./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_6.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_6.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e0e55420715ff80c27c9ff14eb8ac6a520210206e33b4fd081fea4bf1c2e05be --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 07:40:49,774 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 07:40:49,778 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 07:40:49,838 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 07:40:49,839 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 07:40:49,845 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 07:40:49,848 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 07:40:49,853 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 07:40:49,857 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 07:40:49,867 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 07:40:49,869 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 07:40:49,870 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 07:40:49,872 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 07:40:49,876 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 07:40:49,880 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 07:40:49,887 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 07:40:49,891 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 07:40:49,892 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 07:40:49,898 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 07:40:49,904 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 07:40:49,909 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 07:40:49,911 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 07:40:49,916 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 07:40:49,918 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 07:40:49,927 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 07:40:49,927 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 07:40:49,928 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 07:40:49,931 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 07:40:49,932 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 07:40:49,934 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 07:40:49,935 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 07:40:49,936 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 07:40:49,939 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 07:40:49,941 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 07:40:49,943 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 07:40:49,943 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 07:40:49,944 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 07:40:49,945 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 07:40:49,945 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 07:40:49,946 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 07:40:49,947 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 07:40:49,948 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-07 07:40:50,013 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 07:40:50,014 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 07:40:50,014 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-07 07:40:50,015 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-07 07:40:50,025 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-07 07:40:50,025 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-07 07:40:50,025 INFO L138 SettingsManager]: * Use SBE=true [2021-11-07 07:40:50,026 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 07:40:50,026 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 07:40:50,026 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 07:40:50,028 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 07:40:50,028 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 07:40:50,028 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 07:40:50,029 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 07:40:50,029 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 07:40:50,029 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 07:40:50,030 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 07:40:50,030 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 07:40:50,030 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 07:40:50,031 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 07:40:50,031 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 07:40:50,031 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 07:40:50,032 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 07:40:50,032 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 07:40:50,032 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 07:40:50,033 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 07:40:50,033 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-07 07:40:50,033 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 07:40:50,033 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-07 07:40:50,035 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-07 07:40:50,036 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 07:40:50,036 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 07:40:50,037 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e0e55420715ff80c27c9ff14eb8ac6a520210206e33b4fd081fea4bf1c2e05be [2021-11-07 07:40:50,370 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 07:40:50,395 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 07:40:50,398 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 07:40:50,400 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 07:40:50,401 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 07:40:50,402 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/../../sv-benchmarks/c/loop-simple/nested_6.c [2021-11-07 07:40:50,482 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/data/cf19d993e/056d9359db1d4f85b87a0b187a14092c/FLAG5913303cd [2021-11-07 07:40:51,026 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 07:40:51,027 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/sv-benchmarks/c/loop-simple/nested_6.c [2021-11-07 07:40:51,035 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/data/cf19d993e/056d9359db1d4f85b87a0b187a14092c/FLAG5913303cd [2021-11-07 07:40:51,379 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/data/cf19d993e/056d9359db1d4f85b87a0b187a14092c [2021-11-07 07:40:51,383 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 07:40:51,384 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 07:40:51,390 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 07:40:51,391 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 07:40:51,395 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 07:40:51,396 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,398 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e39760 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51, skipping insertion in model container [2021-11-07 07:40:51,398 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,407 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 07:40:51,427 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 07:40:51,664 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/sv-benchmarks/c/loop-simple/nested_6.c[959,972] [2021-11-07 07:40:51,670 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 07:40:51,681 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 07:40:51,701 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/sv-benchmarks/c/loop-simple/nested_6.c[959,972] [2021-11-07 07:40:51,702 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 07:40:51,719 INFO L208 MainTranslator]: Completed translation [2021-11-07 07:40:51,719 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51 WrapperNode [2021-11-07 07:40:51,719 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 07:40:51,721 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 07:40:51,721 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 07:40:51,721 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 07:40:51,731 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,739 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,762 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 07:40:51,763 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 07:40:51,763 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 07:40:51,763 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 07:40:51,773 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,774 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,776 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,776 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,781 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,787 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,789 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,791 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 07:40:51,792 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 07:40:51,793 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 07:40:51,793 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 07:40:51,794 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (1/1) ... [2021-11-07 07:40:51,811 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 07:40:51,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:40:51,856 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 07:40:51,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 07:40:51,897 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 07:40:51,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 07:40:51,897 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 07:40:51,897 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 07:40:52,135 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 07:40:52,135 INFO L299 CfgBuilder]: Removed 10 assume(true) statements. [2021-11-07 07:40:52,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 07:40:52 BoogieIcfgContainer [2021-11-07 07:40:52,137 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 07:40:52,140 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 07:40:52,140 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 07:40:52,144 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 07:40:52,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 07:40:51" (1/3) ... [2021-11-07 07:40:52,146 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25ddd4eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 07:40:52, skipping insertion in model container [2021-11-07 07:40:52,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:40:51" (2/3) ... [2021-11-07 07:40:52,147 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25ddd4eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 07:40:52, skipping insertion in model container [2021-11-07 07:40:52,147 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 07:40:52" (3/3) ... [2021-11-07 07:40:52,150 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_6.c [2021-11-07 07:40:52,156 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 07:40:52,157 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 07:40:52,217 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 07:40:52,226 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=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 07:40:52,226 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 07:40:52,244 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 19 states have (on average 1.736842105263158) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-07 07:40:52,249 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:52,250 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-07 07:40:52,251 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:52,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:52,258 INFO L85 PathProgramCache]: Analyzing trace with hash 28698918, now seen corresponding path program 1 times [2021-11-07 07:40:52,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:52,270 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523984589] [2021-11-07 07:40:52,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:52,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:52,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:52,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:40:52,472 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:52,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523984589] [2021-11-07 07:40:52,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [523984589] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:40:52,474 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:40:52,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 07:40:52,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689841424] [2021-11-07 07:40:52,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 07:40:52,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:52,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 07:40:52,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:52,501 INFO L87 Difference]: Start difference. First operand has 21 states, 19 states have (on average 1.736842105263158) internal successors, (33), 20 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:52,563 INFO L93 Difference]: Finished difference Result 52 states and 88 transitions. [2021-11-07 07:40:52,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 07:40:52,565 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-07 07:40:52,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:52,575 INFO L225 Difference]: With dead ends: 52 [2021-11-07 07:40:52,576 INFO L226 Difference]: Without dead ends: 29 [2021-11-07 07:40:52,579 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:52,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-07 07:40:52,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 18. [2021-11-07 07:40:52,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 17 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 23 transitions. [2021-11-07 07:40:52,619 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 23 transitions. Word has length 5 [2021-11-07 07:40:52,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:52,620 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 23 transitions. [2021-11-07 07:40:52,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,620 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 23 transitions. [2021-11-07 07:40:52,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-07 07:40:52,621 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:52,622 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:40:52,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 07:40:52,623 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:52,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:52,624 INFO L85 PathProgramCache]: Analyzing trace with hash 270775882, now seen corresponding path program 1 times [2021-11-07 07:40:52,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:52,625 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719347446] [2021-11-07 07:40:52,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:52,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:52,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:52,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:40:52,685 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:52,686 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719347446] [2021-11-07 07:40:52,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719347446] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:40:52,686 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:40:52,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 07:40:52,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367307003] [2021-11-07 07:40:52,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 07:40:52,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:52,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 07:40:52,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:52,691 INFO L87 Difference]: Start difference. First operand 18 states and 23 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:52,713 INFO L93 Difference]: Finished difference Result 43 states and 58 transitions. [2021-11-07 07:40:52,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 07:40:52,714 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-07 07:40:52,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:52,715 INFO L225 Difference]: With dead ends: 43 [2021-11-07 07:40:52,716 INFO L226 Difference]: Without dead ends: 28 [2021-11-07 07:40:52,717 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:52,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-07 07:40:52,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 19. [2021-11-07 07:40:52,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2021-11-07 07:40:52,723 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 8 [2021-11-07 07:40:52,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:52,724 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2021-11-07 07:40:52,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,725 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2021-11-07 07:40:52,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 07:40:52,726 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:52,726 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:40:52,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 07:40:52,727 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:52,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:52,728 INFO L85 PathProgramCache]: Analyzing trace with hash 1936160826, now seen corresponding path program 1 times [2021-11-07 07:40:52,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:52,729 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404283428] [2021-11-07 07:40:52,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:52,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:52,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:52,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:40:52,794 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:52,794 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404283428] [2021-11-07 07:40:52,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404283428] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:40:52,795 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:40:52,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 07:40:52,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580679581] [2021-11-07 07:40:52,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 07:40:52,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:52,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 07:40:52,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:52,799 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:52,824 INFO L93 Difference]: Finished difference Result 43 states and 57 transitions. [2021-11-07 07:40:52,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 07:40:52,825 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-07 07:40:52,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:52,828 INFO L225 Difference]: With dead ends: 43 [2021-11-07 07:40:52,829 INFO L226 Difference]: Without dead ends: 27 [2021-11-07 07:40:52,830 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:52,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-07 07:40:52,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 20. [2021-11-07 07:40:52,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 19 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2021-11-07 07:40:52,842 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 11 [2021-11-07 07:40:52,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:52,843 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2021-11-07 07:40:52,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,844 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2021-11-07 07:40:52,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-07 07:40:52,846 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:52,846 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:40:52,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 07:40:52,847 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:52,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:52,851 INFO L85 PathProgramCache]: Analyzing trace with hash -1227454858, now seen corresponding path program 1 times [2021-11-07 07:40:52,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:52,852 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404656769] [2021-11-07 07:40:52,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:52,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:52,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:52,925 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:40:52,926 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:52,926 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404656769] [2021-11-07 07:40:52,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404656769] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:40:52,927 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:40:52,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 07:40:52,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578182147] [2021-11-07 07:40:52,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 07:40:52,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:52,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 07:40:52,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:52,931 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:52,951 INFO L93 Difference]: Finished difference Result 43 states and 56 transitions. [2021-11-07 07:40:52,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 07:40:52,952 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-07 07:40:52,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:52,954 INFO L225 Difference]: With dead ends: 43 [2021-11-07 07:40:52,954 INFO L226 Difference]: Without dead ends: 26 [2021-11-07 07:40:52,963 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:52,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-07 07:40:52,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 21. [2021-11-07 07:40:52,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-11-07 07:40:52,970 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 14 [2021-11-07 07:40:52,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:52,971 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-11-07 07:40:52,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:52,972 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-11-07 07:40:52,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-07 07:40:52,973 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:52,973 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:40:52,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 07:40:52,974 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:52,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:52,975 INFO L85 PathProgramCache]: Analyzing trace with hash -1691120258, now seen corresponding path program 1 times [2021-11-07 07:40:52,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:52,976 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747978669] [2021-11-07 07:40:52,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:52,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:53,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:53,092 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:40:53,092 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:53,093 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747978669] [2021-11-07 07:40:53,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747978669] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:40:53,094 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:40:53,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 07:40:53,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357962469] [2021-11-07 07:40:53,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 07:40:53,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:53,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 07:40:53,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:53,101 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:53,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:53,143 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2021-11-07 07:40:53,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 07:40:53,144 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-07 07:40:53,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:53,145 INFO L225 Difference]: With dead ends: 43 [2021-11-07 07:40:53,145 INFO L226 Difference]: Without dead ends: 25 [2021-11-07 07:40:53,146 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:53,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-07 07:40:53,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2021-11-07 07:40:53,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:53,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-07 07:40:53,153 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 17 [2021-11-07 07:40:53,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:53,153 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-07 07:40:53,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:53,154 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-07 07:40:53,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-07 07:40:53,155 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:53,155 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:40:53,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 07:40:53,156 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:53,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:53,157 INFO L85 PathProgramCache]: Analyzing trace with hash -1077656366, now seen corresponding path program 1 times [2021-11-07 07:40:53,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:53,158 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390893371] [2021-11-07 07:40:53,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:53,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:53,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:53,239 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:40:53,242 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:53,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390893371] [2021-11-07 07:40:53,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1390893371] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:40:53,242 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:40:53,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 07:40:53,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938592274] [2021-11-07 07:40:53,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 07:40:53,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:53,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 07:40:53,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:53,246 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:53,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:53,263 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2021-11-07 07:40:53,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 07:40:53,264 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-07 07:40:53,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:53,265 INFO L225 Difference]: With dead ends: 43 [2021-11-07 07:40:53,265 INFO L226 Difference]: Without dead ends: 24 [2021-11-07 07:40:53,266 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 07:40:53,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-07 07:40:53,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-11-07 07:40:53,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:53,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-11-07 07:40:53,272 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 20 [2021-11-07 07:40:53,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:53,272 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-11-07 07:40:53,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:53,273 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-11-07 07:40:53,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-07 07:40:53,274 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:53,274 INFO L513 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] [2021-11-07 07:40:53,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 07:40:53,275 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:53,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:53,276 INFO L85 PathProgramCache]: Analyzing trace with hash -624839792, now seen corresponding path program 1 times [2021-11-07 07:40:53,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:53,276 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179382873] [2021-11-07 07:40:53,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:53,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:53,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:53,355 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:40:53,356 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:53,356 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179382873] [2021-11-07 07:40:53,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179382873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:53,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117638924] [2021-11-07 07:40:53,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:53,358 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:40:53,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:40:53,360 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:40:53,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 07:40:53,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:53,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 07:40:53,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:40:53,608 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:40:53,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117638924] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:53,609 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:40:53,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-11-07 07:40:53,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859417974] [2021-11-07 07:40:53,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 07:40:53,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:53,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 07:40:53,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-07 07:40:53,611 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:53,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:53,637 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2021-11-07 07:40:53,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 07:40:53,638 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-07 07:40:53,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:53,639 INFO L225 Difference]: With dead ends: 46 [2021-11-07 07:40:53,639 INFO L226 Difference]: Without dead ends: 26 [2021-11-07 07:40:53,640 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-07 07:40:53,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-07 07:40:53,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-11-07 07:40:53,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:53,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-11-07 07:40:53,646 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 22 [2021-11-07 07:40:53,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:53,646 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-11-07 07:40:53,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:53,647 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-11-07 07:40:53,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-07 07:40:53,648 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:53,648 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:40:53,740 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-07 07:40:53,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:40:53,866 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:53,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:53,867 INFO L85 PathProgramCache]: Analyzing trace with hash 740190926, now seen corresponding path program 2 times [2021-11-07 07:40:53,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:53,867 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556256978] [2021-11-07 07:40:53,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:53,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:53,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:53,956 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 07:40:53,956 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:53,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556256978] [2021-11-07 07:40:53,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [556256978] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:53,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741045387] [2021-11-07 07:40:53,958 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 07:40:53,958 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:40:53,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:40:53,972 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:40:54,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 07:40:54,058 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 07:40:54,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:40:54,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 07:40:54,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:40:54,189 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:40:54,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741045387] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:54,189 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:40:54,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2021-11-07 07:40:54,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113363731] [2021-11-07 07:40:54,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 07:40:54,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:54,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 07:40:54,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-07 07:40:54,192 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:54,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:54,332 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2021-11-07 07:40:54,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 07:40:54,333 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-07 07:40:54,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:54,334 INFO L225 Difference]: With dead ends: 69 [2021-11-07 07:40:54,335 INFO L226 Difference]: Without dead ends: 47 [2021-11-07 07:40:54,336 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2021-11-07 07:40:54,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-07 07:40:54,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 36. [2021-11-07 07:40:54,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.2) internal successors, (42), 35 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:54,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-11-07 07:40:54,354 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 24 [2021-11-07 07:40:54,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:54,355 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-11-07 07:40:54,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:54,357 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-11-07 07:40:54,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-07 07:40:54,361 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:54,362 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:40:54,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-07 07:40:54,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:40:54,563 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:54,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:54,564 INFO L85 PathProgramCache]: Analyzing trace with hash -2072224450, now seen corresponding path program 3 times [2021-11-07 07:40:54,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:54,564 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130309021] [2021-11-07 07:40:54,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:54,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:54,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:54,634 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-07 07:40:54,634 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:54,635 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130309021] [2021-11-07 07:40:54,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130309021] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:54,635 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256621039] [2021-11-07 07:40:54,635 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 07:40:54,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:40:54,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:40:54,639 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:40:54,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 07:40:54,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-07 07:40:54,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:40:54,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 07:40:54,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:40:54,939 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-07 07:40:54,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256621039] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:54,940 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:40:54,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-11-07 07:40:54,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224663001] [2021-11-07 07:40:54,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 07:40:54,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:54,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 07:40:54,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 07:40:54,948 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 6 states, 6 states have (on average 6.833333333333333) internal successors, (41), 6 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:55,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:55,056 INFO L93 Difference]: Finished difference Result 251 states and 297 transitions. [2021-11-07 07:40:55,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 07:40:55,057 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.833333333333333) internal successors, (41), 6 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-07 07:40:55,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:55,060 INFO L225 Difference]: With dead ends: 251 [2021-11-07 07:40:55,060 INFO L226 Difference]: Without dead ends: 218 [2021-11-07 07:40:55,061 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 07:40:55,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-11-07 07:40:55,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 108. [2021-11-07 07:40:55,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 107 states have (on average 1.1775700934579438) internal successors, (126), 107 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:55,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 126 transitions. [2021-11-07 07:40:55,083 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 126 transitions. Word has length 35 [2021-11-07 07:40:55,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:55,084 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 126 transitions. [2021-11-07 07:40:55,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.833333333333333) internal successors, (41), 6 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:55,084 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 126 transitions. [2021-11-07 07:40:55,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-07 07:40:55,089 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:55,090 INFO L513 BasicCegarLoop]: trace histogram [24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:40:55,134 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-07 07:40:55,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:40:55,303 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:55,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:55,304 INFO L85 PathProgramCache]: Analyzing trace with hash 1027204902, now seen corresponding path program 4 times [2021-11-07 07:40:55,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:55,304 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632052577] [2021-11-07 07:40:55,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:55,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:55,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:55,420 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 475 proven. 1 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2021-11-07 07:40:55,420 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:55,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632052577] [2021-11-07 07:40:55,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632052577] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:55,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610873960] [2021-11-07 07:40:55,421 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 07:40:55,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:40:55,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:40:55,439 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:40:55,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 07:40:55,565 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 07:40:55,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:40:55,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 07:40:55,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:40:55,921 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 199 proven. 9 refuted. 0 times theorem prover too weak. 697 trivial. 0 not checked. [2021-11-07 07:40:55,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610873960] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:55,922 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:40:55,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6] total 8 [2021-11-07 07:40:55,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714422111] [2021-11-07 07:40:55,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 07:40:55,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:55,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 07:40:55,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-07 07:40:55,930 INFO L87 Difference]: Start difference. First operand 108 states and 126 transitions. Second operand has 8 states, 8 states have (on average 5.875) internal successors, (47), 8 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:56,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:56,072 INFO L93 Difference]: Finished difference Result 462 states and 552 transitions. [2021-11-07 07:40:56,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 07:40:56,073 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.875) internal successors, (47), 8 states have internal predecessors, (47), 0 states have call successors, (0), 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 107 [2021-11-07 07:40:56,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:56,079 INFO L225 Difference]: With dead ends: 462 [2021-11-07 07:40:56,080 INFO L226 Difference]: Without dead ends: 358 [2021-11-07 07:40:56,085 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=90, Invalid=150, Unknown=0, NotChecked=0, Total=240 [2021-11-07 07:40:56,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-07 07:40:56,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 230. [2021-11-07 07:40:56,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.1441048034934498) internal successors, (262), 229 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) [2021-11-07 07:40:56,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 262 transitions. [2021-11-07 07:40:56,158 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 262 transitions. Word has length 107 [2021-11-07 07:40:56,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:56,159 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 262 transitions. [2021-11-07 07:40:56,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.875) internal successors, (47), 8 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:56,159 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 262 transitions. [2021-11-07 07:40:56,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-07 07:40:56,167 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:56,167 INFO L513 BasicCegarLoop]: trace histogram [64, 64, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:40:56,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-07 07:40:56,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-07 07:40:56,391 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:56,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:56,392 INFO L85 PathProgramCache]: Analyzing trace with hash 1840482894, now seen corresponding path program 5 times [2021-11-07 07:40:56,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:56,392 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097023672] [2021-11-07 07:40:56,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:56,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:56,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:56,536 INFO L134 CoverageAnalysis]: Checked inductivity of 5698 backedges. 2904 proven. 1 refuted. 0 times theorem prover too weak. 2793 trivial. 0 not checked. [2021-11-07 07:40:56,537 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:56,537 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097023672] [2021-11-07 07:40:56,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097023672] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:56,537 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216555361] [2021-11-07 07:40:56,538 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 07:40:56,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:40:56,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:40:56,551 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:40:56,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-07 07:40:56,687 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-07 07:40:56,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:40:56,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 07:40:56,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:40:57,411 INFO L134 CoverageAnalysis]: Checked inductivity of 5698 backedges. 2646 proven. 16 refuted. 0 times theorem prover too weak. 3036 trivial. 0 not checked. [2021-11-07 07:40:57,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216555361] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:57,411 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:40:57,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7] total 9 [2021-11-07 07:40:57,412 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790644770] [2021-11-07 07:40:57,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 07:40:57,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:57,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 07:40:57,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-11-07 07:40:57,414 INFO L87 Difference]: Start difference. First operand 230 states and 262 transitions. Second operand has 9 states, 9 states have (on average 6.777777777777778) internal successors, (61), 9 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) [2021-11-07 07:40:57,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:57,677 INFO L93 Difference]: Finished difference Result 1034 states and 1208 transitions. [2021-11-07 07:40:57,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-07 07:40:57,678 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 6.777777777777778) internal successors, (61), 9 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 229 [2021-11-07 07:40:57,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:57,684 INFO L225 Difference]: With dead ends: 1034 [2021-11-07 07:40:57,684 INFO L226 Difference]: Without dead ends: 808 [2021-11-07 07:40:57,687 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2021-11-07 07:40:57,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 808 states. [2021-11-07 07:40:57,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 808 to 512. [2021-11-07 07:40:57,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 511 states have (on average 1.1232876712328768) internal successors, (574), 511 states have internal predecessors, (574), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:57,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 574 transitions. [2021-11-07 07:40:57,759 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 574 transitions. Word has length 229 [2021-11-07 07:40:57,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:57,761 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 574 transitions. [2021-11-07 07:40:57,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 6.777777777777778) internal successors, (61), 9 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) [2021-11-07 07:40:57,761 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 574 transitions. [2021-11-07 07:40:57,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2021-11-07 07:40:57,792 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:57,793 INFO L513 BasicCegarLoop]: trace histogram [160, 160, 32, 32, 32, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:40:57,839 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-07 07:40:58,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:40:58,007 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:40:58,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:40:58,008 INFO L85 PathProgramCache]: Analyzing trace with hash 856808358, now seen corresponding path program 6 times [2021-11-07 07:40:58,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:40:58,009 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413258799] [2021-11-07 07:40:58,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:40:58,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:40:58,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:40:58,300 INFO L134 CoverageAnalysis]: Checked inductivity of 33195 backedges. 1979 proven. 25 refuted. 0 times theorem prover too weak. 31191 trivial. 0 not checked. [2021-11-07 07:40:58,300 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:40:58,300 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413258799] [2021-11-07 07:40:58,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413258799] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:58,300 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972324067] [2021-11-07 07:40:58,301 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 07:40:58,301 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:40:58,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:40:58,303 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:40:58,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-07 07:40:58,552 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-11-07 07:40:58,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:40:58,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 07:40:58,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:40:59,757 INFO L134 CoverageAnalysis]: Checked inductivity of 33195 backedges. 12889 proven. 25 refuted. 0 times theorem prover too weak. 20281 trivial. 0 not checked. [2021-11-07 07:40:59,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972324067] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:40:59,758 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:40:59,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-11-07 07:40:59,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082297341] [2021-11-07 07:40:59,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 07:40:59,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:40:59,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 07:40:59,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-11-07 07:40:59,764 INFO L87 Difference]: Start difference. First operand 512 states and 574 transitions. Second operand has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:59,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:40:59,851 INFO L93 Difference]: Finished difference Result 1070 states and 1225 transitions. [2021-11-07 07:40:59,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 07:40:59,852 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 0 states have call successors, (0), 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 511 [2021-11-07 07:40:59,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:40:59,859 INFO L225 Difference]: With dead ends: 1070 [2021-11-07 07:40:59,859 INFO L226 Difference]: Without dead ends: 576 [2021-11-07 07:40:59,860 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 518 GetRequests, 511 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-11-07 07:40:59,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-11-07 07:40:59,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 576. [2021-11-07 07:40:59,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 576 states, 575 states have (on average 1.1095652173913044) internal successors, (638), 575 states have internal predecessors, (638), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:59,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 638 transitions. [2021-11-07 07:40:59,935 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 638 transitions. Word has length 511 [2021-11-07 07:40:59,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:40:59,936 INFO L470 AbstractCegarLoop]: Abstraction has 576 states and 638 transitions. [2021-11-07 07:40:59,936 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:40:59,937 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 638 transitions. [2021-11-07 07:40:59,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 576 [2021-11-07 07:40:59,953 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:40:59,954 INFO L513 BasicCegarLoop]: trace histogram [192, 192, 32, 32, 32, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:40:59,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-07 07:41:00,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:41:00,167 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:41:00,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:41:00,168 INFO L85 PathProgramCache]: Analyzing trace with hash -222729306, now seen corresponding path program 7 times [2021-11-07 07:41:00,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:41:00,168 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530080873] [2021-11-07 07:41:00,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:41:00,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:41:00,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:41:00,421 INFO L134 CoverageAnalysis]: Checked inductivity of 45451 backedges. 5336 proven. 89 refuted. 0 times theorem prover too weak. 40026 trivial. 0 not checked. [2021-11-07 07:41:00,421 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:41:00,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530080873] [2021-11-07 07:41:00,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530080873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:00,422 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040186727] [2021-11-07 07:41:00,422 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 07:41:00,422 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:41:00,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:41:00,427 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:41:00,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-07 07:41:01,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:41:01,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 994 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 07:41:01,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:41:02,341 INFO L134 CoverageAnalysis]: Checked inductivity of 45451 backedges. 5336 proven. 89 refuted. 0 times theorem prover too weak. 40026 trivial. 0 not checked. [2021-11-07 07:41:02,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1040186727] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:02,342 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:41:02,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-11-07 07:41:02,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824361665] [2021-11-07 07:41:02,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 07:41:02,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:41:02,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 07:41:02,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-07 07:41:02,346 INFO L87 Difference]: Start difference. First operand 576 states and 638 transitions. Second operand has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:02,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:41:02,464 INFO L93 Difference]: Finished difference Result 1579 states and 1748 transitions. [2021-11-07 07:41:02,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 07:41:02,465 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 0 states have call successors, (0), 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 575 [2021-11-07 07:41:02,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:41:02,472 INFO L225 Difference]: With dead ends: 1579 [2021-11-07 07:41:02,473 INFO L226 Difference]: Without dead ends: 1040 [2021-11-07 07:41:02,474 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 575 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-07 07:41:02,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1040 states. [2021-11-07 07:41:02,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1040 to 816. [2021-11-07 07:41:02,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 816 states, 815 states have (on average 1.0969325153374234) internal successors, (894), 815 states have internal predecessors, (894), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:02,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 816 states to 816 states and 894 transitions. [2021-11-07 07:41:02,552 INFO L78 Accepts]: Start accepts. Automaton has 816 states and 894 transitions. Word has length 575 [2021-11-07 07:41:02,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:41:02,554 INFO L470 AbstractCegarLoop]: Abstraction has 816 states and 894 transitions. [2021-11-07 07:41:02,554 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:02,555 INFO L276 IsEmpty]: Start isEmpty. Operand 816 states and 894 transitions. [2021-11-07 07:41:02,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 816 [2021-11-07 07:41:02,583 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:41:02,584 INFO L513 BasicCegarLoop]: trace histogram [288, 288, 48, 48, 48, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:41:02,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-07 07:41:02,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-07 07:41:02,805 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:41:02,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:41:02,805 INFO L85 PathProgramCache]: Analyzing trace with hash -562313306, now seen corresponding path program 8 times [2021-11-07 07:41:02,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:41:02,806 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081363609] [2021-11-07 07:41:02,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:41:02,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:41:02,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:41:03,154 INFO L134 CoverageAnalysis]: Checked inductivity of 101267 backedges. 11891 proven. 264 refuted. 0 times theorem prover too weak. 89112 trivial. 0 not checked. [2021-11-07 07:41:03,155 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:41:03,155 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081363609] [2021-11-07 07:41:03,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081363609] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:03,155 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19167397] [2021-11-07 07:41:03,156 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 07:41:03,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:41:03,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:41:03,159 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:41:03,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-07 07:41:03,874 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 07:41:03,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:41:03,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 1378 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 07:41:03,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:41:05,795 INFO L134 CoverageAnalysis]: Checked inductivity of 101267 backedges. 11891 proven. 264 refuted. 0 times theorem prover too weak. 89112 trivial. 0 not checked. [2021-11-07 07:41:05,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19167397] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:05,796 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:41:05,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-11-07 07:41:05,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646499656] [2021-11-07 07:41:05,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 07:41:05,802 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:41:05,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 07:41:05,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-07 07:41:05,803 INFO L87 Difference]: Start difference. First operand 816 states and 894 transitions. Second operand has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:05,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:41:05,944 INFO L93 Difference]: Finished difference Result 2044 states and 2244 transitions. [2021-11-07 07:41:05,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 07:41:05,945 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 815 [2021-11-07 07:41:05,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:41:05,954 INFO L225 Difference]: With dead ends: 2044 [2021-11-07 07:41:05,954 INFO L226 Difference]: Without dead ends: 1280 [2021-11-07 07:41:05,956 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 815 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-07 07:41:05,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1280 states. [2021-11-07 07:41:06,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1280 to 1056. [2021-11-07 07:41:06,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1056 states, 1055 states have (on average 1.0900473933649288) internal successors, (1150), 1055 states have internal predecessors, (1150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:06,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1056 states to 1056 states and 1150 transitions. [2021-11-07 07:41:06,065 INFO L78 Accepts]: Start accepts. Automaton has 1056 states and 1150 transitions. Word has length 815 [2021-11-07 07:41:06,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:41:06,066 INFO L470 AbstractCegarLoop]: Abstraction has 1056 states and 1150 transitions. [2021-11-07 07:41:06,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:06,066 INFO L276 IsEmpty]: Start isEmpty. Operand 1056 states and 1150 transitions. [2021-11-07 07:41:06,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1056 [2021-11-07 07:41:06,079 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:41:06,079 INFO L513 BasicCegarLoop]: trace histogram [384, 384, 64, 64, 64, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:41:06,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-07 07:41:06,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-07 07:41:06,296 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:41:06,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:41:06,297 INFO L85 PathProgramCache]: Analyzing trace with hash 2018124710, now seen corresponding path program 9 times [2021-11-07 07:41:06,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:41:06,297 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533786202] [2021-11-07 07:41:06,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:41:06,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:41:06,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:41:06,897 INFO L134 CoverageAnalysis]: Checked inductivity of 179355 backedges. 21056 proven. 526 refuted. 0 times theorem prover too weak. 157773 trivial. 0 not checked. [2021-11-07 07:41:06,898 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:41:06,898 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533786202] [2021-11-07 07:41:06,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533786202] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:06,899 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968551693] [2021-11-07 07:41:06,899 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 07:41:06,899 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:41:06,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:41:06,900 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:41:06,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-07 07:41:07,742 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-11-07 07:41:07,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:41:07,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 07:41:07,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:41:10,438 INFO L134 CoverageAnalysis]: Checked inductivity of 179355 backedges. 21082 proven. 526 refuted. 0 times theorem prover too weak. 157747 trivial. 0 not checked. [2021-11-07 07:41:10,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968551693] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:10,439 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:41:10,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-11-07 07:41:10,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182658473] [2021-11-07 07:41:10,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 07:41:10,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:41:10,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 07:41:10,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-11-07 07:41:10,444 INFO L87 Difference]: Start difference. First operand 1056 states and 1150 transitions. Second operand has 8 states, 8 states have (on average 8.375) internal successors, (67), 8 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) [2021-11-07 07:41:10,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:41:10,601 INFO L93 Difference]: Finished difference Result 2509 states and 2740 transitions. [2021-11-07 07:41:10,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 07:41:10,601 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.375) internal successors, (67), 8 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 1055 [2021-11-07 07:41:10,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:41:10,613 INFO L225 Difference]: With dead ends: 2509 [2021-11-07 07:41:10,614 INFO L226 Difference]: Without dead ends: 1520 [2021-11-07 07:41:10,618 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1061 GetRequests, 1055 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-11-07 07:41:10,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1520 states. [2021-11-07 07:41:10,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1520 to 1296. [2021-11-07 07:41:10,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1296 states, 1295 states have (on average 1.0857142857142856) internal successors, (1406), 1295 states have internal predecessors, (1406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:10,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1296 states to 1296 states and 1406 transitions. [2021-11-07 07:41:10,730 INFO L78 Accepts]: Start accepts. Automaton has 1296 states and 1406 transitions. Word has length 1055 [2021-11-07 07:41:10,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:41:10,732 INFO L470 AbstractCegarLoop]: Abstraction has 1296 states and 1406 transitions. [2021-11-07 07:41:10,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 8.375) internal successors, (67), 8 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) [2021-11-07 07:41:10,733 INFO L276 IsEmpty]: Start isEmpty. Operand 1296 states and 1406 transitions. [2021-11-07 07:41:10,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1296 [2021-11-07 07:41:10,759 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:41:10,760 INFO L513 BasicCegarLoop]: trace histogram [480, 480, 80, 80, 80, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:41:10,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-07 07:41:10,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-07 07:41:10,983 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:41:10,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:41:10,984 INFO L85 PathProgramCache]: Analyzing trace with hash 1562673062, now seen corresponding path program 10 times [2021-11-07 07:41:10,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:41:10,985 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685081547] [2021-11-07 07:41:10,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:41:10,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:41:11,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:41:12,170 INFO L134 CoverageAnalysis]: Checked inductivity of 279715 backedges. 32831 proven. 875 refuted. 0 times theorem prover too weak. 246009 trivial. 0 not checked. [2021-11-07 07:41:12,171 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:41:12,171 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685081547] [2021-11-07 07:41:12,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685081547] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:12,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [909854437] [2021-11-07 07:41:12,172 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 07:41:12,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:41:12,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:41:12,174 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:41:12,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-07 07:41:13,640 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 07:41:13,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:41:13,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 2117 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 07:41:13,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:41:16,690 INFO L134 CoverageAnalysis]: Checked inductivity of 279715 backedges. 32831 proven. 875 refuted. 0 times theorem prover too weak. 246009 trivial. 0 not checked. [2021-11-07 07:41:16,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [909854437] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:16,691 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:41:16,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-11-07 07:41:16,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549210286] [2021-11-07 07:41:16,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 07:41:16,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:41:16,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 07:41:16,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-11-07 07:41:16,696 INFO L87 Difference]: Start difference. First operand 1296 states and 1406 transitions. Second operand has 9 states, 9 states have (on average 6.444444444444445) internal successors, (58), 9 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:16,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:41:16,854 INFO L93 Difference]: Finished difference Result 2750 states and 2996 transitions. [2021-11-07 07:41:16,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 07:41:16,855 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 6.444444444444445) internal successors, (58), 9 states have internal predecessors, (58), 0 states have call successors, (0), 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 1295 [2021-11-07 07:41:16,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:41:16,865 INFO L225 Difference]: With dead ends: 2750 [2021-11-07 07:41:16,865 INFO L226 Difference]: Without dead ends: 1536 [2021-11-07 07:41:16,871 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1302 GetRequests, 1295 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-11-07 07:41:16,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1536 states. [2021-11-07 07:41:16,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1536 to 1536. [2021-11-07 07:41:16,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1536 states, 1535 states have (on average 1.0827361563517914) internal successors, (1662), 1535 states have internal predecessors, (1662), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:17,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1536 states to 1536 states and 1662 transitions. [2021-11-07 07:41:17,010 INFO L78 Accepts]: Start accepts. Automaton has 1536 states and 1662 transitions. Word has length 1295 [2021-11-07 07:41:17,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:41:17,013 INFO L470 AbstractCegarLoop]: Abstraction has 1536 states and 1662 transitions. [2021-11-07 07:41:17,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 6.444444444444445) internal successors, (58), 9 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:17,015 INFO L276 IsEmpty]: Start isEmpty. Operand 1536 states and 1662 transitions. [2021-11-07 07:41:17,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1536 [2021-11-07 07:41:17,105 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:41:17,107 INFO L513 BasicCegarLoop]: trace histogram [576, 576, 96, 96, 96, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:41:17,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-07 07:41:17,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-07 07:41:17,331 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:41:17,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:41:17,332 INFO L85 PathProgramCache]: Analyzing trace with hash -477439066, now seen corresponding path program 11 times [2021-11-07 07:41:17,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:41:17,332 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745782519] [2021-11-07 07:41:17,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:41:17,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:41:17,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:41:18,394 INFO L134 CoverageAnalysis]: Checked inductivity of 402347 backedges. 88169 proven. 3149 refuted. 0 times theorem prover too weak. 311029 trivial. 0 not checked. [2021-11-07 07:41:18,394 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:41:18,394 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745782519] [2021-11-07 07:41:18,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745782519] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:18,395 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580683093] [2021-11-07 07:41:18,395 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 07:41:18,396 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:41:18,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:41:18,397 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:41:18,405 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-07 07:41:20,147 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2021-11-07 07:41:20,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:41:20,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 07:41:20,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:41:23,796 INFO L134 CoverageAnalysis]: Checked inductivity of 402347 backedges. 214138 proven. 3149 refuted. 0 times theorem prover too weak. 185060 trivial. 0 not checked. [2021-11-07 07:41:23,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580683093] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:23,797 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:41:23,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-11-07 07:41:23,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847775911] [2021-11-07 07:41:23,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 07:41:23,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:41:23,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 07:41:23,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-07 07:41:23,801 INFO L87 Difference]: Start difference. First operand 1536 states and 1662 transitions. Second operand has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 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) [2021-11-07 07:41:24,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:41:24,073 INFO L93 Difference]: Finished difference Result 4360 states and 4717 transitions. [2021-11-07 07:41:24,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 07:41:24,074 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 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 1535 [2021-11-07 07:41:24,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:41:24,094 INFO L225 Difference]: With dead ends: 4360 [2021-11-07 07:41:24,094 INFO L226 Difference]: Without dead ends: 3016 [2021-11-07 07:41:24,098 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1539 GetRequests, 1535 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-07 07:41:24,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3016 states. [2021-11-07 07:41:24,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3016 to 2280. [2021-11-07 07:41:24,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2280 states, 2279 states have (on average 1.0802983764809126) internal successors, (2462), 2279 states have internal predecessors, (2462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:24,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2280 states to 2280 states and 2462 transitions. [2021-11-07 07:41:24,440 INFO L78 Accepts]: Start accepts. Automaton has 2280 states and 2462 transitions. Word has length 1535 [2021-11-07 07:41:24,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:41:24,444 INFO L470 AbstractCegarLoop]: Abstraction has 2280 states and 2462 transitions. [2021-11-07 07:41:24,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 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) [2021-11-07 07:41:24,445 INFO L276 IsEmpty]: Start isEmpty. Operand 2280 states and 2462 transitions. [2021-11-07 07:41:24,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2280 [2021-11-07 07:41:24,526 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:41:24,528 INFO L513 BasicCegarLoop]: trace histogram [864, 864, 144, 144, 144, 24, 24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:41:24,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-07 07:41:24,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-07 07:41:24,751 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:41:24,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:41:24,753 INFO L85 PathProgramCache]: Analyzing trace with hash 1103046054, now seen corresponding path program 12 times [2021-11-07 07:41:24,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:41:24,753 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397357488] [2021-11-07 07:41:24,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:41:24,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:41:25,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:41:26,411 INFO L134 CoverageAnalysis]: Checked inductivity of 905559 backedges. 198328 proven. 9444 refuted. 0 times theorem prover too weak. 697787 trivial. 0 not checked. [2021-11-07 07:41:26,411 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:41:26,412 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397357488] [2021-11-07 07:41:26,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397357488] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:26,412 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [30356279] [2021-11-07 07:41:26,412 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 07:41:26,413 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:41:26,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:41:26,414 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:41:26,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-07 07:41:29,372 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 195 check-sat command(s) [2021-11-07 07:41:29,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:41:29,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 1153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 07:41:29,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:41:34,906 INFO L134 CoverageAnalysis]: Checked inductivity of 905559 backedges. 198339 proven. 9444 refuted. 0 times theorem prover too weak. 697776 trivial. 0 not checked. [2021-11-07 07:41:34,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [30356279] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:34,907 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:41:34,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-11-07 07:41:34,909 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846809389] [2021-11-07 07:41:34,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 07:41:34,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:41:34,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 07:41:34,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-07 07:41:34,914 INFO L87 Difference]: Start difference. First operand 2280 states and 2462 transitions. Second operand has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:35,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:41:35,172 INFO L93 Difference]: Finished difference Result 5755 states and 6217 transitions. [2021-11-07 07:41:35,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 07:41:35,173 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 0 states have call successors, (0), 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 2279 [2021-11-07 07:41:35,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:41:35,198 INFO L225 Difference]: With dead ends: 5755 [2021-11-07 07:41:35,198 INFO L226 Difference]: Without dead ends: 3760 [2021-11-07 07:41:35,203 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2284 GetRequests, 2279 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-07 07:41:35,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3760 states. [2021-11-07 07:41:35,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3760 to 3024. [2021-11-07 07:41:35,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3024 states, 3023 states have (on average 1.0790605358914984) internal successors, (3262), 3023 states have internal predecessors, (3262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:35,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3024 states to 3024 states and 3262 transitions. [2021-11-07 07:41:35,430 INFO L78 Accepts]: Start accepts. Automaton has 3024 states and 3262 transitions. Word has length 2279 [2021-11-07 07:41:35,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:41:35,431 INFO L470 AbstractCegarLoop]: Abstraction has 3024 states and 3262 transitions. [2021-11-07 07:41:35,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:35,432 INFO L276 IsEmpty]: Start isEmpty. Operand 3024 states and 3262 transitions. [2021-11-07 07:41:35,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3024 [2021-11-07 07:41:35,510 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:41:35,511 INFO L513 BasicCegarLoop]: trace histogram [1152, 1152, 192, 192, 192, 32, 32, 32, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:41:35,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-07 07:41:35,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-07 07:41:35,712 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:41:35,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:41:35,714 INFO L85 PathProgramCache]: Analyzing trace with hash 2117119910, now seen corresponding path program 13 times [2021-11-07 07:41:35,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:41:35,714 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23183293] [2021-11-07 07:41:35,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:41:35,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:41:36,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:41:39,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1610179 backedges. 352545 proven. 18886 refuted. 0 times theorem prover too weak. 1238748 trivial. 0 not checked. [2021-11-07 07:41:39,010 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:41:39,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23183293] [2021-11-07 07:41:39,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23183293] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:39,011 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629861784] [2021-11-07 07:41:39,011 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 07:41:39,011 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:41:39,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:41:39,013 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:41:39,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-07 07:41:42,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:41:42,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 4930 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 07:41:42,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:41:49,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1610179 backedges. 352545 proven. 18886 refuted. 0 times theorem prover too weak. 1238748 trivial. 0 not checked. [2021-11-07 07:41:49,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [629861784] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:49,616 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:41:49,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-11-07 07:41:49,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666649990] [2021-11-07 07:41:49,623 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 07:41:49,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:41:49,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 07:41:49,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-11-07 07:41:49,625 INFO L87 Difference]: Start difference. First operand 3024 states and 3262 transitions. Second operand has 8 states, 8 states have (on average 8.375) internal successors, (67), 8 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) [2021-11-07 07:41:49,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:41:49,923 INFO L93 Difference]: Finished difference Result 7150 states and 7717 transitions. [2021-11-07 07:41:49,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 07:41:49,923 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.375) internal successors, (67), 8 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 3023 [2021-11-07 07:41:49,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:41:49,949 INFO L225 Difference]: With dead ends: 7150 [2021-11-07 07:41:49,949 INFO L226 Difference]: Without dead ends: 4504 [2021-11-07 07:41:49,956 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3029 GetRequests, 3023 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-11-07 07:41:49,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4504 states. [2021-11-07 07:41:50,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4504 to 3768. [2021-11-07 07:41:50,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3768 states, 3767 states have (on average 1.0783116538359436) internal successors, (4062), 3767 states have internal predecessors, (4062), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:41:50,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3768 states to 3768 states and 4062 transitions. [2021-11-07 07:41:50,289 INFO L78 Accepts]: Start accepts. Automaton has 3768 states and 4062 transitions. Word has length 3023 [2021-11-07 07:41:50,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:41:50,291 INFO L470 AbstractCegarLoop]: Abstraction has 3768 states and 4062 transitions. [2021-11-07 07:41:50,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 8.375) internal successors, (67), 8 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) [2021-11-07 07:41:50,292 INFO L276 IsEmpty]: Start isEmpty. Operand 3768 states and 4062 transitions. [2021-11-07 07:41:50,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3768 [2021-11-07 07:41:50,458 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:41:50,460 INFO L513 BasicCegarLoop]: trace histogram [1440, 1440, 240, 240, 240, 40, 40, 40, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:41:50,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-07 07:41:50,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:41:50,663 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:41:50,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:41:50,665 INFO L85 PathProgramCache]: Analyzing trace with hash -732399194, now seen corresponding path program 14 times [2021-11-07 07:41:50,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:41:50,665 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1715219350] [2021-11-07 07:41:50,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:41:50,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:41:51,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:41:55,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2516207 backedges. 550820 proven. 31475 refuted. 0 times theorem prover too weak. 1933912 trivial. 0 not checked. [2021-11-07 07:41:55,032 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:41:55,033 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1715219350] [2021-11-07 07:41:55,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1715219350] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:41:55,033 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [298843988] [2021-11-07 07:41:55,034 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 07:41:55,034 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:41:55,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:41:55,039 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:41:55,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-07 07:41:59,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 07:41:59,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:41:59,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 6130 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 07:41:59,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:42:07,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2516207 backedges. 550820 proven. 31475 refuted. 0 times theorem prover too weak. 1933912 trivial. 0 not checked. [2021-11-07 07:42:07,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [298843988] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:42:07,728 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:42:07,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-11-07 07:42:07,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854653574] [2021-11-07 07:42:07,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 07:42:07,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:42:07,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 07:42:07,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-11-07 07:42:07,735 INFO L87 Difference]: Start difference. First operand 3768 states and 4062 transitions. Second operand has 9 states, 9 states have (on average 8.333333333333334) internal successors, (75), 9 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:42:07,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:42:07,954 INFO L93 Difference]: Finished difference Result 7809 states and 8425 transitions. [2021-11-07 07:42:07,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 07:42:07,954 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 8.333333333333334) internal successors, (75), 9 states have internal predecessors, (75), 0 states have call successors, (0), 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 3767 [2021-11-07 07:42:07,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:42:07,983 INFO L225 Difference]: With dead ends: 7809 [2021-11-07 07:42:07,983 INFO L226 Difference]: Without dead ends: 4512 [2021-11-07 07:42:07,989 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3774 GetRequests, 3767 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-11-07 07:42:07,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4512 states. [2021-11-07 07:42:08,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4512 to 4512. [2021-11-07 07:42:08,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4512 states, 4511 states have (on average 1.0778097982708934) internal successors, (4862), 4511 states have internal predecessors, (4862), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:42:08,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4512 states to 4512 states and 4862 transitions. [2021-11-07 07:42:08,397 INFO L78 Accepts]: Start accepts. Automaton has 4512 states and 4862 transitions. Word has length 3767 [2021-11-07 07:42:08,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:42:08,400 INFO L470 AbstractCegarLoop]: Abstraction has 4512 states and 4862 transitions. [2021-11-07 07:42:08,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 8.333333333333334) internal successors, (75), 9 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:42:08,400 INFO L276 IsEmpty]: Start isEmpty. Operand 4512 states and 4862 transitions. [2021-11-07 07:42:08,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4512 [2021-11-07 07:42:08,621 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:42:08,623 INFO L513 BasicCegarLoop]: trace histogram [1728, 1728, 288, 288, 288, 48, 48, 48, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:42:08,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-07 07:42:08,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:42:08,839 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:42:08,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:42:08,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1826454618, now seen corresponding path program 15 times [2021-11-07 07:42:08,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:42:08,841 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420796844] [2021-11-07 07:42:08,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:42:08,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:42:09,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:42:14,433 INFO L134 CoverageAnalysis]: Checked inductivity of 3623643 backedges. 1359706 proven. 113309 refuted. 0 times theorem prover too weak. 2150628 trivial. 0 not checked. [2021-11-07 07:42:14,433 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:42:14,433 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420796844] [2021-11-07 07:42:14,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420796844] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:42:14,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900395395] [2021-11-07 07:42:14,434 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 07:42:14,435 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:42:14,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:42:14,443 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:42:14,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-07 07:42:21,386 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 378 check-sat command(s) [2021-11-07 07:42:21,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:42:21,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 2353 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 07:42:21,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:42:32,270 INFO L134 CoverageAnalysis]: Checked inductivity of 3623643 backedges. 1359710 proven. 113309 refuted. 0 times theorem prover too weak. 2150624 trivial. 0 not checked. [2021-11-07 07:42:32,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900395395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:42:32,271 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:42:32,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-11-07 07:42:32,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751541984] [2021-11-07 07:42:32,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 07:42:32,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:42:32,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 07:42:32,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-07 07:42:32,279 INFO L87 Difference]: Start difference. First operand 4512 states and 4862 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:42:32,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:42:32,700 INFO L93 Difference]: Finished difference Result 12381 states and 13342 transitions. [2021-11-07 07:42:32,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 07:42:32,701 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 0 states have call successors, (0), 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 4511 [2021-11-07 07:42:32,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:42:32,754 INFO L225 Difference]: With dead ends: 12381 [2021-11-07 07:42:32,754 INFO L226 Difference]: Without dead ends: 8996 [2021-11-07 07:42:32,763 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4515 GetRequests, 4511 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-07 07:42:32,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8996 states. [2021-11-07 07:42:33,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8996 to 6756. [2021-11-07 07:42:33,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6756 states, 6755 states have (on average 1.0774241302738712) internal successors, (7278), 6755 states have internal predecessors, (7278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:42:33,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6756 states to 6756 states and 7278 transitions. [2021-11-07 07:42:33,286 INFO L78 Accepts]: Start accepts. Automaton has 6756 states and 7278 transitions. Word has length 4511 [2021-11-07 07:42:33,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:42:33,288 INFO L470 AbstractCegarLoop]: Abstraction has 6756 states and 7278 transitions. [2021-11-07 07:42:33,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:42:33,289 INFO L276 IsEmpty]: Start isEmpty. Operand 6756 states and 7278 transitions. [2021-11-07 07:42:33,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6756 [2021-11-07 07:42:33,649 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:42:33,652 INFO L513 BasicCegarLoop]: trace histogram [2592, 2592, 432, 432, 432, 72, 72, 72, 12, 12, 12, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:42:33,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-07 07:42:33,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:42:33,853 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:42:33,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:42:33,855 INFO L85 PathProgramCache]: Analyzing trace with hash -1834389082, now seen corresponding path program 16 times [2021-11-07 07:42:33,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:42:33,855 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837999567] [2021-11-07 07:42:33,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:42:33,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:42:36,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:42:45,469 INFO L134 CoverageAnalysis]: Checked inductivity of 8154817 backedges. 3059317 proven. 339924 refuted. 0 times theorem prover too weak. 4755576 trivial. 0 not checked. [2021-11-07 07:42:45,469 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:42:45,469 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837999567] [2021-11-07 07:42:45,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837999567] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:42:45,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142449225] [2021-11-07 07:42:45,470 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 07:42:45,470 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:42:45,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:42:45,471 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:42:45,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-07 07:42:52,946 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 07:42:52,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:42:52,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 10925 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 07:42:53,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:43:07,703 INFO L134 CoverageAnalysis]: Checked inductivity of 8154817 backedges. 3059317 proven. 339924 refuted. 0 times theorem prover too weak. 4755576 trivial. 0 not checked. [2021-11-07 07:43:07,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1142449225] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:43:07,704 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:43:07,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-11-07 07:43:07,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758809424] [2021-11-07 07:43:07,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 07:43:07,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:43:07,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 07:43:07,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-07 07:43:07,713 INFO L87 Difference]: Start difference. First operand 6756 states and 7278 transitions. Second operand has 7 states, 7 states have (on average 10.0) internal successors, (70), 7 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:43:08,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:43:08,212 INFO L93 Difference]: Finished difference Result 16308 states and 17570 transitions. [2021-11-07 07:43:08,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 07:43:08,213 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.0) internal successors, (70), 7 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6755 [2021-11-07 07:43:08,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:43:08,237 INFO L225 Difference]: With dead ends: 16308 [2021-11-07 07:43:08,237 INFO L226 Difference]: Without dead ends: 11240 [2021-11-07 07:43:08,247 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6760 GetRequests, 6755 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-07 07:43:08,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11240 states. [2021-11-07 07:43:08,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11240 to 9000. [2021-11-07 07:43:08,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9000 states, 8999 states have (on average 1.0772308034226026) internal successors, (9694), 8999 states have internal predecessors, (9694), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:43:08,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9000 states to 9000 states and 9694 transitions. [2021-11-07 07:43:08,831 INFO L78 Accepts]: Start accepts. Automaton has 9000 states and 9694 transitions. Word has length 6755 [2021-11-07 07:43:08,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:43:08,835 INFO L470 AbstractCegarLoop]: Abstraction has 9000 states and 9694 transitions. [2021-11-07 07:43:08,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.0) internal successors, (70), 7 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 07:43:08,835 INFO L276 IsEmpty]: Start isEmpty. Operand 9000 states and 9694 transitions. [2021-11-07 07:43:09,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9000 [2021-11-07 07:43:09,413 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:43:09,417 INFO L513 BasicCegarLoop]: trace histogram [3456, 3456, 576, 576, 576, 96, 96, 96, 16, 16, 16, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-07 07:43:09,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-07 07:43:09,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5687651b-e43b-44a9-ab5d-a614216ed6c2/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-07 07:43:09,618 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 07:43:09,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:43:09,620 INFO L85 PathProgramCache]: Analyzing trace with hash -65645146, now seen corresponding path program 17 times [2021-11-07 07:43:09,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:43:09,620 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473783795] [2021-11-07 07:43:09,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:43:09,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:43:14,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat