/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-24 02:24:30,457 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-24 02:24:30,460 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-24 02:24:30,494 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-24 02:24:30,550 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-24 02:24:30,562 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-24 02:24:30,563 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-24 02:24:30,564 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-24 02:24:30,564 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-24 02:24:30,565 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-24 02:24:30,565 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-24 02:24:30,565 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-24 02:24:30,565 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-24 02:24:30,565 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-24 02:24:30,566 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-24 02:24:30,566 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-24 02:24:30,566 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-24 02:24:30,566 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-24 02:24:30,566 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-24 02:24:30,567 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-24 02:24:30,567 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-24 02:24:30,567 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-24 02:24:30,567 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-24 02:24:30,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-24 02:24:30,568 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-24 02:24:30,568 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-24 02:24:30,568 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-24 02:24:30,568 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-10-24 02:24:30,968 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-24 02:24:30,998 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-24 02:24:31,001 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-24 02:24:31,002 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-24 02:24:31,003 INFO L275 PluginConnector]: CDTParser initialized [2020-10-24 02:24:31,004 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-10-24 02:24:31,089 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98e44f145/c6d2c7da3f4f4c53a4b4b320a462d66c/FLAGf6be717ec [2020-10-24 02:24:31,924 INFO L306 CDTParser]: Found 1 translation units. [2020-10-24 02:24:31,925 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2020-10-24 02:24:31,935 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98e44f145/c6d2c7da3f4f4c53a4b4b320a462d66c/FLAGf6be717ec [2020-10-24 02:24:32,262 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98e44f145/c6d2c7da3f4f4c53a4b4b320a462d66c [2020-10-24 02:24:32,266 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-24 02:24:32,275 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-24 02:24:32,281 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-24 02:24:32,281 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-24 02:24:32,285 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-24 02:24:32,286 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 02:24:32" (1/1) ... [2020-10-24 02:24:32,290 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d29fcf4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32, skipping insertion in model container [2020-10-24 02:24:32,290 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 02:24:32" (1/1) ... [2020-10-24 02:24:32,299 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-24 02:24:32,324 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-24 02:24:32,559 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 02:24:32,569 INFO L203 MainTranslator]: Completed pre-run [2020-10-24 02:24:32,597 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 02:24:32,614 INFO L208 MainTranslator]: Completed translation [2020-10-24 02:24:32,615 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32 WrapperNode [2020-10-24 02:24:32,615 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-24 02:24:32,616 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-24 02:24:32,616 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-24 02:24:32,616 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-24 02:24:32,630 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32" (1/1) ... [2020-10-24 02:24:32,631 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32" (1/1) ... [2020-10-24 02:24:32,641 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32" (1/1) ... [2020-10-24 02:24:32,641 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32" (1/1) ... [2020-10-24 02:24:32,653 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32" (1/1) ... [2020-10-24 02:24:32,662 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32" (1/1) ... [2020-10-24 02:24:32,664 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32" (1/1) ... [2020-10-24 02:24:32,667 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-24 02:24:32,668 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-24 02:24:32,668 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-24 02:24:32,669 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-24 02:24:32,670 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32" (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 [2020-10-24 02:24:32,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-24 02:24:32,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-24 02:24:32,750 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-24 02:24:32,750 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-24 02:24:32,750 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-24 02:24:32,751 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-24 02:24:32,751 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-24 02:24:32,751 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-24 02:24:32,751 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2020-10-24 02:24:32,752 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2020-10-24 02:24:32,752 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-24 02:24:32,752 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-24 02:24:32,752 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-24 02:24:32,752 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-24 02:24:32,753 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-10-24 02:24:32,753 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-24 02:24:32,753 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-24 02:24:32,753 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-24 02:24:32,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-24 02:24:32,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-24 02:24:32,754 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-24 02:24:32,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-24 02:24:33,194 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-24 02:24:33,194 INFO L298 CfgBuilder]: Removed 5 assume(true) statements. [2020-10-24 02:24:33,196 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 02:24:33 BoogieIcfgContainer [2020-10-24 02:24:33,196 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-24 02:24:33,198 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-24 02:24:33,198 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-24 02:24:33,202 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-24 02:24:33,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 02:24:32" (1/3) ... [2020-10-24 02:24:33,203 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ad2e7d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 02:24:33, skipping insertion in model container [2020-10-24 02:24:33,203 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:24:32" (2/3) ... [2020-10-24 02:24:33,204 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ad2e7d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 02:24:33, skipping insertion in model container [2020-10-24 02:24:33,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 02:24:33" (3/3) ... [2020-10-24 02:24:33,206 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-10-24 02:24:33,230 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-24 02:24:33,238 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-24 02:24:33,251 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-24 02:24:33,275 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-24 02:24:33,275 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-24 02:24:33,275 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-24 02:24:33,276 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-24 02:24:33,276 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-24 02:24:33,276 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-24 02:24:33,276 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-24 02:24:33,276 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-24 02:24:33,296 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states. [2020-10-24 02:24:33,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-10-24 02:24:33,308 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:33,309 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:24:33,309 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:33,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:33,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1931188946, now seen corresponding path program 1 times [2020-10-24 02:24:33,326 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:33,327 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2090174255] [2020-10-24 02:24:33,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:33,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:33,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:24:33,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:33,631 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 02:24:33,632 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2090174255] [2020-10-24 02:24:33,635 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-24 02:24:33,635 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-24 02:24:33,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604342467] [2020-10-24 02:24:33,643 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-24 02:24:33,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:24:33,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-24 02:24:33,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-24 02:24:33,684 INFO L87 Difference]: Start difference. First operand 115 states. Second operand 3 states. [2020-10-24 02:24:34,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:24:34,015 INFO L93 Difference]: Finished difference Result 200 states and 230 transitions. [2020-10-24 02:24:34,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-24 02:24:34,017 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 43 [2020-10-24 02:24:34,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:24:34,027 INFO L225 Difference]: With dead ends: 200 [2020-10-24 02:24:34,027 INFO L226 Difference]: Without dead ends: 83 [2020-10-24 02:24:34,032 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 [2020-10-24 02:24:34,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-10-24 02:24:34,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2020-10-24 02:24:34,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-10-24 02:24:34,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 88 transitions. [2020-10-24 02:24:34,087 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 88 transitions. Word has length 43 [2020-10-24 02:24:34,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:24:34,087 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 88 transitions. [2020-10-24 02:24:34,087 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-24 02:24:34,088 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 88 transitions. [2020-10-24 02:24:34,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-10-24 02:24:34,089 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:34,090 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:24:34,090 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-24 02:24:34,090 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:34,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:34,091 INFO L82 PathProgramCache]: Analyzing trace with hash 1726206385, now seen corresponding path program 1 times [2020-10-24 02:24:34,092 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:34,092 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2027468924] [2020-10-24 02:24:34,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:34,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:34,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:24:34,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:34,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 02:24:34,252 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2027468924] [2020-10-24 02:24:34,252 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-24 02:24:34,253 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-24 02:24:34,253 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129477113] [2020-10-24 02:24:34,254 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-24 02:24:34,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:24:34,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-24 02:24:34,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-24 02:24:34,256 INFO L87 Difference]: Start difference. First operand 83 states and 88 transitions. Second operand 4 states. [2020-10-24 02:24:34,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:24:34,464 INFO L93 Difference]: Finished difference Result 152 states and 163 transitions. [2020-10-24 02:24:34,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-24 02:24:34,465 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 47 [2020-10-24 02:24:34,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:24:34,467 INFO L225 Difference]: With dead ends: 152 [2020-10-24 02:24:34,467 INFO L226 Difference]: Without dead ends: 95 [2020-10-24 02:24:34,468 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-24 02:24:34,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-10-24 02:24:34,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 85. [2020-10-24 02:24:34,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-10-24 02:24:34,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 90 transitions. [2020-10-24 02:24:34,485 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 90 transitions. Word has length 47 [2020-10-24 02:24:34,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:24:34,486 INFO L481 AbstractCegarLoop]: Abstraction has 85 states and 90 transitions. [2020-10-24 02:24:34,486 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-24 02:24:34,486 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 90 transitions. [2020-10-24 02:24:34,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-10-24 02:24:34,488 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:34,489 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, 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] [2020-10-24 02:24:34,489 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-24 02:24:34,489 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:34,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:34,490 INFO L82 PathProgramCache]: Analyzing trace with hash 531359868, now seen corresponding path program 1 times [2020-10-24 02:24:34,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:34,490 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988590138] [2020-10-24 02:24:34,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:34,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:34,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:24:34,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:34,616 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-24 02:24:34,616 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988590138] [2020-10-24 02:24:34,616 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:24:34,617 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-24 02:24:34,617 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753753768] [2020-10-24 02:24:34,617 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-24 02:24:34,618 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:24:34,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-24 02:24:34,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-10-24 02:24:34,619 INFO L87 Difference]: Start difference. First operand 85 states and 90 transitions. Second operand 6 states. [2020-10-24 02:24:34,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:24:34,828 INFO L93 Difference]: Finished difference Result 160 states and 170 transitions. [2020-10-24 02:24:34,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-24 02:24:34,829 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 61 [2020-10-24 02:24:34,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:24:34,830 INFO L225 Difference]: With dead ends: 160 [2020-10-24 02:24:34,830 INFO L226 Difference]: Without dead ends: 102 [2020-10-24 02:24:34,832 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-10-24 02:24:34,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-10-24 02:24:34,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 92. [2020-10-24 02:24:34,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-10-24 02:24:34,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 97 transitions. [2020-10-24 02:24:34,844 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 97 transitions. Word has length 61 [2020-10-24 02:24:34,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:24:34,844 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 97 transitions. [2020-10-24 02:24:34,844 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-24 02:24:34,844 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 97 transitions. [2020-10-24 02:24:34,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-10-24 02:24:34,847 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:34,847 INFO L422 BasicCegarLoop]: trace histogram [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, 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] [2020-10-24 02:24:34,847 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-24 02:24:34,847 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:34,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:34,848 INFO L82 PathProgramCache]: Analyzing trace with hash 2109050272, now seen corresponding path program 2 times [2020-10-24 02:24:34,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:34,849 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901207881] [2020-10-24 02:24:34,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:34,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:34,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:24:34,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:34,981 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-24 02:24:34,982 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901207881] [2020-10-24 02:24:34,982 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:24:34,983 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-24 02:24:34,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117573505] [2020-10-24 02:24:34,983 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-24 02:24:34,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:24:34,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-24 02:24:34,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-10-24 02:24:34,985 INFO L87 Difference]: Start difference. First operand 92 states and 97 transitions. Second operand 6 states. [2020-10-24 02:24:35,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:24:35,186 INFO L93 Difference]: Finished difference Result 150 states and 159 transitions. [2020-10-24 02:24:35,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-24 02:24:35,187 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 68 [2020-10-24 02:24:35,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:24:35,189 INFO L225 Difference]: With dead ends: 150 [2020-10-24 02:24:35,189 INFO L226 Difference]: Without dead ends: 104 [2020-10-24 02:24:35,190 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-10-24 02:24:35,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-10-24 02:24:35,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 99. [2020-10-24 02:24:35,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-10-24 02:24:35,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 104 transitions. [2020-10-24 02:24:35,201 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 104 transitions. Word has length 68 [2020-10-24 02:24:35,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:24:35,202 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 104 transitions. [2020-10-24 02:24:35,202 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-24 02:24:35,202 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 104 transitions. [2020-10-24 02:24:35,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-10-24 02:24:35,203 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:35,204 INFO L422 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:24:35,204 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-24 02:24:35,204 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:35,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:35,205 INFO L82 PathProgramCache]: Analyzing trace with hash -1042508207, now seen corresponding path program 3 times [2020-10-24 02:24:35,205 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:35,205 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165813888] [2020-10-24 02:24:35,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:35,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:35,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:24:35,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:35,324 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-24 02:24:35,324 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165813888] [2020-10-24 02:24:35,325 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:24:35,325 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-24 02:24:35,325 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347324032] [2020-10-24 02:24:35,326 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-24 02:24:35,326 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:24:35,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-24 02:24:35,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-10-24 02:24:35,327 INFO L87 Difference]: Start difference. First operand 99 states and 104 transitions. Second operand 8 states. [2020-10-24 02:24:35,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:24:35,599 INFO L93 Difference]: Finished difference Result 176 states and 186 transitions. [2020-10-24 02:24:35,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-24 02:24:35,600 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 75 [2020-10-24 02:24:35,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:24:35,602 INFO L225 Difference]: With dead ends: 176 [2020-10-24 02:24:35,602 INFO L226 Difference]: Without dead ends: 111 [2020-10-24 02:24:35,605 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-10-24 02:24:35,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2020-10-24 02:24:35,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 106. [2020-10-24 02:24:35,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-10-24 02:24:35,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 111 transitions. [2020-10-24 02:24:35,625 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 111 transitions. Word has length 75 [2020-10-24 02:24:35,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:24:35,626 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 111 transitions. [2020-10-24 02:24:35,629 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-24 02:24:35,629 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 111 transitions. [2020-10-24 02:24:35,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-10-24 02:24:35,634 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:35,634 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:24:35,634 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-24 02:24:35,634 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:35,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:35,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1786539125, now seen corresponding path program 4 times [2020-10-24 02:24:35,638 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:35,639 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173889666] [2020-10-24 02:24:35,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:35,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:35,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:24:35,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:35,822 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-24 02:24:35,822 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173889666] [2020-10-24 02:24:35,823 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:24:35,823 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-24 02:24:35,823 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606781432] [2020-10-24 02:24:35,824 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-24 02:24:35,824 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:24:35,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-24 02:24:35,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-10-24 02:24:35,825 INFO L87 Difference]: Start difference. First operand 106 states and 111 transitions. Second operand 10 states. [2020-10-24 02:24:36,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:24:36,161 INFO L93 Difference]: Finished difference Result 183 states and 193 transitions. [2020-10-24 02:24:36,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-24 02:24:36,162 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 82 [2020-10-24 02:24:36,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:24:36,164 INFO L225 Difference]: With dead ends: 183 [2020-10-24 02:24:36,164 INFO L226 Difference]: Without dead ends: 118 [2020-10-24 02:24:36,165 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2020-10-24 02:24:36,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-10-24 02:24:36,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 113. [2020-10-24 02:24:36,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-10-24 02:24:36,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 118 transitions. [2020-10-24 02:24:36,176 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 118 transitions. Word has length 82 [2020-10-24 02:24:36,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:24:36,177 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 118 transitions. [2020-10-24 02:24:36,177 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-24 02:24:36,177 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 118 transitions. [2020-10-24 02:24:36,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-10-24 02:24:36,178 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:36,179 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:24:36,179 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-24 02:24:36,179 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:36,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:36,180 INFO L82 PathProgramCache]: Analyzing trace with hash 2016028113, now seen corresponding path program 5 times [2020-10-24 02:24:36,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:36,180 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [187930907] [2020-10-24 02:24:36,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:36,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:36,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:24:36,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:36,347 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-24 02:24:36,348 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [187930907] [2020-10-24 02:24:36,348 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:24:36,348 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-24 02:24:36,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996250540] [2020-10-24 02:24:36,349 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-24 02:24:36,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:24:36,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-24 02:24:36,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-10-24 02:24:36,350 INFO L87 Difference]: Start difference. First operand 113 states and 118 transitions. Second operand 12 states. [2020-10-24 02:24:36,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:24:36,801 INFO L93 Difference]: Finished difference Result 185 states and 195 transitions. [2020-10-24 02:24:36,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-24 02:24:36,802 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 89 [2020-10-24 02:24:36,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:24:36,804 INFO L225 Difference]: With dead ends: 185 [2020-10-24 02:24:36,804 INFO L226 Difference]: Without dead ends: 120 [2020-10-24 02:24:36,805 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2020-10-24 02:24:36,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-10-24 02:24:36,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2020-10-24 02:24:36,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-10-24 02:24:36,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 125 transitions. [2020-10-24 02:24:36,824 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 125 transitions. Word has length 89 [2020-10-24 02:24:36,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:24:36,824 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 125 transitions. [2020-10-24 02:24:36,824 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-24 02:24:36,824 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 125 transitions. [2020-10-24 02:24:36,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-10-24 02:24:36,826 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:36,826 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:24:36,826 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-24 02:24:36,826 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:36,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:36,827 INFO L82 PathProgramCache]: Analyzing trace with hash 741764341, now seen corresponding path program 6 times [2020-10-24 02:24:36,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:36,828 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655899866] [2020-10-24 02:24:36,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:36,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:36,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:24:36,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:36,958 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-10-24 02:24:36,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655899866] [2020-10-24 02:24:36,958 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:24:36,959 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-24 02:24:36,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231179982] [2020-10-24 02:24:36,960 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-24 02:24:36,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:24:36,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-24 02:24:36,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-10-24 02:24:36,961 INFO L87 Difference]: Start difference. First operand 120 states and 125 transitions. Second operand 8 states. [2020-10-24 02:24:37,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:24:37,195 INFO L93 Difference]: Finished difference Result 178 states and 187 transitions. [2020-10-24 02:24:37,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-24 02:24:37,196 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 96 [2020-10-24 02:24:37,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:24:37,197 INFO L225 Difference]: With dead ends: 178 [2020-10-24 02:24:37,197 INFO L226 Difference]: Without dead ends: 132 [2020-10-24 02:24:37,199 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-10-24 02:24:37,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-10-24 02:24:37,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 127. [2020-10-24 02:24:37,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-10-24 02:24:37,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 132 transitions. [2020-10-24 02:24:37,210 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 132 transitions. Word has length 96 [2020-10-24 02:24:37,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:24:37,210 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 132 transitions. [2020-10-24 02:24:37,210 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-24 02:24:37,210 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 132 transitions. [2020-10-24 02:24:37,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-10-24 02:24:37,212 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:37,212 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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] [2020-10-24 02:24:37,212 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-24 02:24:37,212 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:37,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:37,217 INFO L82 PathProgramCache]: Analyzing trace with hash 1731640668, now seen corresponding path program 7 times [2020-10-24 02:24:37,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:37,217 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [609095672] [2020-10-24 02:24:37,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:37,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:37,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:24:37,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:37,400 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-10-24 02:24:37,401 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [609095672] [2020-10-24 02:24:37,402 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:24:37,402 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-24 02:24:37,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722134324] [2020-10-24 02:24:37,403 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-24 02:24:37,407 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:24:37,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-24 02:24:37,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-10-24 02:24:37,409 INFO L87 Difference]: Start difference. First operand 127 states and 132 transitions. Second operand 10 states. [2020-10-24 02:24:37,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:24:37,777 INFO L93 Difference]: Finished difference Result 185 states and 194 transitions. [2020-10-24 02:24:37,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-24 02:24:37,777 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 103 [2020-10-24 02:24:37,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:24:37,779 INFO L225 Difference]: With dead ends: 185 [2020-10-24 02:24:37,779 INFO L226 Difference]: Without dead ends: 139 [2020-10-24 02:24:37,780 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2020-10-24 02:24:37,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2020-10-24 02:24:37,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 134. [2020-10-24 02:24:37,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-10-24 02:24:37,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 139 transitions. [2020-10-24 02:24:37,798 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 139 transitions. Word has length 103 [2020-10-24 02:24:37,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:24:37,799 INFO L481 AbstractCegarLoop]: Abstraction has 134 states and 139 transitions. [2020-10-24 02:24:37,799 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-24 02:24:37,799 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 139 transitions. [2020-10-24 02:24:37,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-10-24 02:24:37,806 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:37,807 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 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, 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] [2020-10-24 02:24:37,807 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-24 02:24:37,807 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:37,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:37,808 INFO L82 PathProgramCache]: Analyzing trace with hash -170558699, now seen corresponding path program 8 times [2020-10-24 02:24:37,808 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:37,812 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849819794] [2020-10-24 02:24:37,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:37,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:37,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:24:37,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:24:37,989 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-10-24 02:24:37,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849819794] [2020-10-24 02:24:37,990 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:24:37,990 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-24 02:24:37,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537903002] [2020-10-24 02:24:37,990 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-24 02:24:37,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:24:37,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-24 02:24:37,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-10-24 02:24:37,992 INFO L87 Difference]: Start difference. First operand 134 states and 139 transitions. Second operand 12 states. [2020-10-24 02:24:38,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:24:38,434 INFO L93 Difference]: Finished difference Result 187 states and 196 transitions. [2020-10-24 02:24:38,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-24 02:24:38,434 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 110 [2020-10-24 02:24:38,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:24:38,436 INFO L225 Difference]: With dead ends: 187 [2020-10-24 02:24:38,437 INFO L226 Difference]: Without dead ends: 141 [2020-10-24 02:24:38,438 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2020-10-24 02:24:38,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2020-10-24 02:24:38,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2020-10-24 02:24:38,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2020-10-24 02:24:38,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 146 transitions. [2020-10-24 02:24:38,451 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 146 transitions. Word has length 110 [2020-10-24 02:24:38,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:24:38,453 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 146 transitions. [2020-10-24 02:24:38,453 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-24 02:24:38,453 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 146 transitions. [2020-10-24 02:24:38,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-10-24 02:24:38,459 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:24:38,459 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 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, 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] [2020-10-24 02:24:38,459 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-24 02:24:38,459 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:24:38,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:24:38,460 INFO L82 PathProgramCache]: Analyzing trace with hash -1454273732, now seen corresponding path program 9 times [2020-10-24 02:24:38,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:24:38,460 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [893369186] [2020-10-24 02:24:38,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:24:38,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-24 02:24:38,535 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-24 02:24:38,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-24 02:24:38,583 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-24 02:24:38,642 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-24 02:24:38,642 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-24 02:24:38,642 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-24 02:24:38,761 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 02:24:38 BoogieIcfgContainer [2020-10-24 02:24:38,761 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-24 02:24:38,765 INFO L168 Benchmark]: Toolchain (without parser) took 6493.71 ms. Allocated memory was 156.2 MB in the beginning and 187.7 MB in the end (delta: 31.5 MB). Free memory was 133.4 MB in the beginning and 105.1 MB in the end (delta: 28.3 MB). Peak memory consumption was 60.1 MB. Max. memory is 8.0 GB. [2020-10-24 02:24:38,765 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 125.8 MB. Free memory is still 99.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-24 02:24:38,768 INFO L168 Benchmark]: CACSL2BoogieTranslator took 334.62 ms. Allocated memory is still 156.2 MB. Free memory was 132.8 MB in the beginning and 122.5 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-10-24 02:24:38,771 INFO L168 Benchmark]: Boogie Preprocessor took 51.20 ms. Allocated memory is still 156.2 MB. Free memory was 122.5 MB in the beginning and 120.7 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-24 02:24:38,772 INFO L168 Benchmark]: RCFGBuilder took 528.30 ms. Allocated memory is still 156.2 MB. Free memory was 120.7 MB in the beginning and 121.4 MB in the end (delta: -669.6 kB). Peak memory consumption was 9.9 MB. Max. memory is 8.0 GB. [2020-10-24 02:24:38,774 INFO L168 Benchmark]: TraceAbstraction took 5562.90 ms. Allocated memory was 156.2 MB in the beginning and 187.7 MB in the end (delta: 31.5 MB). Free memory was 121.0 MB in the beginning and 105.1 MB in the end (delta: 15.9 MB). Peak memory consumption was 47.1 MB. Max. memory is 8.0 GB. [2020-10-24 02:24:38,779 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 125.8 MB. Free memory is still 99.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 334.62 ms. Allocated memory is still 156.2 MB. Free memory was 132.8 MB in the beginning and 122.5 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 51.20 ms. Allocated memory is still 156.2 MB. Free memory was 122.5 MB in the beginning and 120.7 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 528.30 ms. Allocated memory is still 156.2 MB. Free memory was 120.7 MB in the beginning and 121.4 MB in the end (delta: -669.6 kB). Peak memory consumption was 9.9 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5562.90 ms. Allocated memory was 156.2 MB in the beginning and 187.7 MB in the end (delta: 31.5 MB). Free memory was 121.0 MB in the beginning and 105.1 MB in the end (delta: 15.9 MB). Peak memory consumption was 47.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; VAL [string_A={9:0}, string_B={6:0}] [L32] int i, j, nc_A, nc_B, found=0; VAL [found=0, string_A={9:0}, string_B={6:0}] [L35] i=0 VAL [found=0, i=0, string_A={9:0}, string_B={6:0}] [L35] COND TRUE i<5 VAL [found=0, i=0, string_A={9:0}, string_B={6:0}] [L36] string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=0, string_A={9:0}, string_B={6:0}] [L35] i++ VAL [found=0, i=1, string_A={9:0}, string_B={6:0}] [L35] COND TRUE i<5 VAL [found=0, i=1, string_A={9:0}, string_B={6:0}] [L36] string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-2, found=0, i=1, string_A={9:0}, string_B={6:0}] [L35] i++ VAL [found=0, i=2, string_A={9:0}, string_B={6:0}] [L35] COND TRUE i<5 VAL [found=0, i=2, string_A={9:0}, string_B={6:0}] [L36] string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-3, found=0, i=2, string_A={9:0}, string_B={6:0}] [L35] i++ VAL [found=0, i=3, string_A={9:0}, string_B={6:0}] [L35] COND TRUE i<5 VAL [found=0, i=3, string_A={9:0}, string_B={6:0}] [L36] string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-4, found=0, i=3, string_A={9:0}, string_B={6:0}] [L35] i++ VAL [found=0, i=4, string_A={9:0}, string_B={6:0}] [L35] COND TRUE i<5 VAL [found=0, i=4, string_A={9:0}, string_B={6:0}] [L36] string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=4, string_A={9:0}, string_B={6:0}] [L35] i++ VAL [found=0, i=5, string_A={9:0}, string_B={6:0}] [L35] COND FALSE !(i<5) VAL [found=0, i=5, string_A={9:0}, string_B={6:0}] [L37] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={9:0}, string_A[5 -1]=0, string_B={6:0}] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) VAL [found=0, i=5, string_A={9:0}, string_A[5 -1]=0, string_B={6:0}] [L39] i=0 VAL [found=0, i=0, string_A={9:0}, string_B={6:0}] [L39] COND TRUE i<5 VAL [found=0, i=0, string_A={9:0}, string_B={6:0}] [L40] string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=0, string_A={9:0}, string_B={6:0}] [L39] i++ VAL [found=0, i=1, string_A={9:0}, string_B={6:0}] [L39] COND TRUE i<5 VAL [found=0, i=1, string_A={9:0}, string_B={6:0}] [L40] string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-7, found=0, i=1, string_A={9:0}, string_B={6:0}] [L39] i++ VAL [found=0, i=2, string_A={9:0}, string_B={6:0}] [L39] COND TRUE i<5 VAL [found=0, i=2, string_A={9:0}, string_B={6:0}] [L40] string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-8, found=0, i=2, string_A={9:0}, string_B={6:0}] [L39] i++ VAL [found=0, i=3, string_A={9:0}, string_B={6:0}] [L39] COND TRUE i<5 VAL [found=0, i=3, string_A={9:0}, string_B={6:0}] [L40] string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-9, found=0, i=3, string_A={9:0}, string_B={6:0}] [L39] i++ VAL [found=0, i=4, string_A={9:0}, string_B={6:0}] [L39] COND TRUE i<5 VAL [found=0, i=4, string_A={9:0}, string_B={6:0}] [L40] string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=4, string_A={9:0}, string_B={6:0}] [L39] i++ VAL [found=0, i=5, string_A={9:0}, string_B={6:0}] [L39] COND FALSE !(i<5) VAL [found=0, i=5, string_A={9:0}, string_B={6:0}] [L41] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={9:0}, string_B={6:0}, string_B[5 -1]=0] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) VAL [found=0, i=5, string_A={9:0}, string_B={6:0}, string_B[5 -1]=0] [L43] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={9:0}, string_B={6:0}] [L44] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={9:0}, string_A[nc_A]=0, string_B={6:0}] [L44] COND FALSE !(string_A[nc_A]!='\0') VAL [found=0, i=5, nc_A=0, string_A={9:0}, string_A[nc_A]=0, string_B={6:0}] [L47] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={9:0}, string_B={6:0}] [L48] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={9:0}, string_B={6:0}, string_B[nc_B]=0] [L48] COND FALSE !(string_B[nc_B]!='\0') VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={9:0}, string_B={6:0}, string_B[nc_B]=0] [L51] COND FALSE !(!(nc_B >= nc_A)) VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={9:0}, string_B={6:0}] [L54] EXPR j=0 VAL [found=0, i=5, j=0, nc_A=0, nc_B=0, string_A={9:0}, string_B={6:0}] [L54] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={9:0}, string_B={6:0}] [L55] COND FALSE !((inc_B-1)<