./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_1+newton_2_4.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_1+newton_2_4.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI --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 c4ab638d88884b11d280586d03327428928a19b8179f4a6f29c31c8f46b59f77 --- 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-5e519f3 [2022-11-03 04:08:56,867 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 04:08:56,870 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 04:08:56,920 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 04:08:56,921 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 04:08:56,926 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 04:08:56,928 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 04:08:56,931 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 04:08:56,933 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 04:08:56,938 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 04:08:56,939 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 04:08:56,942 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 04:08:56,942 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 04:08:56,945 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 04:08:56,947 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 04:08:56,948 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 04:08:56,951 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 04:08:56,952 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 04:08:56,953 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 04:08:56,961 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 04:08:56,963 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 04:08:56,964 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 04:08:56,968 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 04:08:56,969 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 04:08:56,979 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 04:08:56,979 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 04:08:56,980 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 04:08:56,984 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 04:08:56,985 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 04:08:56,986 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 04:08:56,987 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 04:08:56,988 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 04:08:56,992 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 04:08:56,994 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 04:08:56,995 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 04:08:56,995 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 04:08:56,996 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 04:08:56,996 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 04:08:56,996 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 04:08:56,997 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 04:08:56,998 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 04:08:56,999 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 04:08:57,044 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 04:08:57,045 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 04:08:57,045 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 04:08:57,046 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 04:08:57,047 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 04:08:57,047 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 04:08:57,047 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 04:08:57,048 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 04:08:57,048 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 04:08:57,048 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 04:08:57,050 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 04:08:57,050 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 04:08:57,050 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 04:08:57,051 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 04:08:57,051 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 04:08:57,051 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 04:08:57,051 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 04:08:57,052 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 04:08:57,053 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 04:08:57,053 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 04:08:57,053 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 04:08:57,053 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 04:08:57,054 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 04:08:57,055 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 04:08:57,056 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 04:08:57,056 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 04:08:57,056 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 04:08:57,057 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 04:08:57,057 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 04:08:57,057 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 04:08:57,058 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 04:08:57,058 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 04:08:57,058 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 04:08:57,059 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 04:08:57,059 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 04:08:57,059 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 04:08:57,060 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 04:08:57,060 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 04:08:57,060 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 04:08:57,060 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 04:08:57,061 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 04:08:57,061 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_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c4ab638d88884b11d280586d03327428928a19b8179f4a6f29c31c8f46b59f77 [2022-11-03 04:08:57,451 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 04:08:57,490 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 04:08:57,493 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 04:08:57,495 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 04:08:57,496 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 04:08:57,497 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/combinations/gcd_1+newton_2_4.i [2022-11-03 04:08:57,569 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/data/5f14b76a9/fbe0bc150d694ea7a8df63aeef5f5b5c/FLAGc1bc80c94 [2022-11-03 04:08:58,090 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 04:08:58,103 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/sv-benchmarks/c/combinations/gcd_1+newton_2_4.i [2022-11-03 04:08:58,114 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/data/5f14b76a9/fbe0bc150d694ea7a8df63aeef5f5b5c/FLAGc1bc80c94 [2022-11-03 04:08:58,477 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/data/5f14b76a9/fbe0bc150d694ea7a8df63aeef5f5b5c [2022-11-03 04:08:58,483 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 04:08:58,485 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 04:08:58,491 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 04:08:58,491 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 04:08:58,496 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 04:08:58,497 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,500 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ba31807 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58, skipping insertion in model container [2022-11-03 04:08:58,501 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,510 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 04:08:58,541 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 04:08:58,815 WARN L230 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_03ab221b-8c1a-429f-86ec-17847d03fea5/sv-benchmarks/c/combinations/gcd_1+newton_2_4.i[1226,1239] [2022-11-03 04:08:58,866 WARN L230 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_03ab221b-8c1a-429f-86ec-17847d03fea5/sv-benchmarks/c/combinations/gcd_1+newton_2_4.i[2807,2820] [2022-11-03 04:08:58,867 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 04:08:58,876 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 04:08:58,889 WARN L230 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_03ab221b-8c1a-429f-86ec-17847d03fea5/sv-benchmarks/c/combinations/gcd_1+newton_2_4.i[1226,1239] [2022-11-03 04:08:58,900 WARN L230 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_03ab221b-8c1a-429f-86ec-17847d03fea5/sv-benchmarks/c/combinations/gcd_1+newton_2_4.i[2807,2820] [2022-11-03 04:08:58,902 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 04:08:58,916 INFO L208 MainTranslator]: Completed translation [2022-11-03 04:08:58,916 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58 WrapperNode [2022-11-03 04:08:58,917 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 04:08:58,918 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 04:08:58,918 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 04:08:58,918 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 04:08:58,926 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,934 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,955 INFO L138 Inliner]: procedures = 27, calls = 16, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 77 [2022-11-03 04:08:58,956 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 04:08:58,957 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 04:08:58,957 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 04:08:58,957 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 04:08:58,966 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,966 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,968 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,969 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,974 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,978 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,979 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,980 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,983 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 04:08:58,984 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 04:08:58,984 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 04:08:58,984 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 04:08:58,985 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (1/1) ... [2022-11-03 04:08:58,994 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 04:08:59,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:08:59,036 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 04:08:59,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 04:08:59,085 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 04:08:59,085 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2022-11-03 04:08:59,085 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2022-11-03 04:08:59,086 INFO L130 BoogieDeclarations]: Found specification of procedure f [2022-11-03 04:08:59,086 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2022-11-03 04:08:59,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 04:08:59,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 04:08:59,087 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 04:08:59,187 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 04:08:59,191 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 04:08:59,409 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 04:08:59,470 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 04:08:59,470 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-03 04:08:59,473 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:08:59 BoogieIcfgContainer [2022-11-03 04:08:59,473 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 04:08:59,475 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 04:08:59,476 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 04:08:59,480 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 04:08:59,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:08:58" (1/3) ... [2022-11-03 04:08:59,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@610df104 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:08:59, skipping insertion in model container [2022-11-03 04:08:59,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:58" (2/3) ... [2022-11-03 04:08:59,482 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@610df104 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:08:59, skipping insertion in model container [2022-11-03 04:08:59,482 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:08:59" (3/3) ... [2022-11-03 04:08:59,484 INFO L112 eAbstractionObserver]: Analyzing ICFG gcd_1+newton_2_4.i [2022-11-03 04:08:59,505 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 04:08:59,506 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-03 04:08:59,559 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 04:08:59,567 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;@14ff724b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 04:08:59,567 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-03 04:08:59,572 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) [2022-11-03 04:08:59,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 04:08:59,579 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:08:59,580 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 04:08:59,581 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:08:59,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:08:59,587 INFO L85 PathProgramCache]: Analyzing trace with hash -592026431, now seen corresponding path program 1 times [2022-11-03 04:08:59,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:08:59,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208926867] [2022-11-03 04:08:59,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:08:59,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:08:59,722 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 04:08:59,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [176452055] [2022-11-03 04:08:59,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:08:59,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:08:59,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:08:59,730 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:08:59,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 04:08:59,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:08:59,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 04:08:59,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:09:00,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:09:00,034 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 04:09:00,034 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:09:00,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208926867] [2022-11-03 04:09:00,035 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 04:09:00,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176452055] [2022-11-03 04:09:00,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [176452055] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 04:09:00,036 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 04:09:00,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 04:09:00,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271669104] [2022-11-03 04:09:00,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 04:09:00,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 04:09:00,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:09:00,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 04:09:00,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 04:09:00,129 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) [2022-11-03 04:09:00,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:09:00,186 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2022-11-03 04:09:00,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 04:09:00,189 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 [2022-11-03 04:09:00,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:09:00,197 INFO L225 Difference]: With dead ends: 34 [2022-11-03 04:09:00,197 INFO L226 Difference]: Without dead ends: 21 [2022-11-03 04:09:00,200 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 [2022-11-03 04:09:00,204 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 26 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 [2022-11-03 04:09:00,205 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] [2022-11-03 04:09:00,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-03 04:09:00,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-03 04:09:00,241 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) [2022-11-03 04:09:00,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-11-03 04:09:00,243 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2022-11-03 04:09:00,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:09:00,244 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-11-03 04:09:00,244 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) [2022-11-03 04:09:00,244 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-11-03 04:09:00,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-03 04:09:00,246 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:09:00,246 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:09:00,276 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-03 04:09:00,462 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-03 04:09:00,463 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:09:00,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:09:00,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1175005777, now seen corresponding path program 1 times [2022-11-03 04:09:00,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:09:00,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108632576] [2022-11-03 04:09:00,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:09:00,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:09:00,479 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 04:09:00,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [785625562] [2022-11-03 04:09:00,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:09:00,480 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:09:00,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:09:00,482 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:09:00,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 04:09:00,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:09:00,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 04:09:00,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:09:00,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:09:00,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:09:00,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 04:09:00,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:09:00,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108632576] [2022-11-03 04:09:00,730 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 04:09:00,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785625562] [2022-11-03 04:09:00,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785625562] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:09:00,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2120184711] [2022-11-03 04:09:00,754 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-03 04:09:00,755 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:09:00,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:09:00,764 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:09:00,765 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:09:01,104 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:09:01,478 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '166#(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 [2022-11-03 04:09:01,479 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:09:01,479 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 04:09:01,480 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2022-11-03 04:09:01,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502599249] [2022-11-03 04:09:01,480 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 04:09:01,481 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 04:09:01,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:09:01,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 04:09:01,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2022-11-03 04:09:01,483 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 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) [2022-11-03 04:09:01,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:09:01,589 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-11-03 04:09:01,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 04:09:01,590 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 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 [2022-11-03 04:09:01,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:09:01,591 INFO L225 Difference]: With dead ends: 25 [2022-11-03 04:09:01,591 INFO L226 Difference]: Without dead ends: 22 [2022-11-03 04:09:01,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-11-03 04:09:01,601 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 1 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:09:01,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 85 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 04:09:01,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-03 04:09:01,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-03 04:09:01,614 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) [2022-11-03 04:09:01,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-11-03 04:09:01,615 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 7 [2022-11-03 04:09:01,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:09:01,615 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-11-03 04:09:01,615 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 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) [2022-11-03 04:09:01,615 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-11-03 04:09:01,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-03 04:09:01,616 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:09:01,616 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2022-11-03 04:09:01,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 04:09:01,838 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:09:01,839 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:09:01,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:09:01,840 INFO L85 PathProgramCache]: Analyzing trace with hash -2067496319, now seen corresponding path program 2 times [2022-11-03 04:09:01,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:09:01,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511622123] [2022-11-03 04:09:01,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:09:01,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:09:01,851 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 04:09:01,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1689384316] [2022-11-03 04:09:01,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 04:09:01,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:09:01,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:09:01,853 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:09:01,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 04:09:13,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 04:09:13,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:09:14,001 WARN L261 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-03 04:09:14,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:09:38,811 WARN L234 SmtUtils]: Spent 8.59s on a formula simplification that was a NOOP. DAG size: 35 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 04:10:03,998 WARN L234 SmtUtils]: Spent 12.89s on a formula simplification. DAG size of input: 47 DAG size of output: 25 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 04:10:25,651 WARN L833 $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 [2022-11-03 04:10:54,292 WARN L833 $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))))) (<= 0 |c_ULTIMATE.start___VERIFIER_assert_~cond#1|)) is different from false [2022-11-03 04:11:12,942 WARN L833 $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 [2022-11-03 04:11:14,946 WARN L855 $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 [2022-11-03 04:11:14,947 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2022-11-03 04:11:14,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:11:49,963 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse32 (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|))) (let ((.cse19 (< |c_ULTIMATE.start_gcd_test_~a#1| 0)) (.cse33 (mod (+ .cse32 |c_ULTIMATE.start_gcd_test_~b#1|) 256)) (.cse34 (mod (+ .cse32 (* |c_ULTIMATE.start_gcd_test_~b#1| 255)) 256))) (let ((.cse18 (mod .cse32 256)) (.cse5 (< |c_ULTIMATE.start_gcd_test_~b#1| 0)) (.cse9 (<= .cse34 127)) (.cse0 (<= .cse33 127)) (.cse25 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse33) 256) 0))) (.cse27 (= .cse33 0)) (.cse28 (= |c_ULTIMATE.start_main1_~y~0#1| .cse33)) (.cse29 (= .cse34 0)) (.cse30 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse34) 256) 0))) (.cse13 (not .cse19)) (.cse31 (= |c_ULTIMATE.start_main1_~y~0#1| .cse34)) (.cse20 (+ |c_ULTIMATE.start_main1_~y~0#1| 256))) (let ((.cse11 (= .cse34 .cse20)) (.cse12 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse34)) 256) 0))) (.cse6 (or .cse29 .cse30 .cse13 .cse31)) (.cse17 (or .cse25 .cse13 .cse27 .cse28)) (.cse3 (not .cse0)) (.cse8 (not .cse9)) (.cse14 (not .cse5)) (.cse15 (= .cse33 .cse20)) (.cse16 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse33)) 256) 0))) (.cse21 (<= .cse18 127))) (and (or (let ((.cse7 (or (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse18)) 256) 0)) .cse19 (= .cse18 .cse20)))) (let ((.cse4 (or .cse14 (and .cse17 .cse7))) (.cse1 (or .cse14 (and .cse7 (or .cse15 .cse16 .cse13))))) (and (or (let ((.cse2 (or .cse5 (and .cse6 .cse7)))) (and (or .cse0 (and .cse1 .cse2)) (or .cse3 (and .cse4 .cse2)))) .cse8) (or .cse9 (let ((.cse10 (or (and .cse7 (or .cse11 .cse12 .cse13)) .cse5))) (and (or .cse3 (and .cse10 .cse4)) (or .cse0 (and .cse10 .cse1)))))))) .cse21) (or (let ((.cse24 (or .cse19 (= |c_ULTIMATE.start_main1_~y~0#1| .cse18) (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse18) 256) 0)) (= .cse18 0))) (.cse26 (= .cse32 0))) (let ((.cse22 (or .cse14 (and .cse24 (or .cse26 .cse15 .cse16 .cse13))))) (and (or .cse9 (let ((.cse23 (or (and .cse24 (or .cse26 .cse11 .cse12 .cse13)) .cse5))) (and (or (and .cse22 .cse23) .cse0) (or (and (or .cse14 (and .cse24 (or .cse25 .cse26 .cse13 .cse27 .cse28))) .cse23) .cse3)))) (or (and (or (and (or (and .cse6 .cse24) .cse5) (or .cse14 (and .cse24 .cse17))) .cse3) (or .cse0 (and (or (and .cse24 (or .cse26 .cse29 .cse30 .cse13 .cse31)) .cse5) .cse22))) .cse8)))) (not .cse21))))))) is different from true [2022-11-03 04:12:20,280 WARN L855 $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 [2022-11-03 04:13:07,274 WARN L833 $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 [2022-11-03 04:13:09,278 WARN L855 $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 [2022-11-03 04:13:09,279 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2022-11-03 04:13:09,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 04:13:09,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511622123] [2022-11-03 04:13:09,279 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 04:13:09,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689384316] [2022-11-03 04:13:09,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689384316] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:13:09,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [382209936] [2022-11-03 04:13:09,283 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-03 04:13:09,283 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 04:13:09,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 04:13:09,284 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 04:13:09,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 04:13:09,432 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 04:13:14,843 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '294#(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 [2022-11-03 04:13:14,843 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 04:13:14,843 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 04:13:14,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 14 [2022-11-03 04:13:14,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107761518] [2022-11-03 04:13:14,844 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 04:13:14,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 04:13:14,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 04:13:14,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 04:13:14,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=122, Unknown=11, NotChecked=162, Total=342 [2022-11-03 04:13:14,846 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) [2022-11-03 04:14:32,023 WARN L234 SmtUtils]: Spent 1.07m on a formula simplification. DAG size of input: 51 DAG size of output: 30 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 04:17:00,844 WARN L234 SmtUtils]: Spent 2.33m on a formula simplification. DAG size of input: 153 DAG size of output: 47 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 04:17:20,467 WARN L234 SmtUtils]: Spent 18.70s on a formula simplification. DAG size of input: 37 DAG size of output: 31 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 04:17:22,477 WARN L833 $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 [2022-11-03 04:17:24,483 WARN L833 $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))))) (not (<= |c_ULTIMATE.start___VERIFIER_assert_~cond#1| 0)) (<= 0 |c_ULTIMATE.start___VERIFIER_assert_~cond#1|)) is different from false [2022-11-03 04:17:25,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:17:25,969 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-11-03 04:17:25,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 04:17:25,970 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 [2022-11-03 04:17:25,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:17:25,970 INFO L225 Difference]: With dead ends: 26 [2022-11-03 04:17:25,971 INFO L226 Difference]: Without dead ends: 23 [2022-11-03 04:17:25,971 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 8 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 298.4s TimeCoverageRelationStatistics Valid=65, Invalid=186, Unknown=21, NotChecked=280, Total=552 [2022-11-03 04:17:25,972 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 04:17:25,973 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 96 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 0 Unknown, 86 Unchecked, 0.1s Time] [2022-11-03 04:17:25,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-03 04:17:25,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-03 04:17:25,978 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) [2022-11-03 04:17:25,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-11-03 04:17:25,979 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 8 [2022-11-03 04:17:25,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:17:25,979 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-11-03 04:17:25,979 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) [2022-11-03 04:17:25,979 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-11-03 04:17:25,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 04:17:25,980 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:17:25,980 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2022-11-03 04:17:25,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 04:17:26,182 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:17:26,182 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 04:17:26,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:17:26,183 INFO L85 PathProgramCache]: Analyzing trace with hash 330067951, now seen corresponding path program 3 times [2022-11-03 04:17:26,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 04:17:26,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937640443] [2022-11-03 04:17:26,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:17:26,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 04:17:26,198 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 04:17:26,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1407661351] [2022-11-03 04:17:26,199 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:17:26,199 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:17:26,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:17:26,201 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:17:26,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03ab221b-8c1a-429f-86ec-17847d03fea5/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 04:17:55,839 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:17:55,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:17:55,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-03 04:17:55,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:18:14,678 WARN L833 $PredicateComparison]: unable to prove that (and (or (and (= (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|) 0) (<= |c_ULTIMATE.start_gcd_test_~a#1| 127) (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|)) (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) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_gcd_test_~b#1|) 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (<= .cse0 127)) (= (+ |c_ULTIMATE.start_gcd_test_~a#1| 256) .cse0)))) (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) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |c_ULTIMATE.start_gcd_test_~b#1|) 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= .cse1 127) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse1))))) (<= |c_ULTIMATE.start_gcd_test_~b#1| 127) (< 0 |c_ULTIMATE.start_gcd_test_~b#1|)) is different from false [2022-11-03 04:18:29,562 WARN L234 SmtUtils]: Spent 7.62s on a formula simplification. DAG size of input: 43 DAG size of output: 34 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 04:19:20,027 WARN L833 $PredicateComparison]: unable to prove that (and (not (< |c_ULTIMATE.start_gcd_test_~a#1| 0)) (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0)) (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_33| Int)) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_33| |c_ULTIMATE.start_gcd_test_~a#1|) 256) |c_ULTIMATE.start_gcd_test_~b#1|) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |v_ULTIMATE.start_gcd_test_~a#1_33|) 0) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_33|) (= (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |v_ULTIMATE.start_gcd_test_~a#1_33|) 256) |c_ULTIMATE.start_gcd_test_~a#1|)))) is different from false [2022-11-03 04:20:09,438 WARN L833 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_33| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |v_ULTIMATE.start_gcd_test_~a#1_33|) 256))) (let ((.cse1 (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_33| .cse0) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |v_ULTIMATE.start_gcd_test_~a#1_33|) 0) (not (= .cse0 0)) (= (mod (mod .cse0 .cse1) 256) |c_ULTIMATE.start_gcd_test_~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (= .cse1 0)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_33|) (<= .cse1 |c_ULTIMATE.start_gcd_test_~a#1|))))) is different from false [2022-11-03 04:20:35,707 WARN L833 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_33| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |v_ULTIMATE.start_gcd_test_~a#1_33|) 256))) (let ((.cse1 (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_33| .cse0) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod (mod .cse0 .cse1) 256) 0) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |v_ULTIMATE.start_gcd_test_~a#1_33|) 0) (not (= .cse0 0)) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (= .cse1 0)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_33|))))) is different from false [2022-11-03 04:20:37,710 WARN L855 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_gcd_test_#in~a#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_33| Int)) (let ((.cse0 (mod (mod (mod (* 255 |ULTIMATE.start_gcd_test_#in~a#1|) 256) |v_ULTIMATE.start_gcd_test_~a#1_33|) 256))) (let ((.cse1 (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_33| .cse0) 256))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= (mod (mod .cse0 .cse1) 256) 0) (= (mod |ULTIMATE.start_gcd_test_#in~a#1| |v_ULTIMATE.start_gcd_test_~a#1_33|) 0) (not (= .cse0 0)) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (not (= .cse1 0)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_33|))))) is different from true [2022-11-03 04:21:00,601 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 6 not checked. [2022-11-03 04:21:00,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:23:05,698 WARN L234 SmtUtils]: Spent 1.61m on a formula simplification. DAG size of input: 119 DAG size of output: 117 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)