/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/phases_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 21:47:18,700 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 21:47:18,705 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 21:47:18,767 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 21:47:18,781 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 21:47:18,782 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 21:47:18,784 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 21:47:18,786 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 21:47:18,787 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 21:47:18,788 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 21:47:18,790 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 21:47:18,793 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 21:47:18,795 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 21:47:18,797 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 21:47:18,799 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 21:47:18,801 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 21:47:18,804 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 21:47:18,816 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 21:47:18,832 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 21:47:18,833 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 21:47:18,835 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 21:47:18,848 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 21:47:18,849 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 21:47:18,850 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 21:47:18,851 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 21:47:18,851 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 21:47:18,851 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 21:47:18,851 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 21:47:18,852 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 21:47:18,852 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 21:47:18,852 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 21:47:18,852 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 21:47:18,852 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 21:47:18,853 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 21:47:18,853 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 21:47:18,853 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 21:47:18,853 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 21:47:18,854 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 21:47:18,854 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 21:47:18,854 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 21:47:18,854 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 21:47:18,854 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 21:47:18,855 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 21:47:18,855 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 21:47:19,255 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 21:47:19,290 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 21:47:19,294 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 21:47:19,296 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 21:47:19,297 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 21:47:19,298 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_2-2.c [2020-10-23 21:47:19,387 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf5aa6301/ccab7ddce69749bdad7cfcdb100b751f/FLAG57e5d423d [2020-10-23 21:47:20,137 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 21:47:20,138 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_2-2.c [2020-10-23 21:47:20,146 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf5aa6301/ccab7ddce69749bdad7cfcdb100b751f/FLAG57e5d423d [2020-10-23 21:47:20,503 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf5aa6301/ccab7ddce69749bdad7cfcdb100b751f [2020-10-23 21:47:20,506 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 21:47:20,514 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 21:47:20,517 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 21:47:20,518 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 21:47:20,523 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 21:47:20,524 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:47:20" (1/1) ... [2020-10-23 21:47:20,528 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66f35e36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20, skipping insertion in model container [2020-10-23 21:47:20,528 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:47:20" (1/1) ... [2020-10-23 21:47:20,538 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 21:47:20,557 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 21:47:20,740 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:47:20,753 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 21:47:20,773 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 21:47:20,792 INFO L208 MainTranslator]: Completed translation [2020-10-23 21:47:20,793 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20 WrapperNode [2020-10-23 21:47:20,793 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 21:47:20,795 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 21:47:20,795 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 21:47:20,795 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 21:47:20,810 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20" (1/1) ... [2020-10-23 21:47:20,811 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20" (1/1) ... [2020-10-23 21:47:20,819 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20" (1/1) ... [2020-10-23 21:47:20,820 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20" (1/1) ... [2020-10-23 21:47:20,826 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20" (1/1) ... [2020-10-23 21:47:20,831 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20" (1/1) ... [2020-10-23 21:47:20,833 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20" (1/1) ... [2020-10-23 21:47:20,835 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 21:47:20,837 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 21:47:20,837 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 21:47:20,837 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 21:47:20,838 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20" (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 [2020-10-23 21:47:20,934 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 21:47:20,934 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 21:47:20,935 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 21:47:20,936 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-23 21:47:20,936 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 21:47:20,936 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 21:47:20,936 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 21:47:20,937 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 21:47:20,937 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 21:47:20,937 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 21:47:20,938 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-23 21:47:20,938 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-10-23 21:47:20,938 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 21:47:20,938 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 21:47:20,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 21:47:20,939 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 21:47:20,939 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 21:47:20,939 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 21:47:20,940 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 21:47:20,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 21:47:21,468 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 21:47:21,469 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 21:47:21,476 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:47:21 BoogieIcfgContainer [2020-10-23 21:47:21,477 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 21:47:21,481 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 21:47:21,481 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 21:47:21,485 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 21:47:21,486 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 09:47:20" (1/3) ... [2020-10-23 21:47:21,488 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50d3cdd4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:47:21, skipping insertion in model container [2020-10-23 21:47:21,488 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:20" (2/3) ... [2020-10-23 21:47:21,489 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50d3cdd4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:47:21, skipping insertion in model container [2020-10-23 21:47:21,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:47:21" (3/3) ... [2020-10-23 21:47:21,492 INFO L111 eAbstractionObserver]: Analyzing ICFG phases_2-2.c [2020-10-23 21:47:21,508 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 21:47:21,515 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 21:47:21,532 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 21:47:21,573 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 21:47:21,573 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 21:47:21,573 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 21:47:21,573 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 21:47:21,574 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 21:47:21,574 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 21:47:21,574 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 21:47:21,574 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 21:47:21,600 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-10-23 21:47:21,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-23 21:47:21,615 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:21,618 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] [2020-10-23 21:47:21,619 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:21,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:21,630 INFO L82 PathProgramCache]: Analyzing trace with hash 153821576, now seen corresponding path program 1 times [2020-10-23 21:47:21,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:21,651 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56136278] [2020-10-23 21:47:21,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:21,766 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:21,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:22,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:22,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:22,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:22,151 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56136278] [2020-10-23 21:47:22,154 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:22,154 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-23 21:47:22,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190555182] [2020-10-23 21:47:22,161 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-23 21:47:22,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:22,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-23 21:47:22,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 21:47:22,183 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 3 states. [2020-10-23 21:47:22,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:22,299 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2020-10-23 21:47:22,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-23 21:47:22,302 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-10-23 21:47:22,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:22,312 INFO L225 Difference]: With dead ends: 50 [2020-10-23 21:47:22,313 INFO L226 Difference]: Without dead ends: 28 [2020-10-23 21:47:22,317 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 [2020-10-23 21:47:22,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-23 21:47:22,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-10-23 21:47:22,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-10-23 21:47:22,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-10-23 21:47:22,377 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 22 [2020-10-23 21:47:22,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:22,378 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-10-23 21:47:22,378 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-23 21:47:22,378 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-10-23 21:47:22,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-23 21:47:22,379 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:22,380 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] [2020-10-23 21:47:22,380 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 21:47:22,381 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:22,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:22,382 INFO L82 PathProgramCache]: Analyzing trace with hash -246986538, now seen corresponding path program 1 times [2020-10-23 21:47:22,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:22,383 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941376505] [2020-10-23 21:47:22,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 21:47:22,387 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 21:47:22,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:22,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 21:47:22,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 21:47:22,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 21:47:22,775 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941376505] [2020-10-23 21:47:22,776 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 21:47:22,776 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-23 21:47:22,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106305710] [2020-10-23 21:47:22,777 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-23 21:47:22,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 21:47:22,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-23 21:47:22,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-10-23 21:47:22,785 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 8 states. [2020-10-23 21:47:23,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 21:47:23,222 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-10-23 21:47:23,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 21:47:23,223 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-10-23 21:47:23,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 21:47:23,224 INFO L225 Difference]: With dead ends: 39 [2020-10-23 21:47:23,224 INFO L226 Difference]: Without dead ends: 33 [2020-10-23 21:47:23,226 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-10-23 21:47:23,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-10-23 21:47:23,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-10-23 21:47:23,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-23 21:47:23,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2020-10-23 21:47:23,239 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 22 [2020-10-23 21:47:23,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 21:47:23,239 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2020-10-23 21:47:23,239 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-23 21:47:23,239 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2020-10-23 21:47:23,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-23 21:47:23,241 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 21:47:23,241 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] [2020-10-23 21:47:23,241 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 21:47:23,241 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 21:47:23,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 21:47:23,242 INFO L82 PathProgramCache]: Analyzing trace with hash -93018322, now seen corresponding path program 1 times [2020-10-23 21:47:23,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 21:47:23,243 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162162188] [2020-10-23 21:47:23,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY