./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.6.ufo.BOUNDED-12.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.6.ufo.BOUNDED-12.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8 --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 65159196aa732cf84d788dcb31500c216d665703806e14a7c6f7047ab62d591b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:59:40,988 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:59:40,991 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:59:41,048 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:59:41,049 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:59:41,053 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:59:41,056 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:59:41,060 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:59:41,063 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:59:41,068 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:59:41,070 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:59:41,072 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:59:41,072 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:59:41,075 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:59:41,077 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:59:41,082 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:59:41,084 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:59:41,085 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:59:41,088 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:59:41,096 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:59:41,098 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:59:41,100 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:59:41,103 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:59:41,104 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:59:41,110 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:59:41,111 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:59:41,111 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:59:41,112 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:59:41,113 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:59:41,114 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:59:41,114 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:59:41,115 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:59:41,116 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:59:41,117 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:59:41,118 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:59:41,119 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:59:41,120 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:59:41,120 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:59:41,120 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:59:41,121 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:59:41,122 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:59:41,123 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:59:41,147 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:59:41,148 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:59:41,149 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:59:41,149 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:59:41,149 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:59:41,149 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:59:41,149 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:59:41,150 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:59:41,150 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:59:41,150 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:59:41,150 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:59:41,151 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:59:41,151 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:59:41,151 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:59:41,151 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:59:41,152 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:59:41,152 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:59:41,152 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:59:41,153 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:59:41,153 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:59:41,153 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:59:41,153 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:59:41,154 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:59:41,154 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:59:41,154 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:59:41,154 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:59:41,154 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:59:41,155 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:59:41,155 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:59:41,155 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:59:41,155 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:59:41,156 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:59:41,156 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:59:41,156 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:59:41,156 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:59:41,156 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:59:41,157 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:59:41,157 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:59:41,157 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:59:41,157 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 65159196aa732cf84d788dcb31500c216d665703806e14a7c6f7047ab62d591b [2021-11-07 01:59:41,410 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:59:41,443 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:59:41,445 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:59:41,447 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:59:41,447 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:59:41,448 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.6.ufo.BOUNDED-12.pals.c [2021-11-07 01:59:41,525 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/data/ee872491e/4ef456382a6147708d11786c0b0a404c/FLAGccaebfdc3 [2021-11-07 01:59:42,044 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:59:42,045 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/sv-benchmarks/c/seq-mthreaded/pals_lcr.6.ufo.BOUNDED-12.pals.c [2021-11-07 01:59:42,063 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/data/ee872491e/4ef456382a6147708d11786c0b0a404c/FLAGccaebfdc3 [2021-11-07 01:59:42,395 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/data/ee872491e/4ef456382a6147708d11786c0b0a404c [2021-11-07 01:59:42,398 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:59:42,399 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:59:42,400 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:59:42,401 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:59:42,418 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:59:42,418 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,421 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2193cc81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42, skipping insertion in model container [2021-11-07 01:59:42,421 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,427 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:59:42,468 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:59:42,703 WARN L228 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_e07f040b-f726-4e37-8e5e-6669f826d576/sv-benchmarks/c/seq-mthreaded/pals_lcr.6.ufo.BOUNDED-12.pals.c[15075,15088] [2021-11-07 01:59:42,706 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:59:42,715 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:59:42,773 WARN L228 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_e07f040b-f726-4e37-8e5e-6669f826d576/sv-benchmarks/c/seq-mthreaded/pals_lcr.6.ufo.BOUNDED-12.pals.c[15075,15088] [2021-11-07 01:59:42,774 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:59:42,790 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:59:42,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42 WrapperNode [2021-11-07 01:59:42,791 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:59:42,792 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:59:42,792 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:59:42,793 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:59:42,800 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,811 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,848 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:59:42,848 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:59:42,849 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:59:42,849 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:59:42,857 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,865 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,870 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,870 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,880 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,900 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,915 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,920 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:59:42,921 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:59:42,925 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:59:42,925 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:59:42,926 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (1/1) ... [2021-11-07 01:59:42,934 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:59:42,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:59:42,965 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:59:42,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:59:43,004 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:59:43,005 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:59:43,007 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:59:43,008 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:59:45,612 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:59:45,612 INFO L299 CfgBuilder]: Removed 25 assume(true) statements. [2021-11-07 01:59:45,614 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:59:45 BoogieIcfgContainer [2021-11-07 01:59:45,615 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:59:45,617 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:59:45,617 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:59:45,621 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:59:45,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:59:42" (1/3) ... [2021-11-07 01:59:45,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38e7baa5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:59:45, skipping insertion in model container [2021-11-07 01:59:45,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:59:42" (2/3) ... [2021-11-07 01:59:45,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38e7baa5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:59:45, skipping insertion in model container [2021-11-07 01:59:45,623 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:59:45" (3/3) ... [2021-11-07 01:59:45,626 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.6.ufo.BOUNDED-12.pals.c [2021-11-07 01:59:45,631 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:59:45,631 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:59:45,671 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:59:45,677 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 01:59:45,677 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:59:45,690 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:59:45,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-07 01:59:45,704 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:59:45,704 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-07 01:59:45,705 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:59:45,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:59:45,711 INFO L85 PathProgramCache]: Analyzing trace with hash -540225612, now seen corresponding path program 1 times [2021-11-07 01:59:45,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:59:45,720 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258929468] [2021-11-07 01:59:45,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:59:45,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:59:46,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:46,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:59:46,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:59:46,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258929468] [2021-11-07 01:59:46,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258929468] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:59:46,284 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:59:46,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:59:46,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987499716] [2021-11-07 01:59:46,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:59:46,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:59:46,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:59:46,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:59:46,304 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) 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) [2021-11-07 01:59:46,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:59:46,369 INFO L93 Difference]: Finished difference Result 36 states and 48 transitions. [2021-11-07 01:59:46,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:59:46,371 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 [2021-11-07 01:59:46,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:59:46,379 INFO L225 Difference]: With dead ends: 36 [2021-11-07 01:59:46,379 INFO L226 Difference]: Without dead ends: 22 [2021-11-07 01:59:46,382 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:59:46,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-07 01:59:46,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 13. [2021-11-07 01:59:46,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:59:46,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2021-11-07 01:59:46,407 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2021-11-07 01:59:46,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:59:46,407 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2021-11-07 01:59:46,408 INFO L471 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) [2021-11-07 01:59:46,408 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2021-11-07 01:59:46,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-07 01:59:46,408 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:59:46,409 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:59:46,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:59:46,409 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:59:46,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:59:46,410 INFO L85 PathProgramCache]: Analyzing trace with hash -220735326, now seen corresponding path program 1 times [2021-11-07 01:59:46,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:59:46,410 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10992743] [2021-11-07 01:59:46,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:59:46,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:59:46,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:46,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:59:46,621 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:59:46,622 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10992743] [2021-11-07 01:59:46,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10992743] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:59:46,622 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:59:46,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:59:46,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773929075] [2021-11-07 01:59:46,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:59:46,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:59:46,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:59:46,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:59:46,626 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2021-11-07 01:59:46,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:59:46,670 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-11-07 01:59:46,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:59:46,671 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) Word has length 8 [2021-11-07 01:59:46,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:59:46,672 INFO L225 Difference]: With dead ends: 32 [2021-11-07 01:59:46,672 INFO L226 Difference]: Without dead ends: 22 [2021-11-07 01:59:46,673 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:59:46,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-07 01:59:46,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 14. [2021-11-07 01:59:46,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 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) [2021-11-07 01:59:46,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-11-07 01:59:46,678 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8 [2021-11-07 01:59:46,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:59:46,678 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-11-07 01:59:46,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2021-11-07 01:59:46,679 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-11-07 01:59:46,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-07 01:59:46,679 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:59:46,680 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:59:46,680 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 01:59:46,680 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:59:46,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:59:46,681 INFO L85 PathProgramCache]: Analyzing trace with hash -220556580, now seen corresponding path program 1 times [2021-11-07 01:59:46,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:59:46,682 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747771137] [2021-11-07 01:59:46,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:59:46,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:59:46,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:46,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:59:46,913 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:59:46,913 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747771137] [2021-11-07 01:59:46,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747771137] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:59:46,914 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:59:46,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:59:46,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681714466] [2021-11-07 01:59:46,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:59:46,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:59:46,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:59:46,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:59:46,917 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2021-11-07 01:59:46,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:59:46,974 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2021-11-07 01:59:46,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:59:46,975 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) Word has length 8 [2021-11-07 01:59:46,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:59:46,976 INFO L225 Difference]: With dead ends: 32 [2021-11-07 01:59:46,976 INFO L226 Difference]: Without dead ends: 22 [2021-11-07 01:59:46,977 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:59:46,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-07 01:59:46,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 15. [2021-11-07 01:59:46,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 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) [2021-11-07 01:59:46,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-07 01:59:46,981 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 8 [2021-11-07 01:59:46,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:59:46,982 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-07 01:59:46,982 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2021-11-07 01:59:46,982 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-07 01:59:46,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-07 01:59:46,983 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:59:46,983 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:59:46,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 01:59:46,983 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:59:46,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:59:46,984 INFO L85 PathProgramCache]: Analyzing trace with hash 1740689688, now seen corresponding path program 1 times [2021-11-07 01:59:46,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:59:46,985 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974345272] [2021-11-07 01:59:46,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:59:46,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:59:47,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:47,063 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:59:47,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:59:47,064 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974345272] [2021-11-07 01:59:47,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1974345272] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:59:47,065 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:59:47,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 01:59:47,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690552487] [2021-11-07 01:59:47,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:59:47,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:59:47,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:59:47,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:59:47,067 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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) [2021-11-07 01:59:47,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:59:47,168 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-11-07 01:59:47,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:59:47,169 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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) Word has length 9 [2021-11-07 01:59:47,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:59:47,170 INFO L225 Difference]: With dead ends: 36 [2021-11-07 01:59:47,170 INFO L226 Difference]: Without dead ends: 34 [2021-11-07 01:59:47,171 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:59:47,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-07 01:59:47,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 18. [2021-11-07 01:59:47,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 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) [2021-11-07 01:59:47,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-11-07 01:59:47,176 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 9 [2021-11-07 01:59:47,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:59:47,177 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-11-07 01:59:47,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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) [2021-11-07 01:59:47,178 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-11-07 01:59:47,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-07 01:59:47,178 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:59:47,179 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:59:47,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 01:59:47,179 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:59:47,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:59:47,180 INFO L85 PathProgramCache]: Analyzing trace with hash 1906093923, now seen corresponding path program 1 times [2021-11-07 01:59:47,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:59:47,180 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804231806] [2021-11-07 01:59:47,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:59:47,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:59:47,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:49,500 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:59:49,500 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:59:49,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804231806] [2021-11-07 01:59:49,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804231806] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:59:49,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308587878] [2021-11-07 01:59:49,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:59:49,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:59:49,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:59:49,506 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:59:49,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e07f040b-f726-4e37-8e5e-6669f826d576/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 01:59:49,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:49,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-07 01:59:49,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:00:02,658 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:00:02,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:17,490 WARN L207 SmtUtils]: Spent 8.27 s on a formula simplification. DAG size of input: 764 DAG size of output: 759