/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/recursive-simple/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-07 00:41:33,536 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-07 00:41:33,540 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-07 00:41:33,602 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-11-07 00:41:33,693 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 00:41:33,713 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-07 00:41:33,713 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-07 00:41:33,718 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-07 00:41:33,719 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-07 00:41:33,719 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-07 00:41:33,719 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-07 00:41:33,719 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-07 00:41:33,719 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-07 00:41:33,720 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-07 00:41:33,720 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-07 00:41:33,721 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-07 00:41:33,721 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-07 00:41:33,722 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-07 00:41:33,722 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-07 00:41:33,722 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-07 00:41:33,722 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-11-07 00:41:33,723 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-07 00:41:33,723 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-07 00:41:33,723 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 00:41:33,723 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-07 00:41:33,723 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-11-07 00:41:33,724 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-07 00:41:33,724 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-07 00:41:34,132 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-07 00:41:34,190 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-07 00:41:34,193 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-07 00:41:34,194 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-07 00:41:34,195 INFO L275 PluginConnector]: CDTParser initialized [2020-11-07 00:41:34,196 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-11-07 00:41:34,296 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc7305a5a/8d16f45c98074ba8ab5b265533546d17/FLAGe96897522 [2020-11-07 00:41:34,997 INFO L306 CDTParser]: Found 1 translation units. [2020-11-07 00:41:34,997 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-11-07 00:41:35,005 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc7305a5a/8d16f45c98074ba8ab5b265533546d17/FLAGe96897522 [2020-11-07 00:41:35,370 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc7305a5a/8d16f45c98074ba8ab5b265533546d17 [2020-11-07 00:41:35,373 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-07 00:41:35,383 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-07 00:41:35,388 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-07 00:41:35,388 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-07 00:41:35,392 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-07 00:41:35,393 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:41:35" (1/1) ... [2020-11-07 00:41:35,398 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@432dc9ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35, skipping insertion in model container [2020-11-07 00:41:35,398 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:41:35" (1/1) ... [2020-11-07 00:41:35,408 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-07 00:41:35,424 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-07 00:41:35,590 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 00:41:35,603 INFO L203 MainTranslator]: Completed pre-run [2020-11-07 00:41:35,623 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 00:41:35,642 INFO L208 MainTranslator]: Completed translation [2020-11-07 00:41:35,643 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35 WrapperNode [2020-11-07 00:41:35,643 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-07 00:41:35,645 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-07 00:41:35,645 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-07 00:41:35,645 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-07 00:41:35,660 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35" (1/1) ... [2020-11-07 00:41:35,661 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35" (1/1) ... [2020-11-07 00:41:35,669 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35" (1/1) ... [2020-11-07 00:41:35,670 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35" (1/1) ... [2020-11-07 00:41:35,676 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35" (1/1) ... [2020-11-07 00:41:35,677 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35" (1/1) ... [2020-11-07 00:41:35,679 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35" (1/1) ... [2020-11-07 00:41:35,681 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-07 00:41:35,682 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-07 00:41:35,682 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-07 00:41:35,682 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-07 00:41:35,683 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35" (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 00:41:35,780 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-07 00:41:35,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-07 00:41:35,781 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-07 00:41:35,781 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-11-07 00:41:35,782 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-11-07 00:41:35,782 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-07 00:41:35,782 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-07 00:41:35,782 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-07 00:41:35,783 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-07 00:41:35,783 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-07 00:41:35,783 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-07 00:41:35,783 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-11-07 00:41:35,784 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-11-07 00:41:35,784 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-07 00:41:35,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-07 00:41:35,785 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-07 00:41:35,785 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-07 00:41:35,785 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-07 00:41:35,785 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-07 00:41:35,786 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-07 00:41:36,120 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-07 00:41:36,121 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-07 00:41:36,123 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:41:36 BoogieIcfgContainer [2020-11-07 00:41:36,123 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-07 00:41:36,125 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-07 00:41:36,125 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-07 00:41:36,129 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-07 00:41:36,130 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:41:35" (1/3) ... [2020-11-07 00:41:36,131 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e92ef01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:41:36, skipping insertion in model container [2020-11-07 00:41:36,131 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:41:35" (2/3) ... [2020-11-07 00:41:36,132 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e92ef01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:41:36, skipping insertion in model container [2020-11-07 00:41:36,132 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:41:36" (3/3) ... [2020-11-07 00:41:36,134 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-11-07 00:41:36,167 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-11-07 00:41:36,170 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-07 00:41:36,184 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-07 00:41:36,211 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-07 00:41:36,211 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-07 00:41:36,211 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-11-07 00:41:36,211 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-07 00:41:36,212 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-07 00:41:36,212 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-07 00:41:36,212 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-07 00:41:36,212 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-07 00:41:36,230 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states. [2020-11-07 00:41:36,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-07 00:41:36,242 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 00:41:36,243 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 00:41:36,244 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 00:41:36,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 00:41:36,252 INFO L82 PathProgramCache]: Analyzing trace with hash -407315157, now seen corresponding path program 1 times [2020-11-07 00:41:36,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 00:41:36,263 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393635199] [2020-11-07 00:41:36,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 00:41:36,361 INFO L328 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-11-07 00:41:36,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:36,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 00:41:36,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:36,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-11-07 00:41:36,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:36,754 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 00:41:36,756 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393635199] [2020-11-07 00:41:36,759 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 00:41:36,760 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-07 00:41:36,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691537438] [2020-11-07 00:41:36,767 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-07 00:41:36,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 00:41:36,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-07 00:41:36,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-07 00:41:36,790 INFO L87 Difference]: Start difference. First operand 46 states. Second operand 6 states. [2020-11-07 00:41:37,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 00:41:37,387 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2020-11-07 00:41:37,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-07 00:41:37,389 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-11-07 00:41:37,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 00:41:37,401 INFO L225 Difference]: With dead ends: 61 [2020-11-07 00:41:37,401 INFO L226 Difference]: Without dead ends: 41 [2020-11-07 00:41:37,405 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-11-07 00:41:37,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-11-07 00:41:37,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-11-07 00:41:37,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-11-07 00:41:37,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-11-07 00:41:37,484 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 25 [2020-11-07 00:41:37,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 00:41:37,484 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-11-07 00:41:37,484 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-07 00:41:37,485 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-11-07 00:41:37,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-11-07 00:41:37,487 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 00:41:37,488 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, 1, 1, 1, 1, 1, 1] [2020-11-07 00:41:37,488 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-07 00:41:37,488 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 00:41:37,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 00:41:37,490 INFO L82 PathProgramCache]: Analyzing trace with hash -795183819, now seen corresponding path program 1 times [2020-11-07 00:41:37,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 00:41:37,490 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489059770] [2020-11-07 00:41:37,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 00:41:37,494 INFO L328 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-11-07 00:41:37,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:37,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 00:41:37,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:37,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-11-07 00:41:37,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:37,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 00:41:37,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:37,712 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 00:41:37,713 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489059770] [2020-11-07 00:41:37,713 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 00:41:37,713 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-11-07 00:41:37,714 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654733444] [2020-11-07 00:41:37,715 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-07 00:41:37,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 00:41:37,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-07 00:41:37,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-11-07 00:41:37,716 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2020-11-07 00:41:38,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 00:41:38,094 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2020-11-07 00:41:38,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-07 00:41:38,095 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 33 [2020-11-07 00:41:38,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 00:41:38,097 INFO L225 Difference]: With dead ends: 55 [2020-11-07 00:41:38,097 INFO L226 Difference]: Without dead ends: 48 [2020-11-07 00:41:38,099 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-11-07 00:41:38,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-11-07 00:41:38,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-11-07 00:41:38,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-11-07 00:41:38,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-11-07 00:41:38,119 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 33 [2020-11-07 00:41:38,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 00:41:38,119 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-11-07 00:41:38,119 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-07 00:41:38,120 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-11-07 00:41:38,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-11-07 00:41:38,122 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 00:41:38,122 INFO L422 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 00:41:38,122 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-07 00:41:38,122 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 00:41:38,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 00:41:38,123 INFO L82 PathProgramCache]: Analyzing trace with hash 870121323, now seen corresponding path program 1 times [2020-11-07 00:41:38,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 00:41:38,124 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1760938146] [2020-11-07 00:41:38,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 00:41:38,128 INFO L328 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-11-07 00:41:38,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:38,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 00:41:38,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:38,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-11-07 00:41:38,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:38,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 00:41:38,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:38,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 00:41:38,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:38,366 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-07 00:41:38,367 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1760938146] [2020-11-07 00:41:38,368 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 00:41:38,368 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-11-07 00:41:38,369 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163741132] [2020-11-07 00:41:38,372 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-07 00:41:38,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 00:41:38,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-07 00:41:38,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-11-07 00:41:38,375 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 9 states. [2020-11-07 00:41:38,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 00:41:38,841 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2020-11-07 00:41:38,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-07 00:41:38,842 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 41 [2020-11-07 00:41:38,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 00:41:38,844 INFO L225 Difference]: With dead ends: 65 [2020-11-07 00:41:38,844 INFO L226 Difference]: Without dead ends: 58 [2020-11-07 00:41:38,845 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-11-07 00:41:38,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-11-07 00:41:38,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 51. [2020-11-07 00:41:38,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-11-07 00:41:38,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2020-11-07 00:41:38,861 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 41 [2020-11-07 00:41:38,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 00:41:38,862 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2020-11-07 00:41:38,862 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-07 00:41:38,862 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2020-11-07 00:41:38,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-11-07 00:41:38,864 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 00:41:38,864 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 00:41:38,865 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-07 00:41:38,865 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 00:41:38,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 00:41:38,866 INFO L82 PathProgramCache]: Analyzing trace with hash -308032267, now seen corresponding path program 1 times [2020-11-07 00:41:38,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 00:41:38,866 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166937665] [2020-11-07 00:41:38,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 00:41:38,869 INFO L328 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-11-07 00:41:38,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:38,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 00:41:38,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:38,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-11-07 00:41:38,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:39,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 00:41:39,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:39,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 00:41:39,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:39,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 00:41:39,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:39,115 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-07 00:41:39,116 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166937665] [2020-11-07 00:41:39,117 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 00:41:39,117 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-11-07 00:41:39,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187422316] [2020-11-07 00:41:39,118 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-07 00:41:39,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 00:41:39,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-07 00:41:39,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-11-07 00:41:39,120 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 10 states. [2020-11-07 00:41:39,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 00:41:39,765 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2020-11-07 00:41:39,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-07 00:41:39,770 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-11-07 00:41:39,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 00:41:39,772 INFO L225 Difference]: With dead ends: 75 [2020-11-07 00:41:39,772 INFO L226 Difference]: Without dead ends: 68 [2020-11-07 00:41:39,774 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2020-11-07 00:41:39,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-11-07 00:41:39,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 56. [2020-11-07 00:41:39,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-07 00:41:39,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-11-07 00:41:39,810 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 49 [2020-11-07 00:41:39,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 00:41:39,813 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-11-07 00:41:39,813 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-07 00:41:39,813 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-11-07 00:41:39,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-11-07 00:41:39,815 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 00:41:39,815 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1] [2020-11-07 00:41:39,816 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-07 00:41:39,816 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 00:41:39,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 00:41:39,819 INFO L82 PathProgramCache]: Analyzing trace with hash -1623603797, now seen corresponding path program 2 times [2020-11-07 00:41:39,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 00:41:39,820 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232439311] [2020-11-07 00:41:39,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 00:41:39,826 INFO L328 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-11-07 00:41:39,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:39,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 00:41:39,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:39,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-11-07 00:41:39,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:39,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 00:41:39,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:40,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 00:41:40,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:40,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 00:41:40,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:40,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 00:41:40,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 00:41:40,124 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-07 00:41:40,126 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232439311] [2020-11-07 00:41:40,126 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 00:41:40,126 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-11-07 00:41:40,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953837162] [2020-11-07 00:41:40,127 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-07 00:41:40,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 00:41:40,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-07 00:41:40,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-11-07 00:41:40,129 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 11 states. [2020-11-07 00:41:40,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 00:41:40,701 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2020-11-07 00:41:40,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-07 00:41:40,701 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 57 [2020-11-07 00:41:40,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 00:41:40,704 INFO L225 Difference]: With dead ends: 85 [2020-11-07 00:41:40,704 INFO L226 Difference]: Without dead ends: 78 [2020-11-07 00:41:40,705 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2020-11-07 00:41:40,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-11-07 00:41:40,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 61. [2020-11-07 00:41:40,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-11-07 00:41:40,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2020-11-07 00:41:40,727 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2020-11-07 00:41:40,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 00:41:40,728 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2020-11-07 00:41:40,728 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-07 00:41:40,728 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2020-11-07 00:41:40,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-11-07 00:41:40,729 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 00:41:40,729 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1] [2020-11-07 00:41:40,730 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-07 00:41:40,730 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 00:41:40,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 00:41:40,731 INFO L82 PathProgramCache]: Analyzing trace with hash -1353914187, now seen corresponding path program 2 times [2020-11-07 00:41:40,731 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 00:41:40,731 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903910391] [2020-11-07 00:41:40,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 00:41:40,735 INFO L328 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-11-07 00:41:40,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 00:41:40,755 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 00:41:40,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 00:41:40,773 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 00:41:40,818 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-11-07 00:41:40,819 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-07 00:41:40,819 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-07 00:41:40,848 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 12:41:40 BoogieIcfgContainer [2020-11-07 00:41:40,848 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-07 00:41:40,853 INFO L168 Benchmark]: Toolchain (without parser) took 5471.13 ms. Allocated memory was 154.1 MB in the beginning and 185.6 MB in the end (delta: 31.5 MB). Free memory was 130.7 MB in the beginning and 81.9 MB in the end (delta: 48.8 MB). Peak memory consumption was 81.8 MB. Max. memory is 8.0 GB. [2020-11-07 00:41:40,854 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 154.1 MB. Free memory is still 129.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-07 00:41:40,858 INFO L168 Benchmark]: CACSL2BoogieTranslator took 255.67 ms. Allocated memory is still 154.1 MB. Free memory was 130.0 MB in the beginning and 120.3 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-11-07 00:41:40,861 INFO L168 Benchmark]: Boogie Preprocessor took 36.58 ms. Allocated memory is still 154.1 MB. Free memory was 120.3 MB in the beginning and 119.0 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-11-07 00:41:40,867 INFO L168 Benchmark]: RCFGBuilder took 441.19 ms. Allocated memory is still 154.1 MB. Free memory was 118.9 MB in the beginning and 105.0 MB in the end (delta: 13.8 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2020-11-07 00:41:40,868 INFO L168 Benchmark]: TraceAbstraction took 4722.92 ms. Allocated memory was 154.1 MB in the beginning and 185.6 MB in the end (delta: 31.5 MB). Free memory was 104.6 MB in the beginning and 81.9 MB in the end (delta: 22.8 MB). Peak memory consumption was 54.5 MB. Max. memory is 8.0 GB. [2020-11-07 00:41:40,877 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 154.1 MB. Free memory is still 129.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 255.67 ms. Allocated memory is still 154.1 MB. Free memory was 130.0 MB in the beginning and 120.3 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 36.58 ms. Allocated memory is still 154.1 MB. Free memory was 120.3 MB in the beginning and 119.0 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 441.19 ms. Allocated memory is still 154.1 MB. Free memory was 118.9 MB in the beginning and 105.0 MB in the end (delta: 13.8 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 4722.92 ms. Allocated memory was 154.1 MB in the beginning and 185.6 MB in the end (delta: 31.5 MB). Free memory was 104.6 MB in the beginning and 81.9 MB in the end (delta: 22.8 MB). Peak memory consumption was 54.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L20] int input = 5; [L21] CALL, EXPR id(input) [L10] COND FALSE !(x==0) [L11] CALL, EXPR id2(x-1) [L15] COND FALSE !(x==0) [L16] CALL, EXPR id(x-1) [L10] COND FALSE !(x==0) [L11] CALL, EXPR id2(x-1) [L15] COND FALSE !(x==0) [L16] CALL, EXPR id(x-1) [L10] COND FALSE !(x==0) [L11] CALL, EXPR id2(x-1) [L15] COND TRUE x==0 [L15] return 0; [L11] RET, EXPR id2(x-1) [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) [L11] return id2(x-1) + 1; [L21] RET, EXPR id(input) [L21] int result = id(input); [L22] COND TRUE result == 5 [L23] CALL reach_error() [L4] __assert_fail("0", "id2_i5_o5-1.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 46 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.6s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 175 SDtfs, 283 SDslu, 380 SDs, 0 SdLazy, 612 SolverSat, 86 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 101 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 1.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=61occurred in iteration=5, 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, 5 MinimizatonAttempts, 38 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...