./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_1+newton_2_8.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b 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_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_1+newton_2_8.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS --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 24df3a04bdb7e751c4f0d163e80822f74241222ac6f56a91a0bf72df65694e1b --- 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-8393723 [2022-11-19 06:59:22,995 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 06:59:22,998 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 06:59:23,040 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 06:59:23,040 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 06:59:23,045 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 06:59:23,047 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 06:59:23,051 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 06:59:23,053 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 06:59:23,061 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 06:59:23,063 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 06:59:23,064 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 06:59:23,065 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 06:59:23,067 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 06:59:23,068 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 06:59:23,070 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 06:59:23,071 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 06:59:23,072 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 06:59:23,074 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 06:59:23,081 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 06:59:23,083 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 06:59:23,084 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 06:59:23,087 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 06:59:23,088 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 06:59:23,097 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 06:59:23,097 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 06:59:23,098 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 06:59:23,100 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 06:59:23,100 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 06:59:23,101 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 06:59:23,101 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 06:59:23,103 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 06:59:23,104 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 06:59:23,106 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 06:59:23,107 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 06:59:23,108 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 06:59:23,109 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 06:59:23,109 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 06:59:23,109 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 06:59:23,110 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 06:59:23,111 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 06:59:23,112 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 06:59:23,155 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 06:59:23,155 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 06:59:23,156 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 06:59:23,156 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 06:59:23,157 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 06:59:23,157 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 06:59:23,158 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 06:59:23,158 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 06:59:23,158 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 06:59:23,158 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 06:59:23,159 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 06:59:23,160 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 06:59:23,160 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 06:59:23,160 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 06:59:23,160 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 06:59:23,161 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 06:59:23,161 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 06:59:23,161 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 06:59:23,162 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 06:59:23,162 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 06:59:23,162 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 06:59:23,163 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 06:59:23,163 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 06:59:23,163 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 06:59:23,165 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 06:59:23,165 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 06:59:23,166 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 06:59:23,166 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 06:59:23,166 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 06:59:23,166 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 06:59:23,167 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 06:59:23,167 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 06:59:23,167 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:59:23,167 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 06:59:23,168 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 06:59:23,168 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 06:59:23,168 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 06:59:23,168 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 06:59:23,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 06:59:23,169 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 06:59:23,169 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 06:59:23,169 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_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 24df3a04bdb7e751c4f0d163e80822f74241222ac6f56a91a0bf72df65694e1b [2022-11-19 06:59:23,449 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 06:59:23,477 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 06:59:23,479 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 06:59:23,480 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 06:59:23,481 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 06:59:23,482 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/combinations/gcd_1+newton_2_8.i [2022-11-19 06:59:23,559 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/data/c7cd1cbf8/2ffa2034041e4d4692ccf78895b88fbd/FLAG9fc2e90ed [2022-11-19 06:59:24,079 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 06:59:24,083 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/sv-benchmarks/c/combinations/gcd_1+newton_2_8.i [2022-11-19 06:59:24,091 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/data/c7cd1cbf8/2ffa2034041e4d4692ccf78895b88fbd/FLAG9fc2e90ed [2022-11-19 06:59:24,455 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/data/c7cd1cbf8/2ffa2034041e4d4692ccf78895b88fbd [2022-11-19 06:59:24,458 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 06:59:24,459 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 06:59:24,461 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 06:59:24,461 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 06:59:24,465 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 06:59:24,465 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,467 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c649e99 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24, skipping insertion in model container [2022-11-19 06:59:24,467 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,474 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 06:59:24,491 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 06:59:24,687 WARN L234 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_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/sv-benchmarks/c/combinations/gcd_1+newton_2_8.i[1226,1239] [2022-11-19 06:59:24,708 WARN L234 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_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/sv-benchmarks/c/combinations/gcd_1+newton_2_8.i[2807,2820] [2022-11-19 06:59:24,709 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:59:24,717 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 06:59:24,728 WARN L234 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_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/sv-benchmarks/c/combinations/gcd_1+newton_2_8.i[1226,1239] [2022-11-19 06:59:24,738 WARN L234 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_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/sv-benchmarks/c/combinations/gcd_1+newton_2_8.i[2807,2820] [2022-11-19 06:59:24,739 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:59:24,750 INFO L208 MainTranslator]: Completed translation [2022-11-19 06:59:24,751 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24 WrapperNode [2022-11-19 06:59:24,751 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 06:59:24,752 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 06:59:24,752 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 06:59:24,752 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 06:59:24,759 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,766 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,787 INFO L138 Inliner]: procedures = 27, calls = 24, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 85 [2022-11-19 06:59:24,787 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 06:59:24,788 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 06:59:24,788 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 06:59:24,788 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 06:59:24,796 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,796 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,798 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,798 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,803 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,806 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,808 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,809 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,822 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 06:59:24,823 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 06:59:24,823 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 06:59:24,824 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 06:59:24,825 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (1/1) ... [2022-11-19 06:59:24,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:59:24,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:59:24,851 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 06:59:24,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 06:59:24,884 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 06:59:24,884 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2022-11-19 06:59:24,885 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2022-11-19 06:59:24,885 INFO L130 BoogieDeclarations]: Found specification of procedure f [2022-11-19 06:59:24,885 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2022-11-19 06:59:24,885 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 06:59:24,885 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 06:59:24,885 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 06:59:24,959 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 06:59:24,961 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 06:59:25,211 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 06:59:25,307 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 06:59:25,307 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-19 06:59:25,309 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:59:25 BoogieIcfgContainer [2022-11-19 06:59:25,310 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 06:59:25,311 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 06:59:25,312 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 06:59:25,315 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 06:59:25,315 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 06:59:24" (1/3) ... [2022-11-19 06:59:25,316 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e800ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:59:25, skipping insertion in model container [2022-11-19 06:59:25,316 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:59:24" (2/3) ... [2022-11-19 06:59:25,317 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e800ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:59:25, skipping insertion in model container [2022-11-19 06:59:25,317 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:59:25" (3/3) ... [2022-11-19 06:59:25,318 INFO L112 eAbstractionObserver]: Analyzing ICFG gcd_1+newton_2_8.i [2022-11-19 06:59:25,354 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 06:59:25,354 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-19 06:59:25,449 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 06:59:25,462 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;@418abf1f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 06:59:25,462 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-19 06:59:25,466 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) [2022-11-19 06:59:25,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-19 06:59:25,477 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:59:25,478 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-19 06:59:25,478 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:59:25,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:59:25,488 INFO L85 PathProgramCache]: Analyzing trace with hash -592026431, now seen corresponding path program 1 times [2022-11-19 06:59:25,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:59:25,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075512092] [2022-11-19 06:59:25,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:59:25,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:59:25,643 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:59:25,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [385334011] [2022-11-19 06:59:25,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:59:25,644 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:59:25,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:59:25,651 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:59:25,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 06:59:25,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:59:25,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-19 06:59:25,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:59:25,979 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:59:25,979 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:59:25,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:59:25,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075512092] [2022-11-19 06:59:25,980 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:59:25,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385334011] [2022-11-19 06:59:25,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385334011] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:59:25,982 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:59:25,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 06:59:25,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045899911] [2022-11-19 06:59:25,988 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:59:25,992 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 06:59:25,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:59:26,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 06:59:26,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 06:59:26,042 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) [2022-11-19 06:59:26,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:59:26,115 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2022-11-19 06:59:26,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 06:59:26,118 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 [2022-11-19 06:59:26,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:59:26,125 INFO L225 Difference]: With dead ends: 34 [2022-11-19 06:59:26,126 INFO L226 Difference]: Without dead ends: 21 [2022-11-19 06:59:26,129 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 [2022-11-19 06:59:26,137 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 [2022-11-19 06:59:26,138 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] [2022-11-19 06:59:26,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-19 06:59:26,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-19 06:59:26,170 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) [2022-11-19 06:59:26,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-11-19 06:59:26,173 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2022-11-19 06:59:26,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:59:26,173 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-11-19 06:59:26,173 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) [2022-11-19 06:59:26,174 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-11-19 06:59:26,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-19 06:59:26,175 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:59:26,175 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:59:26,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 06:59:26,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-19 06:59:26,382 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:59:26,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:59:26,383 INFO L85 PathProgramCache]: Analyzing trace with hash -1175005777, now seen corresponding path program 1 times [2022-11-19 06:59:26,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:59:26,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947584481] [2022-11-19 06:59:26,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:59:26,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:59:26,414 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:59:26,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [297059285] [2022-11-19 06:59:26,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:59:26,417 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:59:26,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:59:26,420 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:59:26,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 06:59:26,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:59:26,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 06:59:26,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:59:26,609 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:59:26,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:59:26,659 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 06:59:26,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:59:26,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947584481] [2022-11-19 06:59:26,660 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:59:26,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297059285] [2022-11-19 06:59:26,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297059285] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:59:26,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [747187275] [2022-11-19 06:59:26,694 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-19 06:59:26,694 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:59:26,698 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:59:26,703 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:59:26,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:59:26,978 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:59:27,405 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 [2022-11-19 06:59:27,405 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:59:27,405 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:59:27,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-11-19 06:59:27,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523367975] [2022-11-19 06:59:27,406 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:59:27,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-19 06:59:27,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:59:27,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-19 06:59:27,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-11-19 06:59:27,407 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) [2022-11-19 06:59:27,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:59:27,483 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-11-19 06:59:27,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:59:27,484 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 [2022-11-19 06:59:27,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:59:27,484 INFO L225 Difference]: With dead ends: 25 [2022-11-19 06:59:27,485 INFO L226 Difference]: Without dead ends: 22 [2022-11-19 06:59:27,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-11-19 06:59:27,489 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 [2022-11-19 06:59:27,493 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] [2022-11-19 06:59:27,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-19 06:59:27,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-19 06:59:27,502 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) [2022-11-19 06:59:27,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-11-19 06:59:27,504 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 7 [2022-11-19 06:59:27,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:59:27,505 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-11-19 06:59:27,506 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) [2022-11-19 06:59:27,506 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-11-19 06:59:27,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-19 06:59:27,507 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:59:27,507 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2022-11-19 06:59:27,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 06:59:27,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:59:27,713 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:59:27,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:59:27,713 INFO L85 PathProgramCache]: Analyzing trace with hash -2067496319, now seen corresponding path program 2 times [2022-11-19 06:59:27,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:59:27,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433465842] [2022-11-19 06:59:27,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:59:27,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:59:27,725 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:59:27,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [889363983] [2022-11-19 06:59:27,731 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:59:27,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:59:27,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:59:27,733 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:59:27,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 06:59:39,396 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-19 06:59:39,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:59:39,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-19 06:59:39,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:59:59,173 WARN L233 SmtUtils]: Spent 5.01s on a formula simplification that was a NOOP. DAG size: 35 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 07:00:19,603 WARN L233 SmtUtils]: Spent 10.64s 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) [2022-11-19 07:00:41,977 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 [2022-11-19 07:01:13,018 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 [2022-11-19 07:01:33,060 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 [2022-11-19 07:01:35,063 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 [2022-11-19 07:01:35,064 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2022-11-19 07:01:35,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:02:40,277 WARN L859 $PredicateComparison]: unable to prove that (or (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))))))) (= |c_ULTIMATE.start_gcd_test_~b#1| 0)) is different from true [2022-11-19 07:03:12,219 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 [2022-11-19 07:04:00,327 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 [2022-11-19 07:04:02,329 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 [2022-11-19 07:04:02,330 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2022-11-19 07:04:02,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:04:02,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433465842] [2022-11-19 07:04:02,330 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 07:04:02,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889363983] [2022-11-19 07:04:02,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889363983] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:04:02,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [604012808] [2022-11-19 07:04:02,333 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-19 07:04:02,333 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:04:02,334 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:04:02,334 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:04:02,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:04:02,445 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:04:06,316 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 [2022-11-19 07:04:06,317 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:04:06,317 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 07:04:06,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 14 [2022-11-19 07:04:06,317 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857260274] [2022-11-19 07:04:06,318 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 07:04:06,318 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 07:04:06,318 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:04:06,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 07:04:06,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=123, Unknown=10, NotChecked=162, Total=342 [2022-11-19 07:04:06,319 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) [2022-11-19 07:05:04,043 WARN L233 SmtUtils]: Spent 43.68s 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) [2022-11-19 07:05:06,136 WARN L837 $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 false [2022-11-19 07:05:08,141 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 [2022-11-19 07:05:34,915 WARN L233 SmtUtils]: Spent 21.97s 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) [2022-11-19 07:05:36,926 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 [2022-11-19 07:05:36,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:05:36,940 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-11-19 07:05:36,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 07:05:36,940 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 [2022-11-19 07:05:36,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:05:36,941 INFO L225 Difference]: With dead ends: 26 [2022-11-19 07:05:36,941 INFO L226 Difference]: Without dead ends: 23 [2022-11-19 07:05:36,942 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 8 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 129.1s TimeCoverageRelationStatistics Valid=59, Invalid=164, Unknown=19, NotChecked=264, Total=506 [2022-11-19 07:05:36,943 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 82 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 [2022-11-19 07:05:36,943 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] [2022-11-19 07:05:36,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-19 07:05:36,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-19 07:05:36,950 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) [2022-11-19 07:05:36,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-11-19 07:05:36,951 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 8 [2022-11-19 07:05:36,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:05:36,952 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-11-19 07:05:36,952 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) [2022-11-19 07:05:36,952 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-11-19 07:05:36,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 07:05:36,953 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:05:36,953 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2022-11-19 07:05:36,963 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-19 07:05:37,159 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:05:37,160 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:05:37,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:05:37,160 INFO L85 PathProgramCache]: Analyzing trace with hash 330067951, now seen corresponding path program 3 times [2022-11-19 07:05:37,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:05:37,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693967107] [2022-11-19 07:05:37,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:05:37,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:05:37,170 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 07:05:37,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [495158222] [2022-11-19 07:05:37,176 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:05:37,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:05:37,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:05:37,179 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:05:37,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a2a3c82-8f77-49f7-bc07-1aea1c9e4031/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 07:05:45,204 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:05:45,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:05:45,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-19 07:05:45,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:07:20,856 WARN L837 $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))) (and (< |ULTIMATE.start_gcd_test_#in~a#1| 0) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_33| .cse0) 256)) (= (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)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_33|) (= .cse0 |c_ULTIMATE.start_gcd_test_~a#1|)))) is different from false [2022-11-19 07:08:00,412 WARN L837 $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|))))) is different from false [2022-11-19 07:08:26,982 WARN L837 $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 [2022-11-19 07:08:28,986 WARN L859 $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 [2022-11-19 07:08:51,715 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 1 times theorem prover too weak. 0 trivial. 5 not checked. [2022-11-19 07:08:51,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:59,785 WARN L233 SmtUtils]: Spent 2.31m on a formula simplification that was a NOOP. DAG size: 115 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)