./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_4+newton_3_3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b 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_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/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_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_4+newton_3_3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/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_19729169-2806-47ba-9d5b-cd1cab62f3da/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 fac7e7835446ac69229cd712eb8181e46fef468b0e6881ccc6e306adaaef48bd --- 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 08:27:47,988 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 08:27:47,993 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 08:27:48,022 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 08:27:48,023 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 08:27:48,024 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 08:27:48,026 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 08:27:48,028 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 08:27:48,032 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 08:27:48,033 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 08:27:48,035 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 08:27:48,038 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 08:27:48,040 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 08:27:48,043 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 08:27:48,045 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 08:27:48,047 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 08:27:48,050 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 08:27:48,055 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 08:27:48,058 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 08:27:48,060 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 08:27:48,064 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 08:27:48,065 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 08:27:48,066 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 08:27:48,067 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 08:27:48,071 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 08:27:48,071 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 08:27:48,072 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 08:27:48,073 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 08:27:48,073 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 08:27:48,075 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 08:27:48,075 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 08:27:48,076 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 08:27:48,077 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 08:27:48,078 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 08:27:48,079 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 08:27:48,079 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 08:27:48,080 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 08:27:48,080 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 08:27:48,081 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 08:27:48,082 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 08:27:48,082 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 08:27:48,084 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 08:27:48,128 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 08:27:48,128 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 08:27:48,129 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 08:27:48,129 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 08:27:48,130 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 08:27:48,130 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 08:27:48,131 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 08:27:48,131 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 08:27:48,131 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 08:27:48,131 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 08:27:48,133 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 08:27:48,133 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 08:27:48,133 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 08:27:48,134 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 08:27:48,134 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 08:27:48,134 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 08:27:48,135 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 08:27:48,135 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 08:27:48,136 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 08:27:48,136 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 08:27:48,136 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 08:27:48,137 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 08:27:48,137 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 08:27:48,137 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 08:27:48,137 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 08:27:48,138 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 08:27:48,138 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 08:27:48,140 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 08:27:48,140 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 08:27:48,140 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 08:27:48,140 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 08:27:48,141 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 08:27:48,141 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:27:48,141 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 08:27:48,141 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 08:27:48,142 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 08:27:48,142 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 08:27:48,142 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 08:27:48,142 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 08:27:48,142 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 08:27:48,143 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 08:27:48,143 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_19729169-2806-47ba-9d5b-cd1cab62f3da/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fac7e7835446ac69229cd712eb8181e46fef468b0e6881ccc6e306adaaef48bd [2022-11-19 08:27:48,524 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 08:27:48,547 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 08:27:48,549 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 08:27:48,551 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 08:27:48,551 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 08:27:48,553 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/combinations/gcd_4+newton_3_3.i [2022-11-19 08:27:48,624 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/data/2c0d37edf/a9ce55038b1d499a977d0228d742f2bd/FLAG6457316b6 [2022-11-19 08:27:49,065 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 08:27:49,066 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/sv-benchmarks/c/combinations/gcd_4+newton_3_3.i [2022-11-19 08:27:49,083 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/data/2c0d37edf/a9ce55038b1d499a977d0228d742f2bd/FLAG6457316b6 [2022-11-19 08:27:49,445 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/data/2c0d37edf/a9ce55038b1d499a977d0228d742f2bd [2022-11-19 08:27:49,450 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 08:27:49,454 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 08:27:49,460 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 08:27:49,461 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 08:27:49,465 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 08:27:49,466 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,468 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a692d52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49, skipping insertion in model container [2022-11-19 08:27:49,469 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,478 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 08:27:49,503 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 08:27:49,720 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_19729169-2806-47ba-9d5b-cd1cab62f3da/sv-benchmarks/c/combinations/gcd_4+newton_3_3.i[1224,1237] [2022-11-19 08:27:49,750 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_19729169-2806-47ba-9d5b-cd1cab62f3da/sv-benchmarks/c/combinations/gcd_4+newton_3_3.i[2848,2861] [2022-11-19 08:27:49,752 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:27:49,762 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 08:27:49,774 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_19729169-2806-47ba-9d5b-cd1cab62f3da/sv-benchmarks/c/combinations/gcd_4+newton_3_3.i[1224,1237] [2022-11-19 08:27:49,791 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_19729169-2806-47ba-9d5b-cd1cab62f3da/sv-benchmarks/c/combinations/gcd_4+newton_3_3.i[2848,2861] [2022-11-19 08:27:49,792 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:27:49,809 INFO L208 MainTranslator]: Completed translation [2022-11-19 08:27:49,809 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49 WrapperNode [2022-11-19 08:27:49,809 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 08:27:49,810 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 08:27:49,810 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 08:27:49,811 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 08:27:49,818 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,839 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,875 INFO L138 Inliner]: procedures = 27, calls = 28, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 85 [2022-11-19 08:27:49,875 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 08:27:49,876 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 08:27:49,877 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 08:27:49,877 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 08:27:49,887 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,887 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,891 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,891 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,899 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,903 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,904 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,905 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,907 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 08:27:49,908 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 08:27:49,908 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 08:27:49,908 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 08:27:49,923 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (1/1) ... [2022-11-19 08:27:49,930 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:27:49,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:49,960 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 08:27:49,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 08:27:50,005 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 08:27:50,006 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2022-11-19 08:27:50,006 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2022-11-19 08:27:50,006 INFO L130 BoogieDeclarations]: Found specification of procedure f [2022-11-19 08:27:50,006 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2022-11-19 08:27:50,006 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 08:27:50,006 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 08:27:50,006 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 08:27:50,006 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-19 08:27:50,007 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-19 08:27:50,089 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 08:27:50,091 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 08:27:50,326 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 08:27:50,419 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 08:27:50,419 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-19 08:27:50,421 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:27:50 BoogieIcfgContainer [2022-11-19 08:27:50,422 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 08:27:50,424 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 08:27:50,424 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 08:27:50,427 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 08:27:50,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 08:27:49" (1/3) ... [2022-11-19 08:27:50,429 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12a704d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:27:50, skipping insertion in model container [2022-11-19 08:27:50,429 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:27:49" (2/3) ... [2022-11-19 08:27:50,429 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12a704d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:27:50, skipping insertion in model container [2022-11-19 08:27:50,429 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:27:50" (3/3) ... [2022-11-19 08:27:50,431 INFO L112 eAbstractionObserver]: Analyzing ICFG gcd_4+newton_3_3.i [2022-11-19 08:27:50,449 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 08:27:50,449 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-19 08:27:50,522 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 08:27:50,531 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;@428f7d7a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 08:27:50,532 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-19 08:27:50,538 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 19 states have (on average 1.368421052631579) internal successors, (26), 21 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 08:27:50,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-19 08:27:50,547 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:50,547 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:50,548 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:50,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:50,557 INFO L85 PathProgramCache]: Analyzing trace with hash 259234294, now seen corresponding path program 1 times [2022-11-19 08:27:50,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:50,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872106117] [2022-11-19 08:27:50,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:50,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:50,720 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:27:50,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [62003911] [2022-11-19 08:27:50,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:50,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:50,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:50,730 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:50,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 08:27:50,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:50,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 08:27:50,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:50,966 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 08:27:50,966 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:27:50,966 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:50,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872106117] [2022-11-19 08:27:50,967 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:27:50,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62003911] [2022-11-19 08:27:50,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62003911] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:27:50,969 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:27:50,969 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:27:50,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837794608] [2022-11-19 08:27:50,973 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:27:50,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:27:50,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:51,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:27:51,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:27:51,019 INFO L87 Difference]: Start difference. First operand has 34 states, 19 states have (on average 1.368421052631579) internal successors, (26), 21 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:27:51,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:51,119 INFO L93 Difference]: Finished difference Result 56 states and 77 transitions. [2022-11-19 08:27:51,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:27:51,122 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 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 08:27:51,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:51,141 INFO L225 Difference]: With dead ends: 56 [2022-11-19 08:27:51,141 INFO L226 Difference]: Without dead ends: 35 [2022-11-19 08:27:51,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:27:51,150 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 5 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:51,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 63 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:27:51,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-19 08:27:51,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2022-11-19 08:27:51,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 16 states have (on average 1.1875) internal successors, (19), 18 states have internal predecessors, (19), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-19 08:27:51,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2022-11-19 08:27:51,212 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 8 [2022-11-19 08:27:51,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:51,214 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2022-11-19 08:27:51,215 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:27:51,215 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2022-11-19 08:27:51,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 08:27:51,218 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:51,218 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:51,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:51,431 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-19 08:27:51,431 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:51,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:51,432 INFO L85 PathProgramCache]: Analyzing trace with hash -659222671, now seen corresponding path program 1 times [2022-11-19 08:27:51,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:51,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141714938] [2022-11-19 08:27:51,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:51,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:51,459 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:27:51,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1872554811] [2022-11-19 08:27:51,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:51,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:51,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:51,465 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:51,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 08:27:51,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:51,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 08:27:51,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:51,587 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 08:27:51,588 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:27:51,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:51,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141714938] [2022-11-19 08:27:51,590 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:27:51,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872554811] [2022-11-19 08:27:51,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872554811] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:27:51,592 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:27:51,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:27:51,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820176349] [2022-11-19 08:27:51,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:27:51,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:27:51,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:51,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:27:51,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:27:51,596 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:27:51,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:51,629 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2022-11-19 08:27:51,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:27:51,630 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-19 08:27:51,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:51,632 INFO L225 Difference]: With dead ends: 41 [2022-11-19 08:27:51,632 INFO L226 Difference]: Without dead ends: 31 [2022-11-19 08:27:51,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 7 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 08:27:51,635 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:51,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 57 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:27:51,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-19 08:27:51,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-19 08:27:51,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 19 states have internal predecessors, (20), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-19 08:27:51,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2022-11-19 08:27:51,648 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 9 [2022-11-19 08:27:51,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:51,648 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2022-11-19 08:27:51,649 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:27:51,649 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2022-11-19 08:27:51,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-19 08:27:51,649 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:51,650 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:51,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:51,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:51,855 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:51,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:51,857 INFO L85 PathProgramCache]: Analyzing trace with hash -239223413, now seen corresponding path program 1 times [2022-11-19 08:27:51,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:51,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403433586] [2022-11-19 08:27:51,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:51,858 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:51,886 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:27:51,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [542690626] [2022-11-19 08:27:51,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:51,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:51,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:51,889 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:51,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 08:27:51,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:51,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 08:27:51,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:52,088 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 08:27:52,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:27:52,134 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 08:27:52,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:52,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403433586] [2022-11-19 08:27:52,135 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:27:52,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542690626] [2022-11-19 08:27:52,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542690626] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:27:52,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [483717456] [2022-11-19 08:27:52,158 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 08:27:52,158 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:27:52,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:27:52,168 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:27:52,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:27:52,725 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-19 08:27:52,758 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:27:53,326 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '384#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:27:53,326 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:27:53,327 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:27:53,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2022-11-19 08:27:53,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923828692] [2022-11-19 08:27:53,327 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:27:53,328 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:27:53,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:53,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:27:53,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-11-19 08:27:53,329 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:27:53,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:53,420 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2022-11-19 08:27:53,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 08:27:53,421 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-19 08:27:53,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:53,424 INFO L225 Difference]: With dead ends: 43 [2022-11-19 08:27:53,424 INFO L226 Difference]: Without dead ends: 33 [2022-11-19 08:27:53,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2022-11-19 08:27:53,430 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 3 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:53,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 105 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:27:53,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-19 08:27:53,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-19 08:27:53,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 21 states have internal predecessors, (22), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-19 08:27:53,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2022-11-19 08:27:53,447 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 10 [2022-11-19 08:27:53,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:53,447 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2022-11-19 08:27:53,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:27:53,448 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2022-11-19 08:27:53,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-19 08:27:53,450 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:53,450 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:53,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:53,656 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:53,656 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:53,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:53,657 INFO L85 PathProgramCache]: Analyzing trace with hash -211787189, now seen corresponding path program 2 times [2022-11-19 08:27:53,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:53,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380224446] [2022-11-19 08:27:53,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:53,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:53,693 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:27:53,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [752008988] [2022-11-19 08:27:53,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:27:53,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:53,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:53,699 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:53,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 08:27:53,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 08:27:53,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:27:53,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-19 08:27:53,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:53,870 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:27:53,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:27:54,142 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:27:54,142 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:54,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380224446] [2022-11-19 08:27:54,143 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:27:54,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752008988] [2022-11-19 08:27:54,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752008988] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:27:54,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [495190481] [2022-11-19 08:27:54,154 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 08:27:54,154 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:27:54,155 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:27:54,155 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:27:54,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:27:54,463 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-19 08:27:54,495 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:27:55,020 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '585#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:27:55,020 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:27:55,020 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:27:55,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-11-19 08:27:55,021 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088295733] [2022-11-19 08:27:55,021 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:27:55,021 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-19 08:27:55,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:55,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-19 08:27:55,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2022-11-19 08:27:55,022 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 10 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:27:55,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:55,170 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2022-11-19 08:27:55,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 08:27:55,171 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-19 08:27:55,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:55,172 INFO L225 Difference]: With dead ends: 44 [2022-11-19 08:27:55,172 INFO L226 Difference]: Without dead ends: 34 [2022-11-19 08:27:55,173 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2022-11-19 08:27:55,174 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 7 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:55,174 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 156 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:27:55,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-19 08:27:55,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-11-19 08:27:55,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 20 states have (on average 1.15) internal successors, (23), 22 states have internal predecessors, (23), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-19 08:27:55,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2022-11-19 08:27:55,183 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 12 [2022-11-19 08:27:55,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:55,184 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2022-11-19 08:27:55,184 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:27:55,184 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2022-11-19 08:27:55,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-19 08:27:55,185 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:55,185 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:55,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:55,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:55,392 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:55,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:55,392 INFO L85 PathProgramCache]: Analyzing trace with hash 746374641, now seen corresponding path program 3 times [2022-11-19 08:27:55,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:55,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497108200] [2022-11-19 08:27:55,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:55,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:55,412 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:27:55,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1741462679] [2022-11-19 08:27:55,412 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:27:55,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:55,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:55,414 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:55,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 08:27:55,496 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:27:55,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:27:55,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-19 08:27:55,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:55,570 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:27:55,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:27:55,956 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:27:55,957 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:55,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497108200] [2022-11-19 08:27:55,957 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:27:55,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741462679] [2022-11-19 08:27:55,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741462679] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:27:55,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [151444581] [2022-11-19 08:27:55,966 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 08:27:55,966 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:27:55,966 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:27:55,966 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:27:55,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:27:56,191 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-19 08:27:56,221 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:27:56,806 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '798#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:27:56,806 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:27:56,806 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:27:56,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-11-19 08:27:56,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685970230] [2022-11-19 08:27:56,807 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:27:56,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 08:27:56,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:56,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 08:27:56,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2022-11-19 08:27:56,808 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:27:57,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:57,305 INFO L93 Difference]: Finished difference Result 49 states and 61 transitions. [2022-11-19 08:27:57,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 08:27:57,307 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-19 08:27:57,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:57,308 INFO L225 Difference]: With dead ends: 49 [2022-11-19 08:27:57,308 INFO L226 Difference]: Without dead ends: 39 [2022-11-19 08:27:57,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=123, Invalid=477, Unknown=0, NotChecked=0, Total=600 [2022-11-19 08:27:57,310 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:57,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 154 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:27:57,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-11-19 08:27:57,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-11-19 08:27:57,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-19 08:27:57,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2022-11-19 08:27:57,327 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 13 [2022-11-19 08:27:57,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:57,327 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2022-11-19 08:27:57,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:27:57,328 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2022-11-19 08:27:57,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 08:27:57,331 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:57,332 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:57,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:57,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:57,538 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:57,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:57,538 INFO L85 PathProgramCache]: Analyzing trace with hash 384620299, now seen corresponding path program 4 times [2022-11-19 08:27:57,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:57,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738840378] [2022-11-19 08:27:57,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:57,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:57,556 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:27:57,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1462073096] [2022-11-19 08:27:57,556 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:27:57,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:57,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:57,557 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:57,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 08:27:57,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:57,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-19 08:27:57,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:57,833 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:27:57,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:28:16,197 WARN L233 SmtUtils]: Spent 12.33s on a formula simplification that was a NOOP. DAG size: 41 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:29:15,018 WARN L233 SmtUtils]: Spent 49.39s on a formula simplification. DAG size of input: 78 DAG size of output: 78 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:33:10,790 WARN L233 SmtUtils]: Spent 2.68m on a formula simplification that was a NOOP. DAG size: 141 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:33:59,686 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:33:59,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:33:59,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738840378] [2022-11-19 08:33:59,687 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:33:59,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462073096] [2022-11-19 08:33:59,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462073096] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:33:59,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [616826011] [2022-11-19 08:33:59,690 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-19 08:33:59,690 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:33:59,690 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:33:59,691 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:33:59,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:33:59,953 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2022-11-19 08:33:59,974 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:34:11,253 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1055#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:34:11,253 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:34:11,253 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:34:11,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2022-11-19 08:34:11,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777980495] [2022-11-19 08:34:11,254 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:34:11,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 08:34:11,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:34:11,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 08:34:11,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=739, Unknown=10, NotChecked=0, Total=870 [2022-11-19 08:34:11,256 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand has 22 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:34:13,284 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2022-11-19 08:34:16,631 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Real, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:34:19,078 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Real, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:34:21,122 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:34:26,445 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:34:28,467 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:34:30,586 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:34:30,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:34:30,788 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2022-11-19 08:34:30,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 08:34:30,790 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-19 08:34:30,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:34:30,791 INFO L225 Difference]: With dead ends: 53 [2022-11-19 08:34:30,791 INFO L226 Difference]: Without dead ends: 36 [2022-11-19 08:34:30,792 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 265.4s TimeCoverageRelationStatistics Valid=152, Invalid=893, Unknown=11, NotChecked=0, Total=1056 [2022-11-19 08:34:30,792 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 26 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 32 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:34:30,793 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 245 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 208 Invalid, 6 Unknown, 0 Unchecked, 16.2s Time] [2022-11-19 08:34:30,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-19 08:34:30,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-11-19 08:34:30,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 24 states have internal predecessors, (24), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-19 08:34:30,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2022-11-19 08:34:30,803 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 14 [2022-11-19 08:34:30,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:34:30,804 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2022-11-19 08:34:30,804 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:34:30,804 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2022-11-19 08:34:30,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-19 08:34:30,805 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:34:30,806 INFO L195 NwaCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:34:30,812 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-19 08:34:31,011 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:34:31,012 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:34:31,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:34:31,012 INFO L85 PathProgramCache]: Analyzing trace with hash 1742833996, now seen corresponding path program 1 times [2022-11-19 08:34:31,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:34:31,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870946111] [2022-11-19 08:34:31,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:34:31,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:34:31,030 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:34:31,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1299713095] [2022-11-19 08:34:31,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:34:31,031 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:34:31,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:34:31,032 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:34:31,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19729169-2806-47ba-9d5b-cd1cab62f3da/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 08:34:31,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:34:31,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-19 08:34:31,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:34:31,466 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:34:31,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:34:49,686 WARN L233 SmtUtils]: Spent 10.15s on a formula simplification that was a NOOP. DAG size: 40 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:35:27,997 WARN L233 SmtUtils]: Spent 26.89s on a formula simplification that was a NOOP. DAG size: 79 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:42:36,823 WARN L233 SmtUtils]: Spent 6.27m on a formula simplification. DAG size of input: 138 DAG size of output: 138 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)