./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs --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 e6ceef81d5d5c6ec4b435ae3bf6300a70928e11f3a8c1d376463323495e50f12 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 13:26:26,897 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 13:26:26,900 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 13:26:26,942 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 13:26:26,943 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 13:26:26,945 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 13:26:26,947 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 13:26:26,951 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 13:26:26,954 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 13:26:26,956 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 13:26:26,958 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 13:26:26,960 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 13:26:26,961 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 13:26:26,962 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 13:26:26,965 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 13:26:26,967 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 13:26:26,969 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 13:26:26,971 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 13:26:26,975 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 13:26:26,978 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 13:26:26,981 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 13:26:26,984 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 13:26:26,986 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 13:26:26,988 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 13:26:26,993 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 13:26:26,994 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 13:26:26,995 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 13:26:26,997 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 13:26:26,998 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 13:26:27,000 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 13:26:27,001 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 13:26:27,002 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 13:26:27,004 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 13:26:27,005 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 13:26:27,007 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 13:26:27,008 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 13:26:27,009 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 13:26:27,010 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 13:26:27,010 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 13:26:27,012 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 13:26:27,013 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 13:26:27,014 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-19 13:26:27,052 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 13:26:27,052 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 13:26:27,053 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 13:26:27,054 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 13:26:27,054 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 13:26:27,055 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 13:26:27,055 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 13:26:27,056 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 13:26:27,056 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 13:26:27,057 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 13:26:27,057 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 13:26:27,057 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 13:26:27,058 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 13:26:27,058 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 13:26:27,059 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 13:26:27,059 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 13:26:27,060 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 13:26:27,061 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 13:26:27,061 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 13:26:27,062 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 13:26:27,062 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 13:26:27,063 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 13:26:27,063 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 13:26:27,063 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 13:26:27,064 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 13:26:27,064 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 13:26:27,065 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 13:26:27,065 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 13:26:27,066 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 13:26:27,066 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 13:26:27,066 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 13:26:27,067 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:26:27,067 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 13:26:27,068 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 13:26:27,068 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 13:26:27,069 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 13:26:27,069 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 13:26:27,070 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 13:26:27,070 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 13:26:27,070 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 13:26:27,071 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_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e6ceef81d5d5c6ec4b435ae3bf6300a70928e11f3a8c1d376463323495e50f12 [2021-11-19 13:26:27,467 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 13:26:27,501 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 13:26:27,505 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 13:26:27,507 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 13:26:27,509 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 13:26:27,511 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c [2021-11-19 13:26:27,632 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/data/1e1b973c2/4cb8fe5d3af74a3ba4292fa2b726632c/FLAG387b5ef07 [2021-11-19 13:26:28,239 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 13:26:28,240 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c [2021-11-19 13:26:28,247 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/data/1e1b973c2/4cb8fe5d3af74a3ba4292fa2b726632c/FLAG387b5ef07 [2021-11-19 13:26:28,596 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/data/1e1b973c2/4cb8fe5d3af74a3ba4292fa2b726632c [2021-11-19 13:26:28,600 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 13:26:28,602 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 13:26:28,626 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 13:26:28,627 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 13:26:28,631 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 13:26:28,632 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:28,634 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b237f00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28, skipping insertion in model container [2021-11-19 13:26:28,634 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:28,644 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 13:26:28,670 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 13:26:28,887 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[557,570] [2021-11-19 13:26:28,908 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[613,626] [2021-11-19 13:26:28,910 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:26:28,920 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 13:26:28,947 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[557,570] [2021-11-19 13:26:28,949 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[613,626] [2021-11-19 13:26:28,950 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:26:28,973 INFO L208 MainTranslator]: Completed translation [2021-11-19 13:26:28,974 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28 WrapperNode [2021-11-19 13:26:28,974 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 13:26:28,976 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 13:26:28,976 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 13:26:28,977 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 13:26:28,987 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:28,997 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:29,025 INFO L137 Inliner]: procedures = 11, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 38 [2021-11-19 13:26:29,025 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 13:26:29,027 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 13:26:29,027 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 13:26:29,027 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 13:26:29,039 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:29,040 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:29,043 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:29,043 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:29,058 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:29,068 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:29,070 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:29,072 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 13:26:29,073 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 13:26:29,073 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 13:26:29,073 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 13:26:29,078 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (1/1) ... [2021-11-19 13:26:29,088 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:26:29,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:26:29,126 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 13:26:29,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 13:26:29,194 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 13:26:29,194 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 13:26:29,194 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 13:26:29,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 13:26:29,284 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 13:26:29,286 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 13:26:29,468 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 13:26:29,500 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 13:26:29,502 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-19 13:26:29,505 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 01:26:29 BoogieIcfgContainer [2021-11-19 13:26:29,506 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 13:26:29,511 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 13:26:29,511 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 13:26:29,516 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 13:26:29,517 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 01:26:28" (1/3) ... [2021-11-19 13:26:29,518 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fdac9b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 01:26:29, skipping insertion in model container [2021-11-19 13:26:29,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:26:28" (2/3) ... [2021-11-19 13:26:29,519 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fdac9b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 01:26:29, skipping insertion in model container [2021-11-19 13:26:29,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 01:26:29" (3/3) ... [2021-11-19 13:26:29,522 INFO L111 eAbstractionObserver]: Analyzing ICFG linear-inequality-inv-a.c [2021-11-19 13:26:29,534 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 13:26:29,534 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-19 13:26:29,610 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 13:26:29,621 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 [2021-11-19 13:26:29,621 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-19 13:26:29,641 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 8 states have (on average 1.75) internal successors, (14), 10 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) [2021-11-19 13:26:29,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-19 13:26:29,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:26:29,650 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-19 13:26:29,651 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:26:29,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:26:29,659 INFO L85 PathProgramCache]: Analyzing trace with hash 63046149, now seen corresponding path program 1 times [2021-11-19 13:26:29,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:26:29,674 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020666696] [2021-11-19 13:26:29,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:29,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:26:29,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:29,989 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:29,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:26:29,990 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020666696] [2021-11-19 13:26:29,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1020666696] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:26:29,992 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:26:29,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:26:29,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536495573] [2021-11-19 13:26:29,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:26:30,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:26:30,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:26:30,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:26:30,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:26:30,043 INFO L87 Difference]: Start difference. First operand has 11 states, 8 states have (on average 1.75) internal successors, (14), 10 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) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 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) [2021-11-19 13:26:30,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:26:30,087 INFO L93 Difference]: Finished difference Result 20 states and 25 transitions. [2021-11-19 13:26:30,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:26:30,090 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 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 [2021-11-19 13:26:30,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:26:30,102 INFO L225 Difference]: With dead ends: 20 [2021-11-19 13:26:30,102 INFO L226 Difference]: Without dead ends: 10 [2021-11-19 13:26:30,106 INFO L932 BasicCegarLoop]: 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 [2021-11-19 13:26:30,112 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 13:26:30,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 13:26:30,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-19 13:26:30,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-19 13:26:30,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 8 states have (on average 1.25) internal successors, (10), 9 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) [2021-11-19 13:26:30,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2021-11-19 13:26:30,174 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 5 [2021-11-19 13:26:30,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:26:30,175 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2021-11-19 13:26:30,176 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 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) [2021-11-19 13:26:30,176 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2021-11-19 13:26:30,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-19 13:26:30,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:26:30,178 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-19 13:26:30,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 13:26:30,179 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:26:30,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:26:30,181 INFO L85 PathProgramCache]: Analyzing trace with hash 1953761755, now seen corresponding path program 1 times [2021-11-19 13:26:30,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:26:30,182 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800057446] [2021-11-19 13:26:30,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:30,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:26:30,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:30,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:30,343 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:26:30,344 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800057446] [2021-11-19 13:26:30,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [800057446] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:26:30,345 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589995544] [2021-11-19 13:26:30,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:30,346 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:30,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:26:30,358 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:26:30,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 13:26:30,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:30,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-19 13:26:30,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:26:30,552 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:30,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:26:30,761 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:30,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [589995544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:26:30,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1381988249] [2021-11-19 13:26:30,790 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 13:26:30,790 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:26:30,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:26:30,804 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:26:30,805 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:26:30,864 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:30,876 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-19 13:26:30,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:30,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:31,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:31,107 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:31,150 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 199 [2021-11-19 13:26:31,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:31,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:31,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:31,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:31,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:31,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:31,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:31,290 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:26:31,300 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:26:31,314 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:26:31,560 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:26:31,560 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:26:31,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-19 13:26:31,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634671622] [2021-11-19 13:26:31,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:26:31,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 13:26:31,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:26:31,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 13:26:31,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-19 13:26:31,565 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 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) [2021-11-19 13:26:31,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:26:31,699 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-11-19 13:26:31,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-19 13:26:31,701 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 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) Word has length 6 [2021-11-19 13:26:31,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:26:31,702 INFO L225 Difference]: With dead ends: 27 [2021-11-19 13:26:31,702 INFO L226 Difference]: Without dead ends: 21 [2021-11-19 13:26:31,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-11-19 13:26:31,706 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 24 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 13:26:31,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 10 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 13:26:31,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-19 13:26:31,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 14. [2021-11-19 13:26:31,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 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) [2021-11-19 13:26:31,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-11-19 13:26:31,714 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 6 [2021-11-19 13:26:31,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:26:31,715 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-11-19 13:26:31,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 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) [2021-11-19 13:26:31,715 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-11-19 13:26:31,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-19 13:26:31,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:26:31,716 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-19 13:26:31,752 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-19 13:26:31,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-19 13:26:31,937 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:26:31,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:26:31,938 INFO L85 PathProgramCache]: Analyzing trace with hash 643607479, now seen corresponding path program 1 times [2021-11-19 13:26:31,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:26:31,939 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103948459] [2021-11-19 13:26:31,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:31,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:26:31,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:32,143 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:32,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:26:32,144 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103948459] [2021-11-19 13:26:32,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103948459] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:26:32,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246481472] [2021-11-19 13:26:32,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:32,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:32,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:26:32,157 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:26:32,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 13:26:32,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:32,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 13:26:32,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:26:32,481 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:32,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:26:32,768 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:32,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246481472] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:26:32,769 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1523662405] [2021-11-19 13:26:32,778 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-19 13:26:32,791 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:26:32,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:26:32,792 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:26:32,792 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:26:32,807 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:32,819 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 84 [2021-11-19 13:26:32,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:32,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:32,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:32,903 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:32,932 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 199 [2021-11-19 13:26:32,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:32,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:32,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:32,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:32,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:32,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:32,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:33,001 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:26:33,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:26:33,020 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:26:33,280 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:26:33,280 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:26:33,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-19 13:26:33,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961863695] [2021-11-19 13:26:33,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:26:33,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 13:26:33,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:26:33,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 13:26:33,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-19 13:26:33,283 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 8 states, 8 states have (on average 1.75) 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) [2021-11-19 13:26:33,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:26:33,486 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2021-11-19 13:26:33,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-19 13:26:33,487 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) 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 8 [2021-11-19 13:26:33,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:26:33,488 INFO L225 Difference]: With dead ends: 25 [2021-11-19 13:26:33,488 INFO L226 Difference]: Without dead ends: 17 [2021-11-19 13:26:33,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-19 13:26:33,491 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 7 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:26:33,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 9 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:26:33,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-19 13:26:33,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-11-19 13:26:33,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 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) [2021-11-19 13:26:33,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-19 13:26:33,499 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 8 [2021-11-19 13:26:33,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:26:33,499 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-19 13:26:33,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) 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) [2021-11-19 13:26:33,500 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-19 13:26:33,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-19 13:26:33,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:26:33,501 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1] [2021-11-19 13:26:33,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 13:26:33,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-19 13:26:33,707 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:26:33,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:26:33,708 INFO L85 PathProgramCache]: Analyzing trace with hash -1544534139, now seen corresponding path program 2 times [2021-11-19 13:26:33,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:26:33,709 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116437290] [2021-11-19 13:26:33,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:33,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:26:33,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:33,898 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:33,899 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:26:33,901 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116437290] [2021-11-19 13:26:33,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116437290] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:26:33,902 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [974513783] [2021-11-19 13:26:33,903 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:26:33,903 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:33,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:26:33,904 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:26:33,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 13:26:33,990 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-19 13:26:33,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:26:33,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:26:34,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:26:34,290 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:34,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:26:34,696 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:34,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [974513783] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:26:34,697 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [979836767] [2021-11-19 13:26:34,702 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 13:26:34,703 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:26:34,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:26:34,704 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:26:34,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:26:34,722 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:34,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 84 [2021-11-19 13:26:34,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:34,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:34,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:34,774 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:34,789 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 199 [2021-11-19 13:26:34,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:34,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:34,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:34,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:34,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:34,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:34,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:34,861 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:26:34,865 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:26:34,876 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:26:35,072 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:26:35,073 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:26:35,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-11-19 13:26:35,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768464750] [2021-11-19 13:26:35,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:26:35,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-19 13:26:35,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:26:35,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-19 13:26:35,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2021-11-19 13:26:35,075 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 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) [2021-11-19 13:26:35,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:26:35,501 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2021-11-19 13:26:35,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-19 13:26:35,502 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 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 [2021-11-19 13:26:35,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:26:35,503 INFO L225 Difference]: With dead ends: 39 [2021-11-19 13:26:35,503 INFO L226 Difference]: Without dead ends: 35 [2021-11-19 13:26:35,504 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=177, Invalid=423, Unknown=0, NotChecked=0, Total=600 [2021-11-19 13:26:35,505 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 36 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:26:35,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 15 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:26:35,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-19 13:26:35,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 20. [2021-11-19 13:26:35,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 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) [2021-11-19 13:26:35,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-19 13:26:35,521 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 9 [2021-11-19 13:26:35,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:26:35,521 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-19 13:26:35,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 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) [2021-11-19 13:26:35,523 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-19 13:26:35,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-19 13:26:35,523 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:26:35,524 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1] [2021-11-19 13:26:35,570 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-19 13:26:35,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:35,738 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:26:35,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:26:35,739 INFO L85 PathProgramCache]: Analyzing trace with hash -1895401929, now seen corresponding path program 2 times [2021-11-19 13:26:35,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:26:35,739 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440907686] [2021-11-19 13:26:35,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:35,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:26:35,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:35,929 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:35,929 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:26:35,929 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440907686] [2021-11-19 13:26:35,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440907686] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:26:35,930 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060324292] [2021-11-19 13:26:35,930 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:26:35,931 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:35,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:26:35,932 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:26:35,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 13:26:35,997 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-19 13:26:35,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:26:35,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 13:26:36,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:26:36,193 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:36,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:26:36,815 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:36,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060324292] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:26:36,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1506460181] [2021-11-19 13:26:36,819 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-19 13:26:36,819 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:26:36,819 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:26:36,820 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:26:36,820 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:26:36,828 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:36,833 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 84 [2021-11-19 13:26:36,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:36,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:36,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:36,864 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:36,875 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 199 [2021-11-19 13:26:36,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:36,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:36,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:36,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:36,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:36,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:36,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:36,912 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:26:36,915 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:26:36,923 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:26:37,152 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:26:37,152 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:26:37,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2021-11-19 13:26:37,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205898847] [2021-11-19 13:26:37,153 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:26:37,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-19 13:26:37,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:26:37,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-19 13:26:37,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2021-11-19 13:26:37,155 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 16 states, 16 states have (on average 1.375) 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) [2021-11-19 13:26:37,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:26:37,412 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2021-11-19 13:26:37,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-19 13:26:37,413 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.375) 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 12 [2021-11-19 13:26:37,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:26:37,416 INFO L225 Difference]: With dead ends: 41 [2021-11-19 13:26:37,416 INFO L226 Difference]: Without dead ends: 27 [2021-11-19 13:26:37,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2021-11-19 13:26:37,418 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 38 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:26:37,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 11 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:26:37,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-19 13:26:37,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-11-19 13:26:37,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 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) [2021-11-19 13:26:37,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-19 13:26:37,428 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 12 [2021-11-19 13:26:37,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:26:37,429 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-19 13:26:37,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.375) 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) [2021-11-19 13:26:37,430 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-19 13:26:37,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-19 13:26:37,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:26:37,431 INFO L514 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1] [2021-11-19 13:26:37,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-19 13:26:37,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:37,657 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:26:37,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:26:37,658 INFO L85 PathProgramCache]: Analyzing trace with hash 779749317, now seen corresponding path program 3 times [2021-11-19 13:26:37,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:26:37,658 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707980288] [2021-11-19 13:26:37,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:37,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:26:37,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:37,921 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:37,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:26:37,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707980288] [2021-11-19 13:26:37,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707980288] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:26:37,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590747687] [2021-11-19 13:26:37,921 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:26:37,922 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:37,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:26:37,923 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:26:37,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 13:26:38,023 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:26:38,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:26:38,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-19 13:26:38,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:26:38,435 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:38,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:26:39,639 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:39,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590747687] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:26:39,640 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641869043] [2021-11-19 13:26:39,642 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 13:26:39,642 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:26:39,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:26:39,643 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:26:39,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:26:39,650 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:39,655 INFO L185 QuantifierPusher]: treesize reduction 10, result has 87.8 percent of original size 72 [2021-11-19 13:26:39,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:39,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:39,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:39,689 INFO L180 QuantifierPusher]: treesize reduction 10, result has 95.0 percent of original size [2021-11-19 13:26:39,698 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 189 [2021-11-19 13:26:39,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:39,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:39,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:39,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:39,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:39,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:39,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:39,735 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:26:39,737 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:26:39,743 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:26:39,960 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:26:39,960 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:26:39,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2021-11-19 13:26:39,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491627142] [2021-11-19 13:26:39,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:26:39,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-19 13:26:39,961 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:26:39,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-19 13:26:39,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=541, Unknown=0, NotChecked=0, Total=812 [2021-11-19 13:26:39,963 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 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) [2021-11-19 13:26:41,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:26:41,133 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2021-11-19 13:26:41,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-19 13:26:41,135 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 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 [2021-11-19 13:26:41,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:26:41,139 INFO L225 Difference]: With dead ends: 69 [2021-11-19 13:26:41,139 INFO L226 Difference]: Without dead ends: 63 [2021-11-19 13:26:41,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 20 SyntacticMatches, 9 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=771, Invalid=1581, Unknown=0, NotChecked=0, Total=2352 [2021-11-19 13:26:41,145 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 98 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 13:26:41,146 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 20 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 13:26:41,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-19 13:26:41,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 32. [2021-11-19 13:26:41,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 31 states have internal predecessors, (40), 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) [2021-11-19 13:26:41,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-11-19 13:26:41,157 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 15 [2021-11-19 13:26:41,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:26:41,157 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-11-19 13:26:41,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 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) [2021-11-19 13:26:41,158 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-11-19 13:26:41,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-19 13:26:41,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:26:41,159 INFO L514 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1] [2021-11-19 13:26:41,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 13:26:41,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-19 13:26:41,380 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:26:41,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:26:41,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1916685111, now seen corresponding path program 3 times [2021-11-19 13:26:41,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:26:41,381 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175196175] [2021-11-19 13:26:41,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:41,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:26:41,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:41,781 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:41,782 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:26:41,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175196175] [2021-11-19 13:26:41,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175196175] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:26:41,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773096844] [2021-11-19 13:26:41,782 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:26:41,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:41,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:26:41,786 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:26:41,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 13:26:42,082 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:26:42,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:26:42,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-19 13:26:42,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:26:42,606 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:42,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:26:44,880 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:44,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773096844] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:26:44,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [474886234] [2021-11-19 13:26:44,883 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-19 13:26:44,883 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:26:44,884 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:26:44,884 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:26:44,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:26:44,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:44,895 INFO L185 QuantifierPusher]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-11-19 13:26:44,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:44,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:44,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:44,927 INFO L180 QuantifierPusher]: treesize reduction 6, result has 96.9 percent of original size [2021-11-19 13:26:44,936 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 189 [2021-11-19 13:26:44,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:44,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:44,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:44,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:44,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:44,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:44,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:44,971 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:26:44,974 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:26:44,981 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:26:45,229 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:26:45,230 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:26:45,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2021-11-19 13:26:45,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107336740] [2021-11-19 13:26:45,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:26:45,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-19 13:26:45,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:26:45,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-19 13:26:45,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2021-11-19 13:26:45,233 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 32 states, 32 states have (on average 1.1875) 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) [2021-11-19 13:26:45,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:26:45,771 INFO L93 Difference]: Finished difference Result 73 states and 96 transitions. [2021-11-19 13:26:45,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-19 13:26:45,776 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.1875) 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 20 [2021-11-19 13:26:45,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:26:45,777 INFO L225 Difference]: With dead ends: 73 [2021-11-19 13:26:45,778 INFO L226 Difference]: Without dead ends: 47 [2021-11-19 13:26:45,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 27 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2021-11-19 13:26:45,780 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 67 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 13:26:45,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 11 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 13:26:45,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-19 13:26:45,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2021-11-19 13:26:45,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 38 states have (on average 1.263157894736842) internal successors, (48), 39 states have internal predecessors, (48), 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) [2021-11-19 13:26:45,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-19 13:26:45,795 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 20 [2021-11-19 13:26:45,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:26:45,796 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-19 13:26:45,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.1875) 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) [2021-11-19 13:26:45,797 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-19 13:26:45,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-19 13:26:45,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:26:45,799 INFO L514 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1] [2021-11-19 13:26:45,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-19 13:26:46,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:46,026 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:26:46,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:26:46,027 INFO L85 PathProgramCache]: Analyzing trace with hash -1091700667, now seen corresponding path program 4 times [2021-11-19 13:26:46,027 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:26:46,027 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112784022] [2021-11-19 13:26:46,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:46,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:26:46,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:46,714 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:46,714 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:26:46,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112784022] [2021-11-19 13:26:46,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112784022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:26:46,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186824750] [2021-11-19 13:26:46,714 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 13:26:46,715 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:46,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:26:46,718 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:26:46,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-19 13:26:46,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:46,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-19 13:26:46,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:26:47,882 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:47,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:26:51,646 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:51,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1186824750] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:26:51,646 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1505687279] [2021-11-19 13:26:51,649 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 13:26:51,649 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:26:51,649 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:26:51,649 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:26:51,650 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:26:51,655 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:26:51,661 INFO L185 QuantifierPusher]: treesize reduction 10, result has 87.8 percent of original size 72 [2021-11-19 13:26:51,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:51,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:51,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:51,697 INFO L180 QuantifierPusher]: treesize reduction 10, result has 95.0 percent of original size [2021-11-19 13:26:51,704 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 189 [2021-11-19 13:26:51,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:51,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:51,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:51,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:51,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:51,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:51,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:26:51,740 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:26:51,743 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:26:51,748 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:26:52,044 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:26:52,045 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:26:52,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2021-11-19 13:26:52,045 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789558584] [2021-11-19 13:26:52,045 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:26:52,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-19 13:26:52,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:26:52,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-19 13:26:52,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1099, Invalid=1657, Unknown=0, NotChecked=0, Total=2756 [2021-11-19 13:26:52,049 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 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) [2021-11-19 13:26:55,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:26:55,558 INFO L93 Difference]: Finished difference Result 129 states and 152 transitions. [2021-11-19 13:26:55,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-19 13:26:55,558 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 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 27 [2021-11-19 13:26:55,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:26:55,560 INFO L225 Difference]: With dead ends: 129 [2021-11-19 13:26:55,560 INFO L226 Difference]: Without dead ends: 119 [2021-11-19 13:26:55,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 32 SyntacticMatches, 21 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2270 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=3255, Invalid=6057, Unknown=0, NotChecked=0, Total=9312 [2021-11-19 13:26:55,566 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 258 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:26:55,566 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [258 Valid, 30 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 13:26:55,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-19 13:26:55,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 56. [2021-11-19 13:26:55,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 54 states have (on average 1.3333333333333333) internal successors, (72), 55 states have internal predecessors, (72), 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) [2021-11-19 13:26:55,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 72 transitions. [2021-11-19 13:26:55,581 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 72 transitions. Word has length 27 [2021-11-19 13:26:55,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:26:55,582 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 72 transitions. [2021-11-19 13:26:55,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 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) [2021-11-19 13:26:55,583 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 72 transitions. [2021-11-19 13:26:55,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-19 13:26:55,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:26:55,584 INFO L514 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1] [2021-11-19 13:26:55,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-19 13:26:55,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-19 13:26:55,800 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:26:55,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:26:55,801 INFO L85 PathProgramCache]: Analyzing trace with hash 163509559, now seen corresponding path program 4 times [2021-11-19 13:26:55,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:26:55,801 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470112543] [2021-11-19 13:26:55,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:26:55,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:26:55,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:56,744 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:56,745 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:26:56,745 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470112543] [2021-11-19 13:26:56,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470112543] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:26:56,745 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143891572] [2021-11-19 13:26:56,745 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 13:26:56,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:26:56,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:26:56,750 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:26:56,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-19 13:26:56,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:26:56,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-19 13:26:56,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:26:58,056 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:26:58,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:27:05,523 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:27:05,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143891572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:27:05,524 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [114252917] [2021-11-19 13:27:05,526 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-19 13:27:05,526 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:27:05,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:27:05,527 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:27:05,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:27:05,534 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:27:05,539 INFO L185 QuantifierPusher]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-11-19 13:27:05,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:05,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:05,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:05,570 INFO L180 QuantifierPusher]: treesize reduction 6, result has 96.9 percent of original size [2021-11-19 13:27:05,577 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 189 [2021-11-19 13:27:05,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:05,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:05,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:05,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:05,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:05,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:05,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:05,608 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:27:05,611 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:27:05,618 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:27:06,003 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:27:06,003 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:27:06,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2021-11-19 13:27:06,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322203181] [2021-11-19 13:27:06,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:27:06,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-19 13:27:06,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:27:06,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-19 13:27:06,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2021-11-19 13:27:06,009 INFO L87 Difference]: Start difference. First operand 56 states and 72 transitions. Second operand has 64 states, 64 states have (on average 1.09375) 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) [2021-11-19 13:27:06,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:27:06,991 INFO L93 Difference]: Finished difference Result 137 states and 184 transitions. [2021-11-19 13:27:06,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-19 13:27:06,992 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.09375) 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 36 [2021-11-19 13:27:06,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:27:06,993 INFO L225 Difference]: With dead ends: 137 [2021-11-19 13:27:06,994 INFO L226 Difference]: Without dead ends: 87 [2021-11-19 13:27:06,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 43 SyntacticMatches, 30 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 891 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2021-11-19 13:27:06,998 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 156 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 13:27:06,998 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 14 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 13:27:06,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-19 13:27:07,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 72. [2021-11-19 13:27:07,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 70 states have (on average 1.2571428571428571) internal successors, (88), 71 states have internal predecessors, (88), 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) [2021-11-19 13:27:07,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 88 transitions. [2021-11-19 13:27:07,015 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 88 transitions. Word has length 36 [2021-11-19 13:27:07,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:27:07,015 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 88 transitions. [2021-11-19 13:27:07,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.09375) 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) [2021-11-19 13:27:07,016 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 88 transitions. [2021-11-19 13:27:07,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-19 13:27:07,018 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:27:07,018 INFO L514 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1] [2021-11-19 13:27:07,049 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-19 13:27:07,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-11-19 13:27:07,219 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:27:07,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:27:07,219 INFO L85 PathProgramCache]: Analyzing trace with hash -632841915, now seen corresponding path program 5 times [2021-11-19 13:27:07,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:27:07,220 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327947146] [2021-11-19 13:27:07,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:27:07,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:27:07,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:27:09,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:27:09,315 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:27:09,315 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327947146] [2021-11-19 13:27:09,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1327947146] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:27:09,316 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15632280] [2021-11-19 13:27:09,316 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:27:09,316 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:27:09,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:27:09,318 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:27:09,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-19 13:27:29,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-19 13:27:29,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:27:29,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-19 13:27:29,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:27:31,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:27:31,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:27:43,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:27:43,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15632280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:27:43,198 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1320925876] [2021-11-19 13:27:43,201 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 13:27:43,201 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:27:43,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:27:43,201 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:27:43,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:27:43,207 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:27:43,211 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 88 [2021-11-19 13:27:43,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:43,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:43,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:43,237 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:27:43,245 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 199 [2021-11-19 13:27:43,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:43,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:43,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:43,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:43,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:43,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:43,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:27:43,276 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:27:43,279 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:27:43,283 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:27:43,723 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:27:43,723 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:27:43,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2021-11-19 13:27:43,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520187223] [2021-11-19 13:27:43,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:27:43,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-19 13:27:43,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:27:43,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-19 13:27:43,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4483, Invalid=5617, Unknown=0, NotChecked=0, Total=10100 [2021-11-19 13:27:43,732 INFO L87 Difference]: Start difference. First operand 72 states and 88 transitions. Second operand has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 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) [2021-11-19 13:27:54,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:27:54,992 INFO L93 Difference]: Finished difference Result 249 states and 296 transitions. [2021-11-19 13:27:54,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-19 13:27:54,992 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 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 51 [2021-11-19 13:27:54,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:27:54,995 INFO L225 Difference]: With dead ends: 249 [2021-11-19 13:27:54,995 INFO L226 Difference]: Without dead ends: 231 [2021-11-19 13:27:55,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 56 SyntacticMatches, 45 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9158 ImplicationChecksByTransitivity, 23.5s TimeCoverageRelationStatistics Valid=13407, Invalid=23649, Unknown=0, NotChecked=0, Total=37056 [2021-11-19 13:27:55,005 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 581 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 581 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 13:27:55,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [581 Valid, 44 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 13:27:55,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-19 13:27:55,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 104. [2021-11-19 13:27:55,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 102 states have (on average 1.3333333333333333) internal successors, (136), 103 states have internal predecessors, (136), 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) [2021-11-19 13:27:55,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 136 transitions. [2021-11-19 13:27:55,032 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 136 transitions. Word has length 51 [2021-11-19 13:27:55,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:27:55,033 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 136 transitions. [2021-11-19 13:27:55,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 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) [2021-11-19 13:27:55,033 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 136 transitions. [2021-11-19 13:27:55,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-19 13:27:55,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:27:55,037 INFO L514 BasicCegarLoop]: trace histogram [62, 1, 1, 1, 1, 1, 1] [2021-11-19 13:27:55,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-19 13:27:55,254 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2021-11-19 13:27:55,255 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:27:55,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:27:55,255 INFO L85 PathProgramCache]: Analyzing trace with hash 1225017655, now seen corresponding path program 5 times [2021-11-19 13:27:55,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:27:55,255 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744607781] [2021-11-19 13:27:55,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:27:55,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:27:55,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:27:58,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:27:58,278 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:27:58,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744607781] [2021-11-19 13:27:58,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744607781] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:27:58,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731856455] [2021-11-19 13:27:58,278 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:27:58,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:27:58,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:27:58,280 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:27:58,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-19 13:30:58,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-11-19 13:30:58,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:30:58,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 470 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-19 13:30:58,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:31:01,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:31:01,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:31:19,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:31:19,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731856455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:31:19,366 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1540421847] [2021-11-19 13:31:19,368 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-19 13:31:19,368 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:31:19,368 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:31:19,368 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:31:19,368 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:31:19,392 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:31:19,395 INFO L185 QuantifierPusher]: treesize reduction 6, result has 92.3 percent of original size 72 [2021-11-19 13:31:19,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:31:19,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:31:19,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:31:19,425 INFO L180 QuantifierPusher]: treesize reduction 6, result has 96.9 percent of original size [2021-11-19 13:31:19,431 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 189 [2021-11-19 13:31:19,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:31:19,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:31:19,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:31:19,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:31:19,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:31:19,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:31:19,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:31:19,457 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:31:19,459 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:31:19,465 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:31:19,841 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:31:19,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:31:19,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2021-11-19 13:31:19,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668666847] [2021-11-19 13:31:19,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:31:19,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2021-11-19 13:31:19,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:31:19,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2021-11-19 13:31:19,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2021-11-19 13:31:19,846 INFO L87 Difference]: Start difference. First operand 104 states and 136 transitions. Second operand has 128 states, 128 states have (on average 1.046875) 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) [2021-11-19 13:31:21,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:31:21,554 INFO L93 Difference]: Finished difference Result 265 states and 360 transitions. [2021-11-19 13:31:21,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-19 13:31:21,555 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 1.046875) 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 68 [2021-11-19 13:31:21,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:31:21,556 INFO L225 Difference]: With dead ends: 265 [2021-11-19 13:31:21,556 INFO L226 Difference]: Without dead ends: 167 [2021-11-19 13:31:21,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 75 SyntacticMatches, 62 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2826 ImplicationChecksByTransitivity, 21.1s TimeCoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2021-11-19 13:31:21,560 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 402 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 402 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-19 13:31:21,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [402 Valid, 15 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-19 13:31:21,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-19 13:31:21,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 136. [2021-11-19 13:31:21,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 134 states have (on average 1.2537313432835822) internal successors, (168), 135 states have internal predecessors, (168), 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) [2021-11-19 13:31:21,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 168 transitions. [2021-11-19 13:31:21,581 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 168 transitions. Word has length 68 [2021-11-19 13:31:21,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:31:21,581 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 168 transitions. [2021-11-19 13:31:21,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 1.046875) 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) [2021-11-19 13:31:21,582 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 168 transitions. [2021-11-19 13:31:21,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-19 13:31:21,587 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:31:21,587 INFO L514 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1] [2021-11-19 13:31:21,597 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-19 13:31:21,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:31:21,790 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:31:21,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:31:21,790 INFO L85 PathProgramCache]: Analyzing trace with hash 1245829957, now seen corresponding path program 6 times [2021-11-19 13:31:21,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:31:21,791 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140059868] [2021-11-19 13:31:21,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:31:21,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:31:22,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:31:26,825 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:31:26,825 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:31:26,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140059868] [2021-11-19 13:31:26,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1140059868] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:31:26,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621558775] [2021-11-19 13:31:26,825 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:31:26,825 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:31:26,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:31:26,826 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:31:26,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-19 13:31:28,443 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:31:28,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:31:28,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 693 conjuncts, 191 conjunts are in the unsatisfiable core [2021-11-19 13:31:28,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:31:33,829 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:31:33,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:32:09,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:32:09,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621558775] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:32:09,054 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1457192653] [2021-11-19 13:32:09,055 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 13:32:09,055 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:32:09,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:32:09,056 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:32:09,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:32:09,060 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:32:09,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 84 [2021-11-19 13:32:09,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:32:09,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:32:09,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:32:09,085 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:32:09,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 199 [2021-11-19 13:32:09,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:32:09,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:32:09,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:32:09,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:32:09,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:32:09,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:32:09,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:32:09,112 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:32:09,115 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:32:09,119 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:32:09,604 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:32:09,605 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:32:09,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2021-11-19 13:32:09,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651516207] [2021-11-19 13:32:09,605 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:32:09,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2021-11-19 13:32:09,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:32:09,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2021-11-19 13:32:09,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18163, Invalid=20449, Unknown=0, NotChecked=0, Total=38612 [2021-11-19 13:32:09,613 INFO L87 Difference]: Start difference. First operand 136 states and 168 transitions. Second operand has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 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) [2021-11-19 13:32:45,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:32:45,118 INFO L93 Difference]: Finished difference Result 489 states and 584 transitions. [2021-11-19 13:32:45,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2021-11-19 13:32:45,119 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 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 99 [2021-11-19 13:32:45,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:32:45,122 INFO L225 Difference]: With dead ends: 489 [2021-11-19 13:32:45,123 INFO L226 Difference]: Without dead ends: 455 [2021-11-19 13:32:45,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 104 SyntacticMatches, 93 SemanticMatches, 383 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36758 ImplicationChecksByTransitivity, 74.2s TimeCoverageRelationStatistics Valid=54447, Invalid=93393, Unknown=0, NotChecked=0, Total=147840 [2021-11-19 13:32:45,134 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 1260 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1260 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-19 13:32:45,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1260 Valid, 84 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-19 13:32:45,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-19 13:32:45,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 200. [2021-11-19 13:32:45,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 198 states have (on average 1.3333333333333333) internal successors, (264), 199 states have internal predecessors, (264), 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) [2021-11-19 13:32:45,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 264 transitions. [2021-11-19 13:32:45,164 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 264 transitions. Word has length 99 [2021-11-19 13:32:45,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:32:45,165 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 264 transitions. [2021-11-19 13:32:45,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 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) [2021-11-19 13:32:45,166 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 264 transitions. [2021-11-19 13:32:45,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-19 13:32:45,169 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:32:45,170 INFO L514 BasicCegarLoop]: trace histogram [126, 1, 1, 1, 1, 1, 1] [2021-11-19 13:32:45,200 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-19 13:32:45,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2021-11-19 13:32:45,378 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:32:45,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:32:45,378 INFO L85 PathProgramCache]: Analyzing trace with hash 1755246903, now seen corresponding path program 6 times [2021-11-19 13:32:45,379 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:32:45,379 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233228712] [2021-11-19 13:32:45,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:32:45,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:32:46,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:32:54,209 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:32:54,210 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:32:54,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233228712] [2021-11-19 13:32:54,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233228712] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:32:54,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15850483] [2021-11-19 13:32:54,210 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:32:54,210 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:32:54,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:32:54,211 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:32:54,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-19 13:32:57,051 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:32:57,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:32:57,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 918 conjuncts, 255 conjunts are in the unsatisfiable core [2021-11-19 13:32:57,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:33:07,308 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:33:07,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:34:34,126 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:34:34,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15850483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:34:34,127 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1008567211] [2021-11-19 13:34:34,129 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-19 13:34:34,129 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:34:34,130 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:34:34,130 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:34:34,130 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:34:34,141 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:34:34,143 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 84 [2021-11-19 13:34:34,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:34:34,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:34:34,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:34:34,161 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:34:34,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 199 [2021-11-19 13:34:34,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:34:34,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:34:34,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:34:34,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:34:34,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:34:34,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:34:34,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:34:34,188 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:34:34,191 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:34:34,197 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:34:34,851 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:34:34,851 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:34:34,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 256 [2021-11-19 13:34:34,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613234421] [2021-11-19 13:34:34,852 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:34:34,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 256 states [2021-11-19 13:34:34,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:34:34,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 256 interpolants. [2021-11-19 13:34:34,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32656, Invalid=35204, Unknown=0, NotChecked=0, Total=67860 [2021-11-19 13:34:34,867 INFO L87 Difference]: Start difference. First operand 200 states and 264 transitions. Second operand has 256 states, 256 states have (on average 1.0234375) 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) [2021-11-19 13:34:45,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:34:45,752 INFO L93 Difference]: Finished difference Result 521 states and 712 transitions. [2021-11-19 13:34:45,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 256 states. [2021-11-19 13:34:45,753 INFO L78 Accepts]: Start accepts. Automaton has has 256 states, 256 states have (on average 1.0234375) 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 132 [2021-11-19 13:34:45,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:34:45,756 INFO L225 Difference]: With dead ends: 521 [2021-11-19 13:34:45,756 INFO L226 Difference]: Without dead ends: 327 [2021-11-19 13:34:45,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 139 SyntacticMatches, 126 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9770 ImplicationChecksByTransitivity, 99.7s TimeCoverageRelationStatistics Valid=32656, Invalid=35204, Unknown=0, NotChecked=0, Total=67860 [2021-11-19 13:34:45,764 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 1180 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 544 mSolverCounterSat, 523 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1180 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 1067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 523 IncrementalHoareTripleChecker+Valid, 544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:34:45,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1180 Valid, 16 Invalid, 1067 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [523 Valid, 544 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2021-11-19 13:34:45,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-11-19 13:34:45,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 264. [2021-11-19 13:34:45,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 262 states have (on average 1.251908396946565) internal successors, (328), 263 states have internal predecessors, (328), 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) [2021-11-19 13:34:45,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 328 transitions. [2021-11-19 13:34:45,803 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 328 transitions. Word has length 132 [2021-11-19 13:34:45,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:34:45,804 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 328 transitions. [2021-11-19 13:34:45,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 256 states, 256 states have (on average 1.0234375) 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) [2021-11-19 13:34:45,805 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 328 transitions. [2021-11-19 13:34:45,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-19 13:34:45,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:34:45,810 INFO L514 BasicCegarLoop]: trace histogram [190, 1, 1, 1, 1, 1] [2021-11-19 13:34:45,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-19 13:34:46,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable122 [2021-11-19 13:34:46,019 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:34:46,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:34:46,020 INFO L85 PathProgramCache]: Analyzing trace with hash 189947717, now seen corresponding path program 7 times [2021-11-19 13:34:46,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:34:46,020 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868953012] [2021-11-19 13:34:46,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:34:46,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:34:49,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:35:07,206 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:35:07,207 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:35:07,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868953012] [2021-11-19 13:35:07,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1868953012] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:35:07,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913102270] [2021-11-19 13:35:07,208 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 13:35:07,208 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:35:07,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:35:07,209 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:35:07,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e52acadd-ff7e-4a8b-b2dd-85bcac920fee/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-19 13:35:22,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:35:22,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 1365 conjuncts, 383 conjunts are in the unsatisfiable core [2021-11-19 13:35:22,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:35:44,460 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:35:44,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:38:29,457 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:38:29,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913102270] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:38:29,458 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [291732504] [2021-11-19 13:38:29,459 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 13:38:29,460 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 13:38:29,460 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 13:38:29,460 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 13:38:29,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 13:38:29,467 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:38:29,469 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 84 [2021-11-19 13:38:29,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:38:29,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:38:29,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:38:29,488 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 13:38:29,494 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 199 [2021-11-19 13:38:29,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:38:29,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:38:29,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:38:29,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:38:29,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:38:29,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:38:29,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 13:38:29,516 INFO L180 QuantifierPusher]: treesize reduction 12, result has 75.0 percent of original size [2021-11-19 13:38:29,518 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 13:38:29,522 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 13:38:30,402 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 13:38:30,402 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 13:38:30,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 385 [2021-11-19 13:38:30,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333232180] [2021-11-19 13:38:30,403 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 13:38:30,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2021-11-19 13:38:30,404 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:38:30,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2021-11-19 13:38:30,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73171, Invalid=77761, Unknown=0, NotChecked=0, Total=150932 [2021-11-19 13:38:30,426 INFO L87 Difference]: Start difference. First operand 264 states and 328 transitions. Second operand has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 385 states have internal predecessors, (391), 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)