/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/eca-rers2012/Problem16_label42.c


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


This is Ultimate 0.2.3-dev-f954360
[2023-04-01 04:19:25,809 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2023-04-01 04:19:25,811 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2023-04-01 04:19:25,836 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2023-04-01 04:19:25,837 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2023-04-01 04:19:25,837 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2023-04-01 04:19:25,838 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2023-04-01 04:19:25,840 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2023-04-01 04:19:25,841 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2023-04-01 04:19:25,842 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2023-04-01 04:19:25,842 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2023-04-01 04:19:25,843 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2023-04-01 04:19:25,843 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
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[2023-04-01 04:19:25,845 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2023-04-01 04:19:25,846 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2023-04-01 04:19:25,846 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2023-04-01 04:19:25,847 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2023-04-01 04:19:25,848 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2023-04-01 04:19:25,850 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2023-04-01 04:19:25,851 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2023-04-01 04:19:25,852 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2023-04-01 04:19:25,853 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2023-04-01 04:19:25,854 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2023-04-01 04:19:25,857 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
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[2023-04-01 04:19:25,857 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
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[2023-04-01 04:19:25,859 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2023-04-01 04:19:25,860 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2023-04-01 04:19:25,861 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2023-04-01 04:19:25,861 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2023-04-01 04:19:25,862 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2023-04-01 04:19:25,862 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2023-04-01 04:19:25,863 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2023-04-01 04:19:25,865 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2023-04-01 04:19:25,866 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2023-04-01 04:19:25,867 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf
[2023-04-01 04:19:25,890 INFO  L113        SettingsManager]: Loading preferences was successful
[2023-04-01 04:19:25,890 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2023-04-01 04:19:25,891 INFO  L136        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2023-04-01 04:19:25,891 INFO  L138        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2023-04-01 04:19:25,892 INFO  L136        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2023-04-01 04:19:25,892 INFO  L138        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2023-04-01 04:19:25,892 INFO  L138        SettingsManager]:  * User list type=DISABLED
[2023-04-01 04:19:25,892 INFO  L136        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2023-04-01 04:19:25,892 INFO  L138        SettingsManager]:  * Explicit value domain=true
[2023-04-01 04:19:25,892 INFO  L138        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2023-04-01 04:19:25,893 INFO  L138        SettingsManager]:  * Octagon Domain=false
[2023-04-01 04:19:25,893 INFO  L138        SettingsManager]:  * Abstract domain=CompoundDomain
[2023-04-01 04:19:25,893 INFO  L138        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2023-04-01 04:19:25,893 INFO  L138        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2023-04-01 04:19:25,893 INFO  L138        SettingsManager]:  * Interval Domain=false
[2023-04-01 04:19:25,894 INFO  L136        SettingsManager]: Preferences of Sifa differ from their defaults:
[2023-04-01 04:19:25,894 INFO  L138        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2023-04-01 04:19:25,894 INFO  L138        SettingsManager]:  * Simplification Technique=POLY_PAC
[2023-04-01 04:19:25,894 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2023-04-01 04:19:25,894 INFO  L138        SettingsManager]:  * sizeof long=4
[2023-04-01 04:19:25,894 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2023-04-01 04:19:25,895 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2023-04-01 04:19:25,895 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2023-04-01 04:19:25,895 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2023-04-01 04:19:25,895 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2023-04-01 04:19:25,895 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2023-04-01 04:19:25,895 INFO  L138        SettingsManager]:  * sizeof long double=12
[2023-04-01 04:19:25,895 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2023-04-01 04:19:25,895 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2023-04-01 04:19:25,896 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2023-04-01 04:19:25,896 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2023-04-01 04:19:25,896 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2023-04-01 04:19:25,896 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-04-01 04:19:25,896 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2023-04-01 04:19:25,896 INFO  L138        SettingsManager]:  * Abstract interpretation Mode=USE_PREDICATES
[2023-04-01 04:19:25,896 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2023-04-01 04:19:25,897 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2023-04-01 04:19:25,897 INFO  L138        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2023-04-01 04:19:25,897 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2023-04-01 04:19:25,897 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2023-04-01 04:19:25,897 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2023-04-01 04:19:25,897 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
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$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain
[2023-04-01 04:19:26,114 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2023-04-01 04:19:26,132 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2023-04-01 04:19:26,134 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2023-04-01 04:19:26,135 INFO  L271        PluginConnector]: Initializing CDTParser...
[2023-04-01 04:19:26,135 INFO  L275        PluginConnector]: CDTParser initialized
[2023-04-01 04:19:26,136 INFO  L432   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem16_label42.c
[2023-04-01 04:19:27,310 INFO  L500              CDTParser]: Created temporary CDT project at NULL
[2023-04-01 04:19:27,627 INFO  L351              CDTParser]: Found 1 translation units.
[2023-04-01 04:19:27,628 INFO  L172              CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem16_label42.c
[2023-04-01 04:19:27,657 INFO  L394              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a0db13a42/846be5df8eb348e6851d1e41b2a3b952/FLAG78fee021f
[2023-04-01 04:19:27,673 INFO  L402              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a0db13a42/846be5df8eb348e6851d1e41b2a3b952
[2023-04-01 04:19:27,675 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2023-04-01 04:19:27,677 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2023-04-01 04:19:27,681 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2023-04-01 04:19:27,681 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2023-04-01 04:19:27,684 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2023-04-01 04:19:27,684 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 04:19:27" (1/1) ...
[2023-04-01 04:19:27,685 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@696fa3d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:27, skipping insertion in model container
[2023-04-01 04:19:27,686 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 04:19:27" (1/1) ...
[2023-04-01 04:19:27,691 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2023-04-01 04:19:27,767 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2023-04-01 04:19:27,983 WARN  L247   ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem16_label42.c[6474,6487]
[2023-04-01 04:19:28,287 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-04-01 04:19:28,303 INFO  L203         MainTranslator]: Completed pre-run
[2023-04-01 04:19:28,337 WARN  L247   ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem16_label42.c[6474,6487]
[2023-04-01 04:19:28,505 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-04-01 04:19:28,523 INFO  L208         MainTranslator]: Completed translation
[2023-04-01 04:19:28,523 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28 WrapperNode
[2023-04-01 04:19:28,523 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2023-04-01 04:19:28,525 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2023-04-01 04:19:28,525 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2023-04-01 04:19:28,525 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2023-04-01 04:19:28,535 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28" (1/1) ...
[2023-04-01 04:19:28,536 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28" (1/1) ...
[2023-04-01 04:19:28,581 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28" (1/1) ...
[2023-04-01 04:19:28,581 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28" (1/1) ...
[2023-04-01 04:19:28,641 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28" (1/1) ...
[2023-04-01 04:19:28,654 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28" (1/1) ...
[2023-04-01 04:19:28,675 INFO  L185        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28" (1/1) ...
[2023-04-01 04:19:28,700 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28" (1/1) ...
[2023-04-01 04:19:28,718 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2023-04-01 04:19:28,719 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2023-04-01 04:19:28,719 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2023-04-01 04:19:28,719 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2023-04-01 04:19:28,720 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28" (1/1) ...
[2023-04-01 04:19:28,726 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-04-01 04:19:28,735 INFO  L189       MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
[2023-04-01 04:19:28,750 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2023-04-01 04:19:28,771 INFO  L327       MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2023-04-01 04:19:28,789 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2023-04-01 04:19:28,789 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2023-04-01 04:19:28,789 INFO  L138     BoogieDeclarations]: Found implementation of procedure reach_error
[2023-04-01 04:19:28,790 INFO  L138     BoogieDeclarations]: Found implementation of procedure calculate_output
[2023-04-01 04:19:28,791 INFO  L138     BoogieDeclarations]: Found implementation of procedure calculate_output2
[2023-04-01 04:19:28,791 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2023-04-01 04:19:28,791 INFO  L130     BoogieDeclarations]: Found specification of procedure calculate_output
[2023-04-01 04:19:28,791 INFO  L130     BoogieDeclarations]: Found specification of procedure calculate_output2
[2023-04-01 04:19:28,791 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2023-04-01 04:19:28,791 INFO  L130     BoogieDeclarations]: Found specification of procedure __assert_fail
[2023-04-01 04:19:28,791 INFO  L130     BoogieDeclarations]: Found specification of procedure reach_error
[2023-04-01 04:19:28,791 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2023-04-01 04:19:28,791 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2023-04-01 04:19:28,792 INFO  L130     BoogieDeclarations]: Found specification of procedure exit
[2023-04-01 04:19:28,792 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2023-04-01 04:19:28,792 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2023-04-01 04:19:28,792 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2023-04-01 04:19:28,792 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2023-04-01 04:19:28,792 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int
[2023-04-01 04:19:28,792 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int
[2023-04-01 04:19:28,792 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2023-04-01 04:19:28,875 INFO  L236             CfgBuilder]: Building ICFG
[2023-04-01 04:19:28,877 INFO  L262             CfgBuilder]: Building CFG for each procedure with an implementation
[2023-04-01 04:19:30,641 INFO  L277             CfgBuilder]: Performing block encoding
[2023-04-01 04:19:31,589 INFO  L297             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2023-04-01 04:19:31,590 INFO  L302             CfgBuilder]: Removed 1 assume(true) statements.
[2023-04-01 04:19:31,594 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 04:19:31 BoogieIcfgContainer
[2023-04-01 04:19:31,594 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2023-04-01 04:19:31,597 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2023-04-01 04:19:31,597 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2023-04-01 04:19:31,599 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2023-04-01 04:19:31,600 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 04:19:27" (1/3) ...
[2023-04-01 04:19:31,600 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d0c76e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 04:19:31, skipping insertion in model container
[2023-04-01 04:19:31,600 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 04:19:28" (2/3) ...
[2023-04-01 04:19:31,601 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d0c76e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 04:19:31, skipping insertion in model container
[2023-04-01 04:19:31,601 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 04:19:31" (3/3) ...
[2023-04-01 04:19:31,602 INFO  L112   eAbstractionObserver]: Analyzing ICFG Problem16_label42.c
[2023-04-01 04:19:31,618 INFO  L203   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2023-04-01 04:19:31,618 INFO  L162   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2023-04-01 04:19:31,713 INFO  L356      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2023-04-01 04:19:31,718 INFO  L357      AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4e5d7fb9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2023-04-01 04:19:31,718 INFO  L358      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2023-04-01 04:19:31,723 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 244 states, 234 states have (on average 1.9572649572649572) internal successors, (458), 235 states have internal predecessors, (458), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4)
[2023-04-01 04:19:31,728 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 12
[2023-04-01 04:19:31,729 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 04:19:31,729 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-04-01 04:19:31,730 INFO  L420      AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 04:19:31,734 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 04:19:31,735 INFO  L85        PathProgramCache]: Analyzing trace with hash -706726231, now seen corresponding path program 1 times
[2023-04-01 04:19:31,746 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 04:19:31,746 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416168184]
[2023-04-01 04:19:31,747 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 04:19:31,747 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 04:19:31,865 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 04:19:32,071 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-04-01 04:19:32,072 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 04:19:32,072 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416168184]
[2023-04-01 04:19:32,073 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1416168184] provided 1 perfect and 0 imperfect interpolant sequences
[2023-04-01 04:19:32,073 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-04-01 04:19:32,074 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-04-01 04:19:32,075 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918027376]
[2023-04-01 04:19:32,076 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-04-01 04:19:32,079 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-04-01 04:19:32,079 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-04-01 04:19:32,113 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-04-01 04:19:32,113 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2023-04-01 04:19:32,117 INFO  L87              Difference]: Start difference. First operand  has 244 states, 234 states have (on average 1.9572649572649572) internal successors, (458), 235 states have internal predecessors, (458), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand  has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)
[2023-04-01 04:19:33,345 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-04-01 04:19:33,346 INFO  L93              Difference]: Finished difference Result 718 states and 1389 transitions.
[2023-04-01 04:19:33,347 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-04-01 04:19:33,349 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11
[2023-04-01 04:19:33,349 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-04-01 04:19:33,376 INFO  L225             Difference]: With dead ends: 718
[2023-04-01 04:19:33,376 INFO  L226             Difference]: Without dead ends: 471
[2023-04-01 04:19:33,386 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2023-04-01 04:19:33,390 INFO  L413           NwaCegarLoop]: 39 mSDtfsCounter, 307 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 661 mSolverCounterSat, 348 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 1009 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 348 IncrementalHoareTripleChecker+Valid, 661 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time
[2023-04-01 04:19:33,391 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [307 Valid, 54 Invalid, 1009 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [348 Valid, 661 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time]
[2023-04-01 04:19:33,411 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 471 states.
[2023-04-01 04:19:33,476 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 462.
[2023-04-01 04:19:33,478 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 462 states, 452 states have (on average 1.915929203539823) internal successors, (866), 452 states have internal predecessors, (866), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6)
[2023-04-01 04:19:33,480 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 877 transitions.
[2023-04-01 04:19:33,482 INFO  L78                 Accepts]: Start accepts. Automaton has 462 states and 877 transitions. Word has length 11
[2023-04-01 04:19:33,482 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-04-01 04:19:33,482 INFO  L495      AbstractCegarLoop]: Abstraction has 462 states and 877 transitions.
[2023-04-01 04:19:33,482 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)
[2023-04-01 04:19:33,483 INFO  L276                IsEmpty]: Start isEmpty. Operand 462 states and 877 transitions.
[2023-04-01 04:19:33,484 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 45
[2023-04-01 04:19:33,484 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 04:19:33,491 INFO  L195           NwaCegarLoop]: trace histogram [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]
[2023-04-01 04:19:33,492 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2023-04-01 04:19:33,492 INFO  L420      AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 04:19:33,493 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 04:19:33,493 INFO  L85        PathProgramCache]: Analyzing trace with hash -1365493340, now seen corresponding path program 1 times
[2023-04-01 04:19:33,493 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 04:19:33,493 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258856140]
[2023-04-01 04:19:33,494 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 04:19:33,494 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 04:19:33,561 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 04:19:33,809 INFO  L134       CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-04-01 04:19:33,809 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 04:19:33,810 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258856140]
[2023-04-01 04:19:33,810 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258856140] provided 1 perfect and 0 imperfect interpolant sequences
[2023-04-01 04:19:33,810 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-04-01 04:19:33,811 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2023-04-01 04:19:33,811 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591292063]
[2023-04-01 04:19:33,811 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-04-01 04:19:33,813 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2023-04-01 04:19:33,813 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-04-01 04:19:33,813 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2023-04-01 04:19:33,814 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2023-04-01 04:19:33,815 INFO  L87              Difference]: Start difference. First operand 462 states and 877 transitions. Second operand  has 5 states, 5 states have (on average 7.6) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-04-01 04:19:35,393 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-04-01 04:19:35,393 INFO  L93              Difference]: Finished difference Result 1390 states and 2669 transitions.
[2023-04-01 04:19:35,393 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2023-04-01 04:19:35,393 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 7.6) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 44
[2023-04-01 04:19:35,394 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-04-01 04:19:35,400 INFO  L225             Difference]: With dead ends: 1390
[2023-04-01 04:19:35,400 INFO  L226             Difference]: Without dead ends: 933
[2023-04-01 04:19:35,401 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56
[2023-04-01 04:19:35,402 INFO  L413           NwaCegarLoop]: 17 mSDtfsCounter, 853 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1251 mSolverCounterSat, 403 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 853 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1654 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 403 IncrementalHoareTripleChecker+Valid, 1251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time
[2023-04-01 04:19:35,403 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [853 Valid, 43 Invalid, 1654 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [403 Valid, 1251 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time]
[2023-04-01 04:19:35,404 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 933 states.
[2023-04-01 04:19:35,441 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 933 to 917.
[2023-04-01 04:19:35,442 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 917 states, 900 states have (on average 1.8311111111111111) internal successors, (1648), 903 states have internal predecessors, (1648), 7 states have call successors, (7), 7 states have call predecessors, (7), 9 states have return successors, (23), 6 states have call predecessors, (23), 6 states have call successors, (23)
[2023-04-01 04:19:35,446 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 917 states to 917 states and 1678 transitions.
[2023-04-01 04:19:35,446 INFO  L78                 Accepts]: Start accepts. Automaton has 917 states and 1678 transitions. Word has length 44
[2023-04-01 04:19:35,447 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-04-01 04:19:35,447 INFO  L495      AbstractCegarLoop]: Abstraction has 917 states and 1678 transitions.
[2023-04-01 04:19:35,447 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 7.6) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-04-01 04:19:35,447 INFO  L276                IsEmpty]: Start isEmpty. Operand 917 states and 1678 transitions.
[2023-04-01 04:19:35,450 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 96
[2023-04-01 04:19:35,450 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 04:19:35,450 INFO  L195           NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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]
[2023-04-01 04:19:35,451 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2023-04-01 04:19:35,451 INFO  L420      AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 04:19:35,451 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 04:19:35,451 INFO  L85        PathProgramCache]: Analyzing trace with hash 1692722445, now seen corresponding path program 1 times
[2023-04-01 04:19:35,452 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 04:19:35,452 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596421739]
[2023-04-01 04:19:35,452 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 04:19:35,452 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 04:19:35,479 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 04:19:35,687 INFO  L134       CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2023-04-01 04:19:35,688 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 04:19:35,688 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596421739]
[2023-04-01 04:19:35,688 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596421739] provided 0 perfect and 1 imperfect interpolant sequences
[2023-04-01 04:19:35,688 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399535812]
[2023-04-01 04:19:35,688 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 04:19:35,689 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-04-01 04:19:35,689 INFO  L189       MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
[2023-04-01 04:19:35,700 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-04-01 04:19:35,728 INFO  L327       MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2023-04-01 04:19:35,822 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 04:19:35,825 INFO  L262         TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 6 conjunts are in the unsatisfiable core
[2023-04-01 04:19:35,831 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-04-01 04:19:36,000 INFO  L134       CoverageAnalysis]: Checked inductivity of 43 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2023-04-01 04:19:36,000 INFO  L323         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2023-04-01 04:19:36,001 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1399535812] provided 1 perfect and 0 imperfect interpolant sequences
[2023-04-01 04:19:36,001 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences.
[2023-04-01 04:19:36,001 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8
[2023-04-01 04:19:36,001 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814685922]
[2023-04-01 04:19:36,001 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-04-01 04:19:36,002 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2023-04-01 04:19:36,002 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-04-01 04:19:36,003 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2023-04-01 04:19:36,003 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56
[2023-04-01 04:19:36,003 INFO  L87              Difference]: Start difference. First operand 917 states and 1678 transitions. Second operand  has 5 states, 5 states have (on average 16.6) internal successors, (83), 4 states have internal predecessors, (83), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3)
[2023-04-01 04:19:37,490 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-04-01 04:19:37,491 INFO  L93              Difference]: Finished difference Result 2749 states and 5075 transitions.
[2023-04-01 04:19:37,491 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2023-04-01 04:19:37,491 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 16.6) internal successors, (83), 4 states have internal predecessors, (83), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 95
[2023-04-01 04:19:37,492 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-04-01 04:19:37,503 INFO  L225             Difference]: With dead ends: 2749
[2023-04-01 04:19:37,504 INFO  L226             Difference]: Without dead ends: 1837
[2023-04-01 04:19:37,506 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72
[2023-04-01 04:19:37,509 INFO  L413           NwaCegarLoop]: 14 mSDtfsCounter, 887 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 1145 mSolverCounterSat, 440 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 887 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 1585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 440 IncrementalHoareTripleChecker+Valid, 1145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time
[2023-04-01 04:19:37,511 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [887 Valid, 37 Invalid, 1585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [440 Valid, 1145 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time]
[2023-04-01 04:19:37,514 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1837 states.
[2023-04-01 04:19:37,559 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1837 to 1168.
[2023-04-01 04:19:37,562 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 1168 states, 1140 states have (on average 1.7456140350877194) internal successors, (1990), 1148 states have internal predecessors, (1990), 10 states have call successors, (10), 10 states have call predecessors, (10), 17 states have return successors, (48), 9 states have call predecessors, (48), 9 states have call successors, (48)
[2023-04-01 04:19:37,567 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1168 states to 1168 states and 2048 transitions.
[2023-04-01 04:19:37,568 INFO  L78                 Accepts]: Start accepts. Automaton has 1168 states and 2048 transitions. Word has length 95
[2023-04-01 04:19:37,569 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-04-01 04:19:37,569 INFO  L495      AbstractCegarLoop]: Abstraction has 1168 states and 2048 transitions.
[2023-04-01 04:19:37,569 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 16.6) internal successors, (83), 4 states have internal predecessors, (83), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3)
[2023-04-01 04:19:37,569 INFO  L276                IsEmpty]: Start isEmpty. Operand 1168 states and 2048 transitions.
[2023-04-01 04:19:37,577 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 152
[2023-04-01 04:19:37,577 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 04:19:37,579 INFO  L195           NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 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]
[2023-04-01 04:19:37,592 INFO  L540       MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0
[2023-04-01 04:19:37,787 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-04-01 04:19:37,789 INFO  L420      AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 04:19:37,789 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 04:19:37,789 INFO  L85        PathProgramCache]: Analyzing trace with hash 1584920917, now seen corresponding path program 1 times
[2023-04-01 04:19:37,790 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 04:19:37,790 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152835097]
[2023-04-01 04:19:37,790 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 04:19:37,790 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 04:19:37,840 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 04:19:38,167 INFO  L134       CoverageAnalysis]: Checked inductivity of 132 backedges. 15 proven. 76 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked.
[2023-04-01 04:19:38,167 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 04:19:38,167 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152835097]
[2023-04-01 04:19:38,167 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152835097] provided 0 perfect and 1 imperfect interpolant sequences
[2023-04-01 04:19:38,170 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181942308]
[2023-04-01 04:19:38,171 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 04:19:38,171 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-04-01 04:19:38,171 INFO  L189       MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
[2023-04-01 04:19:38,172 INFO  L229       MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-04-01 04:19:38,175 INFO  L327       MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2023-04-01 04:19:38,348 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 04:19:38,351 INFO  L262         TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 6 conjunts are in the unsatisfiable core
[2023-04-01 04:19:38,365 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-04-01 04:19:38,491 INFO  L134       CoverageAnalysis]: Checked inductivity of 132 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked.
[2023-04-01 04:19:38,491 INFO  L323         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2023-04-01 04:19:38,492 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1181942308] provided 1 perfect and 0 imperfect interpolant sequences
[2023-04-01 04:19:38,492 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences.
[2023-04-01 04:19:38,492 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8
[2023-04-01 04:19:38,493 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533814735]
[2023-04-01 04:19:38,494 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-04-01 04:19:38,495 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2023-04-01 04:19:38,496 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-04-01 04:19:38,497 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2023-04-01 04:19:38,498 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56
[2023-04-01 04:19:38,498 INFO  L87              Difference]: Start difference. First operand 1168 states and 2048 transitions. Second operand  has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3)
[2023-04-01 04:19:40,011 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-04-01 04:19:40,011 INFO  L93              Difference]: Finished difference Result 2591 states and 4491 transitions.
[2023-04-01 04:19:40,017 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2023-04-01 04:19:40,020 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 151
[2023-04-01 04:19:40,020 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-04-01 04:19:40,028 INFO  L225             Difference]: With dead ends: 2591
[2023-04-01 04:19:40,028 INFO  L226             Difference]: Without dead ends: 1428
[2023-04-01 04:19:40,030 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110
[2023-04-01 04:19:40,031 INFO  L413           NwaCegarLoop]: 17 mSDtfsCounter, 799 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 1131 mSolverCounterSat, 585 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 799 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 1716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 585 IncrementalHoareTripleChecker+Valid, 1131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time
[2023-04-01 04:19:40,032 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [799 Valid, 46 Invalid, 1716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [585 Valid, 1131 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time]
[2023-04-01 04:19:40,036 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1428 states.
[2023-04-01 04:19:40,069 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1428 to 1410.
[2023-04-01 04:19:40,071 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 1410 states, 1374 states have (on average 1.5254730713245996) internal successors, (2096), 1386 states have internal predecessors, (2096), 12 states have call successors, (12), 12 states have call predecessors, (12), 23 states have return successors, (68), 11 states have call predecessors, (68), 11 states have call successors, (68)
[2023-04-01 04:19:40,078 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1410 states to 1410 states and 2176 transitions.
[2023-04-01 04:19:40,078 INFO  L78                 Accepts]: Start accepts. Automaton has 1410 states and 2176 transitions. Word has length 151
[2023-04-01 04:19:40,079 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-04-01 04:19:40,080 INFO  L495      AbstractCegarLoop]: Abstraction has 1410 states and 2176 transitions.
[2023-04-01 04:19:40,080 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3)
[2023-04-01 04:19:40,080 INFO  L276                IsEmpty]: Start isEmpty. Operand 1410 states and 2176 transitions.
[2023-04-01 04:19:40,106 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 222
[2023-04-01 04:19:40,106 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 04:19:40,106 INFO  L195           NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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]
[2023-04-01 04:19:40,118 INFO  L540       MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0
[2023-04-01 04:19:40,313 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3
[2023-04-01 04:19:40,314 INFO  L420      AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 04:19:40,315 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 04:19:40,318 INFO  L85        PathProgramCache]: Analyzing trace with hash -1861989983, now seen corresponding path program 1 times
[2023-04-01 04:19:40,318 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 04:19:40,323 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138591321]
[2023-04-01 04:19:40,323 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 04:19:40,323 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 04:19:40,393 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 04:19:40,723 INFO  L134       CoverageAnalysis]: Checked inductivity of 277 backedges. 82 proven. 82 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked.
[2023-04-01 04:19:40,724 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 04:19:40,724 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138591321]
[2023-04-01 04:19:40,724 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1138591321] provided 0 perfect and 1 imperfect interpolant sequences
[2023-04-01 04:19:40,724 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [858510712]
[2023-04-01 04:19:40,724 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 04:19:40,725 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-04-01 04:19:40,725 INFO  L189       MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
[2023-04-01 04:19:40,726 INFO  L229       MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-04-01 04:19:40,753 INFO  L327       MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2023-04-01 04:19:40,936 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 04:19:40,940 INFO  L262         TraceCheckSpWp]: Trace formula consists of 804 conjuncts, 4 conjunts are in the unsatisfiable core
[2023-04-01 04:19:40,948 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-04-01 04:19:41,045 INFO  L134       CoverageAnalysis]: Checked inductivity of 277 backedges. 230 proven. 2 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked.
[2023-04-01 04:19:41,046 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-04-01 04:19:41,266 INFO  L134       CoverageAnalysis]: Checked inductivity of 277 backedges. 82 proven. 82 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked.
[2023-04-01 04:19:41,267 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [858510712] provided 0 perfect and 2 imperfect interpolant sequences
[2023-04-01 04:19:41,267 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [178601144]
[2023-04-01 04:19:41,293 INFO  L159        IcfgInterpreter]: Started Sifa with 77 locations of interest
[2023-04-01 04:19:41,293 INFO  L166        IcfgInterpreter]: Building call graph
[2023-04-01 04:19:41,296 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2023-04-01 04:19:41,300 INFO  L176        IcfgInterpreter]: Starting interpretation
[2023-04-01 04:19:41,300 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2023-04-01 04:19:41,435 INFO  L197        IcfgInterpreter]: Interpreting procedure main with input of size 46 for LOIs
[2023-04-01 04:19:41,666 WARN  L137   XnfTransformerHelper]: expecting exponential blowup for input size 56
[2023-04-01 04:20:04,602 WARN  L176   XnfTransformerHelper]: Simplifying disjunction of 156980 conjuctions. This might take some time...