./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_1+newton_2_6.i --full-output --architecture 32bit


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


Checking for ERROR reachability
Using default analysis
Version 2329fc70
Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_1+newton_2_6.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) )

 --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8060cb1ce07e11abaa182acb01dfa4175ca7fb1d00421c40b0d3868d7fbf682f
--- Real Ultimate output ---
[0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset.
This is Ultimate 0.2.2-dev-2329fc7
[2022-12-14 09:46:16,910 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2022-12-14 09:46:16,912 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2022-12-14 09:46:16,925 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2022-12-14 09:46:16,925 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2022-12-14 09:46:16,926 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2022-12-14 09:46:16,926 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2022-12-14 09:46:16,927 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2022-12-14 09:46:16,928 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2022-12-14 09:46:16,929 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2022-12-14 09:46:16,929 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2022-12-14 09:46:16,930 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2022-12-14 09:46:16,930 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2022-12-14 09:46:16,931 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2022-12-14 09:46:16,932 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2022-12-14 09:46:16,932 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2022-12-14 09:46:16,933 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2022-12-14 09:46:16,934 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2022-12-14 09:46:16,935 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2022-12-14 09:46:16,936 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2022-12-14 09:46:16,937 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2022-12-14 09:46:16,938 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2022-12-14 09:46:16,939 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2022-12-14 09:46:16,940 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2022-12-14 09:46:16,947 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2022-12-14 09:46:16,948 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2022-12-14 09:46:16,948 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2022-12-14 09:46:16,949 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2022-12-14 09:46:16,949 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2022-12-14 09:46:16,950 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2022-12-14 09:46:16,951 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2022-12-14 09:46:16,951 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2022-12-14 09:46:16,952 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2022-12-14 09:46:16,953 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2022-12-14 09:46:16,954 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2022-12-14 09:46:16,954 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2022-12-14 09:46:16,955 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2022-12-14 09:46:16,955 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2022-12-14 09:46:16,955 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2022-12-14 09:46:16,956 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2022-12-14 09:46:16,956 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2022-12-14 09:46:16,957 INFO  L101        SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf
[2022-12-14 09:46:16,975 INFO  L113        SettingsManager]: Loading preferences was successful
[2022-12-14 09:46:16,975 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2022-12-14 09:46:16,975 INFO  L136        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2022-12-14 09:46:16,976 INFO  L138        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2022-12-14 09:46:16,976 INFO  L136        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2022-12-14 09:46:16,976 INFO  L138        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2022-12-14 09:46:16,976 INFO  L138        SettingsManager]:  * User list type=DISABLED
[2022-12-14 09:46:16,976 INFO  L136        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2022-12-14 09:46:16,977 INFO  L138        SettingsManager]:  * Explicit value domain=true
[2022-12-14 09:46:16,977 INFO  L138        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2022-12-14 09:46:16,977 INFO  L138        SettingsManager]:  * Octagon Domain=false
[2022-12-14 09:46:16,977 INFO  L138        SettingsManager]:  * Abstract domain=CompoundDomain
[2022-12-14 09:46:16,977 INFO  L138        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2022-12-14 09:46:16,977 INFO  L138        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2022-12-14 09:46:16,977 INFO  L138        SettingsManager]:  * Interval Domain=false
[2022-12-14 09:46:16,977 INFO  L136        SettingsManager]: Preferences of Sifa differ from their defaults:
[2022-12-14 09:46:16,977 INFO  L138        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2022-12-14 09:46:16,978 INFO  L138        SettingsManager]:  * Simplification Technique=POLY_PAC
[2022-12-14 09:46:16,978 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2022-12-14 09:46:16,978 INFO  L138        SettingsManager]:  * sizeof long=4
[2022-12-14 09:46:16,978 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2022-12-14 09:46:16,979 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2022-12-14 09:46:16,979 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2022-12-14 09:46:16,979 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2022-12-14 09:46:16,979 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2022-12-14 09:46:16,979 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2022-12-14 09:46:16,979 INFO  L138        SettingsManager]:  * sizeof long double=12
[2022-12-14 09:46:16,979 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2022-12-14 09:46:16,979 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2022-12-14 09:46:16,979 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2022-12-14 09:46:16,980 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2022-12-14 09:46:16,980 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2022-12-14 09:46:16,980 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2022-12-14 09:46:16,980 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2022-12-14 09:46:16,980 INFO  L138        SettingsManager]:  * Abstract interpretation Mode=USE_PREDICATES
[2022-12-14 09:46:16,980 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2022-12-14 09:46:16,980 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2022-12-14 09:46:16,980 INFO  L138        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2022-12-14 09:46:16,980 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2022-12-14 09:46:16,981 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2022-12-14 09:46:16,981 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2022-12-14 09:46:16,981 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int)
WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) )


Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8060cb1ce07e11abaa182acb01dfa4175ca7fb1d00421c40b0d3868d7fbf682f
[2022-12-14 09:46:17,140 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2022-12-14 09:46:17,157 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2022-12-14 09:46:17,160 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2022-12-14 09:46:17,160 INFO  L271        PluginConnector]: Initializing CDTParser...
[2022-12-14 09:46:17,161 INFO  L275        PluginConnector]: CDTParser initialized
[2022-12-14 09:46:17,162 INFO  L432   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/combinations/gcd_1+newton_2_6.i
[2022-12-14 09:46:19,770 INFO  L500              CDTParser]: Created temporary CDT project at NULL
[2022-12-14 09:46:19,886 INFO  L351              CDTParser]: Found 1 translation units.
[2022-12-14 09:46:19,886 INFO  L172              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/sv-benchmarks/c/combinations/gcd_1+newton_2_6.i
[2022-12-14 09:46:19,891 INFO  L394              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/data/1323dede4/acfb4e3bd68f4aef907306df40343d6b/FLAG4f14a3490
[2022-12-14 09:46:19,902 INFO  L402              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/data/1323dede4/acfb4e3bd68f4aef907306df40343d6b
[2022-12-14 09:46:19,904 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2022-12-14 09:46:19,905 INFO  L131        ToolchainWalker]: Walking toolchain with 6 elements.
[2022-12-14 09:46:19,906 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2022-12-14 09:46:19,906 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2022-12-14 09:46:19,909 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2022-12-14 09:46:19,909 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 09:46:19" (1/1) ...
[2022-12-14 09:46:19,910 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7bf6b888 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:19, skipping insertion in model container
[2022-12-14 09:46:19,910 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 09:46:19" (1/1) ...
[2022-12-14 09:46:19,916 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2022-12-14 09:46:19,929 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2022-12-14 09:46:20,033 WARN  L237   ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/sv-benchmarks/c/combinations/gcd_1+newton_2_6.i[1226,1239]
[2022-12-14 09:46:20,049 WARN  L237   ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/sv-benchmarks/c/combinations/gcd_1+newton_2_6.i[2807,2820]
[2022-12-14 09:46:20,050 INFO  L210          PostProcessor]: Analyzing one entry point: main
[2022-12-14 09:46:20,057 INFO  L203         MainTranslator]: Completed pre-run
[2022-12-14 09:46:20,066 WARN  L237   ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/sv-benchmarks/c/combinations/gcd_1+newton_2_6.i[1226,1239]
[2022-12-14 09:46:20,072 WARN  L237   ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/sv-benchmarks/c/combinations/gcd_1+newton_2_6.i[2807,2820]
[2022-12-14 09:46:20,073 INFO  L210          PostProcessor]: Analyzing one entry point: main
[2022-12-14 09:46:20,083 INFO  L208         MainTranslator]: Completed translation
[2022-12-14 09:46:20,083 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20 WrapperNode
[2022-12-14 09:46:20,083 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2022-12-14 09:46:20,084 INFO  L113        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2022-12-14 09:46:20,084 INFO  L271        PluginConnector]: Initializing Boogie Procedure Inliner...
[2022-12-14 09:46:20,084 INFO  L275        PluginConnector]: Boogie Procedure Inliner initialized
[2022-12-14 09:46:20,089 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,095 INFO  L185        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,110 INFO  L138                Inliner]: procedures = 27, calls = 24, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 85
[2022-12-14 09:46:20,110 INFO  L132        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2022-12-14 09:46:20,111 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2022-12-14 09:46:20,111 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2022-12-14 09:46:20,111 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2022-12-14 09:46:20,118 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,118 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,119 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,119 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,123 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,126 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,126 INFO  L185        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,127 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,129 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2022-12-14 09:46:20,129 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2022-12-14 09:46:20,129 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2022-12-14 09:46:20,130 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2022-12-14 09:46:20,130 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (1/1) ...
[2022-12-14 09:46:20,135 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2022-12-14 09:46:20,142 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3
[2022-12-14 09:46:20,153 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2022-12-14 09:46:20,155 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2022-12-14 09:46:20,189 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2022-12-14 09:46:20,190 INFO  L130     BoogieDeclarations]: Found specification of procedure fp
[2022-12-14 09:46:20,190 INFO  L138     BoogieDeclarations]: Found implementation of procedure fp
[2022-12-14 09:46:20,190 INFO  L130     BoogieDeclarations]: Found specification of procedure f
[2022-12-14 09:46:20,190 INFO  L138     BoogieDeclarations]: Found implementation of procedure f
[2022-12-14 09:46:20,190 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2022-12-14 09:46:20,190 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2022-12-14 09:46:20,190 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2022-12-14 09:46:20,257 INFO  L235             CfgBuilder]: Building ICFG
[2022-12-14 09:46:20,259 INFO  L261             CfgBuilder]: Building CFG for each procedure with an implementation
[2022-12-14 09:46:20,396 INFO  L276             CfgBuilder]: Performing block encoding
[2022-12-14 09:46:20,454 INFO  L295             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2022-12-14 09:46:20,454 INFO  L300             CfgBuilder]: Removed 1 assume(true) statements.
[2022-12-14 09:46:20,457 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 09:46:20 BoogieIcfgContainer
[2022-12-14 09:46:20,457 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2022-12-14 09:46:20,459 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2022-12-14 09:46:20,460 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2022-12-14 09:46:20,463 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2022-12-14 09:46:20,463 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 09:46:19" (1/3) ...
[2022-12-14 09:46:20,464 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1480688f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 09:46:20, skipping insertion in model container
[2022-12-14 09:46:20,464 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:46:20" (2/3) ...
[2022-12-14 09:46:20,464 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1480688f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 09:46:20, skipping insertion in model container
[2022-12-14 09:46:20,464 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 09:46:20" (3/3) ...
[2022-12-14 09:46:20,465 INFO  L112   eAbstractionObserver]: Analyzing ICFG gcd_1+newton_2_6.i
[2022-12-14 09:46:20,484 INFO  L203   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2022-12-14 09:46:20,484 INFO  L162   ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations.
[2022-12-14 09:46:20,527 INFO  L356      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2022-12-14 09:46:20,532 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;@4aa0ec77, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2022-12-14 09:46:20,533 INFO  L358      AbstractCegarLoop]: Starting to check reachability of 2 error locations.
[2022-12-14 09:46:20,536 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 25 states, 16 states have (on average 1.4375) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4)
[2022-12-14 09:46:20,542 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 7
[2022-12-14 09:46:20,542 INFO  L187           NwaCegarLoop]: Found error trace
[2022-12-14 09:46:20,543 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1]
[2022-12-14 09:46:20,543 INFO  L420      AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-12-14 09:46:20,547 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-12-14 09:46:20,548 INFO  L85        PathProgramCache]: Analyzing trace with hash -592026431, now seen corresponding path program 1 times
[2022-12-14 09:46:20,555 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2022-12-14 09:46:20,555 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678163319]
[2022-12-14 09:46:20,555 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-12-14 09:46:20,555 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-12-14 09:46:20,631 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-12-14 09:46:20,631 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1949937538]
[2022-12-14 09:46:20,631 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-12-14 09:46:20,632 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-12-14 09:46:20,632 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3
[2022-12-14 09:46:20,633 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-12-14 09:46:20,634 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2022-12-14 09:46:20,702 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-12-14 09:46:20,704 INFO  L263         TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 6 conjunts are in the unsatisfiable core
[2022-12-14 09:46:20,708 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-12-14 09:46:20,780 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2022-12-14 09:46:20,780 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2022-12-14 09:46:20,781 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2022-12-14 09:46:20,781 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678163319]
[2022-12-14 09:46:20,781 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-12-14 09:46:20,782 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949937538]
[2022-12-14 09:46:20,782 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949937538] provided 1 perfect and 0 imperfect interpolant sequences
[2022-12-14 09:46:20,782 INFO  L184   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2022-12-14 09:46:20,782 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2022-12-14 09:46:20,784 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562612216]
[2022-12-14 09:46:20,784 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2022-12-14 09:46:20,788 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2022-12-14 09:46:20,788 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2022-12-14 09:46:20,810 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2022-12-14 09:46:20,810 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2022-12-14 09:46:20,812 INFO  L87              Difference]: Start difference. First operand  has 25 states, 16 states have (on average 1.4375) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 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 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2022-12-14 09:46:20,852 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-12-14 09:46:20,852 INFO  L93              Difference]: Finished difference Result 34 states and 41 transitions.
[2022-12-14 09:46:20,853 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2022-12-14 09:46:20,854 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6
[2022-12-14 09:46:20,854 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-12-14 09:46:20,859 INFO  L225             Difference]: With dead ends: 34
[2022-12-14 09:46:20,859 INFO  L226             Difference]: Without dead ends: 21
[2022-12-14 09:46:20,861 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
[2022-12-14 09:46:20,863 INFO  L413           NwaCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time
[2022-12-14 09:46:20,864 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time]
[2022-12-14 09:46:20,877 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 21 states.
[2022-12-14 09:46:20,888 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21.
[2022-12-14 09:46:20,889 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 21 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4)
[2022-12-14 09:46:20,890 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions.
[2022-12-14 09:46:20,891 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6
[2022-12-14 09:46:20,891 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-12-14 09:46:20,891 INFO  L495      AbstractCegarLoop]: Abstraction has 21 states and 23 transitions.
[2022-12-14 09:46:20,891 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2022-12-14 09:46:20,891 INFO  L276                IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions.
[2022-12-14 09:46:20,892 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 8
[2022-12-14 09:46:20,892 INFO  L187           NwaCegarLoop]: Found error trace
[2022-12-14 09:46:20,892 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1]
[2022-12-14 09:46:20,898 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0
[2022-12-14 09:46:21,093 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0
[2022-12-14 09:46:21,095 INFO  L420      AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-12-14 09:46:21,097 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-12-14 09:46:21,097 INFO  L85        PathProgramCache]: Analyzing trace with hash -1175005777, now seen corresponding path program 1 times
[2022-12-14 09:46:21,098 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2022-12-14 09:46:21,099 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737587463]
[2022-12-14 09:46:21,099 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-12-14 09:46:21,100 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-12-14 09:46:21,136 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-12-14 09:46:21,137 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1266656317]
[2022-12-14 09:46:21,137 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-12-14 09:46:21,138 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-12-14 09:46:21,139 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3
[2022-12-14 09:46:21,142 INFO  L229       MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-12-14 09:46:21,145 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2022-12-14 09:46:21,281 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-12-14 09:46:21,282 INFO  L263         TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 18 conjunts are in the unsatisfiable core
[2022-12-14 09:46:21,284 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-12-14 09:46:21,341 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2022-12-14 09:46:21,341 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-12-14 09:46:21,370 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2022-12-14 09:46:21,370 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2022-12-14 09:46:21,370 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737587463]
[2022-12-14 09:46:21,370 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-12-14 09:46:21,371 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266656317]
[2022-12-14 09:46:21,371 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266656317] provided 0 perfect and 2 imperfect interpolant sequences
[2022-12-14 09:46:21,371 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1355584682]
[2022-12-14 09:46:21,384 INFO  L159        IcfgInterpreter]: Started Sifa with 7 locations of interest
[2022-12-14 09:46:21,384 INFO  L166        IcfgInterpreter]: Building call graph
[2022-12-14 09:46:21,387 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2022-12-14 09:46:21,391 INFO  L176        IcfgInterpreter]: Starting interpretation
[2022-12-14 09:46:21,392 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2022-12-14 09:46:21,551 INFO  L180        IcfgInterpreter]: Interpretation finished
[2022-12-14 09:46:21,800 INFO  L133             SifaRunner]: Sifa could not show that error location is unreachable, found '167#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~y~0#1|) 1 0)) (<= 0 (+ |ULTIMATE.start_gcd_test_#res#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (<= |ULTIMATE.start_main1_~x~0#1| 127) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (<= 0 |ULTIMATE.start_main1_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (<= |ULTIMATE.start_gcd_test_#res#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|) (<= |ULTIMATE.start_main1_~y~0#1| 127) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location
[2022-12-14 09:46:21,800 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED
[2022-12-14 09:46:21,800 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences.
[2022-12-14 09:46:21,800 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8
[2022-12-14 09:46:21,800 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969993288]
[2022-12-14 09:46:21,800 INFO  L85    oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton
[2022-12-14 09:46:21,801 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 8 states
[2022-12-14 09:46:21,801 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2022-12-14 09:46:21,801 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2022-12-14 09:46:21,801 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156
[2022-12-14 09:46:21,801 INFO  L87              Difference]: Start difference. First operand 21 states and 23 transitions. Second operand  has 8 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2022-12-14 09:46:21,843 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-12-14 09:46:21,844 INFO  L93              Difference]: Finished difference Result 25 states and 27 transitions.
[2022-12-14 09:46:21,844 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2022-12-14 09:46:21,844 INFO  L78                 Accepts]: Start accepts. Automaton has  has 8 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7
[2022-12-14 09:46:21,844 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-12-14 09:46:21,845 INFO  L225             Difference]: With dead ends: 25
[2022-12-14 09:46:21,845 INFO  L226             Difference]: Without dead ends: 22
[2022-12-14 09:46:21,845 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182
[2022-12-14 09:46:21,846 INFO  L413           NwaCegarLoop]: 15 mSDtfsCounter, 2 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time
[2022-12-14 09:46:21,847 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 57 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time]
[2022-12-14 09:46:21,848 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2022-12-14 09:46:21,850 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22.
[2022-12-14 09:46:21,851 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 22 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4)
[2022-12-14 09:46:21,851 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions.
[2022-12-14 09:46:21,851 INFO  L78                 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 7
[2022-12-14 09:46:21,852 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-12-14 09:46:21,852 INFO  L495      AbstractCegarLoop]: Abstraction has 22 states and 24 transitions.
[2022-12-14 09:46:21,852 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 8 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2022-12-14 09:46:21,852 INFO  L276                IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions.
[2022-12-14 09:46:21,852 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2022-12-14 09:46:21,852 INFO  L187           NwaCegarLoop]: Found error trace
[2022-12-14 09:46:21,853 INFO  L195           NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1]
[2022-12-14 09:46:21,858 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0
[2022-12-14 09:46:22,053 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-12-14 09:46:22,055 INFO  L420      AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-12-14 09:46:22,056 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-12-14 09:46:22,056 INFO  L85        PathProgramCache]: Analyzing trace with hash -2067496319, now seen corresponding path program 2 times
[2022-12-14 09:46:22,057 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2022-12-14 09:46:22,057 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917151867]
[2022-12-14 09:46:22,058 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-12-14 09:46:22,058 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-12-14 09:46:22,085 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-12-14 09:46:22,086 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2144054919]
[2022-12-14 09:46:22,086 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2022-12-14 09:46:22,087 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-12-14 09:46:22,087 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3
[2022-12-14 09:46:22,091 INFO  L229       MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-12-14 09:46:22,094 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2022-12-14 09:46:33,051 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s)
[2022-12-14 09:46:33,051 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2022-12-14 09:46:33,056 INFO  L263         TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 40 conjunts are in the unsatisfiable core
[2022-12-14 09:46:33,058 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-12-14 09:47:08,401 WARN  L233               SmtUtils]: Spent 7.20s on a formula simplification. DAG size of input: 47 DAG size of output: 25 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)
[2022-12-14 09:47:30,039 WARN  L837   $PredicateComparison]: unable to prove that (and (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |c_ULTIMATE.start_main1_~y~0#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| .cse0) 256) |c_ULTIMATE.start_gcd_test_~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (= 0 .cse0)) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse0))))) is different from false
[2022-12-14 09:48:01,599 WARN  L837   $PredicateComparison]: unable to prove that (and (exists ((|ULTIMATE.start_main1_~y~0#1| Int) (|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |ULTIMATE.start_main1_~y~0#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |ULTIMATE.start_main1_~y~0#1|) 0) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (= (mod (mod |ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0) (not (= .cse0 0))))) (= |c_ULTIMATE.start___VERIFIER_assert_~cond#1| 0)) is different from false
[2022-12-14 09:48:21,798 WARN  L837   $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~y~0#1| Int) (|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |ULTIMATE.start_main1_~y~0#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |ULTIMATE.start_main1_~y~0#1|) 0) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (= (mod (mod |ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0) (not (= .cse0 0))))) is different from false
[2022-12-14 09:48:23,800 WARN  L859   $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~y~0#1| Int) (|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |ULTIMATE.start_main1_~y~0#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |ULTIMATE.start_main1_~y~0#1|) 0) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (= (mod (mod |ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0) (not (= .cse0 0))))) is different from true
[2022-12-14 09:48:23,801 INFO  L134       CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked.
[2022-12-14 09:48:23,801 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-12-14 09:52:17,740 WARN  L233               SmtUtils]: Spent 2.86m on a formula simplification that was a NOOP. DAG size: 124 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)
[2022-12-14 09:52:41,668 WARN  L859   $PredicateComparison]: unable to prove that (or (not (= (mod |c_ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)) (let ((.cse2 (mod (* 255 |c_ULTIMATE.start_main1_~x~0#1|) 256))) (let ((.cse3 (<= .cse2 127))) (and (or (let ((.cse1 (mod (+ .cse2 (- 256)) |c_ULTIMATE.start_main1_~y~0#1|))) (let ((.cse0 (not (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| (+ (- 256) (mod (+ .cse1 (* |c_ULTIMATE.start_main1_~y~0#1| 255)) 256))) 256) 0)))) (and (or .cse0 (= .cse1 0)) (or .cse0 (<= (mod .cse1 256) 127))))) .cse3) (let ((.cse4 (mod (mod .cse2 |c_ULTIMATE.start_main1_~y~0#1|) 256))) (or (not .cse3) (not (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| .cse4) 256) 0)) (= .cse4 0)))))) (not (< 0 |c_ULTIMATE.start_main1_~y~0#1|)) (not (< |c_ULTIMATE.start_main1_~x~0#1| 0))) is different from true
[2022-12-14 09:53:28,925 WARN  L837   $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main1_~y~0#1_12| Int) (|v_ULTIMATE.start_main1_~x~0#1_7| Int)) (let ((.cse0 (mod (mod (mod (* 255 |v_ULTIMATE.start_main1_~x~0#1_7|) 256) |v_ULTIMATE.start_main1_~y~0#1_12|) 256))) (or (not (= 0 (mod (mod |v_ULTIMATE.start_main1_~y~0#1_12| .cse0) 256))) (<= 0 |v_ULTIMATE.start_main1_~x~0#1_7|) (< (+ 128 |v_ULTIMATE.start_main1_~x~0#1_7|) 0) (<= |v_ULTIMATE.start_main1_~y~0#1_12| 0) (not (= (mod |v_ULTIMATE.start_main1_~x~0#1_7| |v_ULTIMATE.start_main1_~y~0#1_12|) 0)) (= .cse0 0)))) is different from false
[2022-12-14 09:53:30,927 WARN  L859   $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main1_~y~0#1_12| Int) (|v_ULTIMATE.start_main1_~x~0#1_7| Int)) (let ((.cse0 (mod (mod (mod (* 255 |v_ULTIMATE.start_main1_~x~0#1_7|) 256) |v_ULTIMATE.start_main1_~y~0#1_12|) 256))) (or (not (= 0 (mod (mod |v_ULTIMATE.start_main1_~y~0#1_12| .cse0) 256))) (<= 0 |v_ULTIMATE.start_main1_~x~0#1_7|) (< (+ 128 |v_ULTIMATE.start_main1_~x~0#1_7|) 0) (<= |v_ULTIMATE.start_main1_~y~0#1_12| 0) (not (= (mod |v_ULTIMATE.start_main1_~x~0#1_7| |v_ULTIMATE.start_main1_~y~0#1_12|) 0)) (= .cse0 0)))) is different from true
[2022-12-14 09:53:30,928 INFO  L134       CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked.
[2022-12-14 09:53:30,928 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2022-12-14 09:53:30,928 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917151867]
[2022-12-14 09:53:30,928 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-12-14 09:53:30,928 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144054919]
[2022-12-14 09:53:30,928 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144054919] provided 0 perfect and 2 imperfect interpolant sequences
[2022-12-14 09:53:30,928 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1017354238]
[2022-12-14 09:53:30,930 INFO  L159        IcfgInterpreter]: Started Sifa with 7 locations of interest
[2022-12-14 09:53:30,930 INFO  L166        IcfgInterpreter]: Building call graph
[2022-12-14 09:53:30,930 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2022-12-14 09:53:30,930 INFO  L176        IcfgInterpreter]: Starting interpretation
[2022-12-14 09:53:30,930 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2022-12-14 09:53:30,989 INFO  L180        IcfgInterpreter]: Interpretation finished
[2022-12-14 09:53:46,664 INFO  L133             SifaRunner]: Sifa could not show that error location is unreachable, found '295#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~y~0#1|) 1 0)) (<= 0 (+ |ULTIMATE.start_gcd_test_#res#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (<= |ULTIMATE.start_main1_~x~0#1| 127) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (<= 0 |ULTIMATE.start_main1_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (<= |ULTIMATE.start_gcd_test_#res#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|) (<= |ULTIMATE.start_main1_~y~0#1| 127) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location
[2022-12-14 09:53:46,664 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED
[2022-12-14 09:53:46,664 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences.
[2022-12-14 09:53:46,664 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 14
[2022-12-14 09:53:46,664 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505652846]
[2022-12-14 09:53:46,664 INFO  L85    oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton
[2022-12-14 09:53:46,665 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 14 states
[2022-12-14 09:53:46,665 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2022-12-14 09:53:46,665 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2022-12-14 09:53:46,665 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=136, Unknown=17, NotChecked=140, Total=342
[2022-12-14 09:53:46,665 INFO  L87              Difference]: Start difference. First operand 22 states and 24 transitions. Second operand  has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2022-12-14 09:53:47,824 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers []
[2022-12-14 09:54:49,058 WARN  L233               SmtUtils]: Spent 46.03s on a formula simplification. DAG size of input: 51 DAG size of output: 30 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)
[2022-12-14 09:54:51,330 WARN  L859   $PredicateComparison]: unable to prove that (and (<= |c_ULTIMATE.start_main1_~x~0#1| 127) (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ 128 |c_ULTIMATE.start_main1_~x~0#1|)) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (= |c_ULTIMATE.start_main1_~y~0#1| |c_ULTIMATE.start_gcd_test_~b#1|) (or (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (<= .cse0 127)) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0) (= (+ |c_ULTIMATE.start_gcd_test_~a#1| 256) .cse0)))) (and (<= |c_ULTIMATE.start_gcd_test_~a#1| 127) (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|) (= (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)) (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse1 (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= .cse1 127) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse1))))) (or (let ((.cse34 (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|))) (let ((.cse21 (< |c_ULTIMATE.start_gcd_test_~a#1| 0)) (.cse35 (mod (+ .cse34 |c_ULTIMATE.start_gcd_test_~b#1|) 256)) (.cse36 (mod (+ .cse34 (* |c_ULTIMATE.start_gcd_test_~b#1| 255)) 256))) (let ((.cse20 (mod .cse34 256)) (.cse7 (< |c_ULTIMATE.start_gcd_test_~b#1| 0)) (.cse11 (<= .cse36 127)) (.cse2 (<= .cse35 127)) (.cse27 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse35) 256) 0))) (.cse29 (= .cse35 0)) (.cse30 (= |c_ULTIMATE.start_main1_~y~0#1| .cse35)) (.cse31 (= .cse36 0)) (.cse32 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse36) 256) 0))) (.cse15 (not .cse21)) (.cse33 (= |c_ULTIMATE.start_main1_~y~0#1| .cse36)) (.cse22 (+ |c_ULTIMATE.start_main1_~y~0#1| 256))) (let ((.cse13 (= .cse36 .cse22)) (.cse14 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse36)) 256) 0))) (.cse8 (or .cse31 .cse32 .cse15 .cse33)) (.cse19 (or .cse27 .cse15 .cse29 .cse30)) (.cse5 (not .cse2)) (.cse10 (not .cse11)) (.cse16 (not .cse7)) (.cse17 (= .cse35 .cse22)) (.cse18 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse35)) 256) 0))) (.cse23 (<= .cse20 127))) (and (or (let ((.cse9 (or (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse20)) 256) 0)) .cse21 (= .cse20 .cse22)))) (let ((.cse6 (or .cse16 (and .cse19 .cse9))) (.cse3 (or .cse16 (and .cse9 (or .cse17 .cse18 .cse15))))) (and (or (let ((.cse4 (or .cse7 (and .cse8 .cse9)))) (and (or .cse2 (and .cse3 .cse4)) (or .cse5 (and .cse6 .cse4)))) .cse10) (or .cse11 (let ((.cse12 (or (and .cse9 (or .cse13 .cse14 .cse15)) .cse7))) (and (or .cse5 (and .cse12 .cse6)) (or .cse2 (and .cse12 .cse3)))))))) .cse23) (or (let ((.cse26 (or .cse21 (= |c_ULTIMATE.start_main1_~y~0#1| .cse20) (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse20) 256) 0)) (= .cse20 0))) (.cse28 (= .cse34 0))) (let ((.cse24 (or .cse16 (and .cse26 (or .cse28 .cse17 .cse18 .cse15))))) (and (or .cse11 (let ((.cse25 (or (and .cse26 (or .cse28 .cse13 .cse14 .cse15)) .cse7))) (and (or (and .cse24 .cse25) .cse2) (or (and (or .cse16 (and .cse26 (or .cse27 .cse28 .cse15 .cse29 .cse30))) .cse25) .cse5)))) (or (and (or (and (or (and .cse8 .cse26) .cse7) (or .cse16 (and .cse26 .cse19))) .cse5) (or .cse2 (and (or (and .cse26 (or .cse28 .cse31 .cse32 .cse15 .cse33)) .cse7) .cse24))) .cse10)))) (not .cse23))))))) (= |c_ULTIMATE.start_gcd_test_~b#1| 0))) is different from true
[2022-12-14 09:55:31,079 WARN  L233               SmtUtils]: Spent 31.47s on a formula simplification. DAG size of input: 37 DAG size of output: 31 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)
[2022-12-14 09:55:32,166 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result INVALID. Formula has sorts [Bool, Real, Int], hasArrays=false, hasNonlinArith=true, quantifiers []
[2022-12-14 09:55:34,173 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0]
[2022-12-14 09:55:36,175 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0]
[2022-12-14 09:55:38,178 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0]
[2022-12-14 09:55:40,180 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0]
[2022-12-14 09:55:42,183 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0]
[2022-12-14 09:55:44,186 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0]
[2022-12-14 09:55:46,189 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0]
[2022-12-14 09:55:48,194 WARN  L837   $PredicateComparison]: unable to prove that (and (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |c_ULTIMATE.start_main1_~y~0#1|) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| .cse0) 256) |c_ULTIMATE.start_gcd_test_~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (= 0 .cse0)) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_main1_~y~0#1|) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse0)))) (or (not (= |c_ULTIMATE.start_gcd_test_~b#1| 0)) (not (<= |c_ULTIMATE.start_gcd_test_~a#1| 127)) (= |c_ULTIMATE.start_main1_~y~0#1| |c_ULTIMATE.start_gcd_test_~a#1|) (not (<= 0 (+ |c_ULTIMATE.start_gcd_test_~a#1| 128))))) is different from false
[2022-12-14 09:58:35,116 WARN  L233               SmtUtils]: Spent 2.74m on a formula simplification that was a NOOP. DAG size: 134 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)
[2022-12-14 09:58:37,644 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Real, Int], hasArrays=false, hasNonlinArith=true, quantifiers []
[2022-12-14 09:58:37,660 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-12-14 09:58:37,660 INFO  L93              Difference]: Finished difference Result 26 states and 28 transitions.
[2022-12-14 09:58:37,661 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2022-12-14 09:58:37,661 INFO  L78                 Accepts]: Start accepts. Automaton has  has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8
[2022-12-14 09:58:37,662 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-12-14 09:58:37,662 INFO  L225             Difference]: With dead ends: 26
[2022-12-14 09:58:37,662 INFO  L226             Difference]: Without dead ends: 23
[2022-12-14 09:58:37,662 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 7 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 500.0s TimeCoverageRelationStatistics Valid=67, Invalid=204, Unknown=29, NotChecked=252, Total=552
[2022-12-14 09:58:37,663 INFO  L413           NwaCegarLoop]: 15 mSDtfsCounter, 5 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 91 IncrementalHoareTripleChecker+Unchecked, 18.9s IncrementalHoareTripleChecker+Time
[2022-12-14 09:58:37,663 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 107 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 8 Unknown, 91 Unchecked, 18.9s Time]
[2022-12-14 09:58:37,663 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 23 states.
[2022-12-14 09:58:37,666 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23.
[2022-12-14 09:58:37,667 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4)
[2022-12-14 09:58:37,667 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions.
[2022-12-14 09:58:37,667 INFO  L78                 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 8
[2022-12-14 09:58:37,667 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-12-14 09:58:37,667 INFO  L495      AbstractCegarLoop]: Abstraction has 23 states and 25 transitions.
[2022-12-14 09:58:37,668 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2022-12-14 09:58:37,668 INFO  L276                IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions.
[2022-12-14 09:58:37,668 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 10
[2022-12-14 09:58:37,668 INFO  L187           NwaCegarLoop]: Found error trace
[2022-12-14 09:58:37,668 INFO  L195           NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1]
[2022-12-14 09:58:37,675 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0
[2022-12-14 09:58:37,868 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-12-14 09:58:37,869 INFO  L420      AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-12-14 09:58:37,870 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-12-14 09:58:37,870 INFO  L85        PathProgramCache]: Analyzing trace with hash 330067951, now seen corresponding path program 3 times
[2022-12-14 09:58:37,871 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2022-12-14 09:58:37,871 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842108432]
[2022-12-14 09:58:37,871 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-12-14 09:58:37,872 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-12-14 09:58:37,880 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-12-14 09:58:37,880 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1876440067]
[2022-12-14 09:58:37,880 INFO  L93    rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST
[2022-12-14 09:58:37,880 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-12-14 09:58:37,880 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3
[2022-12-14 09:58:37,881 INFO  L229       MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-12-14 09:58:37,882 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab16c805-d9f4-4009-bc29-9dbbd9b476f5/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process
[2022-12-14 09:58:45,734 INFO  L228   tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s)
[2022-12-14 09:58:45,735 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2022-12-14 09:58:45,738 INFO  L263         TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 31 conjunts are in the unsatisfiable core
[2022-12-14 09:58:45,739 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-12-14 09:58:58,199 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2022-12-14 09:58:58,199 INFO  L328         TraceCheckSpWp]: Computing backward predicates...