/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/id_build.i


--------------------------------------------------------------------------------


This is Ultimate 0.1.25-c90d42b
[2020-09-24 17:21:42,432 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-09-24 17:21:42,437 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-09-24 17:21:42,463 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-09-24 17:21:42,464 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-09-24 17:21:42,465 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-09-24 17:21:42,467 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2020-09-24 17:21:42,470 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-09-24 17:21:42,471 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-09-24 17:21:42,472 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-09-24 17:21:42,474 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-09-24 17:21:42,474 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-09-24 17:21:42,475 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-09-24 17:21:42,476 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-09-24 17:21:42,478 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-09-24 17:21:42,478 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-09-24 17:21:42,479 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-09-24 17:21:42,481 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-09-24 17:21:42,483 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-09-24 17:21:42,485 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-09-24 17:21:42,486 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-09-24 17:21:42,487 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-09-24 17:21:42,488 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-09-24 17:21:42,490 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-09-24 17:21:42,491 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-09-24 17:21:42,491 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-09-24 17:21:42,492 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-09-24 17:21:42,493 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-09-24 17:21:42,494 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-09-24 17:21:42,494 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-09-24 17:21:42,495 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-09-24 17:21:42,496 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-09-24 17:21:42,497 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-09-24 17:21:42,498 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-09-24 17:21:42,498 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
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[2020-09-24 17:21:42,499 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-09-24 17:21:42,501 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-09-24 17:21:42,502 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-09-24 17:21:42,530 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-09-24 17:21:42,530 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-09-24 17:21:42,531 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-09-24 17:21:42,531 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-09-24 17:21:42,532 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-09-24 17:21:42,532 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-09-24 17:21:42,532 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-09-24 17:21:42,532 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-09-24 17:21:42,532 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-09-24 17:21:42,533 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-09-24 17:21:42,533 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-09-24 17:21:42,533 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-09-24 17:21:42,533 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-09-24 17:21:42,533 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-09-24 17:21:42,534 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-09-24 17:21:42,534 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-09-24 17:21:42,534 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-09-24 17:21:42,534 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-09-24 17:21:42,535 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-09-24 17:21:42,535 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-09-24 17:21:42,535 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-09-24 17:21:42,535 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-09-24 17:21:42,535 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-09-24 17:21:42,536 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-09-24 17:21:42,536 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-09-24 17:21:42,536 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-09-24 17:21:42,536 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-09-24 17:21:42,536 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-09-24 17:21:42,537 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-09-24 17:21:42,537 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
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: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;log-additional-information=true;
[2020-09-24 17:21:43,015 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-09-24 17:21:43,042 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-09-24 17:21:43,047 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-09-24 17:21:43,052 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-09-24 17:21:43,053 INFO  L275        PluginConnector]: CDTParser initialized
[2020-09-24 17:21:43,055 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/id_build.i
[2020-09-24 17:21:43,151 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dfb479b60/c50d205eb0df478b9ce683e99094c255/FLAGd8eea2616
[2020-09-24 17:21:43,686 INFO  L306              CDTParser]: Found 1 translation units.
[2020-09-24 17:21:43,687 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-invgen/id_build.i
[2020-09-24 17:21:43,696 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dfb479b60/c50d205eb0df478b9ce683e99094c255/FLAGd8eea2616
[2020-09-24 17:21:44,048 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dfb479b60/c50d205eb0df478b9ce683e99094c255
[2020-09-24 17:21:44,061 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-09-24 17:21:44,067 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-09-24 17:21:44,068 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-09-24 17:21:44,069 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-09-24 17:21:44,073 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-09-24 17:21:44,074 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 05:21:44" (1/1) ...
[2020-09-24 17:21:44,079 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f6c3fe1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44, skipping insertion in model container
[2020-09-24 17:21:44,079 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 05:21:44" (1/1) ...
[2020-09-24 17:21:44,088 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-09-24 17:21:44,113 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-09-24 17:21:44,323 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-24 17:21:44,329 INFO  L203         MainTranslator]: Completed pre-run
[2020-09-24 17:21:44,350 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-24 17:21:44,369 INFO  L208         MainTranslator]: Completed translation
[2020-09-24 17:21:44,369 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44 WrapperNode
[2020-09-24 17:21:44,369 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-09-24 17:21:44,370 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-09-24 17:21:44,371 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-09-24 17:21:44,371 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-09-24 17:21:44,385 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44" (1/1) ...
[2020-09-24 17:21:44,385 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44" (1/1) ...
[2020-09-24 17:21:44,463 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44" (1/1) ...
[2020-09-24 17:21:44,464 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44" (1/1) ...
[2020-09-24 17:21:44,468 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44" (1/1) ...
[2020-09-24 17:21:44,475 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44" (1/1) ...
[2020-09-24 17:21:44,476 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44" (1/1) ...
[2020-09-24 17:21:44,478 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-09-24 17:21:44,478 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-09-24 17:21:44,478 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-09-24 17:21:44,479 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-09-24 17:21:44,480 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/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
[2020-09-24 17:21:44,564 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-09-24 17:21:44,564 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-09-24 17:21:44,565 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-09-24 17:21:44,565 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-09-24 17:21:44,566 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-09-24 17:21:44,566 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-09-24 17:21:44,566 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-09-24 17:21:44,567 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-09-24 17:21:44,567 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-09-24 17:21:44,568 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-09-24 17:21:44,569 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-09-24 17:21:44,569 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-09-24 17:21:44,569 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-09-24 17:21:44,796 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-09-24 17:21:44,796 INFO  L295             CfgBuilder]: Removed 2 assume(true) statements.
[2020-09-24 17:21:44,801 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 05:21:44 BoogieIcfgContainer
[2020-09-24 17:21:44,802 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-09-24 17:21:44,803 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-09-24 17:21:44,803 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-09-24 17:21:44,807 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-09-24 17:21:44,807 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 05:21:44" (1/3) ...
[2020-09-24 17:21:44,808 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a95e166 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 05:21:44, skipping insertion in model container
[2020-09-24 17:21:44,809 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:21:44" (2/3) ...
[2020-09-24 17:21:44,809 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a95e166 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 05:21:44, skipping insertion in model container
[2020-09-24 17:21:44,809 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 05:21:44" (3/3) ...
[2020-09-24 17:21:44,812 INFO  L109   eAbstractionObserver]: Analyzing ICFG id_build.i
[2020-09-24 17:21:44,826 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-09-24 17:21:44,840 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-09-24 17:21:44,867 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-09-24 17:21:44,917 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-09-24 17:21:44,918 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-09-24 17:21:44,918 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-09-24 17:21:44,918 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-09-24 17:21:44,919 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-09-24 17:21:44,919 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-09-24 17:21:44,919 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-09-24 17:21:44,919 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-09-24 17:21:44,966 INFO  L276                IsEmpty]: Start isEmpty. Operand 34 states.
[2020-09-24 17:21:44,975 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2020-09-24 17:21:44,975 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:21:44,977 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:21:44,978 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:21:44,986 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:21:44,987 INFO  L82        PathProgramCache]: Analyzing trace with hash 2141903635, now seen corresponding path program 1 times
[2020-09-24 17:21:44,998 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:21:44,999 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441445552]
[2020-09-24 17:21:44,999 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:21:45,175 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:45,199 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:45,292 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:45,293 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 28
[2020-09-24 17:21:45,293 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:45,293 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 113
[2020-09-24 17:21:45,295 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:45,295 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 4
[2020-09-24 17:21:45,295 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 19
[2020-09-24 17:21:45,296 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 8
[2020-09-24 17:21:45,296 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 2
[2020-09-24 17:21:45,404 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:21:45,405 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:45,407 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:45,409 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:45,409 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:21:45,409 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:45,409 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 3
[2020-09-24 17:21:45,410 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:45,410 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:21:45,410 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:45,411 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:21:45,411 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:21:45,426 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:21:45,427 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441445552]
[2020-09-24 17:21:45,431 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-24 17:21:45,431 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-09-24 17:21:45,432 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206627093]
[2020-09-24 17:21:45,438 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-09-24 17:21:45,439 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:21:45,452 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-09-24 17:21:45,453 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-09-24 17:21:45,455 INFO  L87              Difference]: Start difference. First operand 34 states. Second operand 5 states.
[2020-09-24 17:21:45,579 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:21:45,580 INFO  L93              Difference]: Finished difference Result 60 states and 72 transitions.
[2020-09-24 17:21:45,580 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-09-24 17:21:45,582 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 19
[2020-09-24 17:21:45,582 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:21:45,592 INFO  L225             Difference]: With dead ends: 60
[2020-09-24 17:21:45,593 INFO  L226             Difference]: Without dead ends: 33
[2020-09-24 17:21:45,598 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-09-24 17:21:45,615 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 33 states.
[2020-09-24 17:21:45,637 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33.
[2020-09-24 17:21:45,639 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 33 states.
[2020-09-24 17:21:45,640 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions.
[2020-09-24 17:21:45,643 INFO  L78                 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 19
[2020-09-24 17:21:45,643 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:21:45,643 INFO  L479      AbstractCegarLoop]: Abstraction has 33 states and 34 transitions.
[2020-09-24 17:21:45,643 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-09-24 17:21:45,644 INFO  L276                IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions.
[2020-09-24 17:21:45,645 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 25
[2020-09-24 17:21:45,645 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:21:45,645 INFO  L422         BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:21:45,646 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-09-24 17:21:45,646 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:21:45,646 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:21:45,647 INFO  L82        PathProgramCache]: Analyzing trace with hash -1520201371, now seen corresponding path program 1 times
[2020-09-24 17:21:45,647 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:21:45,647 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [57746247]
[2020-09-24 17:21:45,648 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:21:45,661 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:45,674 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:45,780 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:45,780 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 35
[2020-09-24 17:21:45,780 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:45,781 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 116
[2020-09-24 17:21:45,783 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:45,783 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 4
[2020-09-24 17:21:45,783 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 18
[2020-09-24 17:21:45,783 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 16
[2020-09-24 17:21:45,784 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:21:45,881 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:21:45,883 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:45,885 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:45,890 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:45,890 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:21:45,890 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:45,891 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 5
[2020-09-24 17:21:45,891 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:45,892 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:21:45,892 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:45,892 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:21:45,893 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:21:45,899 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15
[2020-09-24 17:21:45,904 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:45,910 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:45,950 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:45,950 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 10
[2020-09-24 17:21:45,952 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:45,952 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 42
[2020-09-24 17:21:45,953 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:45,953 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 2
[2020-09-24 17:21:45,953 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:45,953 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 6
[2020-09-24 17:21:45,954 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:45,965 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:21:45,967 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [57746247]
[2020-09-24 17:21:45,967 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-24 17:21:45,967 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-09-24 17:21:45,968 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601711275]
[2020-09-24 17:21:45,971 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-09-24 17:21:45,972 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:21:45,972 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-09-24 17:21:45,972 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-09-24 17:21:45,972 INFO  L87              Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 5 states.
[2020-09-24 17:21:46,036 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:21:46,036 INFO  L93              Difference]: Finished difference Result 49 states and 52 transitions.
[2020-09-24 17:21:46,037 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-09-24 17:21:46,037 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 24
[2020-09-24 17:21:46,037 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:21:46,039 INFO  L225             Difference]: With dead ends: 49
[2020-09-24 17:21:46,040 INFO  L226             Difference]: Without dead ends: 47
[2020-09-24 17:21:46,041 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-09-24 17:21:46,041 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 47 states.
[2020-09-24 17:21:46,055 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45.
[2020-09-24 17:21:46,056 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 45 states.
[2020-09-24 17:21:46,057 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions.
[2020-09-24 17:21:46,057 INFO  L78                 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 24
[2020-09-24 17:21:46,058 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:21:46,058 INFO  L479      AbstractCegarLoop]: Abstraction has 45 states and 48 transitions.
[2020-09-24 17:21:46,058 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-09-24 17:21:46,058 INFO  L276                IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions.
[2020-09-24 17:21:46,061 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 31
[2020-09-24 17:21:46,061 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:21:46,062 INFO  L422         BasicCegarLoop]: trace histogram [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]
[2020-09-24 17:21:46,062 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-09-24 17:21:46,062 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:21:46,062 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:21:46,063 INFO  L82        PathProgramCache]: Analyzing trace with hash -1589830701, now seen corresponding path program 1 times
[2020-09-24 17:21:46,063 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:21:46,063 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1039935514]
[2020-09-24 17:21:46,063 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:21:46,073 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:46,085 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:46,149 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:46,344 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:46,345 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 41
[2020-09-24 17:21:46,345 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-09-24 17:21:46,345 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 270
[2020-09-24 17:21:46,346 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:46,346 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 2
[2020-09-24 17:21:46,346 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 20
[2020-09-24 17:21:46,346 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 2
[2020-09-24 17:21:46,347 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:21:46,357 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:21:46,358 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:46,360 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:46,361 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:46,361 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:21:46,362 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:46,362 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-09-24 17:21:46,362 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:46,363 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:21:46,363 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:46,363 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:21:46,363 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:21:46,365 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21
[2020-09-24 17:21:46,366 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:46,368 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:46,375 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:46,375 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 10
[2020-09-24 17:21:46,376 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:46,376 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 7
[2020-09-24 17:21:46,376 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:46,376 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:21:46,377 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 7
[2020-09-24 17:21:46,377 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:21:46,377 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:21:46,381 INFO  L134       CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:21:46,382 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1039935514]
[2020-09-24 17:21:46,382 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-24 17:21:46,382 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-09-24 17:21:46,383 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662342530]
[2020-09-24 17:21:46,383 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-09-24 17:21:46,383 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:21:46,384 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-09-24 17:21:46,384 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-09-24 17:21:46,384 INFO  L87              Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 3 states.
[2020-09-24 17:21:46,426 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:21:46,426 INFO  L93              Difference]: Finished difference Result 76 states and 86 transitions.
[2020-09-24 17:21:46,427 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-09-24 17:21:46,427 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 30
[2020-09-24 17:21:46,427 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:21:46,428 INFO  L225             Difference]: With dead ends: 76
[2020-09-24 17:21:46,428 INFO  L226             Difference]: Without dead ends: 55
[2020-09-24 17:21:46,429 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-09-24 17:21:46,430 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 55 states.
[2020-09-24 17:21:46,442 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47.
[2020-09-24 17:21:46,442 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 47 states.
[2020-09-24 17:21:46,444 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions.
[2020-09-24 17:21:46,444 INFO  L78                 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 30
[2020-09-24 17:21:46,444 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:21:46,445 INFO  L479      AbstractCegarLoop]: Abstraction has 47 states and 50 transitions.
[2020-09-24 17:21:46,445 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-09-24 17:21:46,445 INFO  L276                IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions.
[2020-09-24 17:21:46,447 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 45
[2020-09-24 17:21:46,447 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:21:46,447 INFO  L422         BasicCegarLoop]: trace histogram [4, 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]
[2020-09-24 17:21:46,447 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-09-24 17:21:46,448 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:21:46,448 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:21:46,448 INFO  L82        PathProgramCache]: Analyzing trace with hash 156681780, now seen corresponding path program 1 times
[2020-09-24 17:21:46,448 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:21:46,449 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192078789]
[2020-09-24 17:21:46,449 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:21:46,471 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:46,493 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:46,548 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:46,578 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:47,233 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:47,234 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 59
[2020-09-24 17:21:47,238 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 3
[2020-09-24 17:21:47,239 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 759
[2020-09-24 17:21:47,239 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:47,239 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 6
[2020-09-24 17:21:47,239 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 18
[2020-09-24 17:21:47,240 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 40
[2020-09-24 17:21:47,240 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:47,306 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:21:47,306 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:47,308 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:47,309 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:47,309 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:21:47,309 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:47,310 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-09-24 17:21:47,310 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:47,310 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:21:47,310 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:47,310 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:21:47,311 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:47,312 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15
[2020-09-24 17:21:47,314 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:47,315 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:47,323 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:47,323 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 10
[2020-09-24 17:21:47,324 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:47,324 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 9
[2020-09-24 17:21:47,324 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:47,324 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 2
[2020-09-24 17:21:47,324 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:47,325 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 6
[2020-09-24 17:21:47,325 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:47,327 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20
[2020-09-24 17:21:47,329 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:47,331 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:47,340 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:47,340 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 10
[2020-09-24 17:21:47,340 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:47,340 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 10
[2020-09-24 17:21:47,341 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:47,341 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 2
[2020-09-24 17:21:47,341 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:47,341 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 6
[2020-09-24 17:21:47,341 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:47,344 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35
[2020-09-24 17:21:47,345 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:47,347 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:47,357 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:47,357 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 10
[2020-09-24 17:21:47,357 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:47,357 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 10
[2020-09-24 17:21:47,358 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:47,358 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 2
[2020-09-24 17:21:47,358 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:47,358 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 6
[2020-09-24 17:21:47,358 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:47,366 INFO  L134       CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked.
[2020-09-24 17:21:47,366 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192078789]
[2020-09-24 17:21:47,366 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:21:47,366 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7
[2020-09-24 17:21:47,367 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908694303]
[2020-09-24 17:21:47,367 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-09-24 17:21:47,368 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:21:47,368 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-09-24 17:21:47,368 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42
[2020-09-24 17:21:47,368 INFO  L87              Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 7 states.
[2020-09-24 17:21:47,505 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:21:47,505 INFO  L93              Difference]: Finished difference Result 67 states and 72 transitions.
[2020-09-24 17:21:47,506 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-09-24 17:21:47,506 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 44
[2020-09-24 17:21:47,507 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:21:47,508 INFO  L225             Difference]: With dead ends: 67
[2020-09-24 17:21:47,508 INFO  L226             Difference]: Without dead ends: 65
[2020-09-24 17:21:47,509 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90
[2020-09-24 17:21:47,509 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 65 states.
[2020-09-24 17:21:47,520 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63.
[2020-09-24 17:21:47,520 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 63 states.
[2020-09-24 17:21:47,522 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions.
[2020-09-24 17:21:47,522 INFO  L78                 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 44
[2020-09-24 17:21:47,522 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:21:47,523 INFO  L479      AbstractCegarLoop]: Abstraction has 63 states and 68 transitions.
[2020-09-24 17:21:47,523 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-09-24 17:21:47,523 INFO  L276                IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions.
[2020-09-24 17:21:47,525 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 65
[2020-09-24 17:21:47,525 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:21:47,525 INFO  L422         BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:21:47,526 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-09-24 17:21:47,526 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:21:47,526 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:21:47,527 INFO  L82        PathProgramCache]: Analyzing trace with hash 928415107, now seen corresponding path program 2 times
[2020-09-24 17:21:47,527 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:21:47,527 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939148815]
[2020-09-24 17:21:47,527 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:21:47,539 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:47,549 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:47,570 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:47,807 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:47,857 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:47,901 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:58,557 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:58,558 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 83
[2020-09-24 17:21:58,558 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 5
[2020-09-24 17:21:58,558 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 11017
[2020-09-24 17:21:58,559 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:58,559 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 4
[2020-09-24 17:21:58,559 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 44
[2020-09-24 17:21:58,559 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 20
[2020-09-24 17:21:58,559 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:58,592 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:21:58,592 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:58,593 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:58,595 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:58,595 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:21:58,595 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:58,596 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-09-24 17:21:58,596 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:58,596 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:21:58,596 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:58,596 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:21:58,597 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:58,598 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15
[2020-09-24 17:21:58,598 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:58,600 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:58,603 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:58,603 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 10
[2020-09-24 17:21:58,604 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:58,604 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 4
[2020-09-24 17:21:58,604 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:58,607 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:21:58,607 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:58,607 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:21:58,607 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 3
[2020-09-24 17:21:58,609 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20
[2020-09-24 17:21:58,609 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:58,610 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:58,613 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:58,614 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 10
[2020-09-24 17:21:58,614 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:58,614 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 3
[2020-09-24 17:21:58,614 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:58,614 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:21:58,615 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:58,617 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:21:58,617 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 3
[2020-09-24 17:21:58,620 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35
[2020-09-24 17:21:58,624 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:58,626 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:58,633 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:58,634 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 10
[2020-09-24 17:21:58,634 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:58,634 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 8
[2020-09-24 17:21:58,634 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:58,634 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 2
[2020-09-24 17:21:58,635 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:58,635 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 6
[2020-09-24 17:21:58,635 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:58,637 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40
[2020-09-24 17:21:58,638 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:58,640 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:58,646 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:58,646 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 10
[2020-09-24 17:21:58,646 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:58,646 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 6
[2020-09-24 17:21:58,646 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:58,647 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 2
[2020-09-24 17:21:58,647 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:21:58,647 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 6
[2020-09-24 17:21:58,647 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:58,649 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55
[2020-09-24 17:21:58,650 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:58,652 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:58,656 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:21:58,656 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 10
[2020-09-24 17:21:58,657 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:21:58,657 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 5
[2020-09-24 17:21:58,657 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:21:58,657 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:21:58,657 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 7
[2020-09-24 17:21:58,658 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:21:58,658 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:21:58,664 INFO  L134       CoverageAnalysis]: Checked inductivity of 78 backedges. 34 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked.
[2020-09-24 17:21:58,664 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939148815]
[2020-09-24 17:21:58,664 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:21:58,664 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5
[2020-09-24 17:21:58,665 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325597838]
[2020-09-24 17:21:58,667 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-09-24 17:21:58,667 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:21:58,668 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-09-24 17:21:58,668 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20
[2020-09-24 17:21:58,669 INFO  L87              Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 5 states.
[2020-09-24 17:21:58,755 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:21:58,755 INFO  L93              Difference]: Finished difference Result 131 states and 154 transitions.
[2020-09-24 17:21:58,757 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-09-24 17:21:58,757 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 64
[2020-09-24 17:21:58,758 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:21:58,759 INFO  L225             Difference]: With dead ends: 131
[2020-09-24 17:21:58,759 INFO  L226             Difference]: Without dead ends: 93
[2020-09-24 17:21:58,761 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42
[2020-09-24 17:21:58,762 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 93 states.
[2020-09-24 17:21:58,787 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 81.
[2020-09-24 17:21:58,787 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 81 states.
[2020-09-24 17:21:58,789 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 92 transitions.
[2020-09-24 17:21:58,789 INFO  L78                 Accepts]: Start accepts. Automaton has 81 states and 92 transitions. Word has length 64
[2020-09-24 17:21:58,789 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:21:58,790 INFO  L479      AbstractCegarLoop]: Abstraction has 81 states and 92 transitions.
[2020-09-24 17:21:58,790 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-09-24 17:21:58,790 INFO  L276                IsEmpty]: Start isEmpty. Operand 81 states and 92 transitions.
[2020-09-24 17:21:58,791 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 93
[2020-09-24 17:21:58,792 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:21:58,792 INFO  L422         BasicCegarLoop]: trace histogram [10, 9, 9, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:21:58,792 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-09-24 17:21:58,792 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:21:58,793 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:21:58,793 INFO  L82        PathProgramCache]: Analyzing trace with hash 256669765, now seen corresponding path program 3 times
[2020-09-24 17:21:58,793 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:21:58,793 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653660776]
[2020-09-24 17:21:58,794 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:21:58,803 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:21:58,815 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:58,847 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:59,354 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:59,385 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:59,431 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:21:59,473 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:22:01,742 FATAL L256   erpolLogProxyWrapper]: Now shrinking...