 06:36:04,998 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-07 06:36:05,000 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-07 06:36:05,002 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-07 06:36:05,003 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-07 06:36:05,005 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-07 06:36:05,006 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-07 06:36:05,007 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-07 06:36:05,009 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-07 06:36:05,010 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-07 06:36:05,012 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-07 06:36:05,013 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-07 06:36:05,015 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-07 06:36:05,017 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-07 06:36:05,019 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-07 06:36:05,025 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-07 06:36:05,026 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-07 06:36:05,028 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-07 06:36:05,031 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-07 06:36:05,043 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-07 06:36:05,044 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-07 06:36:05,045 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-07 06:36:05,060 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-11-07 06:36:05,082 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-07 06:36:05,088 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-07 06:36:05,090 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-07 06:36:05,090 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-07 06:36:05,090 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-07 06:36:05,091 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-07 06:36:05,093 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-07 06:36:05,093 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-07 06:36:05,094 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-07 06:36:05,094 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-07 06:36:05,094 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-07 06:36:05,094 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-07 06:36:05,095 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-07 06:36:05,095 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-07 06:36:05,097 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-07 06:36:05,097 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-11-07 06:36:05,098 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-07 06:36:05,098 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-07 06:36:05,098 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 06:36:05,099 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-07 06:36:05,099 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-11-07 06:36:05,099 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-07 06:36:05,099 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-11-07 06:36:05,543 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-07 06:36:05,582 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-07 06:36:05,585 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-07 06:36:05,587 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-07 06:36:05,588 INFO L275 PluginConnector]: CDTParser initialized [2020-11-07 06:36:05,588 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-11-07 06:36:05,672 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92932af2a/e6cebab2c18447dcac3ab98395e5154c/FLAG7e5bce62c [2020-11-07 06:36:06,313 INFO L306 CDTParser]: Found 1 translation units. [2020-11-07 06:36:06,313 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-11-07 06:36:06,321 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92932af2a/e6cebab2c18447dcac3ab98395e5154c/FLAG7e5bce62c [2020-11-07 06:36:06,691 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92932af2a/e6cebab2c18447dcac3ab98395e5154c [2020-11-07 06:36:06,694 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-07 06:36:06,704 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-07 06:36:06,707 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-07 06:36:06,708 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-07 06:36:06,712 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-07 06:36:06,713 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:06,717 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e5ceff3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06, skipping insertion in model container [2020-11-07 06:36:06,717 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:06,727 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-07 06:36:06,743 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-07 06:36:06,935 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 06:36:06,947 INFO L203 MainTranslator]: Completed pre-run [2020-11-07 06:36:06,965 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 06:36:06,983 INFO L208 MainTranslator]: Completed translation [2020-11-07 06:36:06,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06 WrapperNode [2020-11-07 06:36:06,984 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-07 06:36:06,985 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-07 06:36:06,985 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-07 06:36:06,986 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-07 06:36:07,000 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:07,000 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:07,009 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:07,009 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:07,015 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:07,020 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:07,022 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:07,024 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-07 06:36:07,025 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-07 06:36:07,025 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-07 06:36:07,025 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-07 06:36:07,026 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06" (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 [2020-11-07 06:36:07,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-07 06:36:07,162 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-07 06:36:07,162 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-07 06:36:07,162 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-11-07 06:36:07,162 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-07 06:36:07,163 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-07 06:36:07,163 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-07 06:36:07,163 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-07 06:36:07,163 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-07 06:36:07,163 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-11-07 06:36:07,164 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-07 06:36:07,164 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-07 06:36:07,164 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-07 06:36:07,164 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-07 06:36:07,164 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-07 06:36:07,165 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-07 06:36:07,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-07 06:36:07,476 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-07 06:36:07,476 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-11-07 06:36:07,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 06:36:07 BoogieIcfgContainer [2020-11-07 06:36:07,479 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-07 06:36:07,481 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-07 06:36:07,481 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-07 06:36:07,485 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-07 06:36:07,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 06:36:06" (1/3) ... [2020-11-07 06:36:07,486 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63b87c03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 06:36:07, skipping insertion in model container [2020-11-07 06:36:07,486 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06" (2/3) ... [2020-11-07 06:36:07,487 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63b87c03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 06:36:07, skipping insertion in model container [2020-11-07 06:36:07,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 06:36:07" (3/3) ... [2020-11-07 06:36:07,489 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-11-07 06:36:07,507 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-11-07 06:36:07,511 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-07 06:36:07,526 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-07 06:36:07,581 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-07 06:36:07,581 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-07 06:36:07,584 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-11-07 06:36:07,584 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-07 06:36:07,584 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-07 06:36:07,584 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-07 06:36:07,585 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-07 06:36:07,585 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-07 06:36:07,616 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states. [2020-11-07 06:36:07,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-07 06:36:07,629 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:07,631 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] [2020-11-07 06:36:07,631 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:07,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:07,643 INFO L82 PathProgramCache]: Analyzing trace with hash -772490682, now seen corresponding path program 1 times [2020-11-07 06:36:07,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:07,655 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164389824] [2020-11-07 06:36:07,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:07,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:08,166 WARN L194 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-11-07 06:36:08,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:08,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:08,220 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:08,224 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1164389824] [2020-11-07 06:36:08,226 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:36:08,227 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-07 06:36:08,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230297525] [2020-11-07 06:36:08,235 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-07 06:36:08,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:08,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-07 06:36:08,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-07 06:36:08,260 INFO L87 Difference]: Start difference. First operand 34 states. Second operand 4 states. [2020-11-07 06:36:08,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:08,513 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2020-11-07 06:36:08,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-07 06:36:08,515 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-11-07 06:36:08,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:08,524 INFO L225 Difference]: With dead ends: 49 [2020-11-07 06:36:08,525 INFO L226 Difference]: Without dead ends: 28 [2020-11-07 06:36:08,528 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-07 06:36:08,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-11-07 06:36:08,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-11-07 06:36:08,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-07 06:36:08,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-11-07 06:36:08,580 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 20 [2020-11-07 06:36:08,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:08,581 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-11-07 06:36:08,581 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-07 06:36:08,581 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-11-07 06:36:08,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-07 06:36:08,583 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:08,583 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] [2020-11-07 06:36:08,583 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-07 06:36:08,584 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:08,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:08,585 INFO L82 PathProgramCache]: Analyzing trace with hash 515607529, now seen corresponding path program 1 times [2020-11-07 06:36:08,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:08,585 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474109085] [2020-11-07 06:36:08,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:08,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:08,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:08,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:08,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:08,836 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474109085] [2020-11-07 06:36:08,836 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:08,837 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-11-07 06:36:08,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148582398] [2020-11-07 06:36:08,839 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-07 06:36:08,839 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:08,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-07 06:36:08,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-11-07 06:36:08,840 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 6 states. [2020-11-07 06:36:09,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:09,218 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-11-07 06:36:09,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-07 06:36:09,219 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-11-07 06:36:09,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:09,220 INFO L225 Difference]: With dead ends: 39 [2020-11-07 06:36:09,220 INFO L226 Difference]: Without dead ends: 33 [2020-11-07 06:36:09,222 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2020-11-07 06:36:09,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-11-07 06:36:09,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-11-07 06:36:09,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-11-07 06:36:09,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-11-07 06:36:09,235 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 25 [2020-11-07 06:36:09,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:09,235 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-11-07 06:36:09,235 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-07 06:36:09,236 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-11-07 06:36:09,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-11-07 06:36:09,237 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:09,237 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] [2020-11-07 06:36:09,237 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-07 06:36:09,238 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:09,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:09,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1732949978, now seen corresponding path program 2 times [2020-11-07 06:36:09,239 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:09,239 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762206673] [2020-11-07 06:36:09,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:09,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:09,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:09,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:09,510 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:09,510 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762206673] [2020-11-07 06:36:09,511 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:09,511 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-11-07 06:36:09,511 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302211476] [2020-11-07 06:36:09,512 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-07 06:36:09,512 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:09,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-07 06:36:09,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-11-07 06:36:09,514 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 8 states. [2020-11-07 06:36:10,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:10,233 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-11-07 06:36:10,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-07 06:36:10,233 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 30 [2020-11-07 06:36:10,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:10,235 INFO L225 Difference]: With dead ends: 44 [2020-11-07 06:36:10,235 INFO L226 Difference]: Without dead ends: 38 [2020-11-07 06:36:10,236 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2020-11-07 06:36:10,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-07 06:36:10,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-11-07 06:36:10,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-11-07 06:36:10,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-11-07 06:36:10,250 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 30 [2020-11-07 06:36:10,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:10,251 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-11-07 06:36:10,251 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-07 06:36:10,251 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-11-07 06:36:10,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-11-07 06:36:10,253 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:10,253 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-11-07 06:36:10,253 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-07 06:36:10,253 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:10,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:10,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1450661367, now seen corresponding path program 3 times [2020-11-07 06:36:10,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:10,255 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914940613] [2020-11-07 06:36:10,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:10,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:10,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:10,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:10,503 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:10,504 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914940613] [2020-11-07 06:36:10,504 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:10,504 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-11-07 06:36:10,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291741060] [2020-11-07 06:36:10,505 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-07 06:36:10,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:10,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-07 06:36:10,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2020-11-07 06:36:10,506 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 10 states. [2020-11-07 06:36:11,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:11,182 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-11-07 06:36:11,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-07 06:36:11,185 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 35 [2020-11-07 06:36:11,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:11,186 INFO L225 Difference]: With dead ends: 49 [2020-11-07 06:36:11,186 INFO L226 Difference]: Without dead ends: 43 [2020-11-07 06:36:11,188 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2020-11-07 06:36:11,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-11-07 06:36:11,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-11-07 06:36:11,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-11-07 06:36:11,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-11-07 06:36:11,203 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 35 [2020-11-07 06:36:11,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:11,204 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-11-07 06:36:11,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-07 06:36:11,204 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-11-07 06:36:11,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-11-07 06:36:11,205 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:11,205 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:11,206 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-07 06:36:11,206 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:11,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:11,207 INFO L82 PathProgramCache]: Analyzing trace with hash 772144646, now seen corresponding path program 4 times [2020-11-07 06:36:11,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:11,207 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688850797] [2020-11-07 06:36:11,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:11,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:11,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:11,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:11,453 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:11,454 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688850797] [2020-11-07 06:36:11,454 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:11,454 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-11-07 06:36:11,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872597099] [2020-11-07 06:36:11,455 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-07 06:36:11,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:11,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-07 06:36:11,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2020-11-07 06:36:11,456 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 12 states. [2020-11-07 06:36:12,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:12,382 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-11-07 06:36:12,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-07 06:36:12,383 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-11-07 06:36:12,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:12,385 INFO L225 Difference]: With dead ends: 54 [2020-11-07 06:36:12,386 INFO L226 Difference]: Without dead ends: 48 [2020-11-07 06:36:12,387 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=116, Invalid=484, Unknown=0, NotChecked=0, Total=600 [2020-11-07 06:36:12,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-11-07 06:36:12,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-11-07 06:36:12,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-11-07 06:36:12,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-11-07 06:36:12,402 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 40 [2020-11-07 06:36:12,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:12,403 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-11-07 06:36:12,403 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-07 06:36:12,403 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-11-07 06:36:12,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-11-07 06:36:12,405 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:12,405 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:12,406 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-07 06:36:12,406 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:12,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:12,407 INFO L82 PathProgramCache]: Analyzing trace with hash 1100914729, now seen corresponding path program 5 times [2020-11-07 06:36:12,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:12,407 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636533819] [2020-11-07 06:36:12,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:12,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:12,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:12,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:12,686 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:12,687 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636533819] [2020-11-07 06:36:12,687 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:12,687 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-11-07 06:36:12,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201006924] [2020-11-07 06:36:12,688 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-07 06:36:12,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:12,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-07 06:36:12,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2020-11-07 06:36:12,690 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 14 states. [2020-11-07 06:36:13,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:13,766 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-11-07 06:36:13,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-11-07 06:36:13,770 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 45 [2020-11-07 06:36:13,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:13,771 INFO L225 Difference]: With dead ends: 59 [2020-11-07 06:36:13,771 INFO L226 Difference]: Without dead ends: 53 [2020-11-07 06:36:13,775 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2020-11-07 06:36:13,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-11-07 06:36:13,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2020-11-07 06:36:13,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-11-07 06:36:13,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-11-07 06:36:13,808 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 45 [2020-11-07 06:36:13,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:13,808 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-11-07 06:36:13,808 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-07 06:36:13,809 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-11-07 06:36:13,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-11-07 06:36:13,813 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:13,813 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:13,814 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-07 06:36:13,818 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:13,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:13,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1507122150, now seen corresponding path program 6 times [2020-11-07 06:36:13,819 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:13,820 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431449763] [2020-11-07 06:36:13,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:13,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 06:36:13,869 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 06:36:13,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 06:36:13,916 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 06:36:13,960 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-11-07 06:36:13,960 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-07 06:36:13,961 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-07 06:36:14,049 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 06:36:14 BoogieIcfgContainer [2020-11-07 06:36:14,050 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-07 06:36:14,052 INFO L168 Benchmark]: Toolchain (without parser) took 7355.18 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 109.0 MB in the beginning and 141.6 MB in the end (delta: -32.5 MB). Peak memory consumption was 35.3 MB. Max. memory is 8.0 GB. [2020-11-07 06:36:14,053 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 151.0 MB. Free memory is still 126.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-07 06:36:14,054 INFO L168 Benchmark]: CACSL2BoogieTranslator took 276.99 ms. Allocated memory is still 151.0 MB. Free memory was 108.3 MB in the beginning and 98.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-11-07 06:36:14,055 INFO L168 Benchmark]: Boogie Preprocessor took 38.59 ms. Allocated memory is still 151.0 MB. Free memory was 98.9 MB in the beginning and 97.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-11-07 06:36:14,056 INFO L168 Benchmark]: RCFGBuilder took 454.20 ms. Allocated memory is still 151.0 MB. Free memory was 97.3 MB in the beginning and 123.6 MB in the end (delta: -26.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. [2020-11-07 06:36:14,057 INFO L168 Benchmark]: TraceAbstraction took 6569.36 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 123.0 MB in the beginning and 141.6 MB in the end (delta: -18.6 MB). Peak memory consumption was 49.2 MB. Max. memory is 8.0 GB. [2020-11-07 06:36:14,061 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 151.0 MB. Free memory is still 126.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 276.99 ms. Allocated memory is still 151.0 MB. Free memory was 108.3 MB in the beginning and 98.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 38.59 ms. Allocated memory is still 151.0 MB. Free memory was 98.9 MB in the beginning and 97.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 454.20 ms. Allocated memory is still 151.0 MB. Free memory was 97.3 MB in the beginning and 123.6 MB in the end (delta: -26.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6569.36 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 123.0 MB in the beginning and 141.6 MB in the end (delta: -18.6 MB). Peak memory consumption was 49.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] unsigned int x = 0; VAL [x=0] [L14] unsigned int y = 1; VAL [x=0, y=1] [L16] COND TRUE x < 6 VAL [x=0, y=1] [L17] x++ VAL [x=1, y=1] [L18] y *= 2 VAL [x=1, y=2] [L16] COND TRUE x < 6 VAL [x=1, y=2] [L17] x++ VAL [x=2, y=2] [L18] y *= 2 VAL [x=2, y=4] [L16] COND TRUE x < 6 VAL [x=2, y=4] [L17] x++ VAL [x=3, y=4] [L18] y *= 2 VAL [x=3, y=8] [L16] COND TRUE x < 6 VAL [x=3, y=8] [L17] x++ VAL [x=4, y=8] [L18] y *= 2 VAL [x=4, y=16] [L16] COND TRUE x < 6 VAL [x=4, y=16] [L17] x++ VAL [x=5, y=16] [L18] y *= 2 VAL [x=5, y=32] [L16] COND TRUE x < 6 VAL [x=5, y=32] [L17] x++ VAL [x=6, y=32] [L18] y *= 2 VAL [x=6, y=64] [L16] COND FALSE !(x < 6) VAL [x=6, y=64] [L21] CALL __VERIFIER_assert(y != 64) VAL [\old(cond)=0] [L6] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L7] CALL reach_error() [L3] __assert_fail("0", "underapprox_1-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.3s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 4.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 198 SDslu, 469 SDs, 0 SdLazy, 740 SolverSat, 63 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 111 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 3.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=6, 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, 6 MinimizatonAttempts, 12 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 245 NumberOfCodeBlocks, 245 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 189 ConstructedInterpolants, 0 QuantifiedInterpolants, 30297 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 1 PerfectInterpolantSequences, 0/115 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...