./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e04fb08f Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0 --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 4548c451706b7658e6a882e8eef66dc3c360e6aea0e4326d7cc0b87e2b58239c --- 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-e04fb08 [2022-11-16 19:40:42,163 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 19:40:42,167 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 19:40:42,209 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 19:40:42,213 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 19:40:42,219 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 19:40:42,223 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 19:40:42,232 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 19:40:42,235 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 19:40:42,241 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 19:40:42,243 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 19:40:42,245 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 19:40:42,247 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 19:40:42,251 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 19:40:42,253 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 19:40:42,256 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 19:40:42,258 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 19:40:42,265 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 19:40:42,268 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 19:40:42,271 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 19:40:42,280 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 19:40:42,281 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 19:40:42,286 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 19:40:42,287 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 19:40:42,298 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 19:40:42,303 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 19:40:42,304 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 19:40:42,305 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 19:40:42,307 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 19:40:42,309 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 19:40:42,310 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 19:40:42,311 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 19:40:42,313 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 19:40:42,315 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 19:40:42,317 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 19:40:42,318 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 19:40:42,320 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 19:40:42,320 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 19:40:42,320 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 19:40:42,322 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 19:40:42,322 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 19:40:42,324 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-16 19:40:42,372 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 19:40:42,372 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 19:40:42,373 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 19:40:42,373 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 19:40:42,375 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 19:40:42,375 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 19:40:42,375 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 19:40:42,376 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 19:40:42,376 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 19:40:42,376 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 19:40:42,377 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 19:40:42,378 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 19:40:42,378 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 19:40:42,378 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 19:40:42,379 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 19:40:42,379 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 19:40:42,379 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 19:40:42,380 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 19:40:42,380 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 19:40:42,381 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 19:40:42,381 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 19:40:42,381 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 19:40:42,382 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 19:40:42,384 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 19:40:42,384 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 19:40:42,384 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 19:40:42,384 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 19:40:42,385 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 19:40:42,385 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 19:40:42,385 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 19:40:42,386 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 19:40:42,386 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 19:40:42,387 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 19:40:42,388 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 19:40:42,388 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 19:40:42,388 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 19:40:42,389 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 19:40:42,389 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 19:40:42,389 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 19:40:42,389 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 19:40:42,390 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 19:40:42,390 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_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4548c451706b7658e6a882e8eef66dc3c360e6aea0e4326d7cc0b87e2b58239c [2022-11-16 19:40:42,730 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 19:40:42,779 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 19:40:42,786 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 19:40:42,787 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 19:40:42,789 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 19:40:42,790 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c [2022-11-16 19:40:42,905 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/data/7c762eae3/2d57a082b12345fea2c263ae2c913553/FLAG5bb6ded18 [2022-11-16 19:40:43,614 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 19:40:43,615 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c [2022-11-16 19:40:43,636 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/data/7c762eae3/2d57a082b12345fea2c263ae2c913553/FLAG5bb6ded18 [2022-11-16 19:40:43,965 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/data/7c762eae3/2d57a082b12345fea2c263ae2c913553 [2022-11-16 19:40:43,969 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 19:40:43,973 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 19:40:43,981 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 19:40:43,981 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 19:40:43,986 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 19:40:43,988 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 07:40:43" (1/1) ... [2022-11-16 19:40:43,990 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75e33880 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:43, skipping insertion in model container [2022-11-16 19:40:43,991 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 07:40:43" (1/1) ... [2022-11-16 19:40:44,001 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 19:40:44,020 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 19:40:44,283 WARN L229 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_25deb496-df68-4224-b6ea-0a1a71c1438f/sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c[318,331] [2022-11-16 19:40:44,298 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 19:40:44,310 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 19:40:44,326 WARN L229 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_25deb496-df68-4224-b6ea-0a1a71c1438f/sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c[318,331] [2022-11-16 19:40:44,330 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 19:40:44,347 INFO L208 MainTranslator]: Completed translation [2022-11-16 19:40:44,348 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44 WrapperNode [2022-11-16 19:40:44,348 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 19:40:44,350 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 19:40:44,350 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 19:40:44,350 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 19:40:44,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,369 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,388 INFO L138 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 47 [2022-11-16 19:40:44,388 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 19:40:44,389 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 19:40:44,390 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 19:40:44,390 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 19:40:44,402 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,402 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,404 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,404 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,407 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,412 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,413 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,415 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,416 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 19:40:44,418 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 19:40:44,418 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 19:40:44,418 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 19:40:44,419 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (1/1) ... [2022-11-16 19:40:44,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 19:40:44,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:40:44,461 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 19:40:44,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 19:40:44,522 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 19:40:44,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 19:40:44,522 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 19:40:44,522 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 19:40:44,610 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 19:40:44,613 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 19:40:44,851 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 19:40:44,899 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 19:40:44,899 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-16 19:40:44,903 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 07:40:44 BoogieIcfgContainer [2022-11-16 19:40:44,903 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 19:40:44,906 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 19:40:44,906 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 19:40:44,911 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 19:40:44,912 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 07:40:43" (1/3) ... [2022-11-16 19:40:44,913 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fe3e75a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 07:40:44, skipping insertion in model container [2022-11-16 19:40:44,913 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:40:44" (2/3) ... [2022-11-16 19:40:44,913 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fe3e75a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 07:40:44, skipping insertion in model container [2022-11-16 19:40:44,914 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 07:40:44" (3/3) ... [2022-11-16 19:40:44,915 INFO L112 eAbstractionObserver]: Analyzing ICFG mono-crafted_3.c [2022-11-16 19:40:44,955 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 19:40:44,956 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-16 19:40:45,035 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 19:40:45,044 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;@49133041, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 19:40:45,045 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-16 19:40:45,051 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:45,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-16 19:40:45,059 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:40:45,060 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-16 19:40:45,061 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:40:45,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:40:45,068 INFO L85 PathProgramCache]: Analyzing trace with hash 72679630, now seen corresponding path program 1 times [2022-11-16 19:40:45,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:40:45,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361732102] [2022-11-16 19:40:45,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:40:45,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:40:45,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:45,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:40:45,474 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:40:45,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361732102] [2022-11-16 19:40:45,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361732102] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:40:45,479 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:40:45,479 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-16 19:40:45,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261919257] [2022-11-16 19:40:45,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:40:45,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 19:40:45,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:40:45,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 19:40:45,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:40:45,547 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:45,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:40:45,626 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2022-11-16 19:40:45,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 19:40:45,630 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-16 19:40:45,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:40:45,644 INFO L225 Difference]: With dead ends: 15 [2022-11-16 19:40:45,644 INFO L226 Difference]: Without dead ends: 7 [2022-11-16 19:40:45,648 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 19:40:45,659 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:40:45,662 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 19:40:45,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2022-11-16 19:40:45,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2022-11-16 19:40:45,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:45,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2022-11-16 19:40:45,721 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2022-11-16 19:40:45,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:40:45,721 INFO L495 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2022-11-16 19:40:45,723 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:45,723 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2022-11-16 19:40:45,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-16 19:40:45,724 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:40:45,724 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-16 19:40:45,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-16 19:40:45,725 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:40:45,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:40:45,731 INFO L85 PathProgramCache]: Analyzing trace with hash -2040007543, now seen corresponding path program 1 times [2022-11-16 19:40:45,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:40:45,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072769363] [2022-11-16 19:40:45,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:40:45,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:40:45,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:45,882 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:40:45,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:40:45,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072769363] [2022-11-16 19:40:45,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072769363] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:40:45,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249877726] [2022-11-16 19:40:45,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:40:45,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:45,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:40:45,890 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:40:45,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 19:40:45,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:45,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-16 19:40:45,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:40:46,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:40:46,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:40:46,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:40:46,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [249877726] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-16 19:40:46,244 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-16 19:40:46,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2022-11-16 19:40:46,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789148220] [2022-11-16 19:40:46,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:40:46,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-16 19:40:46,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:40:46,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-16 19:40:46,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-11-16 19:40:46,249 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:46,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:40:46,271 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2022-11-16 19:40:46,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 19:40:46,272 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-16 19:40:46,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:40:46,273 INFO L225 Difference]: With dead ends: 11 [2022-11-16 19:40:46,273 INFO L226 Difference]: Without dead ends: 8 [2022-11-16 19:40:46,274 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-11-16 19:40:46,275 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:40:46,276 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 6 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:40:46,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2022-11-16 19:40:46,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2022-11-16 19:40:46,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:46,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2022-11-16 19:40:46,281 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2022-11-16 19:40:46,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:40:46,281 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2022-11-16 19:40:46,282 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:46,282 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2022-11-16 19:40:46,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-16 19:40:46,283 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:40:46,283 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:40:46,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-16 19:40:46,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:46,491 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:40:46,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:40:46,491 INFO L85 PathProgramCache]: Analyzing trace with hash 1183634595, now seen corresponding path program 1 times [2022-11-16 19:40:46,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:40:46,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432821079] [2022-11-16 19:40:46,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:40:46,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:40:46,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:46,663 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 19:40:46,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:40:46,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432821079] [2022-11-16 19:40:46,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432821079] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:40:46,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027380981] [2022-11-16 19:40:46,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:40:46,665 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:46,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:40:46,674 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:40:46,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 19:40:46,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:46,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-16 19:40:46,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:40:46,829 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:40:46,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:40:46,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 19:40:46,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027380981] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:40:46,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [812494808] [2022-11-16 19:40:46,983 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-16 19:40:46,983 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:40:46,991 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:40:46,998 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:40:46,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:40:47,611 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:40:47,837 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '156#(and (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (< 0 |ULTIMATE.start_main_~y~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2022-11-16 19:40:47,838 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:40:47,838 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:40:47,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 4, 4] total 9 [2022-11-16 19:40:47,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160869415] [2022-11-16 19:40:47,839 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:40:47,839 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-16 19:40:47,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:40:47,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-16 19:40:47,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2022-11-16 19:40:47,841 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:47,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:40:47,933 INFO L93 Difference]: Finished difference Result 17 states and 22 transitions. [2022-11-16 19:40:47,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-16 19:40:47,935 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-16 19:40:47,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:40:47,936 INFO L225 Difference]: With dead ends: 17 [2022-11-16 19:40:47,936 INFO L226 Difference]: Without dead ends: 12 [2022-11-16 19:40:47,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2022-11-16 19:40:47,943 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:40:47,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 12 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:40:47,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-16 19:40:47,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-11-16 19:40:47,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:47,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2022-11-16 19:40:47,957 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 7 [2022-11-16 19:40:47,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:40:47,958 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2022-11-16 19:40:47,958 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:47,958 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2022-11-16 19:40:47,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-16 19:40:47,961 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:40:47,961 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2022-11-16 19:40:47,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-16 19:40:48,168 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:48,169 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:40:48,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:40:48,170 INFO L85 PathProgramCache]: Analyzing trace with hash -1164749778, now seen corresponding path program 2 times [2022-11-16 19:40:48,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:40:48,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457172597] [2022-11-16 19:40:48,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:40:48,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:40:48,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:48,431 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:48,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:40:48,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457172597] [2022-11-16 19:40:48,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457172597] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:40:48,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109784768] [2022-11-16 19:40:48,436 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:40:48,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:48,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:40:48,439 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:40:48,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 19:40:48,519 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-16 19:40:48,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:40:48,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-16 19:40:48,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:40:48,554 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:48,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:40:48,663 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:48,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109784768] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:40:48,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1150899152] [2022-11-16 19:40:48,676 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-16 19:40:48,677 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:40:48,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:40:48,678 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:40:48,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:40:49,126 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:40:49,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '280#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (< 0 |ULTIMATE.start_main_~y~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2022-11-16 19:40:49,281 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:40:49,282 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:40:49,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2022-11-16 19:40:49,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628166874] [2022-11-16 19:40:49,286 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:40:49,288 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-16 19:40:49,288 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:40:49,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-16 19:40:49,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2022-11-16 19:40:49,291 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:49,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:40:49,335 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2022-11-16 19:40:49,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-16 19:40:49,342 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-16 19:40:49,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:40:49,343 INFO L225 Difference]: With dead ends: 24 [2022-11-16 19:40:49,344 INFO L226 Difference]: Without dead ends: 16 [2022-11-16 19:40:49,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2022-11-16 19:40:49,349 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:40:49,351 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:40:49,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-16 19:40:49,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-16 19:40:49,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:49,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-11-16 19:40:49,360 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2022-11-16 19:40:49,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:40:49,361 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-11-16 19:40:49,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:49,361 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-11-16 19:40:49,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-16 19:40:49,362 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:40:49,362 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1] [2022-11-16 19:40:49,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-16 19:40:49,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:49,569 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:40:49,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:40:49,570 INFO L85 PathProgramCache]: Analyzing trace with hash -2014061842, now seen corresponding path program 3 times [2022-11-16 19:40:49,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:40:49,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552338295] [2022-11-16 19:40:49,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:40:49,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:40:49,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:49,955 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:49,955 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:40:49,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552338295] [2022-11-16 19:40:49,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552338295] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:40:49,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852989852] [2022-11-16 19:40:49,956 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:40:49,957 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:49,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:40:49,958 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:40:49,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 19:40:50,041 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:40:50,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:40:50,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-16 19:40:50,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:40:50,094 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:50,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:40:50,414 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:50,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852989852] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:40:50,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1489586440] [2022-11-16 19:40:50,419 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-16 19:40:50,419 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:40:50,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:40:50,420 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:40:50,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:40:50,764 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:40:50,922 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '454#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (< 0 |ULTIMATE.start_main_~y~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2022-11-16 19:40:50,922 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:40:50,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:40:50,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 16 [2022-11-16 19:40:50,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490741015] [2022-11-16 19:40:50,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:40:50,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-16 19:40:50,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:40:50,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-16 19:40:50,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=272, Unknown=0, NotChecked=0, Total=420 [2022-11-16 19:40:50,925 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:50,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:40:50,979 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2022-11-16 19:40:50,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-16 19:40:50,980 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-16 19:40:50,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:40:50,981 INFO L225 Difference]: With dead ends: 32 [2022-11-16 19:40:50,981 INFO L226 Difference]: Without dead ends: 24 [2022-11-16 19:40:50,982 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=148, Invalid=272, Unknown=0, NotChecked=0, Total=420 [2022-11-16 19:40:50,983 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:40:50,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:40:50,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-16 19:40:50,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-16 19:40:50,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:50,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-11-16 19:40:50,991 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 15 [2022-11-16 19:40:50,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:40:50,991 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-11-16 19:40:50,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:50,992 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-11-16 19:40:50,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-16 19:40:50,993 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:40:50,993 INFO L195 NwaCegarLoop]: trace histogram [14, 4, 1, 1, 1, 1, 1] [2022-11-16 19:40:51,000 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-16 19:40:51,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:51,200 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:40:51,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:40:51,201 INFO L85 PathProgramCache]: Analyzing trace with hash -2097100690, now seen corresponding path program 4 times [2022-11-16 19:40:51,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:40:51,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519714238] [2022-11-16 19:40:51,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:40:51,201 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:40:51,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:52,006 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:52,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:40:52,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519714238] [2022-11-16 19:40:52,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519714238] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:40:52,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584521589] [2022-11-16 19:40:52,007 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:40:52,008 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:52,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:40:52,011 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:40:52,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-16 19:40:52,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:52,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-16 19:40:52,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:40:52,202 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:52,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:40:53,129 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:53,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584521589] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:40:53,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1213920050] [2022-11-16 19:40:53,132 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-16 19:40:53,133 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:40:53,133 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:40:53,139 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:40:53,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:40:53,415 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:40:53,598 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '724#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (< 0 |ULTIMATE.start_main_~y~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2022-11-16 19:40:53,598 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:40:53,599 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:40:53,599 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 32 [2022-11-16 19:40:53,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271123277] [2022-11-16 19:40:53,599 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:40:53,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-16 19:40:53,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:40:53,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-16 19:40:53,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=792, Unknown=0, NotChecked=0, Total=1332 [2022-11-16 19:40:53,602 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:53,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:40:53,707 INFO L93 Difference]: Finished difference Result 48 states and 65 transitions. [2022-11-16 19:40:53,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-16 19:40:53,708 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-16 19:40:53,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:40:53,709 INFO L225 Difference]: With dead ends: 48 [2022-11-16 19:40:53,709 INFO L226 Difference]: Without dead ends: 40 [2022-11-16 19:40:53,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=540, Invalid=792, Unknown=0, NotChecked=0, Total=1332 [2022-11-16 19:40:53,711 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:40:53,711 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 19:40:53,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-16 19:40:53,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-16 19:40:53,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:53,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-11-16 19:40:53,721 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 23 [2022-11-16 19:40:53,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:40:53,721 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-11-16 19:40:53,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:40:53,722 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-11-16 19:40:53,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-16 19:40:53,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:40:53,723 INFO L195 NwaCegarLoop]: trace histogram [30, 4, 1, 1, 1, 1, 1] [2022-11-16 19:40:53,733 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-16 19:40:53,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-16 19:40:53,930 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:40:53,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:40:53,931 INFO L85 PathProgramCache]: Analyzing trace with hash 696918894, now seen corresponding path program 5 times [2022-11-16 19:40:53,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:40:53,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844180952] [2022-11-16 19:40:53,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:40:53,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:40:53,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:40:56,564 INFO L134 CoverageAnalysis]: Checked inductivity of 475 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:56,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:40:56,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844180952] [2022-11-16 19:40:56,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844180952] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:40:56,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176575017] [2022-11-16 19:40:56,565 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:40:56,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:40:56,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:40:56,567 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:40:56,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-16 19:40:56,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-16 19:40:56,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:40:56,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-16 19:40:56,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:40:56,941 INFO L134 CoverageAnalysis]: Checked inductivity of 475 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:56,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:40:59,636 INFO L134 CoverageAnalysis]: Checked inductivity of 475 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:40:59,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [176575017] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:40:59,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1410310277] [2022-11-16 19:40:59,638 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-16 19:40:59,638 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:40:59,639 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:40:59,639 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:40:59,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:40:59,896 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:41:00,122 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1186#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (< 0 |ULTIMATE.start_main_~y~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2022-11-16 19:41:00,125 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:41:00,126 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:41:00,126 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 64 [2022-11-16 19:41:00,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927456655] [2022-11-16 19:41:00,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:41:00,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-16 19:41:00,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:41:00,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-16 19:41:00,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2092, Invalid=2600, Unknown=0, NotChecked=0, Total=4692 [2022-11-16 19:41:00,140 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:41:00,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:41:00,362 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2022-11-16 19:41:00,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-16 19:41:00,363 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-11-16 19:41:00,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:41:00,368 INFO L225 Difference]: With dead ends: 80 [2022-11-16 19:41:00,368 INFO L226 Difference]: Without dead ends: 72 [2022-11-16 19:41:00,371 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2092, Invalid=2600, Unknown=0, NotChecked=0, Total=4692 [2022-11-16 19:41:00,373 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:41:00,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 19:41:00,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-16 19:41:00,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2022-11-16 19:41:00,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:41:00,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-11-16 19:41:00,408 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 39 [2022-11-16 19:41:00,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:41:00,409 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-11-16 19:41:00,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:41:00,410 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-11-16 19:41:00,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-16 19:41:00,416 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:41:00,417 INFO L195 NwaCegarLoop]: trace histogram [62, 4, 1, 1, 1, 1, 1] [2022-11-16 19:41:00,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-16 19:41:00,625 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:41:00,626 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:41:00,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:41:00,627 INFO L85 PathProgramCache]: Analyzing trace with hash -228927122, now seen corresponding path program 6 times [2022-11-16 19:41:00,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:41:00,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172497216] [2022-11-16 19:41:00,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:41:00,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:41:00,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:41:08,819 INFO L134 CoverageAnalysis]: Checked inductivity of 1963 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:41:08,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:41:08,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172497216] [2022-11-16 19:41:08,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172497216] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:41:08,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177391886] [2022-11-16 19:41:08,821 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:41:08,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:41:08,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:41:08,823 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:41:08,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-16 19:41:08,977 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:41:08,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:41:08,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-16 19:41:09,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:41:09,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1963 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:41:09,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:41:17,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1963 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:41:17,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177391886] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:41:17,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1797613293] [2022-11-16 19:41:17,844 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-16 19:41:17,845 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:41:17,845 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:41:17,845 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:41:17,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:41:18,065 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:41:18,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2032#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (< 0 |ULTIMATE.start_main_~y~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2022-11-16 19:41:18,391 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:41:18,391 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:41:18,392 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 128 [2022-11-16 19:41:18,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878518630] [2022-11-16 19:41:18,392 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:41:18,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-11-16 19:41:18,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:41:18,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-11-16 19:41:18,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8268, Invalid=9288, Unknown=0, NotChecked=0, Total=17556 [2022-11-16 19:41:18,407 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 129 states, 129 states have (on average 1.0387596899224807) internal successors, (134), 128 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:41:18,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:41:18,883 INFO L93 Difference]: Finished difference Result 144 states and 209 transitions. [2022-11-16 19:41:18,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2022-11-16 19:41:18,884 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.0387596899224807) internal successors, (134), 128 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2022-11-16 19:41:18,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:41:18,886 INFO L225 Difference]: With dead ends: 144 [2022-11-16 19:41:18,887 INFO L226 Difference]: Without dead ends: 136 [2022-11-16 19:41:18,895 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=8268, Invalid=9288, Unknown=0, NotChecked=0, Total=17556 [2022-11-16 19:41:18,895 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 19:41:18,896 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 19:41:18,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-16 19:41:18,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2022-11-16 19:41:18,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:41:18,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2022-11-16 19:41:18,932 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 71 [2022-11-16 19:41:18,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:41:18,936 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2022-11-16 19:41:18,936 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.0387596899224807) internal successors, (134), 128 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:41:18,936 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2022-11-16 19:41:18,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-11-16 19:41:18,941 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:41:18,942 INFO L195 NwaCegarLoop]: trace histogram [126, 4, 1, 1, 1, 1, 1] [2022-11-16 19:41:18,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-16 19:41:19,149 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:41:19,149 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:41:19,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:41:19,150 INFO L85 PathProgramCache]: Analyzing trace with hash 1123304814, now seen corresponding path program 7 times [2022-11-16 19:41:19,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:41:19,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684772218] [2022-11-16 19:41:19,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:41:19,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:41:19,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:41:42,756 INFO L134 CoverageAnalysis]: Checked inductivity of 8011 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:41:42,756 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:41:42,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684772218] [2022-11-16 19:41:42,756 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684772218] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:41:42,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092529859] [2022-11-16 19:41:42,757 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:41:42,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:41:42,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:41:42,758 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:41:42,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-16 19:41:42,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:41:42,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 128 conjunts are in the unsatisfiable core [2022-11-16 19:41:42,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:41:43,596 INFO L134 CoverageAnalysis]: Checked inductivity of 8011 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:41:43,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:42:11,235 INFO L134 CoverageAnalysis]: Checked inductivity of 8011 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:42:11,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092529859] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:42:11,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [28421228] [2022-11-16 19:42:11,237 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-16 19:42:11,238 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:42:11,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:42:11,238 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:42:11,239 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:42:11,424 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:42:11,938 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3646#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (< 0 |ULTIMATE.start_main_~y~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2022-11-16 19:42:11,938 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:42:11,939 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:42:11,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [128, 128, 128] total 256 [2022-11-16 19:42:11,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013369151] [2022-11-16 19:42:11,939 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:42:11,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 257 states [2022-11-16 19:42:11,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:42:11,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 257 interpolants. [2022-11-16 19:42:11,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32908, Invalid=34952, Unknown=0, NotChecked=0, Total=67860 [2022-11-16 19:42:11,965 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 257 states, 257 states have (on average 1.0194552529182879) internal successors, (262), 256 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:42:13,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:42:13,281 INFO L93 Difference]: Finished difference Result 272 states and 401 transitions. [2022-11-16 19:42:13,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 256 states. [2022-11-16 19:42:13,282 INFO L78 Accepts]: Start accepts. Automaton has has 257 states, 257 states have (on average 1.0194552529182879) internal successors, (262), 256 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 135 [2022-11-16 19:42:13,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:42:13,292 INFO L225 Difference]: With dead ends: 272 [2022-11-16 19:42:13,292 INFO L226 Difference]: Without dead ends: 264 [2022-11-16 19:42:13,298 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2029 ImplicationChecksByTransitivity, 33.8s TimeCoverageRelationStatistics Valid=32908, Invalid=34952, Unknown=0, NotChecked=0, Total=67860 [2022-11-16 19:42:13,301 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 19:42:13,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 19:42:13,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2022-11-16 19:42:13,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 264. [2022-11-16 19:42:13,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 263 states have (on average 1.0076045627376427) internal successors, (265), 263 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:42:13,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 265 transitions. [2022-11-16 19:42:13,345 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 265 transitions. Word has length 135 [2022-11-16 19:42:13,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:42:13,345 INFO L495 AbstractCegarLoop]: Abstraction has 264 states and 265 transitions. [2022-11-16 19:42:13,346 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 257 states, 257 states have (on average 1.0194552529182879) internal successors, (262), 256 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:42:13,346 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 265 transitions. [2022-11-16 19:42:13,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2022-11-16 19:42:13,350 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:42:13,350 INFO L195 NwaCegarLoop]: trace histogram [254, 4, 1, 1, 1, 1, 1] [2022-11-16 19:42:13,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-16 19:42:13,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:42:13,559 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:42:13,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:42:13,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1611079022, now seen corresponding path program 8 times [2022-11-16 19:42:13,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:42:13,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731482889] [2022-11-16 19:42:13,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:42:13,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:42:14,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:48,101 INFO L134 CoverageAnalysis]: Checked inductivity of 32395 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:43:48,102 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:48,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731482889] [2022-11-16 19:43:48,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731482889] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:48,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539694447] [2022-11-16 19:43:48,103 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:43:48,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:48,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:48,105 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:48,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-16 19:43:49,625 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 128 check-sat command(s) [2022-11-16 19:43:49,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:43:49,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 576 conjuncts, 256 conjunts are in the unsatisfiable core [2022-11-16 19:43:49,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:50,760 INFO L134 CoverageAnalysis]: Checked inductivity of 32395 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:43:50,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:45:35,131 INFO L134 CoverageAnalysis]: Checked inductivity of 32395 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:45:35,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539694447] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:45:35,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2108084222] [2022-11-16 19:45:35,134 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-16 19:45:35,135 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:45:35,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:45:35,135 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:45:35,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:45:35,344 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:45:36,161 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6796#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (< 0 |ULTIMATE.start_main_~y~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2022-11-16 19:45:36,161 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 19:45:36,162 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:45:36,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [256, 256, 256] total 512 [2022-11-16 19:45:36,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723327619] [2022-11-16 19:45:36,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:45:36,164 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 513 states [2022-11-16 19:45:36,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:45:36,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 513 interpolants. [2022-11-16 19:45:36,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131340, Invalid=135432, Unknown=0, NotChecked=0, Total=266772 [2022-11-16 19:45:36,197 INFO L87 Difference]: Start difference. First operand 264 states and 265 transitions. Second operand has 513 states, 513 states have (on average 1.0097465886939572) internal successors, (518), 512 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:45:42,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:45:42,291 INFO L93 Difference]: Finished difference Result 528 states and 785 transitions. [2022-11-16 19:45:42,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 512 states. [2022-11-16 19:45:42,293 INFO L78 Accepts]: Start accepts. Automaton has has 513 states, 513 states have (on average 1.0097465886939572) internal successors, (518), 512 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 263 [2022-11-16 19:45:42,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:45:42,296 INFO L225 Difference]: With dead ends: 528 [2022-11-16 19:45:42,296 INFO L226 Difference]: Without dead ends: 520 [2022-11-16 19:45:42,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1043 GetRequests, 528 SyntacticMatches, 0 SemanticMatches, 515 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4077 ImplicationChecksByTransitivity, 136.4s TimeCoverageRelationStatistics Valid=131340, Invalid=135432, Unknown=0, NotChecked=0, Total=266772 [2022-11-16 19:45:42,308 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 554 mSolverCounterSat, 261 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 815 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 261 IncrementalHoareTripleChecker+Valid, 554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 19:45:42,309 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 815 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [261 Valid, 554 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-16 19:45:42,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2022-11-16 19:45:42,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 520. [2022-11-16 19:45:42,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 519 states have (on average 1.0038535645472062) internal successors, (521), 519 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:45:42,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 521 transitions. [2022-11-16 19:45:42,354 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 521 transitions. Word has length 263 [2022-11-16 19:45:42,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:45:42,355 INFO L495 AbstractCegarLoop]: Abstraction has 520 states and 521 transitions. [2022-11-16 19:45:42,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 513 states, 513 states have (on average 1.0097465886939572) internal successors, (518), 512 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:45:42,356 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 521 transitions. [2022-11-16 19:45:42,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 520 [2022-11-16 19:45:42,365 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:45:42,365 INFO L195 NwaCegarLoop]: trace histogram [510, 4, 1, 1, 1, 1, 1] [2022-11-16 19:45:42,376 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-16 19:45:42,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-16 19:45:42,575 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:45:42,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:45:42,576 INFO L85 PathProgramCache]: Analyzing trace with hash -1985163922, now seen corresponding path program 9 times [2022-11-16 19:45:42,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:45:42,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346510702] [2022-11-16 19:45:42,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:45:42,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:45:44,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:51:44,948 INFO L134 CoverageAnalysis]: Checked inductivity of 130315 backedges. 0 proven. 130305 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:51:44,948 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:51:44,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346510702] [2022-11-16 19:51:44,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346510702] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:51:44,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860736179] [2022-11-16 19:51:44,949 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:51:44,949 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:51:44,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:51:44,954 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:51:44,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25deb496-df68-4224-b6ea-0a1a71c1438f/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-16 19:51:45,577 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:51:45,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:51:45,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 1088 conjuncts, 512 conjunts are in the unsatisfiable core [2022-11-16 19:51:45,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:51:47,529 INFO L134 CoverageAnalysis]: Checked inductivity of 130315 backedges. 0 proven. 130305 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:51:47,529 INFO L328 TraceCheckSpWp]: Computing backward predicates...