./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f8e1c903 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX --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 07a8b8b198dffd8285677bd0bfdd16b4d1f780e3a9696ef3e27a077e8ff12a49 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-f8e1c90 [2021-11-09 09:51:47,833 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-09 09:51:47,838 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-09 09:51:47,924 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-09 09:51:47,925 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-09 09:51:47,927 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-09 09:51:47,929 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-09 09:51:47,933 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-09 09:51:47,936 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-09 09:51:47,938 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-09 09:51:47,940 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-09 09:51:47,942 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-09 09:51:47,943 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-09 09:51:47,945 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-09 09:51:47,947 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-09 09:51:47,950 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-09 09:51:47,952 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-09 09:51:47,954 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-09 09:51:47,958 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-09 09:51:47,962 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-09 09:51:47,965 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-09 09:51:47,968 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-09 09:51:47,971 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-09 09:51:47,973 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-09 09:51:47,979 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-09 09:51:47,980 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-09 09:51:47,981 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-09 09:51:47,983 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-09 09:51:47,985 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-09 09:51:47,987 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-09 09:51:47,990 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-09 09:51:47,994 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-09 09:51:47,996 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-09 09:51:47,997 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-09 09:51:48,000 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-09 09:51:48,000 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-09 09:51:48,002 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-09 09:51:48,002 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-09 09:51:48,003 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-09 09:51:48,004 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-09 09:51:48,006 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-09 09:51:48,010 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-09 09:51:48,081 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-09 09:51:48,081 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-09 09:51:48,082 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-09 09:51:48,082 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-09 09:51:48,085 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-09 09:51:48,085 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-09 09:51:48,085 INFO L138 SettingsManager]: * Use SBE=true [2021-11-09 09:51:48,086 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-09 09:51:48,086 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-09 09:51:48,086 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-09 09:51:48,088 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-09 09:51:48,088 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-09 09:51:48,089 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-09 09:51:48,089 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-09 09:51:48,089 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-09 09:51:48,090 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-09 09:51:48,090 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-09 09:51:48,090 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-09 09:51:48,091 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-09 09:51:48,091 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-09 09:51:48,091 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-09 09:51:48,092 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-09 09:51:48,092 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 09:51:48,092 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-09 09:51:48,093 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-09 09:51:48,093 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-09 09:51:48,093 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-09 09:51:48,094 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-09 09:51:48,094 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-09 09:51:48,096 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-09 09:51:48,097 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-09 09:51:48,097 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-09 09:51:48,097 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_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 07a8b8b198dffd8285677bd0bfdd16b4d1f780e3a9696ef3e27a077e8ff12a49 [2021-11-09 09:51:48,476 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-09 09:51:48,504 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-09 09:51:48,508 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-09 09:51:48,510 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-09 09:51:48,511 INFO L275 PluginConnector]: CDTParser initialized [2021-11-09 09:51:48,512 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/../../sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c [2021-11-09 09:51:48,622 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/data/e4bc1b196/53a90a0cd9f24655a48e3aa30a8a5aeb/FLAG5b250cdfc [2021-11-09 09:51:49,278 INFO L306 CDTParser]: Found 1 translation units. [2021-11-09 09:51:49,279 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c [2021-11-09 09:51:49,300 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/data/e4bc1b196/53a90a0cd9f24655a48e3aa30a8a5aeb/FLAG5b250cdfc [2021-11-09 09:51:49,572 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/data/e4bc1b196/53a90a0cd9f24655a48e3aa30a8a5aeb [2021-11-09 09:51:49,576 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-09 09:51:49,579 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-09 09:51:49,581 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-09 09:51:49,582 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-09 09:51:49,587 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-09 09:51:49,588 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:49,590 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f7433bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49, skipping insertion in model container [2021-11-09 09:51:49,591 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:49,602 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-09 09:51:49,628 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-09 09:51:49,840 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_3d83eced-029a-4cde-9561-e19c4b11098e/sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c[342,355] [2021-11-09 09:51:49,878 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 09:51:49,890 INFO L203 MainTranslator]: Completed pre-run [2021-11-09 09:51:49,920 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_3d83eced-029a-4cde-9561-e19c4b11098e/sv-benchmarks/c/array-industry-pattern/check_removal_from_set_after_insertion.c[342,355] [2021-11-09 09:51:49,945 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 09:51:49,975 INFO L208 MainTranslator]: Completed translation [2021-11-09 09:51:49,976 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49 WrapperNode [2021-11-09 09:51:49,977 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-09 09:51:49,978 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-09 09:51:49,979 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-09 09:51:49,979 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-09 09:51:49,988 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:49,997 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:50,055 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-09 09:51:50,062 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-09 09:51:50,062 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-09 09:51:50,063 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-09 09:51:50,074 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:50,075 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:50,101 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:50,102 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:50,111 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:50,121 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:50,131 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:50,138 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-09 09:51:50,151 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-09 09:51:50,151 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-09 09:51:50,151 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-09 09:51:50,156 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (1/1) ... [2021-11-09 09:51:50,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 09:51:50,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:51:50,207 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-09 09:51:50,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-09 09:51:50,272 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-09 09:51:50,272 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-09 09:51:50,273 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-09 09:51:50,273 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-09 09:51:50,273 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-09 09:51:50,274 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-09 09:51:50,274 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-09 09:51:50,803 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-09 09:51:50,803 INFO L299 CfgBuilder]: Removed 16 assume(true) statements. [2021-11-09 09:51:50,806 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:51:50 BoogieIcfgContainer [2021-11-09 09:51:50,806 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-09 09:51:50,809 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-09 09:51:50,809 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-09 09:51:50,814 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-09 09:51:50,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 09:51:49" (1/3) ... [2021-11-09 09:51:50,815 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@191702d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 09:51:50, skipping insertion in model container [2021-11-09 09:51:50,816 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:51:49" (2/3) ... [2021-11-09 09:51:50,816 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@191702d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 09:51:50, skipping insertion in model container [2021-11-09 09:51:50,817 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:51:50" (3/3) ... [2021-11-09 09:51:50,819 INFO L111 eAbstractionObserver]: Analyzing ICFG check_removal_from_set_after_insertion.c [2021-11-09 09:51:50,826 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-09 09:51:50,826 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-09 09:51:50,900 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-09 09:51:50,912 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 [2021-11-09 09:51:50,912 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-09 09:51:50,934 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 31 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:50,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-09 09:51:50,942 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:50,943 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:51:50,944 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:50,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:50,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1525882359, now seen corresponding path program 1 times [2021-11-09 09:51:50,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:50,964 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87720942] [2021-11-09 09:51:50,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:50,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:51,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:51,244 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:51:51,250 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:51,251 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87720942] [2021-11-09 09:51:51,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87720942] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:51:51,252 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:51:51,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 09:51:51,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732584811] [2021-11-09 09:51:51,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 09:51:51,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:51,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 09:51:51,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:51:51,288 INFO L87 Difference]: Start difference. First operand has 32 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 31 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:51,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:51,470 INFO L93 Difference]: Finished difference Result 77 states and 118 transitions. [2021-11-09 09:51:51,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 09:51:51,473 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-09 09:51:51,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:51,484 INFO L225 Difference]: With dead ends: 77 [2021-11-09 09:51:51,484 INFO L226 Difference]: Without dead ends: 41 [2021-11-09 09:51:51,488 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:51:51,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-09 09:51:51,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 29. [2021-11-09 09:51:51,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 28 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:51,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2021-11-09 09:51:51,534 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 12 [2021-11-09 09:51:51,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:51,535 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2021-11-09 09:51:51,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:51,535 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2021-11-09 09:51:51,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-09 09:51:51,537 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:51,537 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:51:51,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-09 09:51:51,538 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:51,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:51,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1053753351, now seen corresponding path program 1 times [2021-11-09 09:51:51,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:51,541 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639742727] [2021-11-09 09:51:51,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:51,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:51,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:51,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:51:51,646 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:51,647 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639742727] [2021-11-09 09:51:51,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639742727] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:51:51,648 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:51:51,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 09:51:51,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197302912] [2021-11-09 09:51:51,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 09:51:51,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:51,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 09:51:51,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:51:51,654 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand has 4 states, 4 states have (on average 3.5) 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) [2021-11-09 09:51:51,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:51,723 INFO L93 Difference]: Finished difference Result 52 states and 69 transitions. [2021-11-09 09:51:51,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 09:51:51,724 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) 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 [2021-11-09 09:51:51,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:51,726 INFO L225 Difference]: With dead ends: 52 [2021-11-09 09:51:51,726 INFO L226 Difference]: Without dead ends: 38 [2021-11-09 09:51:51,727 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:51:51,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-09 09:51:51,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2021-11-09 09:51:51,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:51,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2021-11-09 09:51:51,738 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 14 [2021-11-09 09:51:51,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:51,739 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2021-11-09 09:51:51,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) 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) [2021-11-09 09:51:51,739 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2021-11-09 09:51:51,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-09 09:51:51,741 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:51,741 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] [2021-11-09 09:51:51,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-09 09:51:51,742 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:51,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:51,743 INFO L85 PathProgramCache]: Analyzing trace with hash 1072948653, now seen corresponding path program 1 times [2021-11-09 09:51:51,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:51,744 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82586537] [2021-11-09 09:51:51,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:51,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:51,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:51,930 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:51:51,931 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:51,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82586537] [2021-11-09 09:51:51,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82586537] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:51:51,934 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:51:51,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-09 09:51:51,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672456194] [2021-11-09 09:51:51,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 09:51:51,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:51,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 09:51:51,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:51:51,941 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 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) [2021-11-09 09:51:52,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:52,010 INFO L93 Difference]: Finished difference Result 90 states and 119 transitions. [2021-11-09 09:51:52,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-09 09:51:52,018 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 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 [2021-11-09 09:51:52,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:52,020 INFO L225 Difference]: With dead ends: 90 [2021-11-09 09:51:52,020 INFO L226 Difference]: Without dead ends: 67 [2021-11-09 09:51:52,021 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-09 09:51:52,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-09 09:51:52,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 36. [2021-11-09 09:51:52,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 35 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) [2021-11-09 09:51:52,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2021-11-09 09:51:52,042 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 20 [2021-11-09 09:51:52,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:52,043 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2021-11-09 09:51:52,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 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) [2021-11-09 09:51:52,044 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2021-11-09 09:51:52,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-09 09:51:52,045 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:52,046 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] [2021-11-09 09:51:52,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-09 09:51:52,047 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:52,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:52,049 INFO L85 PathProgramCache]: Analyzing trace with hash -1602550877, now seen corresponding path program 1 times [2021-11-09 09:51:52,050 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:52,050 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889660101] [2021-11-09 09:51:52,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:52,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:52,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:52,141 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:51:52,141 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:52,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889660101] [2021-11-09 09:51:52,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889660101] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:51:52,142 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:51:52,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-09 09:51:52,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718873685] [2021-11-09 09:51:52,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 09:51:52,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:52,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 09:51:52,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:51:52,145 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 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) [2021-11-09 09:51:52,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:52,217 INFO L93 Difference]: Finished difference Result 82 states and 108 transitions. [2021-11-09 09:51:52,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 09:51:52,223 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 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 [2021-11-09 09:51:52,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:52,228 INFO L225 Difference]: With dead ends: 82 [2021-11-09 09:51:52,229 INFO L226 Difference]: Without dead ends: 53 [2021-11-09 09:51:52,229 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-09 09:51:52,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-09 09:51:52,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 33. [2021-11-09 09:51:52,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.3125) internal successors, (42), 32 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) [2021-11-09 09:51:52,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2021-11-09 09:51:52,241 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 20 [2021-11-09 09:51:52,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:52,241 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2021-11-09 09:51:52,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 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) [2021-11-09 09:51:52,242 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2021-11-09 09:51:52,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-09 09:51:52,243 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:52,244 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] [2021-11-09 09:51:52,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-09 09:51:52,244 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:52,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:52,245 INFO L85 PathProgramCache]: Analyzing trace with hash -969039925, now seen corresponding path program 1 times [2021-11-09 09:51:52,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:52,246 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574630292] [2021-11-09 09:51:52,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:52,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:52,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:52,355 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-09 09:51:52,355 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:52,355 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574630292] [2021-11-09 09:51:52,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574630292] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:51:52,356 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:51:52,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 09:51:52,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638116749] [2021-11-09 09:51:52,357 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-09 09:51:52,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:52,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-09 09:51:52,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-09 09:51:52,359 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand has 3 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:52,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:52,384 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2021-11-09 09:51:52,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-09 09:51:52,385 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-09 09:51:52,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:52,386 INFO L225 Difference]: With dead ends: 46 [2021-11-09 09:51:52,386 INFO L226 Difference]: Without dead ends: 35 [2021-11-09 09:51:52,387 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-09 09:51:52,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-09 09:51:52,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-09 09:51:52,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2647058823529411) internal successors, (43), 34 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) [2021-11-09 09:51:52,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2021-11-09 09:51:52,398 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 21 [2021-11-09 09:51:52,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:52,398 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2021-11-09 09:51:52,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:52,399 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2021-11-09 09:51:52,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-09 09:51:52,400 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:52,401 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, 1, 1, 1] [2021-11-09 09:51:52,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-09 09:51:52,401 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:52,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:52,402 INFO L85 PathProgramCache]: Analyzing trace with hash -1842211539, now seen corresponding path program 1 times [2021-11-09 09:51:52,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:52,403 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594195763] [2021-11-09 09:51:52,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:52,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:52,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:52,602 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-09 09:51:52,603 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:52,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594195763] [2021-11-09 09:51:52,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594195763] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:52,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935352122] [2021-11-09 09:51:52,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:52,610 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:52,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:51:52,613 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:51:52,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-09 09:51:52,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:52,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-09 09:51:52,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:51:52,990 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-09 09:51:52,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [935352122] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:52,991 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:51:52,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-11-09 09:51:52,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948027318] [2021-11-09 09:51:52,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-09 09:51:52,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:52,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-09 09:51:52,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:51:52,995 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:53,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:53,212 INFO L93 Difference]: Finished difference Result 120 states and 144 transitions. [2021-11-09 09:51:53,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:51:53,213 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 0 states have call successors, (0), 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 25 [2021-11-09 09:51:53,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:53,216 INFO L225 Difference]: With dead ends: 120 [2021-11-09 09:51:53,216 INFO L226 Difference]: Without dead ends: 90 [2021-11-09 09:51:53,218 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:51:53,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-09 09:51:53,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 45. [2021-11-09 09:51:53,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.25) internal successors, (55), 44 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:53,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 55 transitions. [2021-11-09 09:51:53,247 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 55 transitions. Word has length 25 [2021-11-09 09:51:53,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:53,248 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 55 transitions. [2021-11-09 09:51:53,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:53,249 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 55 transitions. [2021-11-09 09:51:53,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-09 09:51:53,251 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:53,251 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:51:53,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-09 09:51:53,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:53,478 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:53,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:53,478 INFO L85 PathProgramCache]: Analyzing trace with hash -552134993, now seen corresponding path program 2 times [2021-11-09 09:51:53,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:53,479 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839940386] [2021-11-09 09:51:53,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:53,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:53,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:53,571 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-09 09:51:53,572 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:53,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839940386] [2021-11-09 09:51:53,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839940386] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:51:53,573 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:51:53,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 09:51:53,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522671014] [2021-11-09 09:51:53,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-09 09:51:53,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:53,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-09 09:51:53,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-09 09:51:53,577 INFO L87 Difference]: Start difference. First operand 45 states and 55 transitions. Second operand has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 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) [2021-11-09 09:51:53,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:53,608 INFO L93 Difference]: Finished difference Result 60 states and 73 transitions. [2021-11-09 09:51:53,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-09 09:51:53,609 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 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) Word has length 30 [2021-11-09 09:51:53,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:53,613 INFO L225 Difference]: With dead ends: 60 [2021-11-09 09:51:53,613 INFO L226 Difference]: Without dead ends: 45 [2021-11-09 09:51:53,614 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-09 09:51:53,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-09 09:51:53,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-11-09 09:51:53,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2045454545454546) internal successors, (53), 44 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:53,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2021-11-09 09:51:53,640 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 30 [2021-11-09 09:51:53,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:53,642 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2021-11-09 09:51:53,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 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) [2021-11-09 09:51:53,642 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2021-11-09 09:51:53,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-09 09:51:53,644 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:53,645 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:51:53,645 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-09 09:51:53,645 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:53,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:53,646 INFO L85 PathProgramCache]: Analyzing trace with hash -293969555, now seen corresponding path program 1 times [2021-11-09 09:51:53,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:53,646 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593416892] [2021-11-09 09:51:53,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:53,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:53,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:53,757 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:51:53,758 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:53,758 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593416892] [2021-11-09 09:51:53,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593416892] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:53,759 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [971046690] [2021-11-09 09:51:53,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:53,759 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:53,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:51:53,760 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:51:53,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-09 09:51:53,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:53,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-09 09:51:53,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:51:54,055 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:51:54,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [971046690] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:54,056 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:51:54,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-11-09 09:51:54,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652398641] [2021-11-09 09:51:54,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-09 09:51:54,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:54,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-09 09:51:54,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=39, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:51:54,061 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:54,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:54,208 INFO L93 Difference]: Finished difference Result 115 states and 133 transitions. [2021-11-09 09:51:54,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-09 09:51:54,209 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 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 30 [2021-11-09 09:51:54,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:54,210 INFO L225 Difference]: With dead ends: 115 [2021-11-09 09:51:54,210 INFO L226 Difference]: Without dead ends: 77 [2021-11-09 09:51:54,211 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=39, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:51:54,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-09 09:51:54,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 47. [2021-11-09 09:51:54,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 46 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:54,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2021-11-09 09:51:54,240 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 30 [2021-11-09 09:51:54,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:54,240 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2021-11-09 09:51:54,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:54,241 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2021-11-09 09:51:54,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-09 09:51:54,242 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:54,243 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:51:54,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-09 09:51:54,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:54,470 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:54,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:54,471 INFO L85 PathProgramCache]: Analyzing trace with hash 622364399, now seen corresponding path program 2 times [2021-11-09 09:51:54,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:54,471 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924882981] [2021-11-09 09:51:54,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:54,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:54,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:54,596 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:51:54,598 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:54,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924882981] [2021-11-09 09:51:54,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924882981] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:54,601 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848215458] [2021-11-09 09:51:54,601 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:51:54,602 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:54,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:51:54,603 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:51:54,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-09 09:51:54,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:51:54,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:51:54,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-09 09:51:54,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:51:54,909 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:51:54,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1848215458] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:54,909 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:51:54,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-11-09 09:51:54,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861753078] [2021-11-09 09:51:54,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-09 09:51:54,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:54,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-09 09:51:54,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=61, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:51:54,912 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:55,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:55,025 INFO L93 Difference]: Finished difference Result 129 states and 148 transitions. [2021-11-09 09:51:55,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 09:51:55,027 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-09 09:51:55,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:55,029 INFO L225 Difference]: With dead ends: 129 [2021-11-09 09:51:55,030 INFO L226 Difference]: Without dead ends: 91 [2021-11-09 09:51:55,030 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=49, Invalid=61, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:51:55,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-09 09:51:55,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 49. [2021-11-09 09:51:55,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1875) internal successors, (57), 48 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:55,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-11-09 09:51:55,040 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 32 [2021-11-09 09:51:55,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:55,041 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-11-09 09:51:55,041 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:55,041 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-11-09 09:51:55,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-09 09:51:55,043 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:55,043 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:51:55,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-09 09:51:55,254 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-09 09:51:55,254 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:55,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:55,255 INFO L85 PathProgramCache]: Analyzing trace with hash 750998513, now seen corresponding path program 3 times [2021-11-09 09:51:55,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:55,256 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621669415] [2021-11-09 09:51:55,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:55,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:55,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:55,373 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 09:51:55,373 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:55,374 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621669415] [2021-11-09 09:51:55,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621669415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:55,374 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144879877] [2021-11-09 09:51:55,375 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:51:55,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:55,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:51:55,378 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:51:55,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-09 09:51:55,501 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-09 09:51:55,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:51:55,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-09 09:51:55,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:51:55,695 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-09 09:51:55,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144879877] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:55,696 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:51:55,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 9 [2021-11-09 09:51:55,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704622193] [2021-11-09 09:51:55,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-09 09:51:55,697 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:55,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-09 09:51:55,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:51:55,702 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:55,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:55,932 INFO L93 Difference]: Finished difference Result 159 states and 183 transitions. [2021-11-09 09:51:55,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-09 09:51:55,933 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 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 34 [2021-11-09 09:51:55,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:55,934 INFO L225 Difference]: With dead ends: 159 [2021-11-09 09:51:55,935 INFO L226 Difference]: Without dead ends: 121 [2021-11-09 09:51:55,940 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2021-11-09 09:51:55,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-09 09:51:55,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 57. [2021-11-09 09:51:55,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1607142857142858) internal successors, (65), 56 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:55,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 65 transitions. [2021-11-09 09:51:55,960 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 65 transitions. Word has length 34 [2021-11-09 09:51:55,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:55,960 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 65 transitions. [2021-11-09 09:51:55,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:55,961 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 65 transitions. [2021-11-09 09:51:55,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-09 09:51:55,969 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:55,970 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:51:56,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-09 09:51:56,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-09 09:51:56,186 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:56,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:56,187 INFO L85 PathProgramCache]: Analyzing trace with hash 590995391, now seen corresponding path program 1 times [2021-11-09 09:51:56,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:56,187 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821829115] [2021-11-09 09:51:56,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:56,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:56,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:56,312 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-09 09:51:56,313 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:56,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821829115] [2021-11-09 09:51:56,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821829115] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:56,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500411589] [2021-11-09 09:51:56,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:56,314 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:56,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:51:56,318 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:51:56,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-09 09:51:56,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:56,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-09 09:51:56,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:51:56,712 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-09 09:51:56,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500411589] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:56,713 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:51:56,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-11-09 09:51:56,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829297478] [2021-11-09 09:51:56,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:51:56,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:56,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:51:56,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=120, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:51:56,715 INFO L87 Difference]: Start difference. First operand 57 states and 65 transitions. Second operand has 15 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 14 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:56,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:56,896 INFO L93 Difference]: Finished difference Result 169 states and 190 transitions. [2021-11-09 09:51:56,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-09 09:51:56,897 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 14 states have internal predecessors, (49), 0 states have call successors, (0), 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 42 [2021-11-09 09:51:56,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:56,898 INFO L225 Difference]: With dead ends: 169 [2021-11-09 09:51:56,899 INFO L226 Difference]: Without dead ends: 125 [2021-11-09 09:51:56,899 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=120, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:51:56,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-09 09:51:56,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 59. [2021-11-09 09:51:56,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 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) [2021-11-09 09:51:56,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2021-11-09 09:51:56,909 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 42 [2021-11-09 09:51:56,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:56,909 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2021-11-09 09:51:56,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 14 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:56,910 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2021-11-09 09:51:56,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-09 09:51:56,910 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:56,911 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:51:56,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-09 09:51:57,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:57,125 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:57,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:57,125 INFO L85 PathProgramCache]: Analyzing trace with hash 1800524353, now seen corresponding path program 2 times [2021-11-09 09:51:57,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:57,126 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260187675] [2021-11-09 09:51:57,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:57,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:57,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:57,271 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-09 09:51:57,271 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:57,272 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260187675] [2021-11-09 09:51:57,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [260187675] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:57,272 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204513509] [2021-11-09 09:51:57,272 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:51:57,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:57,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:51:57,278 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:51:57,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-09 09:51:57,446 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:51:57,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:51:57,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-09 09:51:57,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:51:57,742 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-09 09:51:57,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1204513509] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:57,743 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:51:57,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-11-09 09:51:57,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606166887] [2021-11-09 09:51:57,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-09 09:51:57,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:57,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-09 09:51:57,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=157, Unknown=0, NotChecked=0, Total=272 [2021-11-09 09:51:57,747 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 16 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:57,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:57,946 INFO L93 Difference]: Finished difference Result 183 states and 205 transitions. [2021-11-09 09:51:57,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-09 09:51:57,947 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 16 states have internal predecessors, (53), 0 states have call successors, (0), 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 44 [2021-11-09 09:51:57,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:57,948 INFO L225 Difference]: With dead ends: 183 [2021-11-09 09:51:57,948 INFO L226 Difference]: Without dead ends: 139 [2021-11-09 09:51:57,949 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=115, Invalid=157, Unknown=0, NotChecked=0, Total=272 [2021-11-09 09:51:57,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-09 09:51:57,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 61. [2021-11-09 09:51:57,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.15) internal successors, (69), 60 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:57,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 69 transitions. [2021-11-09 09:51:57,964 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 69 transitions. Word has length 44 [2021-11-09 09:51:57,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:57,964 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 69 transitions. [2021-11-09 09:51:57,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 16 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:57,965 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 69 transitions. [2021-11-09 09:51:57,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-09 09:51:57,968 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:57,968 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:51:58,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-09 09:51:58,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-09 09:51:58,182 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:58,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:58,183 INFO L85 PathProgramCache]: Analyzing trace with hash 221719619, now seen corresponding path program 3 times [2021-11-09 09:51:58,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:58,183 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790369062] [2021-11-09 09:51:58,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:58,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:58,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:58,338 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-09 09:51:58,338 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:58,339 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790369062] [2021-11-09 09:51:58,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790369062] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:58,339 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291073970] [2021-11-09 09:51:58,339 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:51:58,339 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:58,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:51:58,342 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:51:58,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-09 09:51:58,544 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-09 09:51:58,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:51:58,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-09 09:51:58,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:51:58,802 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-09 09:51:58,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291073970] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:58,803 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:51:58,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 13 [2021-11-09 09:51:58,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883162653] [2021-11-09 09:51:58,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-09 09:51:58,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:51:58,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-09 09:51:58,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=108, Unknown=0, NotChecked=0, Total=182 [2021-11-09 09:51:58,806 INFO L87 Difference]: Start difference. First operand 61 states and 69 transitions. Second operand has 14 states, 14 states have (on average 4.785714285714286) internal successors, (67), 13 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) [2021-11-09 09:51:59,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:51:59,314 INFO L93 Difference]: Finished difference Result 268 states and 299 transitions. [2021-11-09 09:51:59,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-09 09:51:59,315 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.785714285714286) internal successors, (67), 13 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 46 [2021-11-09 09:51:59,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:51:59,317 INFO L225 Difference]: With dead ends: 268 [2021-11-09 09:51:59,318 INFO L226 Difference]: Without dead ends: 224 [2021-11-09 09:51:59,319 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=478, Unknown=0, NotChecked=0, Total=756 [2021-11-09 09:51:59,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-09 09:51:59,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 76. [2021-11-09 09:51:59,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.1333333333333333) internal successors, (85), 75 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:51:59,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 85 transitions. [2021-11-09 09:51:59,332 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 85 transitions. Word has length 46 [2021-11-09 09:51:59,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:51:59,333 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 85 transitions. [2021-11-09 09:51:59,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.785714285714286) internal successors, (67), 13 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) [2021-11-09 09:51:59,334 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 85 transitions. [2021-11-09 09:51:59,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-09 09:51:59,334 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:51:59,335 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:51:59,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-09 09:51:59,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-09 09:51:59,559 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:51:59,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:51:59,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1561519059, now seen corresponding path program 4 times [2021-11-09 09:51:59,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:51:59,559 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267109916] [2021-11-09 09:51:59,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:51:59,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:51:59,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:51:59,729 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-09 09:51:59,730 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:51:59,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267109916] [2021-11-09 09:51:59,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267109916] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:51:59,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865107910] [2021-11-09 09:51:59,730 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:51:59,731 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:51:59,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:51:59,733 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:51:59,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-09 09:51:59,918 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:51:59,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:51:59,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-09 09:51:59,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:00,339 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-09 09:52:00,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865107910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:00,340 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:00,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 18 [2021-11-09 09:52:00,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918923011] [2021-11-09 09:52:00,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-09 09:52:00,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:00,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-09 09:52:00,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:52:00,343 INFO L87 Difference]: Start difference. First operand 76 states and 85 transitions. Second operand has 18 states, 18 states have (on average 4.055555555555555) internal successors, (73), 18 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:01,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:01,143 INFO L93 Difference]: Finished difference Result 295 states and 322 transitions. [2021-11-09 09:52:01,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-09 09:52:01,144 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.055555555555555) internal successors, (73), 18 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-09 09:52:01,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:01,148 INFO L225 Difference]: With dead ends: 295 [2021-11-09 09:52:01,149 INFO L226 Difference]: Without dead ends: 238 [2021-11-09 09:52:01,150 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=499, Invalid=1141, Unknown=0, NotChecked=0, Total=1640 [2021-11-09 09:52:01,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-11-09 09:52:01,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 82. [2021-11-09 09:52:01,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.1358024691358024) internal successors, (92), 81 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:01,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 92 transitions. [2021-11-09 09:52:01,166 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 92 transitions. Word has length 51 [2021-11-09 09:52:01,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:01,166 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 92 transitions. [2021-11-09 09:52:01,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.055555555555555) internal successors, (73), 18 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:01,167 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 92 transitions. [2021-11-09 09:52:01,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-09 09:52:01,167 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:01,168 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:01,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:01,392 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-09 09:52:01,392 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:52:01,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:01,393 INFO L85 PathProgramCache]: Analyzing trace with hash 658499951, now seen corresponding path program 1 times [2021-11-09 09:52:01,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:01,393 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201279753] [2021-11-09 09:52:01,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:01,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:01,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:01,583 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-09 09:52:01,584 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:01,584 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201279753] [2021-11-09 09:52:01,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [201279753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:01,584 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739434958] [2021-11-09 09:52:01,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:01,585 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:01,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:01,586 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:01,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-09 09:52:01,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:01,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-09 09:52:01,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:02,245 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-09 09:52:02,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739434958] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:02,246 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:02,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2021-11-09 09:52:02,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99067568] [2021-11-09 09:52:02,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-09 09:52:02,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:02,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-09 09:52:02,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=298, Unknown=0, NotChecked=0, Total=506 [2021-11-09 09:52:02,249 INFO L87 Difference]: Start difference. First operand 82 states and 92 transitions. Second operand has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 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) [2021-11-09 09:52:02,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:02,544 INFO L93 Difference]: Finished difference Result 256 states and 284 transitions. [2021-11-09 09:52:02,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-09 09:52:02,545 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 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 55 [2021-11-09 09:52:02,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:02,547 INFO L225 Difference]: With dead ends: 256 [2021-11-09 09:52:02,547 INFO L226 Difference]: Without dead ends: 195 [2021-11-09 09:52:02,548 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=208, Invalid=298, Unknown=0, NotChecked=0, Total=506 [2021-11-09 09:52:02,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-09 09:52:02,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 84. [2021-11-09 09:52:02,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.1325301204819278) internal successors, (94), 83 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:02,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 94 transitions. [2021-11-09 09:52:02,562 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 94 transitions. Word has length 55 [2021-11-09 09:52:02,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:02,563 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 94 transitions. [2021-11-09 09:52:02,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 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) [2021-11-09 09:52:02,564 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 94 transitions. [2021-11-09 09:52:02,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-09 09:52:02,564 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:02,565 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:02,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:02,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-09 09:52:02,790 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:52:02,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:02,791 INFO L85 PathProgramCache]: Analyzing trace with hash 1472305709, now seen corresponding path program 2 times [2021-11-09 09:52:02,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:02,791 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042571728] [2021-11-09 09:52:02,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:02,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:02,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:03,000 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-09 09:52:03,000 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:03,000 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042571728] [2021-11-09 09:52:03,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042571728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:03,001 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019643908] [2021-11-09 09:52:03,001 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 09:52:03,001 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:03,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:03,003 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:03,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-09 09:52:03,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 09:52:03,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:52:03,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-09 09:52:03,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:03,764 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-09 09:52:03,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019643908] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:03,765 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:03,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2021-11-09 09:52:03,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119734333] [2021-11-09 09:52:03,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-09 09:52:03,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:03,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-09 09:52:03,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=355, Unknown=0, NotChecked=0, Total=600 [2021-11-09 09:52:03,768 INFO L87 Difference]: Start difference. First operand 84 states and 94 transitions. Second operand has 25 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:04,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:04,110 INFO L93 Difference]: Finished difference Result 270 states and 299 transitions. [2021-11-09 09:52:04,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-09 09:52:04,111 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 0 states have call successors, (0), 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 57 [2021-11-09 09:52:04,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:04,113 INFO L225 Difference]: With dead ends: 270 [2021-11-09 09:52:04,114 INFO L226 Difference]: Without dead ends: 209 [2021-11-09 09:52:04,115 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=245, Invalid=355, Unknown=0, NotChecked=0, Total=600 [2021-11-09 09:52:04,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-09 09:52:04,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 86. [2021-11-09 09:52:04,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1294117647058823) internal successors, (96), 85 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:04,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 96 transitions. [2021-11-09 09:52:04,129 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 96 transitions. Word has length 57 [2021-11-09 09:52:04,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:04,130 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 96 transitions. [2021-11-09 09:52:04,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:04,131 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 96 transitions. [2021-11-09 09:52:04,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-09 09:52:04,132 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:04,132 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:04,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:04,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-09 09:52:04,346 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:52:04,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:04,347 INFO L85 PathProgramCache]: Analyzing trace with hash 1855591275, now seen corresponding path program 3 times [2021-11-09 09:52:04,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:04,347 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898459555] [2021-11-09 09:52:04,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:04,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:04,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:04,596 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-09 09:52:04,596 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:04,596 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898459555] [2021-11-09 09:52:04,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898459555] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:04,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586616124] [2021-11-09 09:52:04,597 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 09:52:04,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:04,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:04,599 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:04,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-09 09:52:04,901 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-09 09:52:04,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:52:04,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-09 09:52:04,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:05,221 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-11-09 09:52:05,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [586616124] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:05,221 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:05,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5] total 17 [2021-11-09 09:52:05,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670287368] [2021-11-09 09:52:05,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-09 09:52:05,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:05,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-09 09:52:05,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=200, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:52:05,224 INFO L87 Difference]: Start difference. First operand 86 states and 96 transitions. Second operand has 18 states, 18 states have (on average 3.888888888888889) internal successors, (70), 17 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) [2021-11-09 09:52:05,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:05,710 INFO L93 Difference]: Finished difference Result 305 states and 342 transitions. [2021-11-09 09:52:05,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-09 09:52:05,710 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.888888888888889) internal successors, (70), 17 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 59 [2021-11-09 09:52:05,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:05,713 INFO L225 Difference]: With dead ends: 305 [2021-11-09 09:52:05,713 INFO L226 Difference]: Without dead ends: 244 [2021-11-09 09:52:05,714 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=271, Invalid=541, Unknown=0, NotChecked=0, Total=812 [2021-11-09 09:52:05,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-09 09:52:05,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 99. [2021-11-09 09:52:05,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.1428571428571428) internal successors, (112), 98 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:05,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 112 transitions. [2021-11-09 09:52:05,729 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 112 transitions. Word has length 59 [2021-11-09 09:52:05,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:05,730 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 112 transitions. [2021-11-09 09:52:05,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.888888888888889) internal successors, (70), 17 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) [2021-11-09 09:52:05,730 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 112 transitions. [2021-11-09 09:52:05,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-09 09:52:05,731 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:05,731 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:05,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:05,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-09 09:52:05,958 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:52:05,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:05,959 INFO L85 PathProgramCache]: Analyzing trace with hash -736007971, now seen corresponding path program 4 times [2021-11-09 09:52:05,959 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:05,959 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055710062] [2021-11-09 09:52:05,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:05,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:06,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:06,205 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-09 09:52:06,205 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:06,205 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055710062] [2021-11-09 09:52:06,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055710062] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:06,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258250111] [2021-11-09 09:52:06,206 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 09:52:06,206 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:06,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:06,210 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:06,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-09 09:52:06,502 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 09:52:06,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:52:06,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-09 09:52:06,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:07,030 INFO L354 Elim1Store]: treesize reduction 76, result has 20.8 percent of original size [2021-11-09 09:52:07,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 38 [2021-11-09 09:52:17,207 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [ULTIMATE.start_main_~i~1] [2021-11-09 09:52:17,207 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-09 09:52:17,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-11-09 09:52:17,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655835392] [2021-11-09 09:52:17,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-09 09:52:17,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:17,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-09 09:52:17,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=414, Unknown=4, NotChecked=0, Total=552 [2021-11-09 09:52:17,210 INFO L87 Difference]: Start difference. First operand 99 states and 112 transitions. Second operand has 16 states, 16 states have (on average 3.3125) internal successors, (53), 15 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:17,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:17,752 INFO L93 Difference]: Finished difference Result 320 states and 357 transitions. [2021-11-09 09:52:17,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-09 09:52:17,753 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.3125) internal successors, (53), 15 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-09 09:52:17,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:17,757 INFO L225 Difference]: With dead ends: 320 [2021-11-09 09:52:17,757 INFO L226 Difference]: Without dead ends: 248 [2021-11-09 09:52:17,758 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=326, Invalid=930, Unknown=4, NotChecked=0, Total=1260 [2021-11-09 09:52:17,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-11-09 09:52:17,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 101. [2021-11-09 09:52:17,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 100 states have (on average 1.14) internal successors, (114), 100 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:17,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 114 transitions. [2021-11-09 09:52:17,773 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 114 transitions. Word has length 67 [2021-11-09 09:52:17,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:17,775 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 114 transitions. [2021-11-09 09:52:17,776 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.3125) internal successors, (53), 15 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:17,776 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 114 transitions. [2021-11-09 09:52:17,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-09 09:52:17,784 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:17,785 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:17,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:17,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-09 09:52:17,998 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:52:17,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:17,999 INFO L85 PathProgramCache]: Analyzing trace with hash 1692003483, now seen corresponding path program 5 times [2021-11-09 09:52:17,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:17,999 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581732209] [2021-11-09 09:52:17,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:17,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:18,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:18,275 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-09 09:52:18,275 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:18,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581732209] [2021-11-09 09:52:18,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581732209] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:18,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509031727] [2021-11-09 09:52:18,276 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 09:52:18,276 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:18,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:18,278 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:18,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-09 09:52:20,798 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-11-09 09:52:20,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:52:20,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-09 09:52:20,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:21,234 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-09 09:52:21,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509031727] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:21,235 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:21,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 6] total 20 [2021-11-09 09:52:21,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331714135] [2021-11-09 09:52:21,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-09 09:52:21,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:21,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-09 09:52:21,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=279, Unknown=0, NotChecked=0, Total=420 [2021-11-09 09:52:21,237 INFO L87 Difference]: Start difference. First operand 101 states and 114 transitions. Second operand has 21 states, 21 states have (on average 3.8095238095238093) internal successors, (80), 20 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:21,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:21,841 INFO L93 Difference]: Finished difference Result 355 states and 400 transitions. [2021-11-09 09:52:21,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-09 09:52:21,842 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.8095238095238093) internal successors, (80), 20 states have internal predecessors, (80), 0 states have call successors, (0), 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 69 [2021-11-09 09:52:21,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:21,844 INFO L225 Difference]: With dead ends: 355 [2021-11-09 09:52:21,845 INFO L226 Difference]: Without dead ends: 283 [2021-11-09 09:52:21,846 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=362, Invalid=760, Unknown=0, NotChecked=0, Total=1122 [2021-11-09 09:52:21,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-11-09 09:52:21,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 114. [2021-11-09 09:52:21,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.1504424778761062) internal successors, (130), 113 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:21,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 130 transitions. [2021-11-09 09:52:21,863 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 130 transitions. Word has length 69 [2021-11-09 09:52:21,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:21,864 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 130 transitions. [2021-11-09 09:52:21,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.8095238095238093) internal successors, (80), 20 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 09:52:21,864 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 130 transitions. [2021-11-09 09:52:21,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-09 09:52:21,865 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:21,866 INFO L513 BasicCegarLoop]: trace histogram [14, 14, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:21,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:22,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:22,094 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 09:52:22,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:22,095 INFO L85 PathProgramCache]: Analyzing trace with hash 1525885069, now seen corresponding path program 6 times [2021-11-09 09:52:22,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:22,095 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [631405732] [2021-11-09 09:52:22,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:22,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:22,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:22,395 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-09 09:52:22,395 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:22,396 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [631405732] [2021-11-09 09:52:22,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [631405732] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:22,396 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731446098] [2021-11-09 09:52:22,396 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 09:52:22,396 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:22,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:22,402 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:22,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d83eced-029a-4cde-9561-e19c4b11098e/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-09 09:52:22,863 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-09 09:52:22,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 09:52:22,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-09 09:52:22,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:23,621 INFO L354 Elim1Store]: treesize reduction 70, result has 27.1 percent of original size [2021-11-09 09:52:23,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 41 [2021-11-09 09:52:36,039 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-09 09:52:36,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731446098] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:36,040 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:36,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11] total 26 [2021-11-09 09:52:36,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11772122] [2021-11-09 09:52:36,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-09 09:52:36,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:36,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-09 09:52:36,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=513, Unknown=4, NotChecked=0, Total=702 [2021-11-09 09:52:36,043 INFO L87 Difference]: Start difference. First operand 114 states and 130 transitions. Second operand has 27 states, 27 states have (on average 3.259259259259259) internal successors, (88), 26 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)