./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl --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 c056d4e57d61d37550728f0e28e1a5e47ebeedfd3e4791c23bdeb0bab1210358 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:03:59,942 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:03:59,945 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:03:59,976 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:03:59,977 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:03:59,978 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:03:59,980 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:03:59,983 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:03:59,986 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:03:59,987 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:03:59,989 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:03:59,991 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:03:59,991 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:03:59,993 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:03:59,995 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:03:59,997 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:03:59,999 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:04:00,001 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:04:00,003 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:04:00,007 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:04:00,010 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:04:00,011 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:04:00,013 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:04:00,015 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:04:00,019 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:04:00,020 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:04:00,021 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:04:00,022 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:04:00,023 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:04:00,025 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:04:00,025 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:04:00,027 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:04:00,028 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:04:00,030 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:04:00,032 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:04:00,036 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:04:00,038 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:04:00,040 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:04:00,040 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:04:00,041 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:04:00,042 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:04:00,048 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:04:00,098 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:04:00,099 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:04:00,099 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:04:00,099 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:04:00,100 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:04:00,100 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:04:00,100 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:04:00,100 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:04:00,100 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:04:00,100 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:04:00,101 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:04:00,101 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:04:00,101 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:04:00,101 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:04:00,101 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:04:00,101 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:04:00,101 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:04:00,102 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:04:00,102 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:04:00,102 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:04:00,102 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:04:00,102 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:04:00,103 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:04:00,103 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:04:00,103 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:04:00,103 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:04:00,104 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:04:00,104 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:04:00,104 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:04:00,105 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:04:00,105 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:04:00,105 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:04:00,105 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:04:00,106 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:04:00,106 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:04:00,106 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:04:00,106 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:04:00,107 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:04:00,107 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:04:00,107 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:04:00,107 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:04:00,108 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_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c056d4e57d61d37550728f0e28e1a5e47ebeedfd3e4791c23bdeb0bab1210358 [2021-11-23 17:04:00,441 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:04:00,473 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:04:00,478 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:04:00,479 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:04:00,480 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:04:00,481 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c [2021-11-23 17:04:00,577 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/data/f1ab87b50/8e8ce000248d4b29a5789bb9c884bafa/FLAG2211eadd2 [2021-11-23 17:04:01,138 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:04:01,139 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c [2021-11-23 17:04:01,160 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/data/f1ab87b50/8e8ce000248d4b29a5789bb9c884bafa/FLAG2211eadd2 [2021-11-23 17:04:01,481 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/data/f1ab87b50/8e8ce000248d4b29a5789bb9c884bafa [2021-11-23 17:04:01,484 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:04:01,486 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:04:01,488 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:04:01,498 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:04:01,501 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:04:01,502 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:04:01" (1/1) ... [2021-11-23 17:04:01,503 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33696f88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:01, skipping insertion in model container [2021-11-23 17:04:01,503 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:04:01" (1/1) ... [2021-11-23 17:04:01,511 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:04:01,570 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:04:01,836 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_d2c23260-c82c-4687-b5be-9dc33bc94e9d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c[5769,5782] [2021-11-23 17:04:01,901 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:04:01,933 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:04:02,016 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_d2c23260-c82c-4687-b5be-9dc33bc94e9d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c[5769,5782] [2021-11-23 17:04:02,035 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:04:02,056 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:04:02,057 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02 WrapperNode [2021-11-23 17:04:02,057 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:04:02,058 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:04:02,059 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:04:02,059 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:04:02,068 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02" (1/1) ... [2021-11-23 17:04:02,080 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02" (1/1) ... [2021-11-23 17:04:02,130 INFO L137 Inliner]: procedures = 24, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 417 [2021-11-23 17:04:02,130 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:04:02,131 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:04:02,131 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:04:02,132 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:04:02,154 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02" (1/1) ... [2021-11-23 17:04:02,154 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02" (1/1) ... [2021-11-23 17:04:02,175 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02" (1/1) ... [2021-11-23 17:04:02,175 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02" (1/1) ... [2021-11-23 17:04:02,184 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02" (1/1) ... [2021-11-23 17:04:02,200 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02" (1/1) ... [2021-11-23 17:04:02,203 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02" (1/1) ... [2021-11-23 17:04:02,220 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:04:02,221 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:04:02,221 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:04:02,222 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:04:02,223 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:02" (1/1) ... [2021-11-23 17:04:02,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:04:02,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:02,267 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:04:02,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:04:02,319 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:04:02,320 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:04:02,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:04:02,321 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:04:02,450 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:04:02,452 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:04:03,069 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:04:03,125 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:04:03,130 INFO L158 Benchmark]: Toolchain (without parser) took 1643.45ms. Allocated memory is still 92.3MB. Free memory was 54.1MB in the beginning and 67.9MB in the end (delta: -13.7MB). Peak memory consumption was 26.0MB. Max. memory is 16.1GB. [2021-11-23 17:04:03,131 INFO L158 Benchmark]: CDTParser took 0.34ms. Allocated memory is still 92.3MB. Free memory is still 70.9MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:04:03,132 INFO L158 Benchmark]: CACSL2BoogieTranslator took 569.71ms. Allocated memory is still 92.3MB. Free memory was 54.0MB in the beginning and 63.1MB in the end (delta: -9.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 17:04:03,132 INFO L158 Benchmark]: Boogie Procedure Inliner took 72.15ms. Allocated memory is still 92.3MB. Free memory was 63.1MB in the beginning and 60.5MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:04:03,133 INFO L158 Benchmark]: Boogie Preprocessor took 89.06ms. Allocated memory is still 92.3MB. Free memory was 60.5MB in the beginning and 58.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:04:03,134 INFO L158 Benchmark]: RCFGBuilder took 907.07ms. Allocated memory is still 92.3MB. Free memory was 58.9MB in the beginning and 67.9MB in the end (delta: -9.0MB). Peak memory consumption was 32.6MB. Max. memory is 16.1GB. [2021-11-23 17:04:03,137 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34ms. Allocated memory is still 92.3MB. Free memory is still 70.9MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 569.71ms. Allocated memory is still 92.3MB. Free memory was 54.0MB in the beginning and 63.1MB in the end (delta: -9.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 72.15ms. Allocated memory is still 92.3MB. Free memory was 63.1MB in the beginning and 60.5MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 89.06ms. Allocated memory is still 92.3MB. Free memory was 60.5MB in the beginning and 58.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 907.07ms. Allocated memory is still 92.3MB. Free memory was 58.9MB in the beginning and 67.9MB in the end (delta: -9.0MB). Peak memory consumption was 32.6MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:04:03,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl --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 c056d4e57d61d37550728f0e28e1a5e47ebeedfd3e4791c23bdeb0bab1210358 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:04:05,885 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:04:05,888 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:04:05,930 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:04:05,931 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:04:05,933 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:04:05,935 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:04:05,938 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:04:05,940 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:04:05,942 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:04:05,943 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:04:05,945 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:04:05,946 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:04:05,947 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:04:05,949 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:04:05,951 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:04:05,953 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:04:05,954 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:04:05,957 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:04:05,960 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:04:05,962 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:04:05,964 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:04:05,966 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:04:05,967 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:04:05,971 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:04:05,972 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:04:05,973 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:04:05,974 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:04:05,975 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:04:05,976 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:04:05,977 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:04:05,978 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:04:05,979 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:04:05,980 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:04:05,998 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:04:05,999 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:04:06,003 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:04:06,003 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:04:06,004 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:04:06,006 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:04:06,007 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:04:06,013 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:04:06,067 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:04:06,067 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:04:06,068 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:04:06,068 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:04:06,070 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:04:06,070 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:04:06,070 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:04:06,070 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:04:06,071 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:04:06,071 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:04:06,072 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:04:06,072 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:04:06,074 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:04:06,075 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:04:06,075 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:04:06,075 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:04:06,075 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:04:06,076 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:04:06,076 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:04:06,076 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:04:06,076 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:04:06,077 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:04:06,077 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:04:06,077 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:04:06,077 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:04:06,078 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:04:06,078 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:04:06,078 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:04:06,078 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:04:06,079 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:04:06,079 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:04:06,079 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:04:06,080 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:04:06,080 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:04:06,080 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:06,080 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:04:06,081 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:04:06,081 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:04:06,081 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c056d4e57d61d37550728f0e28e1a5e47ebeedfd3e4791c23bdeb0bab1210358 [2021-11-23 17:04:06,527 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:04:06,551 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:04:06,555 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:04:06,556 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:04:06,557 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:04:06,559 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c [2021-11-23 17:04:06,649 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/data/f8cce5791/39e2e246a66a471f9131e3dbcc688992/FLAGa85f3e476 [2021-11-23 17:04:07,329 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:04:07,332 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c [2021-11-23 17:04:07,353 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/data/f8cce5791/39e2e246a66a471f9131e3dbcc688992/FLAGa85f3e476 [2021-11-23 17:04:07,616 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/data/f8cce5791/39e2e246a66a471f9131e3dbcc688992 [2021-11-23 17:04:07,619 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:04:07,621 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:04:07,624 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:04:07,624 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:04:07,628 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:04:07,630 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:04:07" (1/1) ... [2021-11-23 17:04:07,632 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5cd43fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:07, skipping insertion in model container [2021-11-23 17:04:07,632 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:04:07" (1/1) ... [2021-11-23 17:04:07,640 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:04:07,700 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:04:08,054 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_d2c23260-c82c-4687-b5be-9dc33bc94e9d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c[5769,5782] [2021-11-23 17:04:08,085 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:04:08,102 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:04:08,179 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_d2c23260-c82c-4687-b5be-9dc33bc94e9d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c[5769,5782] [2021-11-23 17:04:08,206 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:04:08,228 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:04:08,228 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08 WrapperNode [2021-11-23 17:04:08,228 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:04:08,230 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:04:08,230 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:04:08,230 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:04:08,239 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (1/1) ... [2021-11-23 17:04:08,255 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (1/1) ... [2021-11-23 17:04:08,304 INFO L137 Inliner]: procedures = 24, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 401 [2021-11-23 17:04:08,304 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:04:08,306 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:04:08,306 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:04:08,306 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:04:08,316 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (1/1) ... [2021-11-23 17:04:08,317 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (1/1) ... [2021-11-23 17:04:08,324 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (1/1) ... [2021-11-23 17:04:08,324 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (1/1) ... [2021-11-23 17:04:08,349 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (1/1) ... [2021-11-23 17:04:08,355 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (1/1) ... [2021-11-23 17:04:08,358 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (1/1) ... [2021-11-23 17:04:08,378 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:04:08,379 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:04:08,380 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:04:08,380 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:04:08,381 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (1/1) ... [2021-11-23 17:04:08,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:04:08,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:08,417 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:04:08,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:04:08,478 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:04:08,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:04:08,479 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:04:08,479 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:04:08,693 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:04:08,695 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:04:09,296 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:04:09,313 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:04:09,314 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 17:04:09,319 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:04:09 BoogieIcfgContainer [2021-11-23 17:04:09,319 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:04:09,339 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:04:09,339 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:04:09,343 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:04:09,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:04:07" (1/3) ... [2021-11-23 17:04:09,344 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f0c613f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:04:09, skipping insertion in model container [2021-11-23 17:04:09,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:04:08" (2/3) ... [2021-11-23 17:04:09,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f0c613f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:04:09, skipping insertion in model container [2021-11-23 17:04:09,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:04:09" (3/3) ... [2021-11-23 17:04:09,346 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c [2021-11-23 17:04:09,353 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:04:09,367 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:04:09,462 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:04:09,491 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 [2021-11-23 17:04:09,491 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:04:09,511 INFO L276 IsEmpty]: Start isEmpty. Operand has 97 states, 95 states have (on average 1.736842105263158) internal successors, (165), 96 states have internal predecessors, (165), 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) [2021-11-23 17:04:09,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 17:04:09,522 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:09,523 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:09,523 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:09,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:09,530 INFO L85 PathProgramCache]: Analyzing trace with hash -857023919, now seen corresponding path program 1 times [2021-11-23 17:04:09,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:09,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1173122413] [2021-11-23 17:04:09,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:09,549 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:09,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:09,552 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:09,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:04:09,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:09,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:09,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:10,059 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:10,059 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:10,060 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:10,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1173122413] [2021-11-23 17:04:10,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1173122413] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:10,062 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:10,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:10,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994032831] [2021-11-23 17:04:10,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:10,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:10,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:10,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:10,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:10,112 INFO L87 Difference]: Start difference. First operand has 97 states, 95 states have (on average 1.736842105263158) internal successors, (165), 96 states have internal predecessors, (165), 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 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 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) [2021-11-23 17:04:10,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:10,190 INFO L93 Difference]: Finished difference Result 215 states and 350 transitions. [2021-11-23 17:04:10,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:10,193 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 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 59 [2021-11-23 17:04:10,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:10,207 INFO L225 Difference]: With dead ends: 215 [2021-11-23 17:04:10,207 INFO L226 Difference]: Without dead ends: 146 [2021-11-23 17:04:10,211 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:10,216 INFO L933 BasicCegarLoop]: 244 mSDtfsCounter, 115 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:10,218 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 341 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:04:10,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-23 17:04:10,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 144. [2021-11-23 17:04:10,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.4615384615384615) internal successors, (209), 143 states have internal predecessors, (209), 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) [2021-11-23 17:04:10,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 209 transitions. [2021-11-23 17:04:10,286 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 209 transitions. Word has length 59 [2021-11-23 17:04:10,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:10,287 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 209 transitions. [2021-11-23 17:04:10,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 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) [2021-11-23 17:04:10,288 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 209 transitions. [2021-11-23 17:04:10,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 17:04:10,291 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:10,291 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:10,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:10,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:10,506 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:10,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:10,507 INFO L85 PathProgramCache]: Analyzing trace with hash 1265777508, now seen corresponding path program 1 times [2021-11-23 17:04:10,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:10,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1042436138] [2021-11-23 17:04:10,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:10,509 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:10,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:10,515 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:10,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:04:10,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:10,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:04:10,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:11,595 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:11,595 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:11,596 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:11,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1042436138] [2021-11-23 17:04:11,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1042436138] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:11,597 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:11,597 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:04:11,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104143685] [2021-11-23 17:04:11,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:11,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:04:11,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:11,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:04:11,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:04:11,608 INFO L87 Difference]: Start difference. First operand 144 states and 209 transitions. Second operand has 5 states, 5 states have (on average 12.0) internal successors, (60), 4 states have internal predecessors, (60), 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) [2021-11-23 17:04:11,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:11,810 INFO L93 Difference]: Finished difference Result 257 states and 388 transitions. [2021-11-23 17:04:11,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:04:11,812 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 4 states have internal predecessors, (60), 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 60 [2021-11-23 17:04:11,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:11,822 INFO L225 Difference]: With dead ends: 257 [2021-11-23 17:04:11,822 INFO L226 Difference]: Without dead ends: 147 [2021-11-23 17:04:11,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:04:11,827 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 27 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:11,828 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 291 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 84 Invalid, 0 Unknown, 49 Unchecked, 0.1s Time] [2021-11-23 17:04:11,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-23 17:04:11,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2021-11-23 17:04:11,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.452054794520548) internal successors, (212), 146 states have internal predecessors, (212), 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) [2021-11-23 17:04:11,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 212 transitions. [2021-11-23 17:04:11,876 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 212 transitions. Word has length 60 [2021-11-23 17:04:11,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:11,878 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 212 transitions. [2021-11-23 17:04:11,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 4 states have internal predecessors, (60), 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) [2021-11-23 17:04:11,879 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 212 transitions. [2021-11-23 17:04:11,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 17:04:11,883 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:11,883 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:11,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:12,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:12,099 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:12,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:12,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1170767799, now seen corresponding path program 1 times [2021-11-23 17:04:12,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:12,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [650333301] [2021-11-23 17:04:12,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:12,102 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:12,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:12,103 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:12,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:04:12,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:12,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:12,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:12,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:12,404 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:12,404 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:12,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [650333301] [2021-11-23 17:04:12,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [650333301] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:12,408 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:12,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:12,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339474065] [2021-11-23 17:04:12,409 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:12,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:12,412 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:12,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:12,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:12,415 INFO L87 Difference]: Start difference. First operand 147 states and 212 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 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) [2021-11-23 17:04:12,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:12,451 INFO L93 Difference]: Finished difference Result 351 states and 536 transitions. [2021-11-23 17:04:12,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:12,452 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 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 60 [2021-11-23 17:04:12,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:12,456 INFO L225 Difference]: With dead ends: 351 [2021-11-23 17:04:12,456 INFO L226 Difference]: Without dead ends: 241 [2021-11-23 17:04:12,461 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:12,465 INFO L933 BasicCegarLoop]: 200 mSDtfsCounter, 80 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:12,467 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 294 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:04:12,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-11-23 17:04:12,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 239. [2021-11-23 17:04:12,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.504201680672269) internal successors, (358), 238 states have internal predecessors, (358), 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) [2021-11-23 17:04:12,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 358 transitions. [2021-11-23 17:04:12,514 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 358 transitions. Word has length 60 [2021-11-23 17:04:12,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:12,517 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 358 transitions. [2021-11-23 17:04:12,517 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 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) [2021-11-23 17:04:12,517 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 358 transitions. [2021-11-23 17:04:12,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 17:04:12,522 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:12,522 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:12,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:12,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:12,745 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:12,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:12,748 INFO L85 PathProgramCache]: Analyzing trace with hash 832748772, now seen corresponding path program 1 times [2021-11-23 17:04:12,748 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:12,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [451918002] [2021-11-23 17:04:12,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:12,749 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:12,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:12,751 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:12,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:04:12,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:12,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:12,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:13,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:13,066 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:13,067 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:13,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [451918002] [2021-11-23 17:04:13,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [451918002] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:13,067 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:13,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:13,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645167543] [2021-11-23 17:04:13,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:13,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:13,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:13,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:13,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:13,070 INFO L87 Difference]: Start difference. First operand 239 states and 358 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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) [2021-11-23 17:04:13,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:13,114 INFO L93 Difference]: Finished difference Result 611 states and 948 transitions. [2021-11-23 17:04:13,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:13,115 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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 61 [2021-11-23 17:04:13,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:13,119 INFO L225 Difference]: With dead ends: 611 [2021-11-23 17:04:13,120 INFO L226 Difference]: Without dead ends: 409 [2021-11-23 17:04:13,124 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:13,130 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 75 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:13,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 290 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:04:13,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2021-11-23 17:04:13,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 407. [2021-11-23 17:04:13,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 406 states have (on average 1.5320197044334976) internal successors, (622), 406 states have internal predecessors, (622), 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) [2021-11-23 17:04:13,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 622 transitions. [2021-11-23 17:04:13,170 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 622 transitions. Word has length 61 [2021-11-23 17:04:13,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:13,171 INFO L470 AbstractCegarLoop]: Abstraction has 407 states and 622 transitions. [2021-11-23 17:04:13,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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) [2021-11-23 17:04:13,171 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 622 transitions. [2021-11-23 17:04:13,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 17:04:13,178 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:13,179 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:13,192 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-11-23 17:04:13,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:13,392 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:13,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:13,392 INFO L85 PathProgramCache]: Analyzing trace with hash 1534505571, now seen corresponding path program 1 times [2021-11-23 17:04:13,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:13,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [736630812] [2021-11-23 17:04:13,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:13,393 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:13,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:13,400 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:13,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:04:13,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:13,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:04:13,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:14,100 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:14,100 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:14,101 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:14,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [736630812] [2021-11-23 17:04:14,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [736630812] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:14,101 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:14,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:04:14,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801866548] [2021-11-23 17:04:14,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:14,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:04:14,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:14,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:04:14,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:04:14,103 INFO L87 Difference]: Start difference. First operand 407 states and 622 transitions. Second operand has 5 states, 5 states have (on average 12.4) internal successors, (62), 4 states have internal predecessors, (62), 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) [2021-11-23 17:04:14,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:14,188 INFO L93 Difference]: Finished difference Result 787 states and 1221 transitions. [2021-11-23 17:04:14,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:04:14,189 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.4) internal successors, (62), 4 states have internal predecessors, (62), 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 62 [2021-11-23 17:04:14,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:14,192 INFO L225 Difference]: With dead ends: 787 [2021-11-23 17:04:14,192 INFO L226 Difference]: Without dead ends: 417 [2021-11-23 17:04:14,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:04:14,194 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 37 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:14,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 199 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 18 Unchecked, 0.0s Time] [2021-11-23 17:04:14,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2021-11-23 17:04:14,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 417. [2021-11-23 17:04:14,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 416 states have (on average 1.5264423076923077) internal successors, (635), 416 states have internal predecessors, (635), 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) [2021-11-23 17:04:14,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 635 transitions. [2021-11-23 17:04:14,218 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 635 transitions. Word has length 62 [2021-11-23 17:04:14,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:14,218 INFO L470 AbstractCegarLoop]: Abstraction has 417 states and 635 transitions. [2021-11-23 17:04:14,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.4) internal successors, (62), 4 states have internal predecessors, (62), 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) [2021-11-23 17:04:14,218 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 635 transitions. [2021-11-23 17:04:14,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 17:04:14,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:14,220 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:14,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:14,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:14,437 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:14,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:14,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1894929336, now seen corresponding path program 1 times [2021-11-23 17:04:14,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:14,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [596286171] [2021-11-23 17:04:14,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:14,439 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:14,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:14,440 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:14,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:04:14,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:14,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:14,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:14,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:14,702 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:14,702 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:14,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [596286171] [2021-11-23 17:04:14,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [596286171] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:14,702 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:14,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:14,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301727700] [2021-11-23 17:04:14,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:14,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:14,703 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:14,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:14,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:14,704 INFO L87 Difference]: Start difference. First operand 417 states and 635 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 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) [2021-11-23 17:04:14,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:14,762 INFO L93 Difference]: Finished difference Result 1093 states and 1701 transitions. [2021-11-23 17:04:14,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:14,763 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 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 62 [2021-11-23 17:04:14,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:14,769 INFO L225 Difference]: With dead ends: 1093 [2021-11-23 17:04:14,769 INFO L226 Difference]: Without dead ends: 723 [2021-11-23 17:04:14,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:14,771 INFO L933 BasicCegarLoop]: 184 mSDtfsCounter, 70 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:14,771 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 286 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:04:14,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 723 states. [2021-11-23 17:04:14,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 723 to 721. [2021-11-23 17:04:14,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 721 states, 720 states have (on average 1.5375) internal successors, (1107), 720 states have internal predecessors, (1107), 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) [2021-11-23 17:04:14,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 721 states to 721 states and 1107 transitions. [2021-11-23 17:04:14,817 INFO L78 Accepts]: Start accepts. Automaton has 721 states and 1107 transitions. Word has length 62 [2021-11-23 17:04:14,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:14,818 INFO L470 AbstractCegarLoop]: Abstraction has 721 states and 1107 transitions. [2021-11-23 17:04:14,818 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 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) [2021-11-23 17:04:14,818 INFO L276 IsEmpty]: Start isEmpty. Operand 721 states and 1107 transitions. [2021-11-23 17:04:14,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:04:14,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:14,819 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:14,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:15,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:15,034 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:15,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:15,035 INFO L85 PathProgramCache]: Analyzing trace with hash 798409487, now seen corresponding path program 1 times [2021-11-23 17:04:15,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:15,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [174856161] [2021-11-23 17:04:15,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:15,036 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:15,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:15,037 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:15,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:04:15,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:15,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:15,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:15,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:15,327 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:15,327 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:15,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [174856161] [2021-11-23 17:04:15,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [174856161] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:15,328 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:15,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:15,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023589316] [2021-11-23 17:04:15,328 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:15,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:15,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:15,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:15,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:15,330 INFO L87 Difference]: Start difference. First operand 721 states and 1107 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 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) [2021-11-23 17:04:15,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:15,426 INFO L93 Difference]: Finished difference Result 1941 states and 3013 transitions. [2021-11-23 17:04:15,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:15,427 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 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 63 [2021-11-23 17:04:15,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:15,437 INFO L225 Difference]: With dead ends: 1941 [2021-11-23 17:04:15,438 INFO L226 Difference]: Without dead ends: 1267 [2021-11-23 17:04:15,440 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:15,441 INFO L933 BasicCegarLoop]: 176 mSDtfsCounter, 65 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:15,441 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 282 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:04:15,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1267 states. [2021-11-23 17:04:15,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1267 to 1265. [2021-11-23 17:04:15,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1265 states, 1264 states have (on average 1.5340189873417722) internal successors, (1939), 1264 states have internal predecessors, (1939), 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) [2021-11-23 17:04:15,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1265 states to 1265 states and 1939 transitions. [2021-11-23 17:04:15,539 INFO L78 Accepts]: Start accepts. Automaton has 1265 states and 1939 transitions. Word has length 63 [2021-11-23 17:04:15,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:15,540 INFO L470 AbstractCegarLoop]: Abstraction has 1265 states and 1939 transitions. [2021-11-23 17:04:15,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 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) [2021-11-23 17:04:15,540 INFO L276 IsEmpty]: Start isEmpty. Operand 1265 states and 1939 transitions. [2021-11-23 17:04:15,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:04:15,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:15,541 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:15,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:15,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:15,754 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:15,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:15,754 INFO L85 PathProgramCache]: Analyzing trace with hash 1887796474, now seen corresponding path program 1 times [2021-11-23 17:04:15,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:15,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1614631801] [2021-11-23 17:04:15,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:15,755 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:15,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:15,756 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:15,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:04:15,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:15,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:04:15,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:16,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:16,427 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:16,427 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:16,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1614631801] [2021-11-23 17:04:16,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1614631801] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:16,428 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:16,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:04:16,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448566639] [2021-11-23 17:04:16,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:16,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:04:16,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:16,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:04:16,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:04:16,430 INFO L87 Difference]: Start difference. First operand 1265 states and 1939 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 4 states have internal predecessors, (64), 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) [2021-11-23 17:04:16,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:16,582 INFO L93 Difference]: Finished difference Result 2493 states and 3842 transitions. [2021-11-23 17:04:16,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:04:16,583 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 4 states have internal predecessors, (64), 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 64 [2021-11-23 17:04:16,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:16,593 INFO L225 Difference]: With dead ends: 2493 [2021-11-23 17:04:16,593 INFO L226 Difference]: Without dead ends: 1275 [2021-11-23 17:04:16,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:04:16,596 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 22 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:16,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 302 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 49 Unchecked, 0.1s Time] [2021-11-23 17:04:16,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1275 states. [2021-11-23 17:04:16,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1275 to 1275. [2021-11-23 17:04:16,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1275 states, 1274 states have (on average 1.532182103610675) internal successors, (1952), 1274 states have internal predecessors, (1952), 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) [2021-11-23 17:04:16,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1275 states to 1275 states and 1952 transitions. [2021-11-23 17:04:16,680 INFO L78 Accepts]: Start accepts. Automaton has 1275 states and 1952 transitions. Word has length 64 [2021-11-23 17:04:16,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:16,680 INFO L470 AbstractCegarLoop]: Abstraction has 1275 states and 1952 transitions. [2021-11-23 17:04:16,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 4 states have internal predecessors, (64), 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) [2021-11-23 17:04:16,681 INFO L276 IsEmpty]: Start isEmpty. Operand 1275 states and 1952 transitions. [2021-11-23 17:04:16,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:04:16,681 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:16,682 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:16,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:16,895 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:16,895 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:16,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:16,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1133302817, now seen corresponding path program 1 times [2021-11-23 17:04:16,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:16,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [115514539] [2021-11-23 17:04:16,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:16,897 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:16,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:16,898 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:16,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:04:17,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:17,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:04:17,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:18,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:18,145 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:18,145 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:18,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [115514539] [2021-11-23 17:04:18,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [115514539] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:18,146 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:18,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:04:18,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415445499] [2021-11-23 17:04:18,147 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:18,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:04:18,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:18,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:04:18,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:04:18,148 INFO L87 Difference]: Start difference. First operand 1275 states and 1952 transitions. Second operand has 7 states, 7 states have (on average 9.142857142857142) internal successors, (64), 7 states have internal predecessors, (64), 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) [2021-11-23 17:04:18,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:18,893 INFO L93 Difference]: Finished difference Result 8583 states and 13286 transitions. [2021-11-23 17:04:18,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:04:18,894 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 9.142857142857142) internal successors, (64), 7 states have internal predecessors, (64), 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 64 [2021-11-23 17:04:18,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:18,960 INFO L225 Difference]: With dead ends: 8583 [2021-11-23 17:04:18,961 INFO L226 Difference]: Without dead ends: 7365 [2021-11-23 17:04:18,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:04:18,974 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 660 mSDsluCounter, 561 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 660 SdHoareTripleChecker+Valid, 684 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:18,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [660 Valid, 684 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 17:04:18,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7365 states. [2021-11-23 17:04:19,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7365 to 3707. [2021-11-23 17:04:19,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3707 states, 3706 states have (on average 1.5196977873718294) internal successors, (5632), 3706 states have internal predecessors, (5632), 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) [2021-11-23 17:04:19,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3707 states to 3707 states and 5632 transitions. [2021-11-23 17:04:19,421 INFO L78 Accepts]: Start accepts. Automaton has 3707 states and 5632 transitions. Word has length 64 [2021-11-23 17:04:19,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:19,421 INFO L470 AbstractCegarLoop]: Abstraction has 3707 states and 5632 transitions. [2021-11-23 17:04:19,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 9.142857142857142) internal successors, (64), 7 states have internal predecessors, (64), 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) [2021-11-23 17:04:19,422 INFO L276 IsEmpty]: Start isEmpty. Operand 3707 states and 5632 transitions. [2021-11-23 17:04:19,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:04:19,423 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:19,423 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:19,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:19,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:19,638 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:19,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:19,639 INFO L85 PathProgramCache]: Analyzing trace with hash 895865115, now seen corresponding path program 1 times [2021-11-23 17:04:19,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:19,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [927787473] [2021-11-23 17:04:19,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:19,640 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:19,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:19,641 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:19,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:04:19,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:19,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:19,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:19,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:19,965 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:19,965 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:19,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [927787473] [2021-11-23 17:04:19,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [927787473] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:19,965 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:19,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:19,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839614177] [2021-11-23 17:04:19,966 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:19,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:19,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:19,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:19,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:19,967 INFO L87 Difference]: Start difference. First operand 3707 states and 5632 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 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) [2021-11-23 17:04:20,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:20,390 INFO L93 Difference]: Finished difference Result 9119 states and 13874 transitions. [2021-11-23 17:04:20,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:20,395 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 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 66 [2021-11-23 17:04:20,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:20,430 INFO L225 Difference]: With dead ends: 9119 [2021-11-23 17:04:20,430 INFO L226 Difference]: Without dead ends: 5469 [2021-11-23 17:04:20,437 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:20,438 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 56 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:20,439 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 250 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:04:20,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5469 states. [2021-11-23 17:04:20,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5469 to 5467. [2021-11-23 17:04:20,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5467 states, 5466 states have (on average 1.504573728503476) internal successors, (8224), 5466 states have internal predecessors, (8224), 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) [2021-11-23 17:04:20,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5467 states to 5467 states and 8224 transitions. [2021-11-23 17:04:20,933 INFO L78 Accepts]: Start accepts. Automaton has 5467 states and 8224 transitions. Word has length 66 [2021-11-23 17:04:20,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:20,933 INFO L470 AbstractCegarLoop]: Abstraction has 5467 states and 8224 transitions. [2021-11-23 17:04:20,933 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 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) [2021-11-23 17:04:20,934 INFO L276 IsEmpty]: Start isEmpty. Operand 5467 states and 8224 transitions. [2021-11-23 17:04:20,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:04:20,935 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:20,935 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:20,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:21,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:21,149 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:21,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:21,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1643779557, now seen corresponding path program 1 times [2021-11-23 17:04:21,150 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:21,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1484246709] [2021-11-23 17:04:21,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:21,151 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:21,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:21,153 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:21,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:04:21,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:21,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:04:21,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:21,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:21,480 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:21,480 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:21,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1484246709] [2021-11-23 17:04:21,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1484246709] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:21,481 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:21,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:04:21,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928815037] [2021-11-23 17:04:21,481 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:21,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:04:21,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:21,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:04:21,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:04:21,484 INFO L87 Difference]: Start difference. First operand 5467 states and 8224 transitions. Second operand has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 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) [2021-11-23 17:04:22,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:22,297 INFO L93 Difference]: Finished difference Result 10043 states and 15031 transitions. [2021-11-23 17:04:22,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:04:22,299 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 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 67 [2021-11-23 17:04:22,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:22,385 INFO L225 Difference]: With dead ends: 10043 [2021-11-23 17:04:22,385 INFO L226 Difference]: Without dead ends: 10041 [2021-11-23 17:04:22,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:04:22,390 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 174 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:22,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 421 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:04:22,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10041 states. [2021-11-23 17:04:22,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10041 to 5691. [2021-11-23 17:04:22,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5691 states, 5690 states have (on average 1.4818980667838313) internal successors, (8432), 5690 states have internal predecessors, (8432), 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) [2021-11-23 17:04:23,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5691 states to 5691 states and 8432 transitions. [2021-11-23 17:04:23,021 INFO L78 Accepts]: Start accepts. Automaton has 5691 states and 8432 transitions. Word has length 67 [2021-11-23 17:04:23,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:23,022 INFO L470 AbstractCegarLoop]: Abstraction has 5691 states and 8432 transitions. [2021-11-23 17:04:23,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 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) [2021-11-23 17:04:23,022 INFO L276 IsEmpty]: Start isEmpty. Operand 5691 states and 8432 transitions. [2021-11-23 17:04:23,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 17:04:23,026 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:23,027 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:23,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:23,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:23,251 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:23,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:23,251 INFO L85 PathProgramCache]: Analyzing trace with hash 2083961666, now seen corresponding path program 1 times [2021-11-23 17:04:23,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:23,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2049245723] [2021-11-23 17:04:23,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:23,253 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:23,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:23,254 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:23,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:04:23,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:23,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:23,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:24,439 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:24,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:25,339 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:25,340 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:25,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2049245723] [2021-11-23 17:04:25,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2049245723] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:25,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [480992651] [2021-11-23 17:04:25,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:25,341 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:25,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:25,343 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:25,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:04:25,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:25,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:25,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:26,396 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:26,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:27,050 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:27,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [480992651] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:27,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942335659] [2021-11-23 17:04:27,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:27,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:27,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:27,059 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:27,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 17:04:27,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:27,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:27,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:28,001 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:28,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:28,800 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:28,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1942335659] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:28,800 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:04:28,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:04:28,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951516487] [2021-11-23 17:04:28,802 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:04:28,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:04:28,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:28,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:04:28,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:04:28,804 INFO L87 Difference]: Start difference. First operand 5691 states and 8432 transitions. Second operand has 16 states, 16 states have (on average 10.125) internal successors, (162), 15 states have internal predecessors, (162), 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) [2021-11-23 17:04:29,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:29,348 INFO L93 Difference]: Finished difference Result 9546 states and 14210 transitions. [2021-11-23 17:04:29,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:04:29,349 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.125) internal successors, (162), 15 states have internal predecessors, (162), 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 93 [2021-11-23 17:04:29,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:29,364 INFO L225 Difference]: With dead ends: 9546 [2021-11-23 17:04:29,364 INFO L226 Difference]: Without dead ends: 5704 [2021-11-23 17:04:29,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:04:29,374 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 88 mSDsluCounter, 679 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 780 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:29,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 780 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 54 Invalid, 0 Unknown, 65 Unchecked, 0.1s Time] [2021-11-23 17:04:29,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5704 states. [2021-11-23 17:04:29,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5704 to 5703. [2021-11-23 17:04:29,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5703 states, 5702 states have (on average 1.4812346545071904) internal successors, (8446), 5702 states have internal predecessors, (8446), 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) [2021-11-23 17:04:29,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5703 states to 5703 states and 8446 transitions. [2021-11-23 17:04:29,916 INFO L78 Accepts]: Start accepts. Automaton has 5703 states and 8446 transitions. Word has length 93 [2021-11-23 17:04:29,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:29,916 INFO L470 AbstractCegarLoop]: Abstraction has 5703 states and 8446 transitions. [2021-11-23 17:04:29,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.125) internal successors, (162), 15 states have internal predecessors, (162), 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) [2021-11-23 17:04:29,918 INFO L276 IsEmpty]: Start isEmpty. Operand 5703 states and 8446 transitions. [2021-11-23 17:04:29,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 17:04:29,922 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:29,922 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:29,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:30,165 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:30,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:30,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:30,540 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:30,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:30,541 INFO L85 PathProgramCache]: Analyzing trace with hash -235568196, now seen corresponding path program 1 times [2021-11-23 17:04:30,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:30,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1582957541] [2021-11-23 17:04:30,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:30,542 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:30,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:30,543 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:30,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:04:30,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:30,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:30,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:32,167 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:32,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:32,519 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:32,520 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:32,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1582957541] [2021-11-23 17:04:32,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1582957541] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:32,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [563421686] [2021-11-23 17:04:32,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:32,521 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:32,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:32,534 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:32,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 17:04:32,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:32,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:32,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:34,020 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:34,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:34,349 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:34,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [563421686] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:34,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946352773] [2021-11-23 17:04:34,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:34,349 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:34,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:34,351 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:34,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 17:04:34,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:34,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:34,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:35,911 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:35,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:36,220 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:36,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1946352773] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:36,221 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:04:36,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:04:36,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981576536] [2021-11-23 17:04:36,221 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:04:36,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:04:36,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:36,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:04:36,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:04:36,224 INFO L87 Difference]: Start difference. First operand 5703 states and 8446 transitions. Second operand has 16 states, 16 states have (on average 10.5) internal successors, (168), 15 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) [2021-11-23 17:04:36,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:36,887 INFO L93 Difference]: Finished difference Result 9702 states and 14373 transitions. [2021-11-23 17:04:36,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:04:36,887 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.5) internal successors, (168), 15 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) Word has length 93 [2021-11-23 17:04:36,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:36,900 INFO L225 Difference]: With dead ends: 9702 [2021-11-23 17:04:36,901 INFO L226 Difference]: Without dead ends: 5860 [2021-11-23 17:04:36,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 538 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:04:36,908 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 136 mSDsluCounter, 615 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 714 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:36,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 714 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 124 Invalid, 0 Unknown, 133 Unchecked, 0.1s Time] [2021-11-23 17:04:36,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5860 states. [2021-11-23 17:04:37,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5860 to 5713. [2021-11-23 17:04:37,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5713 states, 5712 states have (on average 1.48109243697479) internal successors, (8460), 5712 states have internal predecessors, (8460), 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) [2021-11-23 17:04:37,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5713 states to 5713 states and 8460 transitions. [2021-11-23 17:04:37,353 INFO L78 Accepts]: Start accepts. Automaton has 5713 states and 8460 transitions. Word has length 93 [2021-11-23 17:04:37,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:37,353 INFO L470 AbstractCegarLoop]: Abstraction has 5713 states and 8460 transitions. [2021-11-23 17:04:37,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.5) internal successors, (168), 15 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) [2021-11-23 17:04:37,354 INFO L276 IsEmpty]: Start isEmpty. Operand 5713 states and 8460 transitions. [2021-11-23 17:04:37,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 17:04:37,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:37,358 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:37,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:37,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:37,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:37,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:37,973 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:37,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:37,973 INFO L85 PathProgramCache]: Analyzing trace with hash -1425904030, now seen corresponding path program 1 times [2021-11-23 17:04:37,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:37,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1403650379] [2021-11-23 17:04:37,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:37,974 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:37,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:37,975 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:37,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:04:38,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:38,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:04:38,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:38,584 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:04:38,584 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:38,585 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:38,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1403650379] [2021-11-23 17:04:38,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1403650379] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:38,585 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:38,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:04:38,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467296262] [2021-11-23 17:04:38,586 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:38,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:04:38,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:38,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:04:38,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:04:38,588 INFO L87 Difference]: Start difference. First operand 5713 states and 8460 transitions. Second operand has 5 states, 5 states have (on average 18.0) internal successors, (90), 4 states have internal predecessors, (90), 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) [2021-11-23 17:04:38,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:38,949 INFO L93 Difference]: Finished difference Result 11347 states and 16829 transitions. [2021-11-23 17:04:38,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:04:38,950 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 18.0) internal successors, (90), 4 states have internal predecessors, (90), 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 93 [2021-11-23 17:04:38,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:38,966 INFO L225 Difference]: With dead ends: 11347 [2021-11-23 17:04:38,966 INFO L226 Difference]: Without dead ends: 5713 [2021-11-23 17:04:38,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:04:38,977 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 21 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:38,977 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 299 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 49 Unchecked, 0.1s Time] [2021-11-23 17:04:38,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5713 states. [2021-11-23 17:04:39,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5713 to 5713. [2021-11-23 17:04:39,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5713 states, 5712 states have (on average 1.4809173669467788) internal successors, (8459), 5712 states have internal predecessors, (8459), 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) [2021-11-23 17:04:39,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5713 states to 5713 states and 8459 transitions. [2021-11-23 17:04:39,395 INFO L78 Accepts]: Start accepts. Automaton has 5713 states and 8459 transitions. Word has length 93 [2021-11-23 17:04:39,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:39,396 INFO L470 AbstractCegarLoop]: Abstraction has 5713 states and 8459 transitions. [2021-11-23 17:04:39,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 18.0) internal successors, (90), 4 states have internal predecessors, (90), 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) [2021-11-23 17:04:39,396 INFO L276 IsEmpty]: Start isEmpty. Operand 5713 states and 8459 transitions. [2021-11-23 17:04:39,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 17:04:39,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:39,400 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:39,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:39,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:39,613 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:39,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:39,613 INFO L85 PathProgramCache]: Analyzing trace with hash 8810279, now seen corresponding path program 1 times [2021-11-23 17:04:39,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:39,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [956562479] [2021-11-23 17:04:39,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:39,614 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:39,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:39,615 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:39,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:04:39,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:39,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:04:39,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:40,215 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:04:40,216 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:40,216 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:40,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [956562479] [2021-11-23 17:04:40,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [956562479] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:40,216 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:40,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:04:40,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339216687] [2021-11-23 17:04:40,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:40,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:04:40,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:40,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:04:40,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:04:40,225 INFO L87 Difference]: Start difference. First operand 5713 states and 8459 transitions. Second operand has 5 states, 5 states have (on average 17.6) internal successors, (88), 4 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) [2021-11-23 17:04:40,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:40,644 INFO L93 Difference]: Finished difference Result 11347 states and 16828 transitions. [2021-11-23 17:04:40,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:04:40,644 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.6) internal successors, (88), 4 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) Word has length 93 [2021-11-23 17:04:40,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:40,658 INFO L225 Difference]: With dead ends: 11347 [2021-11-23 17:04:40,658 INFO L226 Difference]: Without dead ends: 5713 [2021-11-23 17:04:40,666 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:04:40,667 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 28 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:40,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 295 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 76 Invalid, 0 Unknown, 49 Unchecked, 0.1s Time] [2021-11-23 17:04:40,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5713 states. [2021-11-23 17:04:41,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5713 to 5713. [2021-11-23 17:04:41,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5713 states, 5712 states have (on average 1.4807422969187676) internal successors, (8458), 5712 states have internal predecessors, (8458), 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) [2021-11-23 17:04:41,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5713 states to 5713 states and 8458 transitions. [2021-11-23 17:04:41,084 INFO L78 Accepts]: Start accepts. Automaton has 5713 states and 8458 transitions. Word has length 93 [2021-11-23 17:04:41,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:41,085 INFO L470 AbstractCegarLoop]: Abstraction has 5713 states and 8458 transitions. [2021-11-23 17:04:41,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.6) internal successors, (88), 4 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) [2021-11-23 17:04:41,085 INFO L276 IsEmpty]: Start isEmpty. Operand 5713 states and 8458 transitions. [2021-11-23 17:04:41,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:04:41,089 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:41,090 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:41,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:41,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:41,303 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:41,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:41,304 INFO L85 PathProgramCache]: Analyzing trace with hash -943846307, now seen corresponding path program 1 times [2021-11-23 17:04:41,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:41,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [499242521] [2021-11-23 17:04:41,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:41,305 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:41,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:41,306 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:41,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:04:41,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:41,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:41,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:41,602 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:04:41,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:41,602 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:41,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [499242521] [2021-11-23 17:04:41,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [499242521] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:41,603 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:41,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:41,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196097299] [2021-11-23 17:04:41,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:41,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:41,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:41,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:41,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:41,604 INFO L87 Difference]: Start difference. First operand 5713 states and 8458 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 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) [2021-11-23 17:04:42,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:42,017 INFO L93 Difference]: Finished difference Result 11347 states and 16827 transitions. [2021-11-23 17:04:42,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:42,018 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 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) Word has length 94 [2021-11-23 17:04:42,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:42,033 INFO L225 Difference]: With dead ends: 11347 [2021-11-23 17:04:42,033 INFO L226 Difference]: Without dead ends: 5713 [2021-11-23 17:04:42,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:42,042 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 89 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:42,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 183 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:04:42,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5713 states. [2021-11-23 17:04:42,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5713 to 5713. [2021-11-23 17:04:42,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5713 states, 5712 states have (on average 1.4637605042016806) internal successors, (8361), 5712 states have internal predecessors, (8361), 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) [2021-11-23 17:04:42,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5713 states to 5713 states and 8361 transitions. [2021-11-23 17:04:42,410 INFO L78 Accepts]: Start accepts. Automaton has 5713 states and 8361 transitions. Word has length 94 [2021-11-23 17:04:42,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:42,410 INFO L470 AbstractCegarLoop]: Abstraction has 5713 states and 8361 transitions. [2021-11-23 17:04:42,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 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) [2021-11-23 17:04:42,411 INFO L276 IsEmpty]: Start isEmpty. Operand 5713 states and 8361 transitions. [2021-11-23 17:04:42,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:04:42,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:42,415 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:42,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:42,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:42,630 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:42,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:42,631 INFO L85 PathProgramCache]: Analyzing trace with hash 1229926892, now seen corresponding path program 1 times [2021-11-23 17:04:42,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:42,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [518535326] [2021-11-23 17:04:42,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:42,632 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:42,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:42,633 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:42,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:04:42,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:42,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:42,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:42,944 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:04:42,944 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:42,944 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:42,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [518535326] [2021-11-23 17:04:42,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [518535326] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:42,945 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:42,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:42,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891565369] [2021-11-23 17:04:42,946 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:42,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:42,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:42,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:42,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:42,948 INFO L87 Difference]: Start difference. First operand 5713 states and 8361 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 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) [2021-11-23 17:04:43,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:43,374 INFO L93 Difference]: Finished difference Result 11347 states and 16634 transitions. [2021-11-23 17:04:43,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:43,375 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 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 94 [2021-11-23 17:04:43,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:43,387 INFO L225 Difference]: With dead ends: 11347 [2021-11-23 17:04:43,387 INFO L226 Difference]: Without dead ends: 5713 [2021-11-23 17:04:43,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:43,395 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 78 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:43,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 152 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:04:43,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5713 states. [2021-11-23 17:04:43,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5713 to 5713. [2021-11-23 17:04:43,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5713 states, 5712 states have (on average 1.4509803921568627) internal successors, (8288), 5712 states have internal predecessors, (8288), 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) [2021-11-23 17:04:43,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5713 states to 5713 states and 8288 transitions. [2021-11-23 17:04:43,997 INFO L78 Accepts]: Start accepts. Automaton has 5713 states and 8288 transitions. Word has length 94 [2021-11-23 17:04:43,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:43,998 INFO L470 AbstractCegarLoop]: Abstraction has 5713 states and 8288 transitions. [2021-11-23 17:04:43,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 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) [2021-11-23 17:04:43,998 INFO L276 IsEmpty]: Start isEmpty. Operand 5713 states and 8288 transitions. [2021-11-23 17:04:44,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:04:44,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:44,003 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:44,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:44,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:44,217 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:44,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:44,217 INFO L85 PathProgramCache]: Analyzing trace with hash -240834607, now seen corresponding path program 1 times [2021-11-23 17:04:44,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:44,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1262304135] [2021-11-23 17:04:44,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:44,218 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:44,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:44,219 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:44,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:04:44,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:44,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:44,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:44,535 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:44,536 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:44,536 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:44,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1262304135] [2021-11-23 17:04:44,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1262304135] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:44,536 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:44,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:44,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025098143] [2021-11-23 17:04:44,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:44,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:44,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:44,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:44,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:44,538 INFO L87 Difference]: Start difference. First operand 5713 states and 8288 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 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) [2021-11-23 17:04:44,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:44,824 INFO L93 Difference]: Finished difference Result 11349 states and 16490 transitions. [2021-11-23 17:04:44,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:44,824 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 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 94 [2021-11-23 17:04:44,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:44,832 INFO L225 Difference]: With dead ends: 11349 [2021-11-23 17:04:44,832 INFO L226 Difference]: Without dead ends: 5715 [2021-11-23 17:04:44,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:44,839 INFO L933 BasicCegarLoop]: 164 mSDtfsCounter, 56 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:44,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 278 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:04:44,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5715 states. [2021-11-23 17:04:45,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5715 to 5713. [2021-11-23 17:04:45,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5713 states, 5712 states have (on average 1.4380252100840336) internal successors, (8214), 5712 states have internal predecessors, (8214), 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) [2021-11-23 17:04:45,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5713 states to 5713 states and 8214 transitions. [2021-11-23 17:04:45,221 INFO L78 Accepts]: Start accepts. Automaton has 5713 states and 8214 transitions. Word has length 94 [2021-11-23 17:04:45,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:45,222 INFO L470 AbstractCegarLoop]: Abstraction has 5713 states and 8214 transitions. [2021-11-23 17:04:45,222 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 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) [2021-11-23 17:04:45,222 INFO L276 IsEmpty]: Start isEmpty. Operand 5713 states and 8214 transitions. [2021-11-23 17:04:45,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:04:45,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:45,225 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:45,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:45,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:45,439 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:45,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:45,440 INFO L85 PathProgramCache]: Analyzing trace with hash -1500204463, now seen corresponding path program 1 times [2021-11-23 17:04:45,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:45,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1845964139] [2021-11-23 17:04:45,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:45,440 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:45,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:45,441 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:45,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:04:45,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:45,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:45,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:47,044 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:47,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:47,587 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:47,588 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:47,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1845964139] [2021-11-23 17:04:47,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1845964139] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:47,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1373422009] [2021-11-23 17:04:47,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:47,589 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:47,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:47,599 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:47,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 17:04:47,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:47,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:47,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:49,172 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:49,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:49,590 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:49,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1373422009] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:49,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342717895] [2021-11-23 17:04:49,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:49,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:49,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:49,595 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:49,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 17:04:49,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:49,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:49,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:51,253 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:51,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:51,662 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:51,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342717895] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:51,662 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:04:51,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:04:51,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639829929] [2021-11-23 17:04:51,663 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:04:51,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:04:51,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:51,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:04:51,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:04:51,665 INFO L87 Difference]: Start difference. First operand 5713 states and 8214 transitions. Second operand has 16 states, 16 states have (on average 10.875) internal successors, (174), 15 states have internal predecessors, (174), 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) [2021-11-23 17:04:52,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:52,218 INFO L93 Difference]: Finished difference Result 9722 states and 14013 transitions. [2021-11-23 17:04:52,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:04:52,218 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.875) internal successors, (174), 15 states have internal predecessors, (174), 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 94 [2021-11-23 17:04:52,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:52,224 INFO L225 Difference]: With dead ends: 9722 [2021-11-23 17:04:52,225 INFO L226 Difference]: Without dead ends: 5880 [2021-11-23 17:04:52,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 562 GetRequests, 544 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:04:52,230 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 159 mSDsluCounter, 670 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 770 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 166 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:52,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 770 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 129 Invalid, 0 Unknown, 166 Unchecked, 0.1s Time] [2021-11-23 17:04:52,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5880 states. [2021-11-23 17:04:52,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5880 to 5725. [2021-11-23 17:04:52,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5725 states, 5724 states have (on average 1.4381551362683438) internal successors, (8232), 5724 states have internal predecessors, (8232), 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) [2021-11-23 17:04:52,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5725 states to 5725 states and 8232 transitions. [2021-11-23 17:04:52,589 INFO L78 Accepts]: Start accepts. Automaton has 5725 states and 8232 transitions. Word has length 94 [2021-11-23 17:04:52,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:52,590 INFO L470 AbstractCegarLoop]: Abstraction has 5725 states and 8232 transitions. [2021-11-23 17:04:52,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.875) internal successors, (174), 15 states have internal predecessors, (174), 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) [2021-11-23 17:04:52,590 INFO L276 IsEmpty]: Start isEmpty. Operand 5725 states and 8232 transitions. [2021-11-23 17:04:52,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:04:52,593 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:52,593 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:52,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:52,814 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Ended with exit code 0 [2021-11-23 17:04:53,008 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2021-11-23 17:04:53,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:53,207 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:53,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:53,207 INFO L85 PathProgramCache]: Analyzing trace with hash -1607306609, now seen corresponding path program 1 times [2021-11-23 17:04:53,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:53,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1868677216] [2021-11-23 17:04:53,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:53,208 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:53,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:53,209 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:53,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:04:53,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:53,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:53,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:53,465 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:53,465 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:53,465 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:53,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1868677216] [2021-11-23 17:04:53,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1868677216] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:53,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:53,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:53,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41946993] [2021-11-23 17:04:53,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:53,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:53,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:53,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:53,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:53,468 INFO L87 Difference]: Start difference. First operand 5725 states and 8232 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 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) [2021-11-23 17:04:53,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:53,596 INFO L93 Difference]: Finished difference Result 7678 states and 11077 transitions. [2021-11-23 17:04:53,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:53,597 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 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 94 [2021-11-23 17:04:53,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:53,599 INFO L225 Difference]: With dead ends: 7678 [2021-11-23 17:04:53,599 INFO L226 Difference]: Without dead ends: 2044 [2021-11-23 17:04:53,604 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:53,605 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 50 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:53,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 266 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:04:53,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2044 states. [2021-11-23 17:04:53,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2044 to 2038. [2021-11-23 17:04:53,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2038 states, 2037 states have (on average 1.432007854688267) internal successors, (2917), 2037 states have internal predecessors, (2917), 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) [2021-11-23 17:04:53,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2038 states to 2038 states and 2917 transitions. [2021-11-23 17:04:53,720 INFO L78 Accepts]: Start accepts. Automaton has 2038 states and 2917 transitions. Word has length 94 [2021-11-23 17:04:53,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:53,720 INFO L470 AbstractCegarLoop]: Abstraction has 2038 states and 2917 transitions. [2021-11-23 17:04:53,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 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) [2021-11-23 17:04:53,721 INFO L276 IsEmpty]: Start isEmpty. Operand 2038 states and 2917 transitions. [2021-11-23 17:04:53,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:04:53,722 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:53,723 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:53,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:53,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:53,935 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:53,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:53,935 INFO L85 PathProgramCache]: Analyzing trace with hash -1669546181, now seen corresponding path program 1 times [2021-11-23 17:04:53,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:53,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [717549503] [2021-11-23 17:04:53,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:53,936 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:53,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:53,937 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:53,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:04:54,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:54,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:54,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:54,182 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:04:54,182 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:54,182 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:54,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [717549503] [2021-11-23 17:04:54,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [717549503] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:54,183 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:54,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:54,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154991077] [2021-11-23 17:04:54,183 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:54,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:54,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:54,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:54,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:54,184 INFO L87 Difference]: Start difference. First operand 2038 states and 2917 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 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) [2021-11-23 17:04:54,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:54,338 INFO L93 Difference]: Finished difference Result 3967 states and 5709 transitions. [2021-11-23 17:04:54,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:54,339 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 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 94 [2021-11-23 17:04:54,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:54,341 INFO L225 Difference]: With dead ends: 3967 [2021-11-23 17:04:54,341 INFO L226 Difference]: Without dead ends: 2038 [2021-11-23 17:04:54,344 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:54,345 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 67 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:54,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 120 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:04:54,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2038 states. [2021-11-23 17:04:54,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2038 to 2038. [2021-11-23 17:04:54,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2038 states, 2037 states have (on average 1.4192439862542956) internal successors, (2891), 2037 states have internal predecessors, (2891), 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) [2021-11-23 17:04:54,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2038 states to 2038 states and 2891 transitions. [2021-11-23 17:04:54,466 INFO L78 Accepts]: Start accepts. Automaton has 2038 states and 2891 transitions. Word has length 94 [2021-11-23 17:04:54,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:54,466 INFO L470 AbstractCegarLoop]: Abstraction has 2038 states and 2891 transitions. [2021-11-23 17:04:54,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 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) [2021-11-23 17:04:54,467 INFO L276 IsEmpty]: Start isEmpty. Operand 2038 states and 2891 transitions. [2021-11-23 17:04:54,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:04:54,468 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:54,468 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:54,492 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Ended with exit code 0 [2021-11-23 17:04:54,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:54,682 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:54,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:54,682 INFO L85 PathProgramCache]: Analyzing trace with hash 314788875, now seen corresponding path program 1 times [2021-11-23 17:04:54,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:54,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [756105451] [2021-11-23 17:04:54,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:54,683 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:54,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:54,684 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:54,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:04:54,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:54,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:54,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:54,943 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:04:54,943 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:54,943 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:54,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [756105451] [2021-11-23 17:04:54,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [756105451] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:54,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:54,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:54,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548985347] [2021-11-23 17:04:54,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:54,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:54,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:54,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:54,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:54,945 INFO L87 Difference]: Start difference. First operand 2038 states and 2891 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 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) [2021-11-23 17:04:55,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:55,107 INFO L93 Difference]: Finished difference Result 3973 states and 5666 transitions. [2021-11-23 17:04:55,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:55,108 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 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 94 [2021-11-23 17:04:55,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:55,110 INFO L225 Difference]: With dead ends: 3973 [2021-11-23 17:04:55,110 INFO L226 Difference]: Without dead ends: 2038 [2021-11-23 17:04:55,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:55,113 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 71 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:55,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 135 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:04:55,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2038 states. [2021-11-23 17:04:55,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2038 to 2038. [2021-11-23 17:04:55,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2038 states, 2037 states have (on average 1.4064801178203241) internal successors, (2865), 2037 states have internal predecessors, (2865), 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) [2021-11-23 17:04:55,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2038 states to 2038 states and 2865 transitions. [2021-11-23 17:04:55,264 INFO L78 Accepts]: Start accepts. Automaton has 2038 states and 2865 transitions. Word has length 94 [2021-11-23 17:04:55,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:55,264 INFO L470 AbstractCegarLoop]: Abstraction has 2038 states and 2865 transitions. [2021-11-23 17:04:55,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 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) [2021-11-23 17:04:55,265 INFO L276 IsEmpty]: Start isEmpty. Operand 2038 states and 2865 transitions. [2021-11-23 17:04:55,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:04:55,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:55,266 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:55,277 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:55,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:55,475 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:55,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:55,476 INFO L85 PathProgramCache]: Analyzing trace with hash 220959652, now seen corresponding path program 1 times [2021-11-23 17:04:55,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:55,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1717620786] [2021-11-23 17:04:55,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:55,476 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:55,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:55,477 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:55,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:04:55,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:55,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:55,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:55,710 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:04:55,710 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:55,711 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:55,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1717620786] [2021-11-23 17:04:55,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1717620786] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:55,711 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:04:55,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:04:55,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982233911] [2021-11-23 17:04:55,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:55,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:55,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:55,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:55,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:55,712 INFO L87 Difference]: Start difference. First operand 2038 states and 2865 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 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) [2021-11-23 17:04:55,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:55,904 INFO L93 Difference]: Finished difference Result 3960 states and 5602 transitions. [2021-11-23 17:04:55,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:55,905 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 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 94 [2021-11-23 17:04:55,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:55,907 INFO L225 Difference]: With dead ends: 3960 [2021-11-23 17:04:55,907 INFO L226 Difference]: Without dead ends: 2013 [2021-11-23 17:04:55,909 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:04:55,910 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 80 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:55,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 160 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:04:55,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2013 states. [2021-11-23 17:04:56,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2013 to 2013. [2021-11-23 17:04:56,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2013 states, 2012 states have (on average 1.3976143141153081) internal successors, (2812), 2012 states have internal predecessors, (2812), 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) [2021-11-23 17:04:56,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2013 states to 2013 states and 2812 transitions. [2021-11-23 17:04:56,027 INFO L78 Accepts]: Start accepts. Automaton has 2013 states and 2812 transitions. Word has length 94 [2021-11-23 17:04:56,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:56,028 INFO L470 AbstractCegarLoop]: Abstraction has 2013 states and 2812 transitions. [2021-11-23 17:04:56,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 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) [2021-11-23 17:04:56,028 INFO L276 IsEmpty]: Start isEmpty. Operand 2013 states and 2812 transitions. [2021-11-23 17:04:56,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 17:04:56,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:56,029 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:56,037 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Ended with exit code 0 [2021-11-23 17:04:56,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:56,230 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:56,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:56,230 INFO L85 PathProgramCache]: Analyzing trace with hash 101631355, now seen corresponding path program 1 times [2021-11-23 17:04:56,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:56,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1518290704] [2021-11-23 17:04:56,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:56,231 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:56,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:56,232 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:56,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:04:56,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:56,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:56,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:57,543 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:57,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:58,055 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:58,056 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:58,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1518290704] [2021-11-23 17:04:58,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1518290704] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:58,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1677978604] [2021-11-23 17:04:58,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:58,056 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:58,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:58,057 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:58,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 17:04:58,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:58,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:58,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:59,586 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:59,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:59,963 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:59,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1677978604] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:59,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608811804] [2021-11-23 17:04:59,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:59,964 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:59,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:59,965 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:59,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 17:05:00,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:00,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:05:00,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:01,243 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:01,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:01,664 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:01,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608811804] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:01,665 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:05:01,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:05:01,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608070392] [2021-11-23 17:05:01,665 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:05:01,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:05:01,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:01,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:05:01,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:05:01,667 INFO L87 Difference]: Start difference. First operand 2013 states and 2812 transitions. Second operand has 16 states, 16 states have (on average 11.25) internal successors, (180), 15 states have internal predecessors, (180), 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) [2021-11-23 17:05:02,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:02,011 INFO L93 Difference]: Finished difference Result 3951 states and 5553 transitions. [2021-11-23 17:05:02,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:05:02,012 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.25) internal successors, (180), 15 states have internal predecessors, (180), 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 95 [2021-11-23 17:05:02,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:02,014 INFO L225 Difference]: With dead ends: 3951 [2021-11-23 17:05:02,014 INFO L226 Difference]: Without dead ends: 2029 [2021-11-23 17:05:02,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 568 GetRequests, 550 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:05:02,018 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 109 mSDsluCounter, 663 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 759 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 85 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:02,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 759 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 91 Invalid, 0 Unknown, 85 Unchecked, 0.1s Time] [2021-11-23 17:05:02,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2029 states. [2021-11-23 17:05:02,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2029 to 2025. [2021-11-23 17:05:02,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2025 states, 2024 states have (on average 1.3982213438735178) internal successors, (2830), 2024 states have internal predecessors, (2830), 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) [2021-11-23 17:05:02,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2025 states to 2025 states and 2830 transitions. [2021-11-23 17:05:02,138 INFO L78 Accepts]: Start accepts. Automaton has 2025 states and 2830 transitions. Word has length 95 [2021-11-23 17:05:02,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:02,139 INFO L470 AbstractCegarLoop]: Abstraction has 2025 states and 2830 transitions. [2021-11-23 17:05:02,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.25) internal successors, (180), 15 states have internal predecessors, (180), 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) [2021-11-23 17:05:02,139 INFO L276 IsEmpty]: Start isEmpty. Operand 2025 states and 2830 transitions. [2021-11-23 17:05:02,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 17:05:02,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:02,141 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:02,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:02,357 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Ended with exit code 0 [2021-11-23 17:05:02,581 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-23 17:05:02,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:05:02,756 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:02,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:02,756 INFO L85 PathProgramCache]: Analyzing trace with hash -2067567978, now seen corresponding path program 1 times [2021-11-23 17:05:02,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:02,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [241350301] [2021-11-23 17:05:02,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:02,757 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:02,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:02,758 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:02,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:05:02,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:02,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:05:02,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:03,049 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:03,049 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:05:03,049 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:03,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [241350301] [2021-11-23 17:05:03,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [241350301] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:05:03,049 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:05:03,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:05:03,049 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830990489] [2021-11-23 17:05:03,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:05:03,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:05:03,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:03,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:05:03,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:05:03,051 INFO L87 Difference]: Start difference. First operand 2025 states and 2830 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 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) [2021-11-23 17:05:03,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:03,129 INFO L93 Difference]: Finished difference Result 2989 states and 4188 transitions. [2021-11-23 17:05:03,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:05:03,129 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 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 95 [2021-11-23 17:05:03,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:03,131 INFO L225 Difference]: With dead ends: 2989 [2021-11-23 17:05:03,131 INFO L226 Difference]: Without dead ends: 1067 [2021-11-23 17:05:03,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:05:03,134 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 42 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:03,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 248 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:05:03,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1067 states. [2021-11-23 17:05:03,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1067 to 1065. [2021-11-23 17:05:03,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1065 states, 1064 states have (on average 1.3721804511278195) internal successors, (1460), 1064 states have internal predecessors, (1460), 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) [2021-11-23 17:05:03,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1065 states to 1065 states and 1460 transitions. [2021-11-23 17:05:03,200 INFO L78 Accepts]: Start accepts. Automaton has 1065 states and 1460 transitions. Word has length 95 [2021-11-23 17:05:03,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:03,200 INFO L470 AbstractCegarLoop]: Abstraction has 1065 states and 1460 transitions. [2021-11-23 17:05:03,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 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) [2021-11-23 17:05:03,201 INFO L276 IsEmpty]: Start isEmpty. Operand 1065 states and 1460 transitions. [2021-11-23 17:05:03,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:05:03,201 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:03,202 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:03,217 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-23 17:05:03,414 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:05:03,414 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:03,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:03,415 INFO L85 PathProgramCache]: Analyzing trace with hash -764377156, now seen corresponding path program 1 times [2021-11-23 17:05:03,415 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:03,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1016764473] [2021-11-23 17:05:03,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:03,416 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:03,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:03,417 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:03,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:05:03,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:03,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:05:03,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:04,836 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:04,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:05,416 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:05,416 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:05,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1016764473] [2021-11-23 17:05:05,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1016764473] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:05,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [468671531] [2021-11-23 17:05:05,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:05,417 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:05:05,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:05:05,418 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:05:05,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-23 17:05:05,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:05,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:05:05,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:06,929 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:06,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:07,464 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:07,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [468671531] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:07,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193215657] [2021-11-23 17:05:07,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:07,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:05:07,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:05:07,465 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:05:07,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 17:05:07,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:07,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:05:07,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:08,979 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:08,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:09,559 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:09,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193215657] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:09,560 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:05:09,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:05:09,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967832080] [2021-11-23 17:05:09,560 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:05:09,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:05:09,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:09,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:05:09,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:05:09,562 INFO L87 Difference]: Start difference. First operand 1065 states and 1460 transitions. Second operand has 16 states, 16 states have (on average 11.625) internal successors, (186), 15 states have internal predecessors, (186), 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) [2021-11-23 17:05:09,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:09,807 INFO L93 Difference]: Finished difference Result 2043 states and 2833 transitions. [2021-11-23 17:05:09,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:05:09,807 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.625) internal successors, (186), 15 states have internal predecessors, (186), 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 96 [2021-11-23 17:05:09,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:09,809 INFO L225 Difference]: With dead ends: 2043 [2021-11-23 17:05:09,809 INFO L226 Difference]: Without dead ends: 1081 [2021-11-23 17:05:09,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 574 GetRequests, 556 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:05:09,811 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 136 mSDsluCounter, 785 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 879 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:09,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 879 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 65 Invalid, 0 Unknown, 93 Unchecked, 0.1s Time] [2021-11-23 17:05:09,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1081 states. [2021-11-23 17:05:09,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1081 to 1077. [2021-11-23 17:05:09,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1077 states, 1076 states have (on average 1.3736059479553904) internal successors, (1478), 1076 states have internal predecessors, (1478), 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) [2021-11-23 17:05:09,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1077 states to 1077 states and 1478 transitions. [2021-11-23 17:05:09,892 INFO L78 Accepts]: Start accepts. Automaton has 1077 states and 1478 transitions. Word has length 96 [2021-11-23 17:05:09,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:09,893 INFO L470 AbstractCegarLoop]: Abstraction has 1077 states and 1478 transitions. [2021-11-23 17:05:09,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.625) internal successors, (186), 15 states have internal predecessors, (186), 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) [2021-11-23 17:05:09,893 INFO L276 IsEmpty]: Start isEmpty. Operand 1077 states and 1478 transitions. [2021-11-23 17:05:09,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:05:09,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:09,895 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:09,928 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-23 17:05:10,120 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2021-11-23 17:05:10,313 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 0 [2021-11-23 17:05:10,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:05:10,511 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:10,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:10,512 INFO L85 PathProgramCache]: Analyzing trace with hash -1732718532, now seen corresponding path program 1 times [2021-11-23 17:05:10,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:10,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1922432678] [2021-11-23 17:05:10,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:10,512 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:10,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:10,513 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:10,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 17:05:10,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:10,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:05:10,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:10,771 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:10,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:05:10,771 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:10,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1922432678] [2021-11-23 17:05:10,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1922432678] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:05:10,771 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:05:10,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:05:10,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407555333] [2021-11-23 17:05:10,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:05:10,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:05:10,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:10,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:05:10,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:05:10,772 INFO L87 Difference]: Start difference. First operand 1077 states and 1478 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 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) [2021-11-23 17:05:10,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:10,819 INFO L93 Difference]: Finished difference Result 1561 states and 2152 transitions. [2021-11-23 17:05:10,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:05:10,820 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 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 96 [2021-11-23 17:05:10,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:10,821 INFO L225 Difference]: With dead ends: 1561 [2021-11-23 17:05:10,821 INFO L226 Difference]: Without dead ends: 599 [2021-11-23 17:05:10,822 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:05:10,822 INFO L933 BasicCegarLoop]: 144 mSDtfsCounter, 36 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:10,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 231 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:05:10,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2021-11-23 17:05:10,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 597. [2021-11-23 17:05:10,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 597 states, 596 states have (on average 1.3389261744966443) internal successors, (798), 596 states have internal predecessors, (798), 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) [2021-11-23 17:05:10,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 597 states to 597 states and 798 transitions. [2021-11-23 17:05:10,890 INFO L78 Accepts]: Start accepts. Automaton has 597 states and 798 transitions. Word has length 96 [2021-11-23 17:05:10,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:10,890 INFO L470 AbstractCegarLoop]: Abstraction has 597 states and 798 transitions. [2021-11-23 17:05:10,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 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) [2021-11-23 17:05:10,890 INFO L276 IsEmpty]: Start isEmpty. Operand 597 states and 798 transitions. [2021-11-23 17:05:10,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:05:10,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:10,891 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:10,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:11,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:05:11,095 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:11,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:11,096 INFO L85 PathProgramCache]: Analyzing trace with hash 686050797, now seen corresponding path program 1 times [2021-11-23 17:05:11,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:11,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [163116580] [2021-11-23 17:05:11,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:11,096 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:11,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:11,097 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:11,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:05:11,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:11,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:05:11,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:11,405 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:11,406 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:05:11,406 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:11,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [163116580] [2021-11-23 17:05:11,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [163116580] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:05:11,407 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:05:11,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:05:11,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121103582] [2021-11-23 17:05:11,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:05:11,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:05:11,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:11,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:05:11,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:05:11,409 INFO L87 Difference]: Start difference. First operand 597 states and 798 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 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) [2021-11-23 17:05:11,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:11,466 INFO L93 Difference]: Finished difference Result 841 states and 1133 transitions. [2021-11-23 17:05:11,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:05:11,467 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 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 97 [2021-11-23 17:05:11,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:11,468 INFO L225 Difference]: With dead ends: 841 [2021-11-23 17:05:11,468 INFO L226 Difference]: Without dead ends: 359 [2021-11-23 17:05:11,469 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:05:11,470 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 30 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:11,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 215 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:05:11,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2021-11-23 17:05:11,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 357. [2021-11-23 17:05:11,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 356 states have (on average 1.2921348314606742) internal successors, (460), 356 states have internal predecessors, (460), 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) [2021-11-23 17:05:11,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 460 transitions. [2021-11-23 17:05:11,512 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 460 transitions. Word has length 97 [2021-11-23 17:05:11,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:11,512 INFO L470 AbstractCegarLoop]: Abstraction has 357 states and 460 transitions. [2021-11-23 17:05:11,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 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) [2021-11-23 17:05:11,513 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 460 transitions. [2021-11-23 17:05:11,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:05:11,514 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:11,514 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:11,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:11,726 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:05:11,727 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:11,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:11,727 INFO L85 PathProgramCache]: Analyzing trace with hash 1521191634, now seen corresponding path program 1 times [2021-11-23 17:05:11,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:11,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [187428070] [2021-11-23 17:05:11,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:11,728 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:11,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:11,729 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:11,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 17:05:11,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:11,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:05:11,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:12,840 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:05:12,841 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:05:12,841 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:12,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [187428070] [2021-11-23 17:05:12,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [187428070] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:05:12,841 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:05:12,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:05:12,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587636790] [2021-11-23 17:05:12,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:05:12,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:05:12,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:12,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:05:12,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:12,842 INFO L87 Difference]: Start difference. First operand 357 states and 460 transitions. Second operand has 7 states, 7 states have (on average 13.714285714285714) internal successors, (96), 7 states have internal predecessors, (96), 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) [2021-11-23 17:05:13,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:13,072 INFO L93 Difference]: Finished difference Result 879 states and 1168 transitions. [2021-11-23 17:05:13,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:05:13,074 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.714285714285714) internal successors, (96), 7 states have internal predecessors, (96), 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 97 [2021-11-23 17:05:13,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:13,075 INFO L225 Difference]: With dead ends: 879 [2021-11-23 17:05:13,076 INFO L226 Difference]: Without dead ends: 797 [2021-11-23 17:05:13,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:13,077 INFO L933 BasicCegarLoop]: 252 mSDtfsCounter, 555 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 555 SdHoareTripleChecker+Valid, 782 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:13,077 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [555 Valid, 782 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:05:13,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 797 states. [2021-11-23 17:05:13,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 797 to 533. [2021-11-23 17:05:13,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 533 states, 532 states have (on average 1.300751879699248) internal successors, (692), 532 states have internal predecessors, (692), 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) [2021-11-23 17:05:13,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 533 states to 533 states and 692 transitions. [2021-11-23 17:05:13,121 INFO L78 Accepts]: Start accepts. Automaton has 533 states and 692 transitions. Word has length 97 [2021-11-23 17:05:13,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:13,121 INFO L470 AbstractCegarLoop]: Abstraction has 533 states and 692 transitions. [2021-11-23 17:05:13,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.714285714285714) internal successors, (96), 7 states have internal predecessors, (96), 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) [2021-11-23 17:05:13,121 INFO L276 IsEmpty]: Start isEmpty. Operand 533 states and 692 transitions. [2021-11-23 17:05:13,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:05:13,122 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:13,122 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:13,131 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-23 17:05:13,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:05:13,323 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:13,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:13,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1290516465, now seen corresponding path program 1 times [2021-11-23 17:05:13,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:13,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [964880752] [2021-11-23 17:05:13,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:13,324 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:13,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:13,325 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:13,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 17:05:13,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:13,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:05:13,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:14,612 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:05:14,612 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:05:14,613 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:14,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [964880752] [2021-11-23 17:05:14,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [964880752] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:05:14,613 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:05:14,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:05:14,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169618325] [2021-11-23 17:05:14,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:05:14,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:05:14,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:14,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:05:14,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:14,614 INFO L87 Difference]: Start difference. First operand 533 states and 692 transitions. Second operand has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 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) [2021-11-23 17:05:14,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:14,853 INFO L93 Difference]: Finished difference Result 975 states and 1294 transitions. [2021-11-23 17:05:14,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:05:14,854 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 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 97 [2021-11-23 17:05:14,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:14,856 INFO L225 Difference]: With dead ends: 975 [2021-11-23 17:05:14,856 INFO L226 Difference]: Without dead ends: 893 [2021-11-23 17:05:14,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:14,858 INFO L933 BasicCegarLoop]: 236 mSDtfsCounter, 550 mSDsluCounter, 533 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 550 SdHoareTripleChecker+Valid, 769 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:14,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [550 Valid, 769 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:05:14,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 893 states. [2021-11-23 17:05:14,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 893 to 629. [2021-11-23 17:05:14,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 629 states, 628 states have (on average 1.302547770700637) internal successors, (818), 628 states have internal predecessors, (818), 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) [2021-11-23 17:05:14,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 629 states to 629 states and 818 transitions. [2021-11-23 17:05:14,940 INFO L78 Accepts]: Start accepts. Automaton has 629 states and 818 transitions. Word has length 97 [2021-11-23 17:05:14,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:14,940 INFO L470 AbstractCegarLoop]: Abstraction has 629 states and 818 transitions. [2021-11-23 17:05:14,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 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) [2021-11-23 17:05:14,941 INFO L276 IsEmpty]: Start isEmpty. Operand 629 states and 818 transitions. [2021-11-23 17:05:14,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:05:14,942 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:14,942 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:14,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:15,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:05:15,155 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:15,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:15,156 INFO L85 PathProgramCache]: Analyzing trace with hash 1222451119, now seen corresponding path program 1 times [2021-11-23 17:05:15,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:15,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [984583111] [2021-11-23 17:05:15,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:15,157 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:15,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:15,158 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:15,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 17:05:15,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:15,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:05:15,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:16,663 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:05:16,663 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:05:16,663 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:16,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [984583111] [2021-11-23 17:05:16,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [984583111] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:05:16,664 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:05:16,664 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:05:16,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987698749] [2021-11-23 17:05:16,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:05:16,665 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:05:16,665 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:16,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:05:16,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:16,666 INFO L87 Difference]: Start difference. First operand 629 states and 818 transitions. Second operand has 7 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 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) [2021-11-23 17:05:16,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:16,870 INFO L93 Difference]: Finished difference Result 1065 states and 1412 transitions. [2021-11-23 17:05:16,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:05:16,870 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 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 97 [2021-11-23 17:05:16,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:16,872 INFO L225 Difference]: With dead ends: 1065 [2021-11-23 17:05:16,872 INFO L226 Difference]: Without dead ends: 983 [2021-11-23 17:05:16,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:16,873 INFO L933 BasicCegarLoop]: 219 mSDtfsCounter, 543 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 543 SdHoareTripleChecker+Valid, 722 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:16,873 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [543 Valid, 722 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:05:16,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 983 states. [2021-11-23 17:05:16,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 983 to 713. [2021-11-23 17:05:16,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 713 states, 712 states have (on average 1.303370786516854) internal successors, (928), 712 states have internal predecessors, (928), 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) [2021-11-23 17:05:16,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 713 states to 713 states and 928 transitions. [2021-11-23 17:05:16,940 INFO L78 Accepts]: Start accepts. Automaton has 713 states and 928 transitions. Word has length 97 [2021-11-23 17:05:16,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:16,940 INFO L470 AbstractCegarLoop]: Abstraction has 713 states and 928 transitions. [2021-11-23 17:05:16,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 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) [2021-11-23 17:05:16,940 INFO L276 IsEmpty]: Start isEmpty. Operand 713 states and 928 transitions. [2021-11-23 17:05:16,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:05:16,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:16,941 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:16,967 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Ended with exit code 0 [2021-11-23 17:05:17,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:05:17,155 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:17,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:17,156 INFO L85 PathProgramCache]: Analyzing trace with hash -56403054, now seen corresponding path program 1 times [2021-11-23 17:05:17,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:17,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [331707289] [2021-11-23 17:05:17,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:17,156 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:17,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:17,157 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:17,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 17:05:17,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:17,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:05:17,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:18,697 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:05:18,697 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:05:18,697 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:18,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [331707289] [2021-11-23 17:05:18,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [331707289] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:05:18,698 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:05:18,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:05:18,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67991139] [2021-11-23 17:05:18,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:05:18,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:05:18,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:18,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:05:18,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:18,700 INFO L87 Difference]: Start difference. First operand 713 states and 928 transitions. Second operand has 7 states, 7 states have (on average 13.142857142857142) internal successors, (92), 7 states have internal predecessors, (92), 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) [2021-11-23 17:05:18,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:18,940 INFO L93 Difference]: Finished difference Result 1145 states and 1518 transitions. [2021-11-23 17:05:18,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:05:18,941 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.142857142857142) internal successors, (92), 7 states have internal predecessors, (92), 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 97 [2021-11-23 17:05:18,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:18,942 INFO L225 Difference]: With dead ends: 1145 [2021-11-23 17:05:18,943 INFO L226 Difference]: Without dead ends: 903 [2021-11-23 17:05:18,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:18,944 INFO L933 BasicCegarLoop]: 238 mSDtfsCounter, 704 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 704 SdHoareTripleChecker+Valid, 784 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:18,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [704 Valid, 784 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:05:18,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 903 states. [2021-11-23 17:05:18,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 903 to 633. [2021-11-23 17:05:18,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 633 states, 632 states have (on average 1.2911392405063291) internal successors, (816), 632 states have internal predecessors, (816), 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) [2021-11-23 17:05:18,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 633 states to 633 states and 816 transitions. [2021-11-23 17:05:18,998 INFO L78 Accepts]: Start accepts. Automaton has 633 states and 816 transitions. Word has length 97 [2021-11-23 17:05:18,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:18,998 INFO L470 AbstractCegarLoop]: Abstraction has 633 states and 816 transitions. [2021-11-23 17:05:18,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.142857142857142) internal successors, (92), 7 states have internal predecessors, (92), 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) [2021-11-23 17:05:18,999 INFO L276 IsEmpty]: Start isEmpty. Operand 633 states and 816 transitions. [2021-11-23 17:05:19,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:05:19,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:19,000 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:19,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:19,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:05:19,201 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:19,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:19,201 INFO L85 PathProgramCache]: Analyzing trace with hash -89692366, now seen corresponding path program 1 times [2021-11-23 17:05:19,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:19,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1143768382] [2021-11-23 17:05:19,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:19,202 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:19,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:19,203 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:19,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 17:05:19,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:19,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:05:19,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:20,344 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:05:20,345 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:05:20,345 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:20,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1143768382] [2021-11-23 17:05:20,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1143768382] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:05:20,345 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:05:20,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:05:20,345 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315469517] [2021-11-23 17:05:20,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:05:20,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:05:20,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:20,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:05:20,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:20,347 INFO L87 Difference]: Start difference. First operand 633 states and 816 transitions. Second operand has 7 states, 7 states have (on average 13.428571428571429) internal successors, (94), 7 states have internal predecessors, (94), 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) [2021-11-23 17:05:20,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:20,578 INFO L93 Difference]: Finished difference Result 1069 states and 1410 transitions. [2021-11-23 17:05:20,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:05:20,578 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.428571428571429) internal successors, (94), 7 states have internal predecessors, (94), 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 97 [2021-11-23 17:05:20,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:20,580 INFO L225 Difference]: With dead ends: 1069 [2021-11-23 17:05:20,580 INFO L226 Difference]: Without dead ends: 987 [2021-11-23 17:05:20,581 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:20,582 INFO L933 BasicCegarLoop]: 263 mSDtfsCounter, 562 mSDsluCounter, 517 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 780 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:20,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [562 Valid, 780 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:05:20,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 987 states. [2021-11-23 17:05:20,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 987 to 723. [2021-11-23 17:05:20,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 723 states, 722 states have (on average 1.293628808864266) internal successors, (934), 722 states have internal predecessors, (934), 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) [2021-11-23 17:05:20,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 723 states to 723 states and 934 transitions. [2021-11-23 17:05:20,682 INFO L78 Accepts]: Start accepts. Automaton has 723 states and 934 transitions. Word has length 97 [2021-11-23 17:05:20,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:20,682 INFO L470 AbstractCegarLoop]: Abstraction has 723 states and 934 transitions. [2021-11-23 17:05:20,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.428571428571429) internal successors, (94), 7 states have internal predecessors, (94), 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) [2021-11-23 17:05:20,682 INFO L276 IsEmpty]: Start isEmpty. Operand 723 states and 934 transitions. [2021-11-23 17:05:20,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:05:20,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:20,683 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:20,692 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Ended with exit code 0 [2021-11-23 17:05:20,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:05:20,884 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:20,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:20,884 INFO L85 PathProgramCache]: Analyzing trace with hash -54516151, now seen corresponding path program 1 times [2021-11-23 17:05:20,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:20,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [197109078] [2021-11-23 17:05:20,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:20,885 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:20,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:20,886 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:20,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 17:05:21,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:21,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:05:21,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:23,139 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:23,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:23,936 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:23,936 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:23,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [197109078] [2021-11-23 17:05:23,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [197109078] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:23,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [960033765] [2021-11-23 17:05:23,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:23,939 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:05:23,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:05:23,951 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:05:23,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 17:05:24,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:24,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:05:24,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:29,633 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:29,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:33,840 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:33,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [960033765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:33,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721350475] [2021-11-23 17:05:33,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:33,841 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:05:33,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:05:33,841 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:05:33,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 17:05:33,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:33,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:05:33,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:40,304 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:40,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:41,702 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:41,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721350475] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:41,702 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:05:41,702 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 25, 24, 24, 24] total 90 [2021-11-23 17:05:41,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430452684] [2021-11-23 17:05:41,703 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:05:41,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2021-11-23 17:05:41,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:41,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-11-23 17:05:41,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=870, Invalid=7140, Unknown=0, NotChecked=0, Total=8010 [2021-11-23 17:05:41,709 INFO L87 Difference]: Start difference. First operand 723 states and 934 transitions. Second operand has 90 states, 90 states have (on average 4.1) internal successors, (369), 90 states have internal predecessors, (369), 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) [2021-11-23 17:05:46,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:46,090 INFO L93 Difference]: Finished difference Result 1469 states and 1892 transitions. [2021-11-23 17:05:46,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 17:05:46,095 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 4.1) internal successors, (369), 90 states have internal predecessors, (369), 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 98 [2021-11-23 17:05:46,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:46,097 INFO L225 Difference]: With dead ends: 1469 [2021-11-23 17:05:46,097 INFO L226 Difference]: Without dead ends: 1269 [2021-11-23 17:05:46,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4203 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=1303, Invalid=10469, Unknown=0, NotChecked=0, Total=11772 [2021-11-23 17:05:46,101 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 420 mSDsluCounter, 3213 mSDsCounter, 0 mSdLazyCounter, 936 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 420 SdHoareTripleChecker+Valid, 3342 SdHoareTripleChecker+Invalid, 1306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 343 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:46,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [420 Valid, 3342 Invalid, 1306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 936 Invalid, 0 Unknown, 343 Unchecked, 1.4s Time] [2021-11-23 17:05:46,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1269 states. [2021-11-23 17:05:46,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1269 to 695. [2021-11-23 17:05:46,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 695 states, 694 states have (on average 1.292507204610951) internal successors, (897), 694 states have internal predecessors, (897), 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) [2021-11-23 17:05:46,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 897 transitions. [2021-11-23 17:05:46,162 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 897 transitions. Word has length 98 [2021-11-23 17:05:46,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:46,162 INFO L470 AbstractCegarLoop]: Abstraction has 695 states and 897 transitions. [2021-11-23 17:05:46,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 90 states have (on average 4.1) internal successors, (369), 90 states have internal predecessors, (369), 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) [2021-11-23 17:05:46,162 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 897 transitions. [2021-11-23 17:05:46,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:05:46,163 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:46,163 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:46,171 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Ended with exit code 0 [2021-11-23 17:05:46,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:46,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:46,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:05:46,764 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:46,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:46,765 INFO L85 PathProgramCache]: Analyzing trace with hash 1194846284, now seen corresponding path program 1 times [2021-11-23 17:05:46,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:46,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1190766001] [2021-11-23 17:05:46,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:46,765 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:46,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:46,766 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:46,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:05:46,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:46,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:05:46,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:48,263 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:48,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:48,641 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:48,641 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:48,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1190766001] [2021-11-23 17:05:48,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1190766001] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:48,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2019660073] [2021-11-23 17:05:48,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:48,641 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:05:48,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:05:48,642 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:05:48,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:05:48,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:48,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:05:48,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:56,916 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:56,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:02,615 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:02,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2019660073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:02,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144572064] [2021-11-23 17:06:02,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:02,617 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:06:02,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:06:02,617 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:06:02,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:06:02,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:02,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:06:02,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:15,586 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:15,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:19,898 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:19,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144572064] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:19,899 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:06:19,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 32, 28, 32, 30] total 105 [2021-11-23 17:06:19,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292207031] [2021-11-23 17:06:19,899 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:06:19,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-23 17:06:19,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:19,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-23 17:06:19,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=991, Invalid=9929, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 17:06:19,905 INFO L87 Difference]: Start difference. First operand 695 states and 897 transitions. Second operand has 105 states, 105 states have (on average 4.152380952380953) internal successors, (436), 105 states have internal predecessors, (436), 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) [2021-11-23 17:06:25,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:25,333 INFO L93 Difference]: Finished difference Result 936 states and 1203 transitions. [2021-11-23 17:06:25,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 17:06:25,334 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 4.152380952380953) internal successors, (436), 105 states have internal predecessors, (436), 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 98 [2021-11-23 17:06:25,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:25,335 INFO L225 Difference]: With dead ends: 936 [2021-11-23 17:06:25,335 INFO L226 Difference]: Without dead ends: 748 [2021-11-23 17:06:25,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4791 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=1478, Invalid=13774, Unknown=0, NotChecked=0, Total=15252 [2021-11-23 17:06:25,340 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 263 mSDsluCounter, 2392 mSDsCounter, 0 mSdLazyCounter, 658 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 2477 SdHoareTripleChecker+Invalid, 1027 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 341 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:25,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 2477 Invalid, 1027 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 658 Invalid, 0 Unknown, 341 Unchecked, 0.9s Time] [2021-11-23 17:06:25,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 748 states. [2021-11-23 17:06:25,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 748 to 701. [2021-11-23 17:06:25,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 701 states, 700 states have (on average 1.2914285714285714) internal successors, (904), 700 states have internal predecessors, (904), 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) [2021-11-23 17:06:25,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 701 states to 701 states and 904 transitions. [2021-11-23 17:06:25,400 INFO L78 Accepts]: Start accepts. Automaton has 701 states and 904 transitions. Word has length 98 [2021-11-23 17:06:25,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:25,400 INFO L470 AbstractCegarLoop]: Abstraction has 701 states and 904 transitions. [2021-11-23 17:06:25,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 4.152380952380953) internal successors, (436), 105 states have internal predecessors, (436), 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) [2021-11-23 17:06:25,400 INFO L276 IsEmpty]: Start isEmpty. Operand 701 states and 904 transitions. [2021-11-23 17:06:25,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:06:25,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:25,401 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:06:25,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:25,622 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2021-11-23 17:06:25,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:26,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:26,003 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:26,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:26,004 INFO L85 PathProgramCache]: Analyzing trace with hash 508575887, now seen corresponding path program 1 times [2021-11-23 17:06:26,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:26,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [340775005] [2021-11-23 17:06:26,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:26,004 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:26,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:26,005 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:26,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:06:26,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:26,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:06:26,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:35,959 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:35,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:41,322 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:41,323 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:41,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [340775005] [2021-11-23 17:06:41,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [340775005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:41,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [647477862] [2021-11-23 17:06:41,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:41,323 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:41,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:06:41,325 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:06:41,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 17:06:41,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:41,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:06:41,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:43,949 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:43,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:44,880 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:44,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [647477862] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:44,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060593349] [2021-11-23 17:06:44,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:44,881 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:06:44,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:06:44,881 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:06:44,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 17:06:44,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:44,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:06:44,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:50,845 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:50,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:52,745 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:06:52,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060593349] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:52,745 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:06:52,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 28, 11, 9, 33, 28] total 75 [2021-11-23 17:06:52,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30724293] [2021-11-23 17:06:52,746 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:06:52,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-23 17:06:52,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:52,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-23 17:06:52,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=673, Invalid=4877, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:06:52,749 INFO L87 Difference]: Start difference. First operand 701 states and 904 transitions. Second operand has 75 states, 75 states have (on average 4.466666666666667) internal successors, (335), 75 states have internal predecessors, (335), 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) [2021-11-23 17:06:55,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:55,102 INFO L93 Difference]: Finished difference Result 1150 states and 1464 transitions. [2021-11-23 17:06:55,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 17:06:55,103 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 4.466666666666667) internal successors, (335), 75 states have internal predecessors, (335), 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 98 [2021-11-23 17:06:55,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:55,104 INFO L225 Difference]: With dead ends: 1150 [2021-11-23 17:06:55,104 INFO L226 Difference]: Without dead ends: 984 [2021-11-23 17:06:55,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 511 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2234 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=791, Invalid=5371, Unknown=0, NotChecked=0, Total=6162 [2021-11-23 17:06:55,107 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 300 mSDsluCounter, 2294 mSDsCounter, 0 mSdLazyCounter, 788 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 2404 SdHoareTripleChecker+Invalid, 1027 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 788 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 223 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:55,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 2404 Invalid, 1027 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 788 Invalid, 0 Unknown, 223 Unchecked, 1.1s Time] [2021-11-23 17:06:55,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 984 states. [2021-11-23 17:06:55,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 984 to 712. [2021-11-23 17:06:55,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 712 states, 711 states have (on average 1.289732770745429) internal successors, (917), 711 states have internal predecessors, (917), 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) [2021-11-23 17:06:55,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 712 states to 712 states and 917 transitions. [2021-11-23 17:06:55,185 INFO L78 Accepts]: Start accepts. Automaton has 712 states and 917 transitions. Word has length 98 [2021-11-23 17:06:55,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:55,185 INFO L470 AbstractCegarLoop]: Abstraction has 712 states and 917 transitions. [2021-11-23 17:06:55,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 4.466666666666667) internal successors, (335), 75 states have internal predecessors, (335), 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) [2021-11-23 17:06:55,186 INFO L276 IsEmpty]: Start isEmpty. Operand 712 states and 917 transitions. [2021-11-23 17:06:55,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:06:55,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:55,187 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:06:55,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:55,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:55,606 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Ended with exit code 0 [2021-11-23 17:06:55,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:06:55,799 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:55,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:55,800 INFO L85 PathProgramCache]: Analyzing trace with hash -234312311, now seen corresponding path program 1 times [2021-11-23 17:06:55,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:55,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1101181050] [2021-11-23 17:06:55,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:55,800 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:55,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:55,801 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:55,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 17:06:55,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:55,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:06:55,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:04,713 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:04,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:10,793 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:10,794 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:10,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1101181050] [2021-11-23 17:07:10,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1101181050] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:10,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1617945972] [2021-11-23 17:07:10,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:10,794 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:10,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:07:10,795 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:07:10,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 17:07:10,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:10,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:07:10,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:20,483 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:20,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:24,328 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:24,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1617945972] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:24,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348004333] [2021-11-23 17:07:24,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:24,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:07:24,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:07:24,329 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:07:24,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 17:07:24,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:24,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 17:07:24,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:30,382 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:30,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:33,128 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:33,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348004333] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:33,128 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:07:33,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32, 30, 33, 32] total 88 [2021-11-23 17:07:33,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561231506] [2021-11-23 17:07:33,128 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:07:33,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-23 17:07:33,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:33,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-23 17:07:33,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=960, Invalid=6696, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 17:07:33,132 INFO L87 Difference]: Start difference. First operand 712 states and 917 transitions. Second operand has 88 states, 88 states have (on average 2.9318181818181817) internal successors, (258), 88 states have internal predecessors, (258), 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) [2021-11-23 17:07:34,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:34,762 INFO L93 Difference]: Finished difference Result 939 states and 1204 transitions. [2021-11-23 17:07:34,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 17:07:34,763 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 2.9318181818181817) internal successors, (258), 88 states have internal predecessors, (258), 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 98 [2021-11-23 17:07:34,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:34,764 INFO L225 Difference]: With dead ends: 939 [2021-11-23 17:07:34,764 INFO L226 Difference]: Without dead ends: 763 [2021-11-23 17:07:34,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 587 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3333 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=1102, Invalid=7270, Unknown=0, NotChecked=0, Total=8372 [2021-11-23 17:07:34,766 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 258 mSDsluCounter, 2058 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 2140 SdHoareTripleChecker+Invalid, 1038 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 412 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:34,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [258 Valid, 2140 Invalid, 1038 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 609 Invalid, 0 Unknown, 412 Unchecked, 0.8s Time] [2021-11-23 17:07:34,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 763 states. [2021-11-23 17:07:34,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 763 to 713. [2021-11-23 17:07:34,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 713 states, 712 states have (on average 1.2893258426966292) internal successors, (918), 712 states have internal predecessors, (918), 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) [2021-11-23 17:07:34,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 713 states to 713 states and 918 transitions. [2021-11-23 17:07:34,842 INFO L78 Accepts]: Start accepts. Automaton has 713 states and 918 transitions. Word has length 98 [2021-11-23 17:07:34,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:34,842 INFO L470 AbstractCegarLoop]: Abstraction has 713 states and 918 transitions. [2021-11-23 17:07:34,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 2.9318181818181817) internal successors, (258), 88 states have internal predecessors, (258), 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) [2021-11-23 17:07:34,842 INFO L276 IsEmpty]: Start isEmpty. Operand 713 states and 918 transitions. [2021-11-23 17:07:34,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:07:34,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:34,843 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:07:34,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:35,064 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-23 17:07:35,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:35,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:35,444 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:35,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:35,445 INFO L85 PathProgramCache]: Analyzing trace with hash -2052613548, now seen corresponding path program 1 times [2021-11-23 17:07:35,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:35,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [862048767] [2021-11-23 17:07:35,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:35,445 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:35,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:35,446 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:35,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:07:35,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:35,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:07:35,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:36,893 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:36,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:37,250 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:37,250 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:37,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [862048767] [2021-11-23 17:07:37,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [862048767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:37,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1855601496] [2021-11-23 17:07:37,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:37,251 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:37,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:07:37,255 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:07:37,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:07:37,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:37,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:07:37,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:39,204 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:39,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:39,734 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:39,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1855601496] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:39,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110231298] [2021-11-23 17:07:39,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:39,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:07:39,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:07:39,738 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:07:39,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:07:39,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:39,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:07:39,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:42,649 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:42,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:45,048 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:45,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110231298] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:45,049 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:07:45,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 15, 16] total 57 [2021-11-23 17:07:45,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719704668] [2021-11-23 17:07:45,050 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:07:45,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-23 17:07:45,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:45,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-23 17:07:45,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=2942, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:07:45,052 INFO L87 Difference]: Start difference. First operand 713 states and 918 transitions. Second operand has 57 states, 57 states have (on average 8.491228070175438) internal successors, (484), 57 states have internal predecessors, (484), 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) [2021-11-23 17:07:46,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:46,323 INFO L93 Difference]: Finished difference Result 893 states and 1155 transitions. [2021-11-23 17:07:46,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 17:07:46,329 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 8.491228070175438) internal successors, (484), 57 states have internal predecessors, (484), 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 [2021-11-23 17:07:46,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:46,329 INFO L225 Difference]: With dead ends: 893 [2021-11-23 17:07:46,330 INFO L226 Difference]: Without dead ends: 705 [2021-11-23 17:07:46,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 611 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1238 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=497, Invalid=4759, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 17:07:46,331 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 146 mSDsluCounter, 2071 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 2166 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 238 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:46,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 2166 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 97 Invalid, 0 Unknown, 238 Unchecked, 0.1s Time] [2021-11-23 17:07:46,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 705 states. [2021-11-23 17:07:46,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 705 to 690. [2021-11-23 17:07:46,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 690 states, 689 states have (on average 1.2888243831640058) internal successors, (888), 689 states have internal predecessors, (888), 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) [2021-11-23 17:07:46,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 690 states to 690 states and 888 transitions. [2021-11-23 17:07:46,392 INFO L78 Accepts]: Start accepts. Automaton has 690 states and 888 transitions. Word has length 99 [2021-11-23 17:07:46,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:46,393 INFO L470 AbstractCegarLoop]: Abstraction has 690 states and 888 transitions. [2021-11-23 17:07:46,393 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 8.491228070175438) internal successors, (484), 57 states have internal predecessors, (484), 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) [2021-11-23 17:07:46,393 INFO L276 IsEmpty]: Start isEmpty. Operand 690 states and 888 transitions. [2021-11-23 17:07:46,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:07:46,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:46,394 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:07:46,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:46,614 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-23 17:07:46,795 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Ended with exit code 0 [2021-11-23 17:07:46,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:46,994 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:46,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:46,995 INFO L85 PathProgramCache]: Analyzing trace with hash 1556083351, now seen corresponding path program 1 times [2021-11-23 17:07:46,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:46,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1222740691] [2021-11-23 17:07:46,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:46,995 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:46,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:46,996 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:46,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:07:47,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:47,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:07:47,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:50,162 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:50,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:51,269 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:07:51,269 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:51,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1222740691] [2021-11-23 17:07:51,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1222740691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:51,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [426840345] [2021-11-23 17:07:51,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:51,270 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:51,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:07:51,271 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:07:51,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:07:51,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:51,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:07:51,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:02,308 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:02,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:06,083 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:06,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [426840345] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:06,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107617509] [2021-11-23 17:08:06,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:06,084 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:06,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:06,085 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:06,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 17:08:06,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:06,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:08:06,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:09,354 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:09,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:10,242 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:10,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107617509] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:10,242 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:10,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 31, 26, 16, 15] total 78 [2021-11-23 17:08:10,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113922259] [2021-11-23 17:08:10,243 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:10,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-23 17:08:10,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:10,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-23 17:08:10,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=853, Invalid=5153, Unknown=0, NotChecked=0, Total=6006 [2021-11-23 17:08:10,246 INFO L87 Difference]: Start difference. First operand 690 states and 888 transitions. Second operand has 78 states, 78 states have (on average 4.217948717948718) internal successors, (329), 78 states have internal predecessors, (329), 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) [2021-11-23 17:08:11,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:11,454 INFO L93 Difference]: Finished difference Result 1167 states and 1476 transitions. [2021-11-23 17:08:11,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 17:08:11,455 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 4.217948717948718) internal successors, (329), 78 states have internal predecessors, (329), 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 [2021-11-23 17:08:11,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:11,456 INFO L225 Difference]: With dead ends: 1167 [2021-11-23 17:08:11,456 INFO L226 Difference]: Without dead ends: 1001 [2021-11-23 17:08:11,457 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 512 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2325 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=897, Invalid=5583, Unknown=0, NotChecked=0, Total=6480 [2021-11-23 17:08:11,457 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 273 mSDsluCounter, 3001 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 3133 SdHoareTripleChecker+Invalid, 868 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 385 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:11,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 3133 Invalid, 868 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 465 Invalid, 0 Unknown, 385 Unchecked, 0.6s Time] [2021-11-23 17:08:11,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1001 states. [2021-11-23 17:08:11,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1001 to 696. [2021-11-23 17:08:11,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 696 states, 695 states have (on average 1.2877697841726619) internal successors, (895), 695 states have internal predecessors, (895), 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) [2021-11-23 17:08:11,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 696 states to 696 states and 895 transitions. [2021-11-23 17:08:11,525 INFO L78 Accepts]: Start accepts. Automaton has 696 states and 895 transitions. Word has length 99 [2021-11-23 17:08:11,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:11,525 INFO L470 AbstractCegarLoop]: Abstraction has 696 states and 895 transitions. [2021-11-23 17:08:11,525 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 4.217948717948718) internal successors, (329), 78 states have internal predecessors, (329), 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) [2021-11-23 17:08:11,525 INFO L276 IsEmpty]: Start isEmpty. Operand 696 states and 895 transitions. [2021-11-23 17:08:11,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:08:11,526 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:11,526 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:11,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:11,734 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Ended with exit code 0 [2021-11-23 17:08:11,951 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-23 17:08:12,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:12,136 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:12,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:12,136 INFO L85 PathProgramCache]: Analyzing trace with hash 813195153, now seen corresponding path program 1 times [2021-11-23 17:08:12,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:12,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1627921932] [2021-11-23 17:08:12,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:12,137 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:12,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:12,138 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:12,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:08:12,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:12,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:08:12,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:13,716 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:13,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:14,165 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:14,165 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:14,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1627921932] [2021-11-23 17:08:14,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1627921932] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:14,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1963350198] [2021-11-23 17:08:14,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:14,166 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:14,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:14,166 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:14,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 17:08:14,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:14,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:08:14,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:18,071 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:18,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:19,322 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:19,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1963350198] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:19,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088453184] [2021-11-23 17:08:19,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:19,323 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:19,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:19,324 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:19,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 17:08:19,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:19,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:08:19,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:26,006 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:26,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:30,530 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:30,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1088453184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:30,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:30,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 19, 14, 22, 23] total 79 [2021-11-23 17:08:30,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331386323] [2021-11-23 17:08:30,532 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:30,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-23 17:08:30,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:30,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-23 17:08:30,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=688, Invalid=5474, Unknown=0, NotChecked=0, Total=6162 [2021-11-23 17:08:30,535 INFO L87 Difference]: Start difference. First operand 696 states and 895 transitions. Second operand has 79 states, 79 states have (on average 5.987341772151899) internal successors, (473), 79 states have internal predecessors, (473), 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) [2021-11-23 17:08:32,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:32,088 INFO L93 Difference]: Finished difference Result 1564 states and 1980 transitions. [2021-11-23 17:08:32,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 17:08:32,088 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 5.987341772151899) internal successors, (473), 79 states have internal predecessors, (473), 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 [2021-11-23 17:08:32,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:32,091 INFO L225 Difference]: With dead ends: 1564 [2021-11-23 17:08:32,091 INFO L226 Difference]: Without dead ends: 1388 [2021-11-23 17:08:32,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 511 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2208 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=757, Invalid=6049, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 17:08:32,094 INFO L933 BasicCegarLoop]: 187 mSDtfsCounter, 293 mSDsluCounter, 4365 mSDsCounter, 0 mSdLazyCounter, 701 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 4552 SdHoareTripleChecker+Invalid, 1029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 314 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:32,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 4552 Invalid, 1029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 701 Invalid, 0 Unknown, 314 Unchecked, 0.8s Time] [2021-11-23 17:08:32,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1388 states. [2021-11-23 17:08:32,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1388 to 676. [2021-11-23 17:08:32,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 676 states, 675 states have (on average 1.2903703703703704) internal successors, (871), 675 states have internal predecessors, (871), 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) [2021-11-23 17:08:32,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 676 states to 676 states and 871 transitions. [2021-11-23 17:08:32,190 INFO L78 Accepts]: Start accepts. Automaton has 676 states and 871 transitions. Word has length 99 [2021-11-23 17:08:32,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:32,191 INFO L470 AbstractCegarLoop]: Abstraction has 676 states and 871 transitions. [2021-11-23 17:08:32,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 5.987341772151899) internal successors, (473), 79 states have internal predecessors, (473), 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) [2021-11-23 17:08:32,191 INFO L276 IsEmpty]: Start isEmpty. Operand 676 states and 871 transitions. [2021-11-23 17:08:32,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:08:32,191 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:32,192 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:32,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:32,401 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Ended with exit code 0 [2021-11-23 17:08:32,596 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Ended with exit code 0 [2021-11-23 17:08:32,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:32,795 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:32,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:32,795 INFO L85 PathProgramCache]: Analyzing trace with hash -481187504, now seen corresponding path program 1 times [2021-11-23 17:08:32,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:32,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1428841445] [2021-11-23 17:08:32,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:32,796 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:32,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:32,797 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:32,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 17:08:32,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:32,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:08:32,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:36,336 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:36,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:37,542 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:37,542 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:37,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1428841445] [2021-11-23 17:08:37,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1428841445] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:37,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [522060962] [2021-11-23 17:08:37,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:37,543 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:37,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:37,544 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:37,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 17:08:37,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:37,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:08:37,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:40,676 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:40,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:41,381 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:41,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [522060962] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:41,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1574866649] [2021-11-23 17:08:41,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:41,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:41,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:41,382 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:41,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 17:08:41,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:41,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:08:41,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:48,170 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:48,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:51,584 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:08:51,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1574866649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:51,584 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:51,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 23, 21] total 66 [2021-11-23 17:08:51,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202497052] [2021-11-23 17:08:51,585 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:51,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-23 17:08:51,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:51,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-23 17:08:51,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=618, Invalid=3672, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 17:08:51,588 INFO L87 Difference]: Start difference. First operand 676 states and 871 transitions. Second operand has 66 states, 66 states have (on average 5.015151515151516) internal successors, (331), 66 states have internal predecessors, (331), 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) [2021-11-23 17:08:52,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:52,129 INFO L93 Difference]: Finished difference Result 1113 states and 1420 transitions. [2021-11-23 17:08:52,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:08:52,130 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 5.015151515151516) internal successors, (331), 66 states have internal predecessors, (331), 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 [2021-11-23 17:08:52,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:52,131 INFO L225 Difference]: With dead ends: 1113 [2021-11-23 17:08:52,131 INFO L226 Difference]: Without dead ends: 947 [2021-11-23 17:08:52,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 590 GetRequests, 524 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1574 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=666, Invalid=3890, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:08:52,132 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 357 mSDsluCounter, 1905 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 2029 SdHoareTripleChecker+Invalid, 679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 521 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:52,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [357 Valid, 2029 Invalid, 679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 148 Invalid, 0 Unknown, 521 Unchecked, 0.1s Time] [2021-11-23 17:08:52,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 947 states. [2021-11-23 17:08:52,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 947 to 665. [2021-11-23 17:08:52,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 665 states, 664 states have (on average 1.2921686746987953) internal successors, (858), 664 states have internal predecessors, (858), 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) [2021-11-23 17:08:52,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 665 states to 665 states and 858 transitions. [2021-11-23 17:08:52,209 INFO L78 Accepts]: Start accepts. Automaton has 665 states and 858 transitions. Word has length 99 [2021-11-23 17:08:52,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:52,210 INFO L470 AbstractCegarLoop]: Abstraction has 665 states and 858 transitions. [2021-11-23 17:08:52,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 5.015151515151516) internal successors, (331), 66 states have internal predecessors, (331), 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) [2021-11-23 17:08:52,210 INFO L276 IsEmpty]: Start isEmpty. Operand 665 states and 858 transitions. [2021-11-23 17:08:52,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:08:52,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:52,211 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:52,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:52,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:52,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:52,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:08:52,812 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:52,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:52,813 INFO L85 PathProgramCache]: Analyzing trace with hash 733595594, now seen corresponding path program 1 times [2021-11-23 17:08:52,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:52,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [197576273] [2021-11-23 17:08:52,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:52,813 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:52,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:52,814 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:52,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 17:08:52,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:52,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:08:52,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:53,253 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:08:53,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:53,480 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:08:53,480 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:08:53,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [197576273] [2021-11-23 17:08:53,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [197576273] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:53,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [128013656] [2021-11-23 17:08:53,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:53,481 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:08:53,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:08:53,483 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:08:53,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 17:08:53,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:53,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:08:53,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:54,008 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:08:54,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:54,236 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:08:54,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [128013656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:54,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172271414] [2021-11-23 17:08:54,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:54,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:54,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:54,239 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:54,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 17:08:54,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:54,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:08:54,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:54,680 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:08:54,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:54,920 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:08:54,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172271414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:54,920 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:08:54,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 17:08:54,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518329593] [2021-11-23 17:08:54,921 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:08:54,921 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:08:54,921 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:54,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:08:54,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:08:54,922 INFO L87 Difference]: Start difference. First operand 665 states and 858 transitions. Second operand has 6 states, 6 states have (on average 32.166666666666664) internal successors, (193), 6 states have internal predecessors, (193), 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) [2021-11-23 17:08:55,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:55,146 INFO L93 Difference]: Finished difference Result 2036 states and 2634 transitions. [2021-11-23 17:08:55,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:08:55,147 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 32.166666666666664) internal successors, (193), 6 states have internal predecessors, (193), 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 [2021-11-23 17:08:55,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:55,149 INFO L225 Difference]: With dead ends: 2036 [2021-11-23 17:08:55,149 INFO L226 Difference]: Without dead ends: 1474 [2021-11-23 17:08:55,150 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 589 GetRequests, 581 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:08:55,151 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 266 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:55,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [266 Valid, 561 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 19 Invalid, 0 Unknown, 11 Unchecked, 0.0s Time] [2021-11-23 17:08:55,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1474 states. [2021-11-23 17:08:55,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1474 to 1418. [2021-11-23 17:08:55,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1418 states, 1417 states have (on average 1.2724064925899787) internal successors, (1803), 1417 states have internal predecessors, (1803), 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) [2021-11-23 17:08:55,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1418 states to 1418 states and 1803 transitions. [2021-11-23 17:08:55,352 INFO L78 Accepts]: Start accepts. Automaton has 1418 states and 1803 transitions. Word has length 99 [2021-11-23 17:08:55,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:55,352 INFO L470 AbstractCegarLoop]: Abstraction has 1418 states and 1803 transitions. [2021-11-23 17:08:55,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 32.166666666666664) internal successors, (193), 6 states have internal predecessors, (193), 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) [2021-11-23 17:08:55,353 INFO L276 IsEmpty]: Start isEmpty. Operand 1418 states and 1803 transitions. [2021-11-23 17:08:55,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:08:55,353 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:55,353 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:55,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:55,562 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Ended with exit code 0 [2021-11-23 17:08:55,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:55,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:55,954 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:55,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:55,955 INFO L85 PathProgramCache]: Analyzing trace with hash 730421677, now seen corresponding path program 1 times [2021-11-23 17:08:55,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:55,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1409306003] [2021-11-23 17:08:55,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:55,956 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:55,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:55,957 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:55,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 17:08:56,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:56,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:08:56,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:29,171 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:29,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:52,697 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:09:52,697 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:52,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1409306003] [2021-11-23 17:09:52,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1409306003] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:52,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [806533889] [2021-11-23 17:09:52,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:52,698 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:52,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:52,699 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:52,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 17:09:52,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:52,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:09:52,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:22,076 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:22,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:10:27,227 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:27,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [806533889] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:10:27,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143921478] [2021-11-23 17:10:27,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:10:27,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:10:27,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:10:27,229 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:10:27,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 17:10:27,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:10:27,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:10:27,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:10:58,220 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:10:58,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:01,885 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:01,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143921478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:01,886 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:01,886 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 30, 35, 28, 33, 26] total 109 [2021-11-23 17:11:01,886 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964492404] [2021-11-23 17:11:01,886 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:01,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-23 17:11:01,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:01,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-23 17:11:01,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1256, Invalid=10516, Unknown=0, NotChecked=0, Total=11772 [2021-11-23 17:11:01,888 INFO L87 Difference]: Start difference. First operand 1418 states and 1803 transitions. Second operand has 109 states, 109 states have (on average 3.0) internal successors, (327), 109 states have internal predecessors, (327), 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) [2021-11-23 17:11:04,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:04,494 INFO L93 Difference]: Finished difference Result 1792 states and 2288 transitions. [2021-11-23 17:11:04,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 17:11:04,495 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 3.0) internal successors, (327), 109 states have internal predecessors, (327), 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 [2021-11-23 17:11:04,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:04,497 INFO L225 Difference]: With dead ends: 1792 [2021-11-23 17:11:04,497 INFO L226 Difference]: Without dead ends: 1448 [2021-11-23 17:11:04,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 590 GetRequests, 480 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5406 ImplicationChecksByTransitivity, 99.5s TimeCoverageRelationStatistics Valid=1326, Invalid=10884, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 17:11:04,499 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 300 mSDsluCounter, 1918 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 1995 SdHoareTripleChecker+Invalid, 794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 261 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:04,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 1995 Invalid, 794 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 520 Invalid, 0 Unknown, 261 Unchecked, 0.9s Time] [2021-11-23 17:11:04,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1448 states. [2021-11-23 17:11:04,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1448 to 1439. [2021-11-23 17:11:04,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1439 states, 1438 states have (on average 1.2712100139082059) internal successors, (1828), 1438 states have internal predecessors, (1828), 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) [2021-11-23 17:11:04,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1439 states to 1439 states and 1828 transitions. [2021-11-23 17:11:04,686 INFO L78 Accepts]: Start accepts. Automaton has 1439 states and 1828 transitions. Word has length 99 [2021-11-23 17:11:04,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:04,687 INFO L470 AbstractCegarLoop]: Abstraction has 1439 states and 1828 transitions. [2021-11-23 17:11:04,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 3.0) internal successors, (327), 109 states have internal predecessors, (327), 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) [2021-11-23 17:11:04,687 INFO L276 IsEmpty]: Start isEmpty. Operand 1439 states and 1828 transitions. [2021-11-23 17:11:04,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:11:04,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:04,689 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:04,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:04,912 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Ended with exit code 0 [2021-11-23 17:11:05,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:05,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:11:05,291 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:05,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:05,292 INFO L85 PathProgramCache]: Analyzing trace with hash 904606071, now seen corresponding path program 1 times [2021-11-23 17:11:05,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:05,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1410409688] [2021-11-23 17:11:05,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:05,292 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:05,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:05,293 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:05,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 17:11:05,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:05,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:11:05,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:08,671 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:08,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:09,914 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:09,914 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:09,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1410409688] [2021-11-23 17:11:09,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1410409688] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:09,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [14070773] [2021-11-23 17:11:09,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:09,915 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:09,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:09,916 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:09,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Waiting until timeout for monitored process [2021-11-23 17:11:10,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:10,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:11:10,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:13,662 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:13,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:14,241 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:14,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [14070773] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:14,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1271040085] [2021-11-23 17:11:14,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:14,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:14,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:14,243 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:14,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-23 17:11:14,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:14,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:11:14,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:18,397 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:18,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:19,866 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:19,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1271040085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:19,866 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:19,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 16, 14] total 54 [2021-11-23 17:11:19,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597700748] [2021-11-23 17:11:19,867 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:19,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-23 17:11:19,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:19,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-23 17:11:19,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=2558, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 17:11:19,868 INFO L87 Difference]: Start difference. First operand 1439 states and 1828 transitions. Second operand has 54 states, 54 states have (on average 6.351851851851852) internal successors, (343), 54 states have internal predecessors, (343), 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) [2021-11-23 17:11:22,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:22,348 INFO L93 Difference]: Finished difference Result 2454 states and 3087 transitions. [2021-11-23 17:11:22,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:11:22,349 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 6.351851851851852) internal successors, (343), 54 states have internal predecessors, (343), 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 [2021-11-23 17:11:22,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:22,350 INFO L225 Difference]: With dead ends: 2454 [2021-11-23 17:11:22,351 INFO L226 Difference]: Without dead ends: 1976 [2021-11-23 17:11:22,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 616 GetRequests, 543 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=636, Invalid=4914, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:11:22,352 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 344 mSDsluCounter, 3036 mSDsCounter, 0 mSdLazyCounter, 487 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 344 SdHoareTripleChecker+Valid, 3169 SdHoareTripleChecker+Invalid, 768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 262 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:22,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [344 Valid, 3169 Invalid, 768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 487 Invalid, 0 Unknown, 262 Unchecked, 0.4s Time] [2021-11-23 17:11:22,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1976 states. [2021-11-23 17:11:22,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1976 to 1446. [2021-11-23 17:11:22,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1446 states, 1445 states have (on average 1.2705882352941176) internal successors, (1836), 1445 states have internal predecessors, (1836), 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) [2021-11-23 17:11:22,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1446 states to 1446 states and 1836 transitions. [2021-11-23 17:11:22,516 INFO L78 Accepts]: Start accepts. Automaton has 1446 states and 1836 transitions. Word has length 99 [2021-11-23 17:11:22,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:22,516 INFO L470 AbstractCegarLoop]: Abstraction has 1446 states and 1836 transitions. [2021-11-23 17:11:22,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 6.351851851851852) internal successors, (343), 54 states have internal predecessors, (343), 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) [2021-11-23 17:11:22,516 INFO L276 IsEmpty]: Start isEmpty. Operand 1446 states and 1836 transitions. [2021-11-23 17:11:22,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:11:22,517 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:22,517 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:22,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:22,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:22,940 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2021-11-23 17:11:23,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:23,119 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:23,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:23,119 INFO L85 PathProgramCache]: Analyzing trace with hash -1156585307, now seen corresponding path program 1 times [2021-11-23 17:11:23,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:23,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1677575286] [2021-11-23 17:11:23,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:23,120 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:23,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:23,121 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:23,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2021-11-23 17:11:23,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:23,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:11:23,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:24,705 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:24,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:25,074 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:25,074 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:25,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1677575286] [2021-11-23 17:11:25,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1677575286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:25,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2031316274] [2021-11-23 17:11:25,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:25,075 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:25,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:25,076 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:25,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Waiting until timeout for monitored process [2021-11-23 17:11:25,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:25,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:11:25,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:26,927 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:26,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:27,213 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:27,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2031316274] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:27,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331414476] [2021-11-23 17:11:27,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:27,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:27,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:27,215 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:27,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-23 17:11:27,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:27,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:11:27,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:28,925 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:28,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:29,163 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:29,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331414476] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:29,163 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:29,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 11, 9] total 18 [2021-11-23 17:11:29,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963933261] [2021-11-23 17:11:29,164 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:29,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:11:29,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:29,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:11:29,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:11:29,165 INFO L87 Difference]: Start difference. First operand 1446 states and 1836 transitions. Second operand has 18 states, 18 states have (on average 9.944444444444445) internal successors, (179), 18 states have internal predecessors, (179), 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) [2021-11-23 17:11:29,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:29,378 INFO L93 Difference]: Finished difference Result 1714 states and 2186 transitions. [2021-11-23 17:11:29,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:11:29,379 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 9.944444444444445) internal successors, (179), 18 states have internal predecessors, (179), 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 100 [2021-11-23 17:11:29,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:29,380 INFO L225 Difference]: With dead ends: 1714 [2021-11-23 17:11:29,380 INFO L226 Difference]: Without dead ends: 1242 [2021-11-23 17:11:29,381 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 595 GetRequests, 578 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:11:29,382 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 70 mSDsluCounter, 784 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 25 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:29,382 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 895 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 83 Invalid, 0 Unknown, 25 Unchecked, 0.1s Time] [2021-11-23 17:11:29,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1242 states. [2021-11-23 17:11:29,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1242 to 1226. [2021-11-23 17:11:29,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1226 states, 1225 states have (on average 1.2685714285714285) internal successors, (1554), 1225 states have internal predecessors, (1554), 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) [2021-11-23 17:11:29,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1226 states to 1226 states and 1554 transitions. [2021-11-23 17:11:29,516 INFO L78 Accepts]: Start accepts. Automaton has 1226 states and 1554 transitions. Word has length 100 [2021-11-23 17:11:29,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:29,516 INFO L470 AbstractCegarLoop]: Abstraction has 1226 states and 1554 transitions. [2021-11-23 17:11:29,517 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 9.944444444444445) internal successors, (179), 18 states have internal predecessors, (179), 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) [2021-11-23 17:11:29,517 INFO L276 IsEmpty]: Start isEmpty. Operand 1226 states and 1554 transitions. [2021-11-23 17:11:29,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:11:29,517 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:29,518 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:29,528 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:29,740 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2021-11-23 17:11:29,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:30,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:30,119 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:30,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:30,119 INFO L85 PathProgramCache]: Analyzing trace with hash -401040316, now seen corresponding path program 1 times [2021-11-23 17:11:30,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:30,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [557828767] [2021-11-23 17:11:30,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:30,120 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:30,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:30,120 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:30,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Waiting until timeout for monitored process [2021-11-23 17:11:30,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:30,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:11:30,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:30,522 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:11:30,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:30,728 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:11:30,729 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:30,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [557828767] [2021-11-23 17:11:30,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [557828767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:30,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1969431855] [2021-11-23 17:11:30,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:30,729 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:30,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:30,730 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:30,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Waiting until timeout for monitored process [2021-11-23 17:11:30,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:30,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:11:30,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:31,041 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:11:31,041 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:11:31,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1969431855] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:11:31,041 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:11:31,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:11:31,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498736990] [2021-11-23 17:11:31,042 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:11:31,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:11:31,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:31,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:11:31,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:11:31,043 INFO L87 Difference]: Start difference. First operand 1226 states and 1554 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 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) [2021-11-23 17:11:31,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:31,212 INFO L93 Difference]: Finished difference Result 2270 states and 2899 transitions. [2021-11-23 17:11:31,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:11:31,212 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 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 100 [2021-11-23 17:11:31,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:31,214 INFO L225 Difference]: With dead ends: 2270 [2021-11-23 17:11:31,214 INFO L226 Difference]: Without dead ends: 1247 [2021-11-23 17:11:31,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 292 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:11:31,215 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 75 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:31,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 205 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:11:31,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1247 states. [2021-11-23 17:11:31,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1247 to 1182. [2021-11-23 17:11:31,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1182 states, 1181 states have (on average 1.2684165961049958) internal successors, (1498), 1181 states have internal predecessors, (1498), 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) [2021-11-23 17:11:31,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1182 states to 1182 states and 1498 transitions. [2021-11-23 17:11:31,375 INFO L78 Accepts]: Start accepts. Automaton has 1182 states and 1498 transitions. Word has length 100 [2021-11-23 17:11:31,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:31,376 INFO L470 AbstractCegarLoop]: Abstraction has 1182 states and 1498 transitions. [2021-11-23 17:11:31,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 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) [2021-11-23 17:11:31,376 INFO L276 IsEmpty]: Start isEmpty. Operand 1182 states and 1498 transitions. [2021-11-23 17:11:31,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:11:31,377 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:31,377 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:31,395 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Ended with exit code 0 [2021-11-23 17:11:31,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:31,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:11:31,780 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:31,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:31,780 INFO L85 PathProgramCache]: Analyzing trace with hash -1921972566, now seen corresponding path program 1 times [2021-11-23 17:11:31,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:31,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [509975041] [2021-11-23 17:11:31,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:31,781 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:31,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:31,782 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:31,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-23 17:11:31,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:31,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:11:31,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:33,311 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:33,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:33,702 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:33,702 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:33,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [509975041] [2021-11-23 17:11:33,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [509975041] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:33,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1813881870] [2021-11-23 17:11:33,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:33,703 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:33,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:33,704 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:33,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-23 17:11:33,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:33,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:11:33,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:35,521 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:35,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:35,839 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:35,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1813881870] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:35,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481794898] [2021-11-23 17:11:35,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:35,840 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:35,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:35,841 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:35,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 17:11:35,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:35,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:11:35,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:41,780 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:41,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:44,814 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:11:44,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [481794898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:44,815 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:44,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 22, 20] total 56 [2021-11-23 17:11:44,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815189295] [2021-11-23 17:11:44,815 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:44,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-23 17:11:44,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:44,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-23 17:11:44,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=2743, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 17:11:44,817 INFO L87 Difference]: Start difference. First operand 1182 states and 1498 transitions. Second operand has 56 states, 56 states have (on average 6.089285714285714) internal successors, (341), 56 states have internal predecessors, (341), 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) [2021-11-23 17:11:45,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:45,465 INFO L93 Difference]: Finished difference Result 1496 states and 1895 transitions. [2021-11-23 17:11:45,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:11:45,466 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 6.089285714285714) internal successors, (341), 56 states have internal predecessors, (341), 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 101 [2021-11-23 17:11:45,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:45,468 INFO L225 Difference]: With dead ends: 1496 [2021-11-23 17:11:45,468 INFO L226 Difference]: Without dead ends: 1150 [2021-11-23 17:11:45,469 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 604 GetRequests, 547 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1103 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=370, Invalid=3052, Unknown=0, NotChecked=0, Total=3422 [2021-11-23 17:11:45,469 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 187 mSDsluCounter, 2026 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 2128 SdHoareTripleChecker+Invalid, 414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 231 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:45,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 2128 Invalid, 414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 171 Invalid, 0 Unknown, 231 Unchecked, 0.2s Time] [2021-11-23 17:11:45,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1150 states. [2021-11-23 17:11:45,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1150 to 1086. [2021-11-23 17:11:45,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1086 states, 1085 states have (on average 1.2672811059907834) internal successors, (1375), 1085 states have internal predecessors, (1375), 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) [2021-11-23 17:11:45,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1086 states to 1086 states and 1375 transitions. [2021-11-23 17:11:45,637 INFO L78 Accepts]: Start accepts. Automaton has 1086 states and 1375 transitions. Word has length 101 [2021-11-23 17:11:45,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:45,638 INFO L470 AbstractCegarLoop]: Abstraction has 1086 states and 1375 transitions. [2021-11-23 17:11:45,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 6.089285714285714) internal successors, (341), 56 states have internal predecessors, (341), 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) [2021-11-23 17:11:45,638 INFO L276 IsEmpty]: Start isEmpty. Operand 1086 states and 1375 transitions. [2021-11-23 17:11:45,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:11:45,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:45,639 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:45,648 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Ended with exit code 0 [2021-11-23 17:11:45,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:46,065 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Ended with exit code 0 [2021-11-23 17:11:46,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:46,240 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:46,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:46,241 INFO L85 PathProgramCache]: Analyzing trace with hash 2101486209, now seen corresponding path program 1 times [2021-11-23 17:11:46,241 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:46,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1905314614] [2021-11-23 17:11:46,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:46,241 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:46,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:46,242 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:46,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:11:46,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:46,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:11:46,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:47,998 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 83 proven. 22 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:11:47,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:48,848 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 83 proven. 22 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:11:48,848 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:48,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1905314614] [2021-11-23 17:11:48,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1905314614] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:48,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [581708800] [2021-11-23 17:11:48,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:48,849 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:48,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:48,850 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:48,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:11:49,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:49,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:11:49,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:50,528 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 83 proven. 22 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:11:50,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:51,209 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 83 proven. 22 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:11:51,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [581708800] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:51,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910046302] [2021-11-23 17:11:51,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:51,210 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:51,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:51,211 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:51,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:11:51,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:51,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:11:51,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:52,171 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 83 proven. 20 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:11:52,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:52,896 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 83 proven. 20 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:11:52,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [910046302] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:52,896 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:11:52,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:11:52,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117574500] [2021-11-23 17:11:52,897 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:11:52,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:11:52,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:11:52,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:11:52,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:11:52,898 INFO L87 Difference]: Start difference. First operand 1086 states and 1375 transitions. Second operand has 22 states, 22 states have (on average 19.09090909090909) internal successors, (420), 21 states have internal predecessors, (420), 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) [2021-11-23 17:11:53,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:11:53,444 INFO L93 Difference]: Finished difference Result 2100 states and 2677 transitions. [2021-11-23 17:11:53,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:11:53,445 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 19.09090909090909) internal successors, (420), 21 states have internal predecessors, (420), 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 159 [2021-11-23 17:11:53,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:11:53,446 INFO L225 Difference]: With dead ends: 2100 [2021-11-23 17:11:53,446 INFO L226 Difference]: Without dead ends: 1121 [2021-11-23 17:11:53,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 961 GetRequests, 930 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=200, Invalid=856, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:11:53,448 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 220 mSDsluCounter, 802 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 897 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 131 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:11:53,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 897 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 80 Invalid, 0 Unknown, 131 Unchecked, 0.1s Time] [2021-11-23 17:11:53,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1121 states. [2021-11-23 17:11:53,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1121 to 1121. [2021-11-23 17:11:53,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1121 states, 1120 states have (on average 1.2625) internal successors, (1414), 1120 states have internal predecessors, (1414), 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) [2021-11-23 17:11:53,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1121 states to 1121 states and 1414 transitions. [2021-11-23 17:11:53,599 INFO L78 Accepts]: Start accepts. Automaton has 1121 states and 1414 transitions. Word has length 159 [2021-11-23 17:11:53,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:11:53,599 INFO L470 AbstractCegarLoop]: Abstraction has 1121 states and 1414 transitions. [2021-11-23 17:11:53,600 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 19.09090909090909) internal successors, (420), 21 states have internal predecessors, (420), 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) [2021-11-23 17:11:53,600 INFO L276 IsEmpty]: Start isEmpty. Operand 1121 states and 1414 transitions. [2021-11-23 17:11:53,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:11:53,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:11:53,601 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:11:53,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:53,811 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Forceful destruction successful, exit code 0 [2021-11-23 17:11:54,023 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-23 17:11:54,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:54,203 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:11:54,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:11:54,204 INFO L85 PathProgramCache]: Analyzing trace with hash 2011417468, now seen corresponding path program 1 times [2021-11-23 17:11:54,204 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:11:54,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [830481468] [2021-11-23 17:11:54,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:54,205 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:11:54,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:11:54,206 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:11:54,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:11:54,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:54,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:11:54,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:56,513 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 74 proven. 36 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:11:56,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:57,085 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 74 proven. 36 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:11:57,085 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:11:57,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [830481468] [2021-11-23 17:11:57,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [830481468] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:57,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [820740598] [2021-11-23 17:11:57,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:57,086 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:11:57,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:11:57,087 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:11:57,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 17:11:57,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:57,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:11:57,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:11:59,308 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 74 proven. 36 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:11:59,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:11:59,823 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 74 proven. 36 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:11:59,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [820740598] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:11:59,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050368763] [2021-11-23 17:11:59,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:11:59,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:11:59,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:11:59,825 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:11:59,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 17:11:59,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:11:59,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:11:59,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:00,859 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 74 proven. 30 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:12:00,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:01,823 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 74 proven. 30 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:12:01,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050368763] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:01,823 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:12:01,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:12:01,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286309950] [2021-11-23 17:12:01,824 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:12:01,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:12:01,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:01,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:12:01,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:12:01,825 INFO L87 Difference]: Start difference. First operand 1121 states and 1414 transitions. Second operand has 22 states, 22 states have (on average 20.181818181818183) internal successors, (444), 21 states have internal predecessors, (444), 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) [2021-11-23 17:12:02,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:02,330 INFO L93 Difference]: Finished difference Result 2144 states and 2725 transitions. [2021-11-23 17:12:02,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:12:02,331 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 20.181818181818183) internal successors, (444), 21 states have internal predecessors, (444), 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 159 [2021-11-23 17:12:02,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:02,333 INFO L225 Difference]: With dead ends: 2144 [2021-11-23 17:12:02,333 INFO L226 Difference]: Without dead ends: 1177 [2021-11-23 17:12:02,334 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 960 GetRequests, 932 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=155, Invalid=715, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:12:02,335 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 79 mSDsluCounter, 1040 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 1137 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 130 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:02,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 1137 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 130 Unchecked, 0.0s Time] [2021-11-23 17:12:02,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1177 states. [2021-11-23 17:12:02,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1177 to 1177. [2021-11-23 17:12:02,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1177 states, 1176 states have (on average 1.2551020408163265) internal successors, (1476), 1176 states have internal predecessors, (1476), 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) [2021-11-23 17:12:02,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1177 states to 1177 states and 1476 transitions. [2021-11-23 17:12:02,514 INFO L78 Accepts]: Start accepts. Automaton has 1177 states and 1476 transitions. Word has length 159 [2021-11-23 17:12:02,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:02,514 INFO L470 AbstractCegarLoop]: Abstraction has 1177 states and 1476 transitions. [2021-11-23 17:12:02,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 20.181818181818183) internal successors, (444), 21 states have internal predecessors, (444), 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) [2021-11-23 17:12:02,515 INFO L276 IsEmpty]: Start isEmpty. Operand 1177 states and 1476 transitions. [2021-11-23 17:12:02,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:12:02,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:02,516 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:12:02,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:02,727 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Ended with exit code 0 [2021-11-23 17:12:02,945 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2021-11-23 17:12:03,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:03,122 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:03,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:03,122 INFO L85 PathProgramCache]: Analyzing trace with hash 574251575, now seen corresponding path program 1 times [2021-11-23 17:12:03,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:03,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1361669620] [2021-11-23 17:12:03,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:03,123 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:03,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:03,124 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:03,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 17:12:03,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:03,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:12:03,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:05,257 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 65 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:12:05,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:06,055 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 65 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:12:06,056 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:06,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1361669620] [2021-11-23 17:12:06,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1361669620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:06,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [379739248] [2021-11-23 17:12:06,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:06,056 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:06,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:06,057 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:06,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-23 17:12:06,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:06,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:12:06,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:08,565 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 65 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:12:08,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:09,259 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 65 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:12:09,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [379739248] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:09,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749801483] [2021-11-23 17:12:09,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:09,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:09,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:12:09,271 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:12:09,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 17:12:09,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:09,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:12:09,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:10,068 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 65 proven. 40 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:12:10,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:10,980 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 65 proven. 40 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:12:10,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749801483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:10,980 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:12:10,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:12:10,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924382782] [2021-11-23 17:12:10,981 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:12:10,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:12:10,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:10,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:12:10,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:12:10,982 INFO L87 Difference]: Start difference. First operand 1177 states and 1476 transitions. Second operand has 22 states, 22 states have (on average 21.09090909090909) internal successors, (464), 21 states have internal predecessors, (464), 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) [2021-11-23 17:12:11,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:11,388 INFO L93 Difference]: Finished difference Result 2206 states and 2791 transitions. [2021-11-23 17:12:11,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:12:11,389 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 21.09090909090909) internal successors, (464), 21 states have internal predecessors, (464), 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 159 [2021-11-23 17:12:11,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:11,390 INFO L225 Difference]: With dead ends: 2206 [2021-11-23 17:12:11,390 INFO L226 Difference]: Without dead ends: 1251 [2021-11-23 17:12:11,391 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 960 GetRequests, 932 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=158, Invalid=712, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:12:11,392 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 83 mSDsluCounter, 1105 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 1205 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:11,392 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 1205 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 66 Invalid, 0 Unknown, 140 Unchecked, 0.0s Time] [2021-11-23 17:12:11,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1251 states. [2021-11-23 17:12:11,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1251 to 1251. [2021-11-23 17:12:11,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1251 states, 1250 states have (on average 1.2448) internal successors, (1556), 1250 states have internal predecessors, (1556), 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) [2021-11-23 17:12:11,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1251 states to 1251 states and 1556 transitions. [2021-11-23 17:12:11,539 INFO L78 Accepts]: Start accepts. Automaton has 1251 states and 1556 transitions. Word has length 159 [2021-11-23 17:12:11,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:11,539 INFO L470 AbstractCegarLoop]: Abstraction has 1251 states and 1556 transitions. [2021-11-23 17:12:11,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 21.09090909090909) internal successors, (464), 21 states have internal predecessors, (464), 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) [2021-11-23 17:12:11,539 INFO L276 IsEmpty]: Start isEmpty. Operand 1251 states and 1556 transitions. [2021-11-23 17:12:11,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:12:11,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:11,541 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:12:11,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:11,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:11,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:12,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:12:12,141 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:12,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:12,142 INFO L85 PathProgramCache]: Analyzing trace with hash 926946994, now seen corresponding path program 1 times [2021-11-23 17:12:12,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:12,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1162522093] [2021-11-23 17:12:12,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:12,143 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:12,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:12,144 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:12,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 17:12:12,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:12,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:12:12,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:14,656 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:14,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:15,443 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:15,444 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:15,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1162522093] [2021-11-23 17:12:15,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1162522093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:15,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [508708041] [2021-11-23 17:12:15,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:15,444 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:15,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:15,445 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:15,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 17:12:15,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:15,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:12:15,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:17,966 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:17,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:18,682 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:18,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [508708041] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:18,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479519785] [2021-11-23 17:12:18,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:18,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:18,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:12:18,684 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:12:18,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 17:12:18,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:18,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:12:18,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:20,853 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 63 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:12:20,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:21,934 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 63 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:12:21,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479519785] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:21,935 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:12:21,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:12:21,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944495140] [2021-11-23 17:12:21,936 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:12:21,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:12:21,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:21,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:12:21,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:12:21,937 INFO L87 Difference]: Start difference. First operand 1251 states and 1556 transitions. Second operand has 34 states, 34 states have (on average 14.411764705882353) internal successors, (490), 33 states have internal predecessors, (490), 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) [2021-11-23 17:12:22,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:22,549 INFO L93 Difference]: Finished difference Result 2170 states and 2737 transitions. [2021-11-23 17:12:22,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:12:22,550 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 14.411764705882353) internal successors, (490), 33 states have internal predecessors, (490), 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 159 [2021-11-23 17:12:22,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:22,552 INFO L225 Difference]: With dead ends: 2170 [2021-11-23 17:12:22,552 INFO L226 Difference]: Without dead ends: 1263 [2021-11-23 17:12:22,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 961 GetRequests, 919 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=241, Invalid=1651, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:12:22,553 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 172 mSDsluCounter, 1606 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 1712 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:22,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [172 Valid, 1712 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 140 Unchecked, 0.0s Time] [2021-11-23 17:12:22,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1263 states. [2021-11-23 17:12:22,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1263 to 1263. [2021-11-23 17:12:22,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1263 states, 1262 states have (on average 1.242472266244057) internal successors, (1568), 1262 states have internal predecessors, (1568), 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) [2021-11-23 17:12:22,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1263 states to 1263 states and 1568 transitions. [2021-11-23 17:12:22,710 INFO L78 Accepts]: Start accepts. Automaton has 1263 states and 1568 transitions. Word has length 159 [2021-11-23 17:12:22,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:22,711 INFO L470 AbstractCegarLoop]: Abstraction has 1263 states and 1568 transitions. [2021-11-23 17:12:22,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 14.411764705882353) internal successors, (490), 33 states have internal predecessors, (490), 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) [2021-11-23 17:12:22,711 INFO L276 IsEmpty]: Start isEmpty. Operand 1263 states and 1568 transitions. [2021-11-23 17:12:22,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:12:22,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:22,712 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:12:22,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:22,915 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:23,120 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Ended with exit code 0 [2021-11-23 17:12:23,313 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:12:23,313 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:23,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:23,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1517372192, now seen corresponding path program 1 times [2021-11-23 17:12:23,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:23,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [46316806] [2021-11-23 17:12:23,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:23,314 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:23,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:23,315 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:23,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 17:12:23,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:23,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:12:23,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:26,248 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 29 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:26,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:26,858 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 29 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:26,859 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:26,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [46316806] [2021-11-23 17:12:26,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [46316806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:26,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [779516463] [2021-11-23 17:12:26,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:26,859 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:26,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:26,860 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:26,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 17:12:27,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:27,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:12:27,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:29,845 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 29 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:29,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:30,257 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 29 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:30,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [779516463] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:30,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1938926120] [2021-11-23 17:12:30,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:30,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:30,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:12:30,258 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:12:30,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 17:12:30,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:30,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:12:30,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:32,846 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 29 proven. 87 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:12:32,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:33,801 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 29 proven. 87 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:12:33,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1938926120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:33,802 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:12:33,802 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:12:33,802 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182072749] [2021-11-23 17:12:33,802 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:12:33,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:12:33,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:33,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:12:33,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:12:33,804 INFO L87 Difference]: Start difference. First operand 1263 states and 1568 transitions. Second operand has 34 states, 34 states have (on average 15.205882352941176) internal successors, (517), 33 states have internal predecessors, (517), 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) [2021-11-23 17:12:34,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:34,587 INFO L93 Difference]: Finished difference Result 2416 states and 3009 transitions. [2021-11-23 17:12:34,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:12:34,588 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.205882352941176) internal successors, (517), 33 states have internal predecessors, (517), 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 159 [2021-11-23 17:12:34,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:34,590 INFO L225 Difference]: With dead ends: 2416 [2021-11-23 17:12:34,590 INFO L226 Difference]: Without dead ends: 1527 [2021-11-23 17:12:34,591 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 920 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=257, Invalid=1635, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:12:34,592 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 223 mSDsluCounter, 1732 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 1847 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 233 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:34,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 1847 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 102 Invalid, 0 Unknown, 233 Unchecked, 0.1s Time] [2021-11-23 17:12:34,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1527 states. [2021-11-23 17:12:34,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1527 to 1527. [2021-11-23 17:12:34,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1527 states, 1526 states have (on average 1.2214941022280472) internal successors, (1864), 1526 states have internal predecessors, (1864), 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) [2021-11-23 17:12:34,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1527 states to 1527 states and 1864 transitions. [2021-11-23 17:12:34,891 INFO L78 Accepts]: Start accepts. Automaton has 1527 states and 1864 transitions. Word has length 159 [2021-11-23 17:12:34,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:34,892 INFO L470 AbstractCegarLoop]: Abstraction has 1527 states and 1864 transitions. [2021-11-23 17:12:34,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.205882352941176) internal successors, (517), 33 states have internal predecessors, (517), 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) [2021-11-23 17:12:34,892 INFO L276 IsEmpty]: Start isEmpty. Operand 1527 states and 1864 transitions. [2021-11-23 17:12:34,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:12:34,893 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:34,894 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:12:34,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:35,097 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Ended with exit code 0 [2021-11-23 17:12:35,320 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Ended with exit code 0 [2021-11-23 17:12:35,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:35,495 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:35,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:35,496 INFO L85 PathProgramCache]: Analyzing trace with hash 946776236, now seen corresponding path program 1 times [2021-11-23 17:12:35,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:35,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1287438049] [2021-11-23 17:12:35,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:35,497 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:35,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:35,498 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:35,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 17:12:35,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:35,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:12:35,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:38,109 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 38 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:38,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:39,015 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 38 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:39,015 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:39,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1287438049] [2021-11-23 17:12:39,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1287438049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:39,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [534245952] [2021-11-23 17:12:39,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:39,015 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:39,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:39,016 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:39,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-23 17:12:39,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:39,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:12:39,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:42,004 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 38 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:42,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:42,696 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 38 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:12:42,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [534245952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:42,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598950950] [2021-11-23 17:12:42,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:42,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:42,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:12:42,703 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:12:42,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 17:12:42,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:42,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:12:42,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:45,373 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 38 proven. 80 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:12:45,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:46,241 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 38 proven. 80 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:12:46,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598950950] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:46,242 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:12:46,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:12:46,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463114183] [2021-11-23 17:12:46,243 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:12:46,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:12:46,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:46,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:12:46,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:12:46,246 INFO L87 Difference]: Start difference. First operand 1527 states and 1864 transitions. Second operand has 34 states, 34 states have (on average 14.764705882352942) internal successors, (502), 33 states have internal predecessors, (502), 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) [2021-11-23 17:12:47,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:47,173 INFO L93 Difference]: Finished difference Result 2616 states and 3239 transitions. [2021-11-23 17:12:47,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:12:47,174 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 14.764705882352942) internal successors, (502), 33 states have internal predecessors, (502), 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 159 [2021-11-23 17:12:47,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:47,176 INFO L225 Difference]: With dead ends: 2616 [2021-11-23 17:12:47,176 INFO L226 Difference]: Without dead ends: 1715 [2021-11-23 17:12:47,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 961 GetRequests, 918 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=279, Invalid=1701, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:12:47,178 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 262 mSDsluCounter, 1893 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 2004 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 242 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:47,178 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [262 Valid, 2004 Invalid, 377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 126 Invalid, 0 Unknown, 242 Unchecked, 0.1s Time] [2021-11-23 17:12:47,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1715 states. [2021-11-23 17:12:47,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1715 to 1715. [2021-11-23 17:12:47,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1715 states, 1714 states have (on average 1.2112018669778297) internal successors, (2076), 1714 states have internal predecessors, (2076), 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) [2021-11-23 17:12:47,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1715 states to 1715 states and 2076 transitions. [2021-11-23 17:12:47,470 INFO L78 Accepts]: Start accepts. Automaton has 1715 states and 2076 transitions. Word has length 159 [2021-11-23 17:12:47,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:47,470 INFO L470 AbstractCegarLoop]: Abstraction has 1715 states and 2076 transitions. [2021-11-23 17:12:47,471 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 14.764705882352942) internal successors, (502), 33 states have internal predecessors, (502), 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) [2021-11-23 17:12:47,471 INFO L276 IsEmpty]: Start isEmpty. Operand 1715 states and 2076 transitions. [2021-11-23 17:12:47,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:12:47,472 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:47,473 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:12:47,482 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Ended with exit code 0 [2021-11-23 17:12:47,694 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-23 17:12:47,876 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Ended with exit code 0 [2021-11-23 17:12:48,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:48,074 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:48,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:48,074 INFO L85 PathProgramCache]: Analyzing trace with hash -504659502, now seen corresponding path program 1 times [2021-11-23 17:12:48,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:48,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1929318513] [2021-11-23 17:12:48,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:48,075 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:48,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:48,075 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:48,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 17:12:48,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:48,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:12:48,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:50,020 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 69 proven. 43 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:12:50,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:50,628 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 69 proven. 43 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:12:50,628 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:50,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1929318513] [2021-11-23 17:12:50,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1929318513] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:50,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [849703036] [2021-11-23 17:12:50,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:50,629 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:50,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:50,629 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:50,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2021-11-23 17:12:50,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:50,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:12:50,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:52,877 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 69 proven. 43 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:12:52,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:53,378 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 69 proven. 43 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:12:53,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [849703036] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:53,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596106472] [2021-11-23 17:12:53,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:53,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:12:53,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:12:53,379 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:12:53,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-23 17:12:53,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:53,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:12:53,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:54,225 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 69 proven. 35 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:12:54,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:55,005 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 69 proven. 35 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:12:55,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596106472] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:55,005 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:12:55,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:12:55,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683203326] [2021-11-23 17:12:55,006 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:12:55,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:12:55,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:12:55,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:12:55,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:12:55,008 INFO L87 Difference]: Start difference. First operand 1715 states and 2076 transitions. Second operand has 22 states, 22 states have (on average 20.636363636363637) internal successors, (454), 21 states have internal predecessors, (454), 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) [2021-11-23 17:12:55,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:12:55,575 INFO L93 Difference]: Finished difference Result 3102 states and 3791 transitions. [2021-11-23 17:12:55,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:12:55,576 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 20.636363636363637) internal successors, (454), 21 states have internal predecessors, (454), 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 159 [2021-11-23 17:12:55,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:12:55,578 INFO L225 Difference]: With dead ends: 3102 [2021-11-23 17:12:55,578 INFO L226 Difference]: Without dead ends: 2141 [2021-11-23 17:12:55,579 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 961 GetRequests, 931 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:12:55,579 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 140 mSDsluCounter, 1092 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 1192 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 138 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:12:55,579 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 1192 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 79 Invalid, 0 Unknown, 138 Unchecked, 0.0s Time] [2021-11-23 17:12:55,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2141 states. [2021-11-23 17:12:55,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2141 to 2141. [2021-11-23 17:12:55,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2141 states, 2140 states have (on average 1.1878504672897197) internal successors, (2542), 2140 states have internal predecessors, (2542), 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) [2021-11-23 17:12:55,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2141 states to 2141 states and 2542 transitions. [2021-11-23 17:12:55,833 INFO L78 Accepts]: Start accepts. Automaton has 2141 states and 2542 transitions. Word has length 159 [2021-11-23 17:12:55,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:12:55,833 INFO L470 AbstractCegarLoop]: Abstraction has 2141 states and 2542 transitions. [2021-11-23 17:12:55,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 20.636363636363637) internal successors, (454), 21 states have internal predecessors, (454), 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) [2021-11-23 17:12:55,834 INFO L276 IsEmpty]: Start isEmpty. Operand 2141 states and 2542 transitions. [2021-11-23 17:12:55,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:12:55,835 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:12:55,836 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:12:55,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:12:56,043 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Ended with exit code 0 [2021-11-23 17:12:56,238 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Ended with exit code 0 [2021-11-23 17:12:56,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:56,436 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:12:56,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:12:56,437 INFO L85 PathProgramCache]: Analyzing trace with hash -428710569, now seen corresponding path program 1 times [2021-11-23 17:12:56,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:12:56,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [763692248] [2021-11-23 17:12:56,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:56,438 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:12:56,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:12:56,439 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:12:56,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-23 17:12:56,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:56,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:12:56,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:12:58,108 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 78 proven. 29 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:12:58,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:12:58,500 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 78 proven. 29 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:12:58,501 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:12:58,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [763692248] [2021-11-23 17:12:58,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [763692248] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:12:58,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1026044417] [2021-11-23 17:12:58,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:12:58,501 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:12:58,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:12:58,502 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:12:58,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Waiting until timeout for monitored process [2021-11-23 17:12:58,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:12:58,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:12:58,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:00,279 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 78 proven. 29 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:13:00,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:00,621 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 78 proven. 29 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:13:00,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1026044417] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:00,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112977023] [2021-11-23 17:13:00,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:00,622 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:00,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:00,623 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:00,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-23 17:13:00,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:00,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:13:00,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:01,460 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 78 proven. 25 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:13:01,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:02,213 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 78 proven. 25 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:13:02,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112977023] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:02,213 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:13:02,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:13:02,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512067719] [2021-11-23 17:13:02,214 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:13:02,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:13:02,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:02,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:13:02,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:13:02,216 INFO L87 Difference]: Start difference. First operand 2141 states and 2542 transitions. Second operand has 22 states, 22 states have (on average 19.727272727272727) internal successors, (434), 21 states have internal predecessors, (434), 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) [2021-11-23 17:13:02,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:02,835 INFO L93 Difference]: Finished difference Result 3114 states and 3797 transitions. [2021-11-23 17:13:02,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:13:02,836 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 19.727272727272727) internal successors, (434), 21 states have internal predecessors, (434), 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 159 [2021-11-23 17:13:02,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:02,838 INFO L225 Difference]: With dead ends: 3114 [2021-11-23 17:13:02,838 INFO L226 Difference]: Without dead ends: 2141 [2021-11-23 17:13:02,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 961 GetRequests, 931 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=182, Invalid=810, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:13:02,839 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 148 mSDsluCounter, 909 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 1005 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:02,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 1005 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 62 Invalid, 0 Unknown, 118 Unchecked, 0.0s Time] [2021-11-23 17:13:02,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2141 states. [2021-11-23 17:13:03,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2141 to 2141. [2021-11-23 17:13:03,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2141 states, 2140 states have (on average 1.1803738317757009) internal successors, (2526), 2140 states have internal predecessors, (2526), 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) [2021-11-23 17:13:03,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2141 states to 2141 states and 2526 transitions. [2021-11-23 17:13:03,122 INFO L78 Accepts]: Start accepts. Automaton has 2141 states and 2526 transitions. Word has length 159 [2021-11-23 17:13:03,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:03,122 INFO L470 AbstractCegarLoop]: Abstraction has 2141 states and 2526 transitions. [2021-11-23 17:13:03,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 19.727272727272727) internal successors, (434), 21 states have internal predecessors, (434), 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) [2021-11-23 17:13:03,122 INFO L276 IsEmpty]: Start isEmpty. Operand 2141 states and 2526 transitions. [2021-11-23 17:13:03,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:13:03,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:03,125 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:03,133 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:03,350 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2021-11-23 17:13:03,528 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:03,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:03,726 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:03,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:03,726 INFO L85 PathProgramCache]: Analyzing trace with hash 1891839353, now seen corresponding path program 1 times [2021-11-23 17:13:03,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:03,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1030948579] [2021-11-23 17:13:03,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:03,727 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:03,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:03,728 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:03,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2021-11-23 17:13:03,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:03,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:13:03,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:04,735 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:13:04,735 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:13:04,735 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:04,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1030948579] [2021-11-23 17:13:04,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1030948579] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:13:04,736 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:13:04,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:13:04,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397418490] [2021-11-23 17:13:04,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:13:04,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:13:04,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:04,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:13:04,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:13:04,737 INFO L87 Difference]: Start difference. First operand 2141 states and 2526 transitions. Second operand has 5 states, 5 states have (on average 28.0) internal successors, (140), 4 states have internal predecessors, (140), 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) [2021-11-23 17:13:05,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:05,156 INFO L93 Difference]: Finished difference Result 4077 states and 5038 transitions. [2021-11-23 17:13:05,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:13:05,157 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 28.0) internal successors, (140), 4 states have internal predecessors, (140), 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 160 [2021-11-23 17:13:05,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:05,160 INFO L225 Difference]: With dead ends: 4077 [2021-11-23 17:13:05,160 INFO L226 Difference]: Without dead ends: 3098 [2021-11-23 17:13:05,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:13:05,162 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 77 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:05,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 328 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 83 Unchecked, 0.0s Time] [2021-11-23 17:13:05,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3098 states. [2021-11-23 17:13:05,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3098 to 3096. [2021-11-23 17:13:05,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3096 states, 3095 states have (on average 1.210016155088853) internal successors, (3745), 3095 states have internal predecessors, (3745), 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) [2021-11-23 17:13:05,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3096 states to 3096 states and 3745 transitions. [2021-11-23 17:13:05,614 INFO L78 Accepts]: Start accepts. Automaton has 3096 states and 3745 transitions. Word has length 160 [2021-11-23 17:13:05,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:05,614 INFO L470 AbstractCegarLoop]: Abstraction has 3096 states and 3745 transitions. [2021-11-23 17:13:05,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 28.0) internal successors, (140), 4 states have internal predecessors, (140), 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) [2021-11-23 17:13:05,615 INFO L276 IsEmpty]: Start isEmpty. Operand 3096 states and 3745 transitions. [2021-11-23 17:13:05,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:13:05,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:05,618 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:05,627 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Ended with exit code 0 [2021-11-23 17:13:05,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:13:05,818 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:05,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:05,819 INFO L85 PathProgramCache]: Analyzing trace with hash 737129380, now seen corresponding path program 1 times [2021-11-23 17:13:05,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:05,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [757383160] [2021-11-23 17:13:05,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:05,820 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:05,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:05,821 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:05,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 17:13:06,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:06,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:13:06,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:07,742 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 38 proven. 60 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:13:07,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:08,290 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 38 proven. 60 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:13:08,290 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:08,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [757383160] [2021-11-23 17:13:08,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [757383160] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:08,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1824756610] [2021-11-23 17:13:08,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:08,291 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:08,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:08,291 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:08,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Waiting until timeout for monitored process [2021-11-23 17:13:08,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:08,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:13:08,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:10,208 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 38 proven. 60 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:13:10,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:10,558 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 38 proven. 60 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:13:10,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1824756610] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:10,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885407200] [2021-11-23 17:13:10,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:10,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:10,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:10,560 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:10,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-23 17:13:10,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:10,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:13:10,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:12,327 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 38 proven. 60 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:13:12,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:12,681 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 38 proven. 60 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:13:12,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885407200] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:12,682 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:13:12,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:13:12,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792881366] [2021-11-23 17:13:12,682 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:13:12,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:13:12,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:12,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:13:12,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:13:12,684 INFO L87 Difference]: Start difference. First operand 3096 states and 3745 transitions. Second operand has 16 states, 16 states have (on average 16.875) internal successors, (270), 15 states have internal predecessors, (270), 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) [2021-11-23 17:13:13,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:13,301 INFO L93 Difference]: Finished difference Result 4019 states and 4924 transitions. [2021-11-23 17:13:13,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:13:13,301 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 16.875) internal successors, (270), 15 states have internal predecessors, (270), 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 160 [2021-11-23 17:13:13,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:13,305 INFO L225 Difference]: With dead ends: 4019 [2021-11-23 17:13:13,305 INFO L226 Difference]: Without dead ends: 3118 [2021-11-23 17:13:13,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 964 GetRequests, 943 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2021-11-23 17:13:13,307 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 212 mSDsluCounter, 980 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 1120 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:13,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 1120 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 103 Unchecked, 0.0s Time] [2021-11-23 17:13:13,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3118 states. [2021-11-23 17:13:13,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3118 to 3096. [2021-11-23 17:13:13,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3096 states, 3095 states have (on average 1.2064620355411955) internal successors, (3734), 3095 states have internal predecessors, (3734), 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) [2021-11-23 17:13:13,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3096 states to 3096 states and 3734 transitions. [2021-11-23 17:13:13,805 INFO L78 Accepts]: Start accepts. Automaton has 3096 states and 3734 transitions. Word has length 160 [2021-11-23 17:13:13,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:13,805 INFO L470 AbstractCegarLoop]: Abstraction has 3096 states and 3734 transitions. [2021-11-23 17:13:13,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 16.875) internal successors, (270), 15 states have internal predecessors, (270), 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) [2021-11-23 17:13:13,806 INFO L276 IsEmpty]: Start isEmpty. Operand 3096 states and 3734 transitions. [2021-11-23 17:13:13,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:13:13,808 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:13,809 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:13,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:14,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:14,230 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Ended with exit code 0 [2021-11-23 17:13:14,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:14,410 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:14,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:14,410 INFO L85 PathProgramCache]: Analyzing trace with hash 1165689343, now seen corresponding path program 1 times [2021-11-23 17:13:14,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:14,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1650219845] [2021-11-23 17:13:14,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:14,411 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:14,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:14,412 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:14,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Waiting until timeout for monitored process [2021-11-23 17:13:14,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:14,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:13:14,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:16,230 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 29 proven. 62 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:13:16,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:16,792 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 29 proven. 62 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:13:16,792 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:16,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1650219845] [2021-11-23 17:13:16,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1650219845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:16,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [273128774] [2021-11-23 17:13:16,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:16,793 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:16,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:16,793 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:16,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (115)] Waiting until timeout for monitored process [2021-11-23 17:13:17,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:17,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:13:17,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:18,941 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 29 proven. 62 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:13:18,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:19,429 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 29 proven. 62 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:13:19,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [273128774] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:19,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170560534] [2021-11-23 17:13:19,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:19,429 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:19,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:19,430 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:19,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2021-11-23 17:13:19,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:19,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:13:19,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:21,372 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 29 proven. 62 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:13:21,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:21,824 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 29 proven. 62 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:13:21,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170560534] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:21,824 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:13:21,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:13:21,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375599098] [2021-11-23 17:13:21,825 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:13:21,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:13:21,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:21,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:13:21,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:13:21,826 INFO L87 Difference]: Start difference. First operand 3096 states and 3734 transitions. Second operand has 16 states, 16 states have (on average 16.625) internal successors, (266), 15 states have internal predecessors, (266), 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) [2021-11-23 17:13:22,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:22,681 INFO L93 Difference]: Finished difference Result 5779 states and 7209 transitions. [2021-11-23 17:13:22,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:13:22,682 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 16.625) internal successors, (266), 15 states have internal predecessors, (266), 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 160 [2021-11-23 17:13:22,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:22,686 INFO L225 Difference]: With dead ends: 5779 [2021-11-23 17:13:22,686 INFO L226 Difference]: Without dead ends: 4890 [2021-11-23 17:13:22,688 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 964 GetRequests, 942 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:13:22,688 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 190 mSDsluCounter, 959 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 1090 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:22,688 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 1090 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 93 Invalid, 0 Unknown, 140 Unchecked, 0.1s Time] [2021-11-23 17:13:22,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4890 states. [2021-11-23 17:13:23,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4890 to 4870. [2021-11-23 17:13:23,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4870 states, 4869 states have (on average 1.2343397001437666) internal successors, (6010), 4869 states have internal predecessors, (6010), 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) [2021-11-23 17:13:23,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4870 states to 4870 states and 6010 transitions. [2021-11-23 17:13:23,309 INFO L78 Accepts]: Start accepts. Automaton has 4870 states and 6010 transitions. Word has length 160 [2021-11-23 17:13:23,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:23,310 INFO L470 AbstractCegarLoop]: Abstraction has 4870 states and 6010 transitions. [2021-11-23 17:13:23,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 16.625) internal successors, (266), 15 states have internal predecessors, (266), 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) [2021-11-23 17:13:23,310 INFO L276 IsEmpty]: Start isEmpty. Operand 4870 states and 6010 transitions. [2021-11-23 17:13:23,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:13:23,313 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:23,313 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:23,322 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Ended with exit code 0 [2021-11-23 17:13:23,516 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (115)] Ended with exit code 0 [2021-11-23 17:13:23,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Ended with exit code 0 [2021-11-23 17:13:23,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:23,914 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:23,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:23,914 INFO L85 PathProgramCache]: Analyzing trace with hash -780393418, now seen corresponding path program 1 times [2021-11-23 17:13:23,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:23,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [222201919] [2021-11-23 17:13:23,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:23,915 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:23,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:23,916 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:23,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Waiting until timeout for monitored process [2021-11-23 17:13:24,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:24,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:13:24,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:24,879 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 17:13:24,879 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:13:24,879 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:24,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [222201919] [2021-11-23 17:13:24,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [222201919] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:13:24,879 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:13:24,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:13:24,879 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381112401] [2021-11-23 17:13:24,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:13:24,880 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:13:24,880 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:24,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:13:24,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:13:24,880 INFO L87 Difference]: Start difference. First operand 4870 states and 6010 transitions. Second operand has 5 states, 5 states have (on average 27.2) internal successors, (136), 4 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) [2021-11-23 17:13:25,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:25,588 INFO L93 Difference]: Finished difference Result 6678 states and 8351 transitions. [2021-11-23 17:13:25,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:13:25,588 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 27.2) internal successors, (136), 4 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) Word has length 160 [2021-11-23 17:13:25,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:25,594 INFO L225 Difference]: With dead ends: 6678 [2021-11-23 17:13:25,594 INFO L226 Difference]: Without dead ends: 5705 [2021-11-23 17:13:25,596 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:13:25,597 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 73 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:25,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 326 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 63 Unchecked, 0.0s Time] [2021-11-23 17:13:25,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5705 states. [2021-11-23 17:13:26,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5705 to 5703. [2021-11-23 17:13:26,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5703 states, 5702 states have (on average 1.2365836548579445) internal successors, (7051), 5702 states have internal predecessors, (7051), 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) [2021-11-23 17:13:26,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5703 states to 5703 states and 7051 transitions. [2021-11-23 17:13:26,355 INFO L78 Accepts]: Start accepts. Automaton has 5703 states and 7051 transitions. Word has length 160 [2021-11-23 17:13:26,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:26,355 INFO L470 AbstractCegarLoop]: Abstraction has 5703 states and 7051 transitions. [2021-11-23 17:13:26,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 27.2) internal successors, (136), 4 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) [2021-11-23 17:13:26,356 INFO L276 IsEmpty]: Start isEmpty. Operand 5703 states and 7051 transitions. [2021-11-23 17:13:26,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:13:26,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:26,358 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:26,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:26,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:13:26,559 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:26,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:26,560 INFO L85 PathProgramCache]: Analyzing trace with hash 210988945, now seen corresponding path program 1 times [2021-11-23 17:13:26,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:26,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1951300782] [2021-11-23 17:13:26,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:26,560 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:26,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:26,561 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:26,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Waiting until timeout for monitored process [2021-11-23 17:13:26,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:26,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:13:26,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:27,600 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 17:13:27,600 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:13:27,601 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:27,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1951300782] [2021-11-23 17:13:27,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1951300782] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:13:27,601 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:13:27,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:13:27,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677253349] [2021-11-23 17:13:27,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:13:27,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:13:27,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:27,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:13:27,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:13:27,602 INFO L87 Difference]: Start difference. First operand 5703 states and 7051 transitions. Second operand has 5 states, 5 states have (on average 25.6) internal successors, (128), 4 states have internal predecessors, (128), 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) [2021-11-23 17:13:28,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:28,951 INFO L93 Difference]: Finished difference Result 11328 states and 14247 transitions. [2021-11-23 17:13:28,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:13:28,951 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 25.6) internal successors, (128), 4 states have internal predecessors, (128), 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 160 [2021-11-23 17:13:28,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:28,960 INFO L225 Difference]: With dead ends: 11328 [2021-11-23 17:13:28,960 INFO L226 Difference]: Without dead ends: 10367 [2021-11-23 17:13:28,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:13:28,962 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 109 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 57 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:28,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 276 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 57 Unchecked, 0.0s Time] [2021-11-23 17:13:28,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10367 states. [2021-11-23 17:13:30,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10367 to 10365. [2021-11-23 17:13:30,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10365 states, 10364 states have (on average 1.2471053647240449) internal successors, (12925), 10364 states have internal predecessors, (12925), 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) [2021-11-23 17:13:30,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10365 states to 10365 states and 12925 transitions. [2021-11-23 17:13:30,388 INFO L78 Accepts]: Start accepts. Automaton has 10365 states and 12925 transitions. Word has length 160 [2021-11-23 17:13:30,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:30,389 INFO L470 AbstractCegarLoop]: Abstraction has 10365 states and 12925 transitions. [2021-11-23 17:13:30,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 25.6) internal successors, (128), 4 states have internal predecessors, (128), 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) [2021-11-23 17:13:30,389 INFO L276 IsEmpty]: Start isEmpty. Operand 10365 states and 12925 transitions. [2021-11-23 17:13:30,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:13:30,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:30,394 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:30,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:30,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:13:30,594 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:30,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:30,595 INFO L85 PathProgramCache]: Analyzing trace with hash -842772852, now seen corresponding path program 1 times [2021-11-23 17:13:30,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:30,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1344102619] [2021-11-23 17:13:30,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:30,595 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:30,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:30,596 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:30,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (119)] Waiting until timeout for monitored process [2021-11-23 17:13:30,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:30,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:13:30,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:33,667 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:33,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:34,313 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:34,314 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:34,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1344102619] [2021-11-23 17:13:34,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1344102619] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:34,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2142229250] [2021-11-23 17:13:34,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:34,314 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:34,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:34,315 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:34,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (120)] Waiting until timeout for monitored process [2021-11-23 17:13:34,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:34,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:13:34,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:37,467 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:37,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:38,046 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:38,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2142229250] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:38,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024687517] [2021-11-23 17:13:38,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:38,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:38,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:38,048 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:38,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-23 17:13:38,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:38,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:13:38,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:40,873 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 94 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:13:40,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:41,889 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 94 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:13:41,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024687517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:41,889 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:13:41,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:13:41,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957435191] [2021-11-23 17:13:41,890 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:13:41,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:13:41,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:41,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:13:41,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:13:41,893 INFO L87 Difference]: Start difference. First operand 10365 states and 12925 transitions. Second operand has 34 states, 34 states have (on average 15.5) internal successors, (527), 33 states have internal predecessors, (527), 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) [2021-11-23 17:13:43,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:43,871 INFO L93 Difference]: Finished difference Result 12859 states and 16020 transitions. [2021-11-23 17:13:43,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:13:43,871 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.5) internal successors, (527), 33 states have internal predecessors, (527), 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 160 [2021-11-23 17:13:43,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:43,882 INFO L225 Difference]: With dead ends: 12859 [2021-11-23 17:13:43,882 INFO L226 Difference]: Without dead ends: 11165 [2021-11-23 17:13:43,885 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 926 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=253, Invalid=1639, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:13:43,885 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 164 mSDsluCounter, 1705 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 1822 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 186 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:43,885 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 1822 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 114 Invalid, 0 Unknown, 186 Unchecked, 0.1s Time] [2021-11-23 17:13:43,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11165 states. [2021-11-23 17:13:45,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11165 to 11165. [2021-11-23 17:13:45,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11165 states, 11164 states have (on average 1.2390720171981369) internal successors, (13833), 11164 states have internal predecessors, (13833), 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) [2021-11-23 17:13:45,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11165 states to 11165 states and 13833 transitions. [2021-11-23 17:13:45,410 INFO L78 Accepts]: Start accepts. Automaton has 11165 states and 13833 transitions. Word has length 160 [2021-11-23 17:13:45,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:13:45,410 INFO L470 AbstractCegarLoop]: Abstraction has 11165 states and 13833 transitions. [2021-11-23 17:13:45,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.5) internal successors, (527), 33 states have internal predecessors, (527), 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) [2021-11-23 17:13:45,410 INFO L276 IsEmpty]: Start isEmpty. Operand 11165 states and 13833 transitions. [2021-11-23 17:13:45,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:13:45,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:13:45,415 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:13:45,436 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Ended with exit code 0 [2021-11-23 17:13:45,623 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (119)] Ended with exit code 0 [2021-11-23 17:13:45,821 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (120)] Forceful destruction successful, exit code 0 [2021-11-23 17:13:46,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:46,016 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:13:46,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:13:46,016 INFO L85 PathProgramCache]: Analyzing trace with hash -269655819, now seen corresponding path program 1 times [2021-11-23 17:13:46,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:13:46,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [803312784] [2021-11-23 17:13:46,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:46,017 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:13:46,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:13:46,018 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:13:46,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (122)] Waiting until timeout for monitored process [2021-11-23 17:13:46,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:46,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:13:46,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:48,791 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:48,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:49,324 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:49,325 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:13:49,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [803312784] [2021-11-23 17:13:49,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [803312784] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:49,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1256176374] [2021-11-23 17:13:49,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:49,325 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:13:49,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:13:49,326 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:13:49,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (123)] Waiting until timeout for monitored process [2021-11-23 17:13:49,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:49,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:13:49,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:52,772 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:52,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:53,223 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:13:53,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1256176374] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:53,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048456317] [2021-11-23 17:13:53,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:13:53,224 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:13:53,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:13:53,224 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:13:53,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process [2021-11-23 17:13:53,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:13:53,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:13:53,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:13:55,697 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 87 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:13:55,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:13:56,455 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 87 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:13:56,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048456317] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:13:56,455 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:13:56,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:13:56,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205372438] [2021-11-23 17:13:56,456 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:13:56,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:13:56,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:13:56,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:13:56,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:13:56,457 INFO L87 Difference]: Start difference. First operand 11165 states and 13833 transitions. Second operand has 34 states, 34 states have (on average 15.176470588235293) internal successors, (516), 33 states have internal predecessors, (516), 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) [2021-11-23 17:13:58,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:13:58,405 INFO L93 Difference]: Finished difference Result 13003 states and 16158 transitions. [2021-11-23 17:13:58,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:13:58,406 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.176470588235293) internal successors, (516), 33 states have internal predecessors, (516), 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 160 [2021-11-23 17:13:58,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:13:58,426 INFO L225 Difference]: With dead ends: 13003 [2021-11-23 17:13:58,426 INFO L226 Difference]: Without dead ends: 11285 [2021-11-23 17:13:58,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 926 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=246, Invalid=1646, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:13:58,430 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 125 mSDsluCounter, 2037 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 2152 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 212 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:13:58,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 2152 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 95 Invalid, 0 Unknown, 212 Unchecked, 0.1s Time] [2021-11-23 17:13:58,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11285 states. [2021-11-23 17:14:00,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11285 to 11129. [2021-11-23 17:14:00,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11129 states, 11128 states have (on average 1.2393062544931703) internal successors, (13791), 11128 states have internal predecessors, (13791), 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) [2021-11-23 17:14:00,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11129 states to 11129 states and 13791 transitions. [2021-11-23 17:14:00,120 INFO L78 Accepts]: Start accepts. Automaton has 11129 states and 13791 transitions. Word has length 160 [2021-11-23 17:14:00,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:00,120 INFO L470 AbstractCegarLoop]: Abstraction has 11129 states and 13791 transitions. [2021-11-23 17:14:00,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.176470588235293) internal successors, (516), 33 states have internal predecessors, (516), 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) [2021-11-23 17:14:00,120 INFO L276 IsEmpty]: Start isEmpty. Operand 11129 states and 13791 transitions. [2021-11-23 17:14:00,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:14:00,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:00,127 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:00,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (122)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:00,348 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Ended with exit code 0 [2021-11-23 17:14:00,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (123)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:00,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:00,728 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:00,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:00,728 INFO L85 PathProgramCache]: Analyzing trace with hash -1127556497, now seen corresponding path program 1 times [2021-11-23 17:14:00,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:00,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2001219515] [2021-11-23 17:14:00,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:00,729 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:00,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:00,730 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:00,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (125)] Waiting until timeout for monitored process [2021-11-23 17:14:00,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:00,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:14:00,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:03,702 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:03,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:04,394 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:04,394 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:04,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2001219515] [2021-11-23 17:14:04,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2001219515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:04,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1024489445] [2021-11-23 17:14:04,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:04,394 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:04,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:14:04,395 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:14:04,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (126)] Waiting until timeout for monitored process [2021-11-23 17:14:04,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:04,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:14:04,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:07,358 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:07,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:07,878 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:14:07,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1024489445] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:07,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1517157258] [2021-11-23 17:14:07,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:07,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:14:07,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:07,885 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:14:07,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Waiting until timeout for monitored process [2021-11-23 17:14:08,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:08,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:14:08,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:10,595 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 94 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:14:10,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:11,594 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 94 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:14:11,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1517157258] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:11,595 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:14:11,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:14:11,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069648421] [2021-11-23 17:14:11,595 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:14:11,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:14:11,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:11,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:14:11,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:14:11,597 INFO L87 Difference]: Start difference. First operand 11129 states and 13791 transitions. Second operand has 34 states, 34 states have (on average 15.5) internal successors, (527), 33 states have internal predecessors, (527), 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) [2021-11-23 17:14:13,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:13,663 INFO L93 Difference]: Finished difference Result 13159 states and 16396 transitions. [2021-11-23 17:14:13,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:14:13,663 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.5) internal successors, (527), 33 states have internal predecessors, (527), 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 160 [2021-11-23 17:14:13,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:13,676 INFO L225 Difference]: With dead ends: 13159 [2021-11-23 17:14:13,676 INFO L226 Difference]: Without dead ends: 11445 [2021-11-23 17:14:13,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 926 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=248, Invalid=1644, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:14:13,681 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 185 mSDsluCounter, 1587 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 1706 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 213 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:13,681 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [185 Valid, 1706 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 84 Invalid, 0 Unknown, 213 Unchecked, 0.1s Time] [2021-11-23 17:14:13,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11445 states. [2021-11-23 17:14:15,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11445 to 11317. [2021-11-23 17:14:15,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11317 states, 11316 states have (on average 1.2406327324142807) internal successors, (14039), 11316 states have internal predecessors, (14039), 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) [2021-11-23 17:14:15,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11317 states to 11317 states and 14039 transitions. [2021-11-23 17:14:15,294 INFO L78 Accepts]: Start accepts. Automaton has 11317 states and 14039 transitions. Word has length 160 [2021-11-23 17:14:15,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:15,294 INFO L470 AbstractCegarLoop]: Abstraction has 11317 states and 14039 transitions. [2021-11-23 17:14:15,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.5) internal successors, (527), 33 states have internal predecessors, (527), 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) [2021-11-23 17:14:15,295 INFO L276 IsEmpty]: Start isEmpty. Operand 11317 states and 14039 transitions. [2021-11-23 17:14:15,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:14:15,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:15,300 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:15,308 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (125)] Ended with exit code 0 [2021-11-23 17:14:15,525 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Ended with exit code 0 [2021-11-23 17:14:15,705 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (126)] Ended with exit code 0 [2021-11-23 17:14:15,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:15,903 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:15,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:15,904 INFO L85 PathProgramCache]: Analyzing trace with hash -1364488337, now seen corresponding path program 1 times [2021-11-23 17:14:15,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:15,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [444566961] [2021-11-23 17:14:15,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:15,904 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:15,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:15,906 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:15,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (128)] Waiting until timeout for monitored process [2021-11-23 17:14:16,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:16,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:14:16,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:17,085 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 17:14:17,085 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:17,085 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:17,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [444566961] [2021-11-23 17:14:17,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [444566961] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:17,085 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:17,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:14:17,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308762030] [2021-11-23 17:14:17,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:17,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:14:17,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:17,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:14:17,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:14:17,087 INFO L87 Difference]: Start difference. First operand 11317 states and 14039 transitions. Second operand has 5 states, 5 states have (on average 24.8) internal successors, (124), 4 states have internal predecessors, (124), 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) [2021-11-23 17:14:19,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:19,929 INFO L93 Difference]: Finished difference Result 21081 states and 26445 transitions. [2021-11-23 17:14:19,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:14:19,929 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 24.8) internal successors, (124), 4 states have internal predecessors, (124), 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 160 [2021-11-23 17:14:19,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:19,955 INFO L225 Difference]: With dead ends: 21081 [2021-11-23 17:14:19,955 INFO L226 Difference]: Without dead ends: 19103 [2021-11-23 17:14:19,960 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:14:19,961 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 83 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:19,961 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 265 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 47 Unchecked, 0.0s Time] [2021-11-23 17:14:19,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19103 states. [2021-11-23 17:14:22,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19103 to 18893. [2021-11-23 17:14:22,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18893 states, 18892 states have (on average 1.2474592420071988) internal successors, (23567), 18892 states have internal predecessors, (23567), 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) [2021-11-23 17:14:22,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18893 states to 18893 states and 23567 transitions. [2021-11-23 17:14:22,733 INFO L78 Accepts]: Start accepts. Automaton has 18893 states and 23567 transitions. Word has length 160 [2021-11-23 17:14:22,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:22,734 INFO L470 AbstractCegarLoop]: Abstraction has 18893 states and 23567 transitions. [2021-11-23 17:14:22,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 24.8) internal successors, (124), 4 states have internal predecessors, (124), 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) [2021-11-23 17:14:22,734 INFO L276 IsEmpty]: Start isEmpty. Operand 18893 states and 23567 transitions. [2021-11-23 17:14:22,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:14:22,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:22,742 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:22,751 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (128)] Ended with exit code 0 [2021-11-23 17:14:22,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:22,943 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:22,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:22,943 INFO L85 PathProgramCache]: Analyzing trace with hash -1011792918, now seen corresponding path program 1 times [2021-11-23 17:14:22,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:22,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [21255586] [2021-11-23 17:14:22,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:22,944 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:22,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:22,945 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:22,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Waiting until timeout for monitored process [2021-11-23 17:14:23,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:23,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:14:23,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:24,332 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 22 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-23 17:14:24,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:25,065 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 22 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-23 17:14:25,065 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:25,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [21255586] [2021-11-23 17:14:25,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [21255586] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:25,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [421996112] [2021-11-23 17:14:25,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:25,066 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:25,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:14:25,067 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:14:25,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Waiting until timeout for monitored process [2021-11-23 17:14:25,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:25,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:14:25,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:26,691 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 22 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-23 17:14:26,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:27,336 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 22 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-23 17:14:27,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [421996112] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:27,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103702304] [2021-11-23 17:14:27,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:27,337 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:14:27,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:27,338 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:14:27,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2021-11-23 17:14:27,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:27,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:14:27,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:28,858 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 22 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-23 17:14:28,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:29,673 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 47 proven. 22 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-23 17:14:29,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103702304] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:29,673 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:14:29,673 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:14:29,674 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501975717] [2021-11-23 17:14:29,674 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:14:29,674 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:14:29,674 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:29,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:14:29,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:14:29,675 INFO L87 Difference]: Start difference. First operand 18893 states and 23567 transitions. Second operand has 16 states, 16 states have (on average 14.0) internal successors, (224), 15 states have internal predecessors, (224), 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) [2021-11-23 17:14:33,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:33,411 INFO L93 Difference]: Finished difference Result 26721 states and 33488 transitions. [2021-11-23 17:14:33,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:14:33,412 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 14.0) internal successors, (224), 15 states have internal predecessors, (224), 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 160 [2021-11-23 17:14:33,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:33,439 INFO L225 Difference]: With dead ends: 26721 [2021-11-23 17:14:33,439 INFO L226 Difference]: Without dead ends: 23013 [2021-11-23 17:14:33,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 963 GetRequests, 941 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:14:33,446 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 181 mSDsluCounter, 1032 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 1153 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 205 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:33,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 1153 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 74 Invalid, 0 Unknown, 205 Unchecked, 0.1s Time] [2021-11-23 17:14:33,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23013 states. [2021-11-23 17:14:36,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23013 to 22757. [2021-11-23 17:14:36,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22757 states, 22756 states have (on average 1.2475391105642468) internal successors, (28389), 22756 states have internal predecessors, (28389), 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) [2021-11-23 17:14:36,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22757 states to 22757 states and 28389 transitions. [2021-11-23 17:14:36,582 INFO L78 Accepts]: Start accepts. Automaton has 22757 states and 28389 transitions. Word has length 160 [2021-11-23 17:14:36,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:36,583 INFO L470 AbstractCegarLoop]: Abstraction has 22757 states and 28389 transitions. [2021-11-23 17:14:36,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 14.0) internal successors, (224), 15 states have internal predecessors, (224), 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) [2021-11-23 17:14:36,583 INFO L276 IsEmpty]: Start isEmpty. Operand 22757 states and 28389 transitions. [2021-11-23 17:14:36,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:14:36,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:36,591 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:36,613 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Ended with exit code 0 [2021-11-23 17:14:36,801 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Ended with exit code 0 [2021-11-23 17:14:36,997 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Ended with exit code 0 [2021-11-23 17:14:37,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:37,195 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:37,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:37,195 INFO L85 PathProgramCache]: Analyzing trace with hash -943455340, now seen corresponding path program 1 times [2021-11-23 17:14:37,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:37,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [244944] [2021-11-23 17:14:37,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:37,196 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:37,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:37,197 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:37,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Waiting until timeout for monitored process [2021-11-23 17:14:37,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:37,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:14:37,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:38,133 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 74 proven. 0 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-23 17:14:38,133 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:38,133 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:38,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [244944] [2021-11-23 17:14:38,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [244944] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:38,133 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:38,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:14:38,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605742309] [2021-11-23 17:14:38,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:38,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:14:38,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:38,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:14:38,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:14:38,134 INFO L87 Difference]: Start difference. First operand 22757 states and 28389 transitions. Second operand has 5 states, 5 states have (on average 26.4) internal successors, (132), 4 states have internal predecessors, (132), 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) [2021-11-23 17:14:44,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:44,033 INFO L93 Difference]: Finished difference Result 45743 states and 57389 transitions. [2021-11-23 17:14:44,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:14:44,034 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 4 states have internal predecessors, (132), 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 160 [2021-11-23 17:14:44,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:44,087 INFO L225 Difference]: With dead ends: 45743 [2021-11-23 17:14:44,087 INFO L226 Difference]: Without dead ends: 41401 [2021-11-23 17:14:44,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:14:44,096 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 132 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:44,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 255 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 60 Unchecked, 0.0s Time] [2021-11-23 17:14:44,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41401 states. [2021-11-23 17:14:50,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41401 to 41075. [2021-11-23 17:14:50,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41075 states, 41074 states have (on average 1.24684715391732) internal successors, (51213), 41074 states have internal predecessors, (51213), 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) [2021-11-23 17:14:50,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41075 states to 41075 states and 51213 transitions. [2021-11-23 17:14:50,353 INFO L78 Accepts]: Start accepts. Automaton has 41075 states and 51213 transitions. Word has length 160 [2021-11-23 17:14:50,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:50,353 INFO L470 AbstractCegarLoop]: Abstraction has 41075 states and 51213 transitions. [2021-11-23 17:14:50,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 26.4) internal successors, (132), 4 states have internal predecessors, (132), 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) [2021-11-23 17:14:50,353 INFO L276 IsEmpty]: Start isEmpty. Operand 41075 states and 51213 transitions. [2021-11-23 17:14:50,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-23 17:14:50,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:50,463 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:50,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:50,672 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:14:50,672 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:50,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:50,673 INFO L85 PathProgramCache]: Analyzing trace with hash -2028192590, now seen corresponding path program 1 times [2021-11-23 17:14:50,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:50,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1832099483] [2021-11-23 17:14:50,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:50,673 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:50,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:50,674 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:50,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (133)] Waiting until timeout for monitored process [2021-11-23 17:14:50,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:50,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:14:50,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:52,467 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 39 proven. 59 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:14:52,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:52,912 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 39 proven. 59 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:14:52,912 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:52,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1832099483] [2021-11-23 17:14:52,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1832099483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:52,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [142025617] [2021-11-23 17:14:52,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:52,913 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:52,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:14:52,914 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:14:52,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (134)] Waiting until timeout for monitored process [2021-11-23 17:14:53,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:53,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:14:53,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:54,766 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 39 proven. 59 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:14:54,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:55,182 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 39 proven. 59 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:14:55,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [142025617] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:55,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543506552] [2021-11-23 17:14:55,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:55,182 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:14:55,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:55,183 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:14:55,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Waiting until timeout for monitored process [2021-11-23 17:14:55,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:55,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:14:55,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:57,040 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 39 proven. 59 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:14:57,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:57,456 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 39 proven. 59 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:14:57,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [543506552] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:57,456 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:14:57,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:14:57,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882089989] [2021-11-23 17:14:57,457 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:14:57,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:14:57,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:57,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:14:57,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:14:57,458 INFO L87 Difference]: Start difference. First operand 41075 states and 51213 transitions. Second operand has 16 states, 16 states have (on average 16.875) internal successors, (270), 15 states have internal predecessors, (270), 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) [2021-11-23 17:15:06,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:06,314 INFO L93 Difference]: Finished difference Result 74355 states and 93015 transitions. [2021-11-23 17:15:06,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 17:15:06,315 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 16.875) internal successors, (270), 15 states have internal predecessors, (270), 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 161 [2021-11-23 17:15:06,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:06,407 INFO L225 Difference]: With dead ends: 74355 [2021-11-23 17:15:06,407 INFO L226 Difference]: Without dead ends: 60321 [2021-11-23 17:15:06,429 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 950 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=763, Unknown=0, NotChecked=0, Total=930 [2021-11-23 17:15:06,430 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 370 mSDsluCounter, 1039 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 1211 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 216 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:06,430 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [370 Valid, 1211 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 121 Invalid, 0 Unknown, 216 Unchecked, 0.1s Time] [2021-11-23 17:15:06,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60321 states. [2021-11-23 17:15:14,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60321 to 48017. [2021-11-23 17:15:14,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48017 states, 48016 states have (on average 1.2405656447850717) internal successors, (59567), 48016 states have internal predecessors, (59567), 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) [2021-11-23 17:15:14,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48017 states to 48017 states and 59567 transitions. [2021-11-23 17:15:14,463 INFO L78 Accepts]: Start accepts. Automaton has 48017 states and 59567 transitions. Word has length 161 [2021-11-23 17:15:14,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:14,464 INFO L470 AbstractCegarLoop]: Abstraction has 48017 states and 59567 transitions. [2021-11-23 17:15:14,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 16.875) internal successors, (270), 15 states have internal predecessors, (270), 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) [2021-11-23 17:15:14,464 INFO L276 IsEmpty]: Start isEmpty. Operand 48017 states and 59567 transitions. [2021-11-23 17:15:14,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-23 17:15:14,472 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:14,472 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:14,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (134)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:14,681 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (133)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:14,896 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Ended with exit code 0 [2021-11-23 17:15:15,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:15,073 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:15,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:15,074 INFO L85 PathProgramCache]: Analyzing trace with hash 23863499, now seen corresponding path program 1 times [2021-11-23 17:15:15,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:15,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1784340720] [2021-11-23 17:15:15,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:15,075 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:15,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:15,076 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:15,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (136)] Waiting until timeout for monitored process [2021-11-23 17:15:15,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:15,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:15:15,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:18,007 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 13 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:18,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:18,748 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 13 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:18,748 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:18,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1784340720] [2021-11-23 17:15:18,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1784340720] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:18,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1093555724] [2021-11-23 17:15:18,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:18,749 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:18,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:18,749 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:18,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (137)] Waiting until timeout for monitored process [2021-11-23 17:15:19,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:19,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:15:19,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:21,771 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 13 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:21,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:22,332 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 13 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:22,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1093555724] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:22,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667209926] [2021-11-23 17:15:22,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:22,333 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:22,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:22,333 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:22,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Waiting until timeout for monitored process [2021-11-23 17:15:22,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:22,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:15:22,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:24,485 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 13 proven. 101 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:15:24,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:25,363 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 13 proven. 101 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:15:25,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667209926] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:25,363 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:25,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:15:25,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995450882] [2021-11-23 17:15:25,364 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:25,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:15:25,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:25,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:15:25,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:15:25,365 INFO L87 Difference]: Start difference. First operand 48017 states and 59567 transitions. Second operand has 34 states, 34 states have (on average 15.794117647058824) internal successors, (537), 33 states have internal predecessors, (537), 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) [2021-11-23 17:15:32,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:32,392 INFO L93 Difference]: Finished difference Result 55499 states and 68896 transitions. [2021-11-23 17:15:32,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:15:32,393 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.794117647058824) internal successors, (537), 33 states have internal predecessors, (537), 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 161 [2021-11-23 17:15:32,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:32,456 INFO L225 Difference]: With dead ends: 55499 [2021-11-23 17:15:32,456 INFO L226 Difference]: Without dead ends: 48321 [2021-11-23 17:15:32,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 973 GetRequests, 931 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=252, Invalid=1640, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:15:32,471 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 167 mSDsluCounter, 2033 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 2157 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 194 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:32,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 2157 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 81 Invalid, 0 Unknown, 194 Unchecked, 0.1s Time] [2021-11-23 17:15:32,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48321 states. [2021-11-23 17:15:39,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48321 to 48321. [2021-11-23 17:15:40,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48321 states, 48320 states have (on average 1.2387210264900663) internal successors, (59855), 48320 states have internal predecessors, (59855), 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) [2021-11-23 17:15:40,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48321 states to 48321 states and 59855 transitions. [2021-11-23 17:15:40,097 INFO L78 Accepts]: Start accepts. Automaton has 48321 states and 59855 transitions. Word has length 161 [2021-11-23 17:15:40,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:40,097 INFO L470 AbstractCegarLoop]: Abstraction has 48321 states and 59855 transitions. [2021-11-23 17:15:40,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.794117647058824) internal successors, (537), 33 states have internal predecessors, (537), 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) [2021-11-23 17:15:40,098 INFO L276 IsEmpty]: Start isEmpty. Operand 48321 states and 59855 transitions. [2021-11-23 17:15:40,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-23 17:15:40,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:40,106 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:40,131 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Ended with exit code 0 [2021-11-23 17:15:40,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (136)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:40,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (137)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:40,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:40,707 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:40,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:40,707 INFO L85 PathProgramCache]: Analyzing trace with hash 2045450612, now seen corresponding path program 1 times [2021-11-23 17:15:40,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:40,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1331359888] [2021-11-23 17:15:40,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:40,708 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:40,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:40,709 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:40,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (139)] Waiting until timeout for monitored process [2021-11-23 17:15:40,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:40,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:40,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:42,449 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 63 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 17:15:42,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:43,107 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 63 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 17:15:43,107 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:43,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1331359888] [2021-11-23 17:15:43,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1331359888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:43,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1321907443] [2021-11-23 17:15:43,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:43,108 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:43,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:43,109 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:43,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (140)] Waiting until timeout for monitored process [2021-11-23 17:15:43,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:43,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:43,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:45,019 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 63 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 17:15:45,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:45,534 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 63 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 17:15:45,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1321907443] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:45,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074814905] [2021-11-23 17:15:45,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:45,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:45,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:45,535 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:45,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2c23260-c82c-4687-b5be-9dc33bc94e9d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Waiting until timeout for monitored process [2021-11-23 17:15:45,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:45,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:45,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:47,259 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 63 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 17:15:47,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:47,849 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 21 proven. 63 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 17:15:47,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2074814905] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:47,850 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:47,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:15:47,850 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965071416] [2021-11-23 17:15:47,850 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:47,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:15:47,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:47,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:15:47,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:15:47,851 INFO L87 Difference]: Start difference. First operand 48321 states and 59855 transitions. Second operand has 16 states, 16 states have (on average 16.375) internal successors, (262), 15 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) [2021-11-23 17:15:55,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:55,266 INFO L93 Difference]: Finished difference Result 66379 states and 82332 transitions. [2021-11-23 17:15:55,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:15:55,267 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 16.375) internal successors, (262), 15 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 161 [2021-11-23 17:15:55,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:55,336 INFO L225 Difference]: With dead ends: 66379 [2021-11-23 17:15:55,337 INFO L226 Difference]: Without dead ends: 51737 [2021-11-23 17:15:55,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 970 GetRequests, 948 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:15:55,353 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 177 mSDsluCounter, 922 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 1048 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:55,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 1048 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 86 Invalid, 0 Unknown, 114 Unchecked, 0.1s Time] [2021-11-23 17:15:55,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51737 states.