./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/skipped.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7e70badd Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-tiling/skipped.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G --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 0c36d485530e5f36dabf3b382821b7ad25023b1cbf4cb81b13349652fc8273f7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-7e70bad [2021-11-23 12:30:00,714 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 12:30:00,717 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 12:30:00,756 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 12:30:00,756 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 12:30:00,758 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 12:30:00,760 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 12:30:00,763 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 12:30:00,766 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 12:30:00,767 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 12:30:00,769 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 12:30:00,771 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 12:30:00,772 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 12:30:00,773 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 12:30:00,775 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 12:30:00,777 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 12:30:00,779 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 12:30:00,781 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 12:30:00,783 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 12:30:00,787 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 12:30:00,789 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 12:30:00,796 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 12:30:00,798 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 12:30:00,803 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 12:30:00,808 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 12:30:00,815 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 12:30:00,816 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 12:30:00,817 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 12:30:00,818 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 12:30:00,820 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 12:30:00,820 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 12:30:00,824 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 12:30:00,825 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 12:30:00,826 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 12:30:00,828 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 12:30:00,830 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 12:30:00,832 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 12:30:00,833 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 12:30:00,833 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 12:30:00,835 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 12:30:00,840 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 12:30:00,841 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-23 12:30:00,884 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 12:30:00,893 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 12:30:00,894 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 12:30:00,894 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 12:30:00,896 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 12:30:00,896 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 12:30:00,896 INFO L138 SettingsManager]: * Use SBE=true [2021-11-23 12:30:00,897 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 12:30:00,897 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 12:30:00,897 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 12:30:00,898 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 12:30:00,899 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 12:30:00,899 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 12:30:00,899 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 12:30:00,900 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 12:30:00,900 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 12:30:00,901 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 12:30:00,901 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 12:30:00,901 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 12:30:00,901 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 12:30:00,902 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 12:30:00,902 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 12:30:00,902 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 12:30:00,903 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 12:30:00,903 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 12:30:00,903 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 12:30:00,903 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-23 12:30:00,904 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 12:30:00,904 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-23 12:30:00,906 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-23 12:30:00,906 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 12:30:00,906 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 12:30:00,907 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_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0c36d485530e5f36dabf3b382821b7ad25023b1cbf4cb81b13349652fc8273f7 [2021-11-23 12:30:01,282 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 12:30:01,309 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 12:30:01,312 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 12:30:01,314 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 12:30:01,315 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 12:30:01,317 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/../../sv-benchmarks/c/array-tiling/skipped.c [2021-11-23 12:30:01,426 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/data/575a47c77/24b4428f6dca4a74872f887ede5b059a/FLAGca5c313b3 [2021-11-23 12:30:02,030 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 12:30:02,031 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/sv-benchmarks/c/array-tiling/skipped.c [2021-11-23 12:30:02,047 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/data/575a47c77/24b4428f6dca4a74872f887ede5b059a/FLAGca5c313b3 [2021-11-23 12:30:02,337 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/data/575a47c77/24b4428f6dca4a74872f887ede5b059a [2021-11-23 12:30:02,342 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 12:30:02,344 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 12:30:02,346 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 12:30:02,346 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 12:30:02,356 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 12:30:02,357 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,358 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64c92bcb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02, skipping insertion in model container [2021-11-23 12:30:02,359 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,366 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 12:30:02,384 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 12:30:02,593 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/sv-benchmarks/c/array-tiling/skipped.c[398,411] [2021-11-23 12:30:02,639 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 12:30:02,656 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 12:30:02,681 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/sv-benchmarks/c/array-tiling/skipped.c[398,411] [2021-11-23 12:30:02,706 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 12:30:02,727 INFO L208 MainTranslator]: Completed translation [2021-11-23 12:30:02,728 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02 WrapperNode [2021-11-23 12:30:02,729 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 12:30:02,730 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 12:30:02,730 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 12:30:02,731 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 12:30:02,740 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,763 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,790 INFO L137 Inliner]: procedures = 16, calls = 16, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 74 [2021-11-23 12:30:02,790 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 12:30:02,791 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 12:30:02,792 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 12:30:02,792 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 12:30:02,803 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,803 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,806 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,806 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,814 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,819 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,821 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,824 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 12:30:02,825 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 12:30:02,825 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 12:30:02,825 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 12:30:02,827 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (1/1) ... [2021-11-23 12:30:02,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 12:30:02,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:02,865 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 12:30:02,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 12:30:02,922 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 12:30:02,922 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 12:30:02,923 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 12:30:02,923 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 12:30:02,923 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 12:30:02,923 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 12:30:02,924 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 12:30:03,006 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 12:30:03,008 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 12:30:03,178 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 12:30:03,187 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 12:30:03,187 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-23 12:30:03,190 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 12:30:03 BoogieIcfgContainer [2021-11-23 12:30:03,190 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 12:30:03,192 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 12:30:03,193 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 12:30:03,206 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 12:30:03,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 12:30:02" (1/3) ... [2021-11-23 12:30:03,208 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f6d4803 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 12:30:03, skipping insertion in model container [2021-11-23 12:30:03,209 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 12:30:02" (2/3) ... [2021-11-23 12:30:03,209 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f6d4803 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 12:30:03, skipping insertion in model container [2021-11-23 12:30:03,210 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 12:30:03" (3/3) ... [2021-11-23 12:30:03,212 INFO L111 eAbstractionObserver]: Analyzing ICFG skipped.c [2021-11-23 12:30:03,224 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 12:30:03,225 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 12:30:03,283 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 12:30:03,292 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 [2021-11-23 12:30:03,293 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 12:30:03,311 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 23 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:03,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 12:30:03,318 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:03,319 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:03,320 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:03,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:03,327 INFO L85 PathProgramCache]: Analyzing trace with hash -1607783550, now seen corresponding path program 1 times [2021-11-23 12:30:03,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:03,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548748265] [2021-11-23 12:30:03,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:03,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:03,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:03,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:30:03,522 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:03,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548748265] [2021-11-23 12:30:03,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1548748265] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 12:30:03,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 12:30:03,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 12:30:03,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075332840] [2021-11-23 12:30:03,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 12:30:03,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 12:30:03,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:03,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 12:30:03,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 12:30:03,573 INFO L87 Difference]: Start difference. First operand has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 23 states have internal predecessors, (35), 0 states have call successors, (0), 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 2 states, 2 states have (on average 6.0) internal successors, (12), 2 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) [2021-11-23 12:30:03,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:03,592 INFO L93 Difference]: Finished difference Result 43 states and 62 transitions. [2021-11-23 12:30:03,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 12:30:03,595 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 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 [2021-11-23 12:30:03,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:03,605 INFO L225 Difference]: With dead ends: 43 [2021-11-23 12:30:03,605 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 12:30:03,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 12:30:03,614 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:03,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 12:30:03,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 12:30:03,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-23 12:30:03,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:03,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-23 12:30:03,656 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 12 [2021-11-23 12:30:03,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:03,657 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-23 12:30:03,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 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) [2021-11-23 12:30:03,658 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-23 12:30:03,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 12:30:03,659 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:03,659 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:03,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 12:30:03,660 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:03,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:03,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1872951298, now seen corresponding path program 1 times [2021-11-23 12:30:03,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:03,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659792016] [2021-11-23 12:30:03,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:03,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:03,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:03,756 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:30:03,757 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:03,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659792016] [2021-11-23 12:30:03,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659792016] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 12:30:03,758 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 12:30:03,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 12:30:03,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554051539] [2021-11-23 12:30:03,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 12:30:03,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 12:30:03,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:03,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 12:30:03,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 12:30:03,762 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 3 states, 3 states have (on average 4.0) 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) [2021-11-23 12:30:03,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:03,844 INFO L93 Difference]: Finished difference Result 37 states and 45 transitions. [2021-11-23 12:30:03,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 12:30:03,845 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) 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 [2021-11-23 12:30:03,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:03,846 INFO L225 Difference]: With dead ends: 37 [2021-11-23 12:30:03,846 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 12:30:03,847 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 12:30:03,849 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 1 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:03,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 27 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 12:30:03,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 12:30:03,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-11-23 12:30:03,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:03,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-23 12:30:03,857 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 12 [2021-11-23 12:30:03,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:03,858 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-23 12:30:03,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) 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) [2021-11-23 12:30:03,858 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-23 12:30:03,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 12:30:03,859 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:03,859 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:03,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 12:30:03,860 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:03,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:03,861 INFO L85 PathProgramCache]: Analyzing trace with hash -270152420, now seen corresponding path program 1 times [2021-11-23 12:30:03,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:03,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162054750] [2021-11-23 12:30:03,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:03,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:03,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:03,982 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:30:03,982 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:03,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162054750] [2021-11-23 12:30:03,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1162054750] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:03,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369888473] [2021-11-23 12:30:03,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:03,984 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:03,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:03,995 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:03,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 12:30:04,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:04,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 12:30:04,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:04,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:30:04,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:04,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:30:04,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369888473] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:04,409 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:04,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-23 12:30:04,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852662512] [2021-11-23 12:30:04,410 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:04,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 12:30:04,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:04,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 12:30:04,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-11-23 12:30:04,412 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 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) [2021-11-23 12:30:04,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:04,542 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-11-23 12:30:04,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 12:30:04,543 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 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 14 [2021-11-23 12:30:04,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:04,544 INFO L225 Difference]: With dead ends: 39 [2021-11-23 12:30:04,545 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 12:30:04,546 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-11-23 12:30:04,553 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 6 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:04,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 32 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 12:30:04,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 12:30:04,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-11-23 12:30:04,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:04,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-11-23 12:30:04,561 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 14 [2021-11-23 12:30:04,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:04,561 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-11-23 12:30:04,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 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) [2021-11-23 12:30:04,562 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-11-23 12:30:04,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 12:30:04,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:04,563 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:04,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:04,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:04,791 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:04,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:04,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1873689926, now seen corresponding path program 2 times [2021-11-23 12:30:04,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:04,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732936873] [2021-11-23 12:30:04,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:04,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:04,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:05,037 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 12:30:05,037 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:05,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732936873] [2021-11-23 12:30:05,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1732936873] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 12:30:05,040 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 12:30:05,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 12:30:05,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017972320] [2021-11-23 12:30:05,041 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 12:30:05,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 12:30:05,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:05,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 12:30:05,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 12:30:05,046 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 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) [2021-11-23 12:30:05,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:05,133 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2021-11-23 12:30:05,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 12:30:05,134 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 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 16 [2021-11-23 12:30:05,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:05,136 INFO L225 Difference]: With dead ends: 35 [2021-11-23 12:30:05,136 INFO L226 Difference]: Without dead ends: 28 [2021-11-23 12:30:05,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 12:30:05,148 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 40 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:05,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 18 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 12:30:05,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-23 12:30:05,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2021-11-23 12:30:05,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:05,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-23 12:30:05,158 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 16 [2021-11-23 12:30:05,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:05,159 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-23 12:30:05,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 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) [2021-11-23 12:30:05,159 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-23 12:30:05,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 12:30:05,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:05,160 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:05,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 12:30:05,161 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:05,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:05,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1095507628, now seen corresponding path program 1 times [2021-11-23 12:30:05,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:05,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575057217] [2021-11-23 12:30:05,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:05,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:05,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:05,591 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 12:30:05,592 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:05,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575057217] [2021-11-23 12:30:05,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575057217] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:05,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262331338] [2021-11-23 12:30:05,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:05,594 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:05,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:05,599 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:05,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 12:30:05,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:05,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 12:30:05,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:05,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 12:30:05,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2021-11-23 12:30:05,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:05,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:05,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 20 [2021-11-23 12:30:06,076 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 12:30:06,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 28 [2021-11-23 12:30:06,141 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 12:30:06,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:06,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2021-11-23 12:30:06,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-23 12:30:06,316 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 12:30:06,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262331338] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:06,324 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:06,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 6] total 14 [2021-11-23 12:30:06,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047556048] [2021-11-23 12:30:06,325 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:06,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 12:30:06,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:06,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 12:30:06,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2021-11-23 12:30:06,331 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:06,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:06,816 INFO L93 Difference]: Finished difference Result 79 states and 94 transitions. [2021-11-23 12:30:06,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 12:30:06,816 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-23 12:30:06,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:06,818 INFO L225 Difference]: With dead ends: 79 [2021-11-23 12:30:06,818 INFO L226 Difference]: Without dead ends: 77 [2021-11-23 12:30:06,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 32 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=433, Unknown=0, NotChecked=0, Total=600 [2021-11-23 12:30:06,820 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 136 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:06,821 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 92 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 12:30:06,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-23 12:30:06,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 45. [2021-11-23 12:30:06,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2954545454545454) internal successors, (57), 44 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) [2021-11-23 12:30:06,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 57 transitions. [2021-11-23 12:30:06,839 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 57 transitions. Word has length 21 [2021-11-23 12:30:06,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:06,840 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 57 transitions. [2021-11-23 12:30:06,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:06,841 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 57 transitions. [2021-11-23 12:30:06,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 12:30:06,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:06,844 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:06,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:07,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:07,055 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:07,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:07,056 INFO L85 PathProgramCache]: Analyzing trace with hash -415449258, now seen corresponding path program 1 times [2021-11-23 12:30:07,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:07,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280162523] [2021-11-23 12:30:07,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:07,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:07,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:07,260 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 12:30:07,260 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:07,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280162523] [2021-11-23 12:30:07,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [280162523] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:07,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762451415] [2021-11-23 12:30:07,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:07,261 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:07,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:07,263 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:07,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 12:30:07,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:07,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 12:30:07,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:07,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:07,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-23 12:30:07,582 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 12:30:07,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 28 [2021-11-23 12:30:07,621 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 12:30:07,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:07,773 INFO L354 Elim1Store]: treesize reduction 8, result has 38.5 percent of original size [2021-11-23 12:30:07,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 16 [2021-11-23 12:30:07,805 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 12:30:07,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762451415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:07,806 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:07,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 7] total 17 [2021-11-23 12:30:07,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39433806] [2021-11-23 12:30:07,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:07,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 12:30:07,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:07,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 12:30:07,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2021-11-23 12:30:07,810 INFO L87 Difference]: Start difference. First operand 45 states and 57 transitions. Second operand has 17 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 17 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) [2021-11-23 12:30:08,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:08,187 INFO L93 Difference]: Finished difference Result 86 states and 104 transitions. [2021-11-23 12:30:08,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 12:30:08,188 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 17 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) Word has length 21 [2021-11-23 12:30:08,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:08,190 INFO L225 Difference]: With dead ends: 86 [2021-11-23 12:30:08,190 INFO L226 Difference]: Without dead ends: 84 [2021-11-23 12:30:08,191 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=177, Invalid=473, Unknown=0, NotChecked=0, Total=650 [2021-11-23 12:30:08,192 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 100 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:08,192 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 81 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 12:30:08,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-23 12:30:08,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 39. [2021-11-23 12:30:08,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.263157894736842) internal successors, (48), 38 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:08,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 48 transitions. [2021-11-23 12:30:08,203 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 48 transitions. Word has length 21 [2021-11-23 12:30:08,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:08,204 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 48 transitions. [2021-11-23 12:30:08,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 17 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) [2021-11-23 12:30:08,204 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 48 transitions. [2021-11-23 12:30:08,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 12:30:08,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:08,206 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:08,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:08,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:08,429 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:08,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:08,430 INFO L85 PathProgramCache]: Analyzing trace with hash -952716724, now seen corresponding path program 1 times [2021-11-23 12:30:08,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:08,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745826575] [2021-11-23 12:30:08,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:08,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:08,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:08,689 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:30:08,689 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:08,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745826575] [2021-11-23 12:30:08,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745826575] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:08,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340424330] [2021-11-23 12:30:08,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:08,690 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:08,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:08,695 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:08,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 12:30:08,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:08,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 12:30:08,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:08,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 12:30:09,000 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 12:30:09,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:09,120 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-23 12:30:09,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2021-11-23 12:30:09,158 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 12:30:09,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340424330] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:09,159 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:09,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 8] total 14 [2021-11-23 12:30:09,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62061347] [2021-11-23 12:30:09,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:09,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 12:30:09,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:09,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 12:30:09,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-23 12:30:09,162 INFO L87 Difference]: Start difference. First operand 39 states and 48 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 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) [2021-11-23 12:30:09,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:09,397 INFO L93 Difference]: Finished difference Result 53 states and 62 transitions. [2021-11-23 12:30:09,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 12:30:09,397 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-23 12:30:09,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:09,398 INFO L225 Difference]: With dead ends: 53 [2021-11-23 12:30:09,399 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 12:30:09,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 6 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2021-11-23 12:30:09,400 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 43 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:09,401 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 62 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 12:30:09,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 12:30:09,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 30. [2021-11-23 12:30:09,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 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) [2021-11-23 12:30:09,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-11-23 12:30:09,408 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 25 [2021-11-23 12:30:09,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:09,409 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-11-23 12:30:09,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 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) [2021-11-23 12:30:09,410 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-11-23 12:30:09,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 12:30:09,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:09,411 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:09,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:09,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:09,639 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:09,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:09,639 INFO L85 PathProgramCache]: Analyzing trace with hash 1643646272, now seen corresponding path program 1 times [2021-11-23 12:30:09,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:09,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686528212] [2021-11-23 12:30:09,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:09,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:09,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:09,743 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 12:30:09,743 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:09,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686528212] [2021-11-23 12:30:09,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [686528212] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:09,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412862558] [2021-11-23 12:30:09,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:09,744 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:09,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:09,746 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:09,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 12:30:09,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:09,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 12:30:09,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:09,951 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 12:30:09,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:10,054 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 12:30:10,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [412862558] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:10,055 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:10,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-23 12:30:10,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212394482] [2021-11-23 12:30:10,055 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:10,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 12:30:10,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:10,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 12:30:10,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2021-11-23 12:30:10,057 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 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) [2021-11-23 12:30:10,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:10,270 INFO L93 Difference]: Finished difference Result 88 states and 104 transitions. [2021-11-23 12:30:10,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 12:30:10,271 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-23 12:30:10,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:10,272 INFO L225 Difference]: With dead ends: 88 [2021-11-23 12:30:10,272 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 12:30:10,273 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2021-11-23 12:30:10,274 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 92 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:10,274 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 67 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 12:30:10,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 12:30:10,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 32. [2021-11-23 12:30:10,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 31 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:10,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-11-23 12:30:10,286 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 29 [2021-11-23 12:30:10,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:10,286 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-11-23 12:30:10,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 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) [2021-11-23 12:30:10,287 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-11-23 12:30:10,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 12:30:10,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:10,288 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:10,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:10,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:10,489 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:10,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:10,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1334470626, now seen corresponding path program 2 times [2021-11-23 12:30:10,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:10,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463759164] [2021-11-23 12:30:10,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:10,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:10,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:10,729 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 12:30:10,729 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:10,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463759164] [2021-11-23 12:30:10,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [463759164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:10,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800345418] [2021-11-23 12:30:10,730 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 12:30:10,730 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:10,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:10,732 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:10,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 12:30:10,801 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 12:30:10,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:30:10,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 12:30:10,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:11,219 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 12:30:11,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:11,470 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 12:30:11,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800345418] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:11,471 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:11,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 9] total 24 [2021-11-23 12:30:11,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847569933] [2021-11-23 12:30:11,471 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:11,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 12:30:11,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:11,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 12:30:11,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=424, Unknown=0, NotChecked=0, Total=552 [2021-11-23 12:30:11,475 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 24 states, 24 states have (on average 3.0) internal successors, (72), 24 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:11,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:11,909 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-11-23 12:30:11,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 12:30:11,909 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0) internal successors, (72), 24 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-23 12:30:11,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:11,910 INFO L225 Difference]: With dead ends: 62 [2021-11-23 12:30:11,910 INFO L226 Difference]: Without dead ends: 49 [2021-11-23 12:30:11,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=220, Invalid=772, Unknown=0, NotChecked=0, Total=992 [2021-11-23 12:30:11,912 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 182 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:11,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 64 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 12:30:11,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-23 12:30:11,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 37. [2021-11-23 12:30:11,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 36 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) [2021-11-23 12:30:11,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-11-23 12:30:11,921 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 31 [2021-11-23 12:30:11,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:11,921 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-11-23 12:30:11,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.0) internal successors, (72), 24 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:11,922 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-11-23 12:30:11,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 12:30:11,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:11,923 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:11,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:12,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-23 12:30:12,147 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:12,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:12,147 INFO L85 PathProgramCache]: Analyzing trace with hash 1713959812, now seen corresponding path program 3 times [2021-11-23 12:30:12,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:12,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802933767] [2021-11-23 12:30:12,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:12,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:12,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:12,490 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 12:30:12,490 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:12,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1802933767] [2021-11-23 12:30:12,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1802933767] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:12,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487983882] [2021-11-23 12:30:12,491 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 12:30:12,491 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:12,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:12,495 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:12,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 12:30:12,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 12:30:12,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:30:12,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 12:30:12,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:12,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 12:30:12,708 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-23 12:30:12,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 12:30:12,975 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 12:30:12,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 28 [2021-11-23 12:30:13,012 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 12:30:13,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:13,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 19 [2021-11-23 12:30:13,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-23 12:30:13,276 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 12:30:13,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487983882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:13,277 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:13,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 9] total 23 [2021-11-23 12:30:13,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523157489] [2021-11-23 12:30:13,277 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:13,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 12:30:13,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:13,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 12:30:13,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-11-23 12:30:13,279 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 23 states, 23 states have (on average 3.260869565217391) internal successors, (75), 23 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:14,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:14,869 INFO L93 Difference]: Finished difference Result 195 states and 232 transitions. [2021-11-23 12:30:14,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 12:30:14,870 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.260869565217391) internal successors, (75), 23 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-23 12:30:14,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:14,871 INFO L225 Difference]: With dead ends: 195 [2021-11-23 12:30:14,872 INFO L226 Difference]: Without dead ends: 167 [2021-11-23 12:30:14,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 676 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=355, Invalid=2195, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 12:30:14,875 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 250 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:14,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [250 Valid, 214 Invalid, 718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 12:30:14,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-23 12:30:14,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 62. [2021-11-23 12:30:14,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.2459016393442623) internal successors, (76), 61 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:14,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 76 transitions. [2021-11-23 12:30:14,890 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 76 transitions. Word has length 36 [2021-11-23 12:30:14,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:14,890 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 76 transitions. [2021-11-23 12:30:14,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.260869565217391) internal successors, (75), 23 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:14,890 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 76 transitions. [2021-11-23 12:30:14,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 12:30:14,892 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:14,892 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:14,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:15,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 12:30:15,107 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:15,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:15,107 INFO L85 PathProgramCache]: Analyzing trace with hash -135300444, now seen corresponding path program 1 times [2021-11-23 12:30:15,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:15,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583926313] [2021-11-23 12:30:15,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:15,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:15,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:16,048 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:30:16,048 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:16,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583926313] [2021-11-23 12:30:16,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583926313] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:16,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40588286] [2021-11-23 12:30:16,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:16,049 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:16,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:16,050 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:16,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 12:30:16,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:16,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 12:30:16,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:16,333 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-23 12:30:16,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 12:30:16,603 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 12:30:16,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 28 [2021-11-23 12:30:16,645 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 12:30:16,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:16,989 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-23 12:30:16,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2021-11-23 12:30:17,040 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 12:30:17,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40588286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:17,041 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:17,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 12, 10] total 34 [2021-11-23 12:30:17,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354484085] [2021-11-23 12:30:17,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:17,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 12:30:17,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:17,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 12:30:17,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=993, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 12:30:17,043 INFO L87 Difference]: Start difference. First operand 62 states and 76 transitions. Second operand has 34 states, 34 states have (on average 2.588235294117647) internal successors, (88), 34 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:21,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:21,314 INFO L93 Difference]: Finished difference Result 409 states and 489 transitions. [2021-11-23 12:30:21,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-11-23 12:30:21,314 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.588235294117647) internal successors, (88), 34 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-23 12:30:21,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:21,317 INFO L225 Difference]: With dead ends: 409 [2021-11-23 12:30:21,317 INFO L226 Difference]: Without dead ends: 312 [2021-11-23 12:30:21,326 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 61 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4009 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1896, Invalid=11214, Unknown=0, NotChecked=0, Total=13110 [2021-11-23 12:30:21,327 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 545 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 870 mSolverCounterSat, 419 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 545 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 1289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 419 IncrementalHoareTripleChecker+Valid, 870 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:21,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [545 Valid, 251 Invalid, 1289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [419 Valid, 870 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 12:30:21,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-11-23 12:30:21,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 73. [2021-11-23 12:30:21,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.2361111111111112) internal successors, (89), 72 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:21,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 89 transitions. [2021-11-23 12:30:21,357 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 89 transitions. Word has length 38 [2021-11-23 12:30:21,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:21,358 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 89 transitions. [2021-11-23 12:30:21,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.588235294117647) internal successors, (88), 34 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:21,358 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 89 transitions. [2021-11-23 12:30:21,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 12:30:21,367 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:21,367 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:21,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:21,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:21,595 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:21,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:21,595 INFO L85 PathProgramCache]: Analyzing trace with hash -1279355238, now seen corresponding path program 1 times [2021-11-23 12:30:21,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:21,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566862918] [2021-11-23 12:30:21,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:21,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:21,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:22,688 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:30:22,688 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:22,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566862918] [2021-11-23 12:30:22,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566862918] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:22,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655353252] [2021-11-23 12:30:22,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:22,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:22,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:22,698 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:22,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 12:30:22,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:22,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 12:30:22,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:23,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 12:30:23,097 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 12:30:23,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:23,294 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-23 12:30:23,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2021-11-23 12:30:23,341 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 12:30:23,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1655353252] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:23,341 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:23,341 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 12, 11] total 35 [2021-11-23 12:30:23,342 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362833000] [2021-11-23 12:30:23,342 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:23,342 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 12:30:23,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:23,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 12:30:23,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1053, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 12:30:23,343 INFO L87 Difference]: Start difference. First operand 73 states and 89 transitions. Second operand has 35 states, 35 states have (on average 2.8) internal successors, (98), 35 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:25,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:25,531 INFO L93 Difference]: Finished difference Result 205 states and 251 transitions. [2021-11-23 12:30:25,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-23 12:30:25,531 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.8) internal successors, (98), 35 states have internal predecessors, (98), 0 states have call successors, (0), 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 [2021-11-23 12:30:25,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:25,533 INFO L225 Difference]: With dead ends: 205 [2021-11-23 12:30:25,533 INFO L226 Difference]: Without dead ends: 183 [2021-11-23 12:30:25,537 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1642 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=686, Invalid=5014, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 12:30:25,537 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 313 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 908 mSolverCounterSat, 261 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 1169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 261 IncrementalHoareTripleChecker+Valid, 908 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:25,537 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [313 Valid, 209 Invalid, 1169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [261 Valid, 908 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 12:30:25,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-23 12:30:25,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 63. [2021-11-23 12:30:25,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1774193548387097) internal successors, (73), 62 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) [2021-11-23 12:30:25,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2021-11-23 12:30:25,549 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 42 [2021-11-23 12:30:25,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:25,550 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2021-11-23 12:30:25,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.8) internal successors, (98), 35 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:25,550 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2021-11-23 12:30:25,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 12:30:25,551 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:25,551 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:25,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:25,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:25,779 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:25,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:25,779 INFO L85 PathProgramCache]: Analyzing trace with hash -135270640, now seen corresponding path program 2 times [2021-11-23 12:30:25,779 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:25,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917359240] [2021-11-23 12:30:25,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:25,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:25,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:25,925 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 19 proven. 29 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 12:30:25,925 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:25,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917359240] [2021-11-23 12:30:25,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917359240] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:25,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883125872] [2021-11-23 12:30:25,926 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 12:30:25,926 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:25,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:25,927 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:25,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 12:30:25,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 12:30:25,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:30:25,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 12:30:25,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:26,211 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 32 proven. 16 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 12:30:26,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:26,327 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 32 proven. 16 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 12:30:26,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883125872] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:26,328 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:26,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-23 12:30:26,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646327712] [2021-11-23 12:30:26,328 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:26,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 12:30:26,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:26,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 12:30:26,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2021-11-23 12:30:26,330 INFO L87 Difference]: Start difference. First operand 63 states and 73 transitions. Second operand has 20 states, 20 states have (on average 3.4) internal successors, (68), 20 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:26,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:26,592 INFO L93 Difference]: Finished difference Result 112 states and 130 transitions. [2021-11-23 12:30:26,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 12:30:26,592 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.4) internal successors, (68), 20 states have internal predecessors, (68), 0 states have call successors, (0), 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 [2021-11-23 12:30:26,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:26,593 INFO L225 Difference]: With dead ends: 112 [2021-11-23 12:30:26,593 INFO L226 Difference]: Without dead ends: 74 [2021-11-23 12:30:26,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=181, Invalid=521, Unknown=0, NotChecked=0, Total=702 [2021-11-23 12:30:26,594 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 164 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:26,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 93 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 12:30:26,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-23 12:30:26,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 49. [2021-11-23 12:30:26,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 48 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) [2021-11-23 12:30:26,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 55 transitions. [2021-11-23 12:30:26,604 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 55 transitions. Word has length 46 [2021-11-23 12:30:26,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:26,605 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 55 transitions. [2021-11-23 12:30:26,605 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.4) internal successors, (68), 20 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:26,605 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 55 transitions. [2021-11-23 12:30:26,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 12:30:26,606 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:26,606 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:26,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:26,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:26,819 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:26,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:26,819 INFO L85 PathProgramCache]: Analyzing trace with hash -1173702100, now seen corresponding path program 4 times [2021-11-23 12:30:26,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:26,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465926837] [2021-11-23 12:30:26,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:26,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:26,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:27,152 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 9 proven. 23 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 12:30:27,152 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:27,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465926837] [2021-11-23 12:30:27,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465926837] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:27,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327684608] [2021-11-23 12:30:27,153 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 12:30:27,153 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:27,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:27,154 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:27,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 12:30:27,211 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 12:30:27,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:30:27,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 12:30:27,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:27,747 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 32 proven. 7 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 12:30:27,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:28,122 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 32 proven. 7 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 12:30:28,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327684608] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:28,123 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:28,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 12] total 33 [2021-11-23 12:30:28,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324620180] [2021-11-23 12:30:28,123 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:28,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 12:30:28,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:28,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 12:30:28,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=843, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 12:30:28,125 INFO L87 Difference]: Start difference. First operand 49 states and 55 transitions. Second operand has 33 states, 33 states have (on average 3.242424242424242) internal successors, (107), 33 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:28,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:28,963 INFO L93 Difference]: Finished difference Result 81 states and 92 transitions. [2021-11-23 12:30:28,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 12:30:28,964 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.242424242424242) internal successors, (107), 33 states have internal predecessors, (107), 0 states have call successors, (0), 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 48 [2021-11-23 12:30:28,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:28,964 INFO L225 Difference]: With dead ends: 81 [2021-11-23 12:30:28,964 INFO L226 Difference]: Without dead ends: 60 [2021-11-23 12:30:28,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 587 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=385, Invalid=1685, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 12:30:28,966 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 226 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 644 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 644 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:28,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 145 Invalid, 708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 644 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 12:30:28,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-23 12:30:28,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-11-23 12:30:28,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.169811320754717) internal successors, (62), 53 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:28,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 62 transitions. [2021-11-23 12:30:28,976 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 62 transitions. Word has length 48 [2021-11-23 12:30:28,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:28,977 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 62 transitions. [2021-11-23 12:30:28,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.242424242424242) internal successors, (107), 33 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:28,977 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 62 transitions. [2021-11-23 12:30:28,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 12:30:28,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:28,978 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:29,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:29,202 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 12:30:29,203 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:29,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:29,203 INFO L85 PathProgramCache]: Analyzing trace with hash -49846830, now seen corresponding path program 5 times [2021-11-23 12:30:29,203 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:29,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886059714] [2021-11-23 12:30:29,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:29,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:29,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:29,591 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 12 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 12:30:29,591 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:29,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886059714] [2021-11-23 12:30:29,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886059714] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:29,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234736306] [2021-11-23 12:30:29,592 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 12:30:29,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:29,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:29,593 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:29,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 12:30:29,729 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 12:30:29,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:30:29,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 12:30:29,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:30,120 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 18 proven. 25 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 12:30:30,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:30,650 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 18 proven. 25 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 12:30:30,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234736306] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:30:30,651 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:30:30,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 12] total 34 [2021-11-23 12:30:30,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583708766] [2021-11-23 12:30:30,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:30:30,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 12:30:30,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:30:30,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 12:30:30,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=872, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 12:30:30,654 INFO L87 Difference]: Start difference. First operand 54 states and 62 transitions. Second operand has 34 states, 34 states have (on average 2.7058823529411766) internal successors, (92), 34 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:31,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:30:31,045 INFO L93 Difference]: Finished difference Result 106 states and 122 transitions. [2021-11-23 12:30:31,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 12:30:31,046 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.7058823529411766) internal successors, (92), 34 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-23 12:30:31,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:30:31,046 INFO L225 Difference]: With dead ends: 106 [2021-11-23 12:30:31,046 INFO L226 Difference]: Without dead ends: 66 [2021-11-23 12:30:31,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 542 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=374, Invalid=1186, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 12:30:31,048 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 147 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 12:30:31,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 89 Invalid, 382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 12:30:31,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-23 12:30:31,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 56. [2021-11-23 12:30:31,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.1636363636363636) internal successors, (64), 55 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:31,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 64 transitions. [2021-11-23 12:30:31,054 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 64 transitions. Word has length 53 [2021-11-23 12:30:31,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:30:31,055 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 64 transitions. [2021-11-23 12:30:31,055 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.7058823529411766) internal successors, (92), 34 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:30:31,055 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 64 transitions. [2021-11-23 12:30:31,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 12:30:31,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:30:31,056 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:30:31,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 12:30:31,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 12:30:31,268 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:30:31,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:30:31,269 INFO L85 PathProgramCache]: Analyzing trace with hash 1983674996, now seen corresponding path program 6 times [2021-11-23 12:30:31,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:30:31,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918929327] [2021-11-23 12:30:31,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:30:31,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:30:31,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:30:32,575 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 9 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:30:32,575 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:30:32,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918929327] [2021-11-23 12:30:32,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918929327] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:30:32,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466015358] [2021-11-23 12:30:32,576 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 12:30:32,576 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:30:32,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:30:32,580 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:30:32,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 12:30:32,802 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 12:30:32,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:30:32,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-23 12:30:32,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:30:33,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 12:30:33,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 36 [2021-11-23 12:30:33,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,349 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 12:30:33,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 39 [2021-11-23 12:30:33,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,475 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 12:30:33,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 58 [2021-11-23 12:30:33,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,708 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 12:30:33,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 10 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 69 treesize of output 77 [2021-11-23 12:30:33,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:30:33,940 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 12:30:33,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 15 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 101 treesize of output 103 [2021-11-23 12:30:35,070 INFO L354 Elim1Store]: treesize reduction 40, result has 34.4 percent of original size [2021-11-23 12:30:35,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 15 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 76 treesize of output 66 [2021-11-23 12:30:35,141 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 15 proven. 69 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 12:30:35,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:30:57,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 165 treesize of output 161 [2021-11-23 12:30:57,640 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-23 12:30:57,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42139 treesize of output 41803 [2021-11-23 12:33:06,871 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 12 proven. 38 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 12:33:06,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466015358] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:33:06,872 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:33:06,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 27, 22] total 64 [2021-11-23 12:33:06,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016392788] [2021-11-23 12:33:06,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:33:06,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-23 12:33:06,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:33:06,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-23 12:33:06,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=648, Invalid=3371, Unknown=13, NotChecked=0, Total=4032 [2021-11-23 12:33:06,876 INFO L87 Difference]: Start difference. First operand 56 states and 64 transitions. Second operand has 64 states, 64 states have (on average 2.25) internal successors, (144), 64 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:33:32,598 WARN L227 SmtUtils]: Spent 6.46s on a formula simplification. DAG size of input: 89 DAG size of output: 88 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 12:33:54,668 WARN L227 SmtUtils]: Spent 9.22s on a formula simplification. DAG size of input: 78 DAG size of output: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 12:34:16,536 WARN L227 SmtUtils]: Spent 10.71s on a formula simplification. DAG size of input: 82 DAG size of output: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 12:34:43,025 WARN L227 SmtUtils]: Spent 6.96s on a formula simplification. DAG size of input: 103 DAG size of output: 97 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 12:35:10,304 WARN L227 SmtUtils]: Spent 6.21s on a formula simplification. DAG size of input: 73 DAG size of output: 67 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 12:35:28,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:35:28,490 INFO L93 Difference]: Finished difference Result 271 states and 333 transitions. [2021-11-23 12:35:28,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-11-23 12:35:28,491 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.25) internal successors, (144), 64 states have internal predecessors, (144), 0 states have call successors, (0), 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 [2021-11-23 12:35:28,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:35:28,492 INFO L225 Difference]: With dead ends: 271 [2021-11-23 12:35:28,492 INFO L226 Difference]: Without dead ends: 210 [2021-11-23 12:35:28,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 84 SyntacticMatches, 21 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8793 ImplicationChecksByTransitivity, 163.3s TimeCoverageRelationStatistics Valid=3399, Invalid=20727, Unknown=54, NotChecked=0, Total=24180 [2021-11-23 12:35:28,502 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 807 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 1436 mSolverCounterSat, 458 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 807 SdHoareTripleChecker+Valid, 482 SdHoareTripleChecker+Invalid, 3777 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 458 IncrementalHoareTripleChecker+Valid, 1436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1883 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 12:35:28,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [807 Valid, 482 Invalid, 3777 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [458 Valid, 1436 Invalid, 0 Unknown, 1883 Unchecked, 1.5s Time] [2021-11-23 12:35:28,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-11-23 12:35:28,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 96. [2021-11-23 12:35:28,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.2526315789473683) internal successors, (119), 95 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:28,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 119 transitions. [2021-11-23 12:35:28,521 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 119 transitions. Word has length 55 [2021-11-23 12:35:28,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:35:28,521 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 119 transitions. [2021-11-23 12:35:28,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.25) internal successors, (144), 64 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:28,522 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 119 transitions. [2021-11-23 12:35:28,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 12:35:28,523 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:35:28,523 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:35:28,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 12:35:28,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 12:35:28,725 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:35:28,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:35:28,725 INFO L85 PathProgramCache]: Analyzing trace with hash 2124223606, now seen corresponding path program 2 times [2021-11-23 12:35:28,725 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:35:28,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335833805] [2021-11-23 12:35:28,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:35:28,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:35:28,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:35:30,100 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:35:30,100 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:35:30,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335833805] [2021-11-23 12:35:30,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335833805] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:35:30,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766738473] [2021-11-23 12:35:30,101 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 12:35:30,101 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:35:30,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:35:30,107 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:35:30,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 12:35:30,181 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 12:35:30,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:35:30,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 12:35:30,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:35:30,432 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-23 12:35:30,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 12:35:30,824 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 12:35:30,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 28 [2021-11-23 12:35:30,876 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 12:35:30,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:35:31,127 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-23 12:35:31,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2021-11-23 12:35:31,214 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 12:35:31,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766738473] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:35:31,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:35:31,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 15, 13] total 38 [2021-11-23 12:35:31,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560223581] [2021-11-23 12:35:31,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:35:31,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 12:35:31,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:35:31,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 12:35:31,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1251, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 12:35:31,217 INFO L87 Difference]: Start difference. First operand 96 states and 119 transitions. Second operand has 38 states, 38 states have (on average 3.1052631578947367) internal successors, (118), 38 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:35,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:35:35,660 INFO L93 Difference]: Finished difference Result 370 states and 482 transitions. [2021-11-23 12:35:35,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-23 12:35:35,661 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.1052631578947367) internal successors, (118), 38 states have internal predecessors, (118), 0 states have call successors, (0), 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 [2021-11-23 12:35:35,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:35:35,664 INFO L225 Difference]: With dead ends: 370 [2021-11-23 12:35:35,664 INFO L226 Difference]: Without dead ends: 368 [2021-11-23 12:35:35,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 99 SyntacticMatches, 3 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2635 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=1049, Invalid=8263, Unknown=0, NotChecked=0, Total=9312 [2021-11-23 12:35:35,670 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 551 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 1499 mSolverCounterSat, 451 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 551 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 1950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 451 IncrementalHoareTripleChecker+Valid, 1499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 12:35:35,671 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [551 Valid, 403 Invalid, 1950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [451 Valid, 1499 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-23 12:35:35,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2021-11-23 12:35:35,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 104. [2021-11-23 12:35:35,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.2524271844660195) internal successors, (129), 103 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:35,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 129 transitions. [2021-11-23 12:35:35,699 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 129 transitions. Word has length 55 [2021-11-23 12:35:35,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:35:35,699 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 129 transitions. [2021-11-23 12:35:35,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.1052631578947367) internal successors, (118), 38 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:35,700 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 129 transitions. [2021-11-23 12:35:35,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 12:35:35,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:35:35,701 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:35:35,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 12:35:35,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 12:35:35,915 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:35:35,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:35:35,915 INFO L85 PathProgramCache]: Analyzing trace with hash 828798828, now seen corresponding path program 3 times [2021-11-23 12:35:35,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:35:35,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886742317] [2021-11-23 12:35:35,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:35:35,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:35:35,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:35:37,004 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:35:37,004 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:35:37,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886742317] [2021-11-23 12:35:37,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886742317] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:35:37,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252064653] [2021-11-23 12:35:37,005 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 12:35:37,005 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:35:37,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:35:37,017 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:35:37,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 12:35:37,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 12:35:37,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:35:37,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 12:35:37,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:35:37,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 12:35:37,688 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 12:35:37,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:35:37,870 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-23 12:35:37,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2021-11-23 12:35:37,940 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 12:35:37,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252064653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:35:37,940 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:35:37,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 14, 14] total 37 [2021-11-23 12:35:37,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682253088] [2021-11-23 12:35:37,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:35:37,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 12:35:37,941 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:35:37,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 12:35:37,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1203, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 12:35:37,942 INFO L87 Difference]: Start difference. First operand 104 states and 129 transitions. Second operand has 37 states, 37 states have (on average 2.945945945945946) internal successors, (109), 37 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:43,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:35:43,263 INFO L93 Difference]: Finished difference Result 490 states and 658 transitions. [2021-11-23 12:35:43,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-23 12:35:43,265 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.945945945945946) internal successors, (109), 37 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-23 12:35:43,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:35:43,269 INFO L225 Difference]: With dead ends: 490 [2021-11-23 12:35:43,269 INFO L226 Difference]: Without dead ends: 488 [2021-11-23 12:35:43,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4172 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1552, Invalid=11788, Unknown=0, NotChecked=0, Total=13340 [2021-11-23 12:35:43,272 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 1103 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 1656 mSolverCounterSat, 927 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1103 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 2583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 927 IncrementalHoareTripleChecker+Valid, 1656 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 12:35:43,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1103 Valid, 271 Invalid, 2583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [927 Valid, 1656 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-23 12:35:43,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2021-11-23 12:35:43,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 91. [2021-11-23 12:35:43,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.2222222222222223) internal successors, (110), 90 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:43,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 110 transitions. [2021-11-23 12:35:43,299 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 110 transitions. Word has length 59 [2021-11-23 12:35:43,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:35:43,299 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 110 transitions. [2021-11-23 12:35:43,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.945945945945946) internal successors, (109), 37 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:43,300 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 110 transitions. [2021-11-23 12:35:43,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 12:35:43,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:35:43,301 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:35:43,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 12:35:43,526 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 12:35:43,527 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:35:43,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:35:43,527 INFO L85 PathProgramCache]: Analyzing trace with hash -1439230238, now seen corresponding path program 4 times [2021-11-23 12:35:43,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:35:43,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51945022] [2021-11-23 12:35:43,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:35:43,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:35:43,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:35:43,727 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 51 proven. 57 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 12:35:43,727 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:35:43,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51945022] [2021-11-23 12:35:43,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51945022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:35:43,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701042842] [2021-11-23 12:35:43,728 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 12:35:43,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:35:43,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:35:43,729 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:35:43,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 12:35:43,797 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 12:35:43,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:35:43,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 12:35:43,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:35:44,139 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 12:35:44,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:35:44,313 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 12:35:44,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701042842] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:35:44,314 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:35:44,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-23 12:35:44,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699984695] [2021-11-23 12:35:44,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:35:44,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 12:35:44,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:35:44,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 12:35:44,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=485, Unknown=0, NotChecked=0, Total=650 [2021-11-23 12:35:44,318 INFO L87 Difference]: Start difference. First operand 91 states and 110 transitions. Second operand has 26 states, 26 states have (on average 3.3846153846153846) 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) [2021-11-23 12:35:44,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:35:44,724 INFO L93 Difference]: Finished difference Result 252 states and 310 transitions. [2021-11-23 12:35:44,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 12:35:44,725 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.3846153846153846) 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) Word has length 63 [2021-11-23 12:35:44,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:35:44,727 INFO L225 Difference]: With dead ends: 252 [2021-11-23 12:35:44,728 INFO L226 Difference]: Without dead ends: 140 [2021-11-23 12:35:44,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=307, Invalid=953, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 12:35:44,730 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 256 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 12:35:44,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 116 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 340 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 12:35:44,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-23 12:35:44,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 93. [2021-11-23 12:35:44,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.2173913043478262) internal successors, (112), 92 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) [2021-11-23 12:35:44,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 112 transitions. [2021-11-23 12:35:44,762 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 112 transitions. Word has length 63 [2021-11-23 12:35:44,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:35:44,762 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 112 transitions. [2021-11-23 12:35:44,763 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.3846153846153846) 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) [2021-11-23 12:35:44,763 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 112 transitions. [2021-11-23 12:35:44,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 12:35:44,763 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:35:44,764 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:35:44,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 12:35:44,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:35:44,979 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:35:44,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:35:44,979 INFO L85 PathProgramCache]: Analyzing trace with hash -69449468, now seen corresponding path program 5 times [2021-11-23 12:35:44,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:35:44,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062934721] [2021-11-23 12:35:44,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:35:44,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:35:44,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:35:45,439 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 25 proven. 42 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 12:35:45,439 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:35:45,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062934721] [2021-11-23 12:35:45,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062934721] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:35:45,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380946383] [2021-11-23 12:35:45,440 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 12:35:45,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:35:45,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:35:45,442 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:35:45,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 12:35:45,776 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-23 12:35:45,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:35:45,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 12:35:45,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:35:46,298 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 36 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 12:35:46,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:35:47,209 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 49 proven. 18 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 12:35:47,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380946383] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:35:47,210 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:35:47,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 40 [2021-11-23 12:35:47,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979374795] [2021-11-23 12:35:47,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:35:47,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 12:35:47,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:35:47,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 12:35:47,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=1190, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 12:35:47,213 INFO L87 Difference]: Start difference. First operand 93 states and 112 transitions. Second operand has 40 states, 40 states have (on average 2.825) internal successors, (113), 40 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:47,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:35:47,952 INFO L93 Difference]: Finished difference Result 154 states and 186 transitions. [2021-11-23 12:35:47,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 12:35:47,953 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.825) internal successors, (113), 40 states have internal predecessors, (113), 0 states have call successors, (0), 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 65 [2021-11-23 12:35:47,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:35:47,954 INFO L225 Difference]: With dead ends: 154 [2021-11-23 12:35:47,954 INFO L226 Difference]: Without dead ends: 125 [2021-11-23 12:35:47,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 801 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=640, Invalid=1910, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 12:35:47,956 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 422 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 694 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 12:35:47,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [422 Valid, 116 Invalid, 694 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 12:35:47,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-23 12:35:47,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 100. [2021-11-23 12:35:47,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.2323232323232323) internal successors, (122), 99 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:47,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 122 transitions. [2021-11-23 12:35:47,976 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 122 transitions. Word has length 65 [2021-11-23 12:35:47,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:35:47,977 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 122 transitions. [2021-11-23 12:35:47,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.825) internal successors, (113), 40 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:47,977 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 122 transitions. [2021-11-23 12:35:47,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 12:35:47,977 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:35:47,978 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:35:47,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 12:35:48,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:35:48,178 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:35:48,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:35:48,179 INFO L85 PathProgramCache]: Analyzing trace with hash -1126331370, now seen corresponding path program 6 times [2021-11-23 12:35:48,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:35:48,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234844731] [2021-11-23 12:35:48,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:35:48,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:35:48,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:35:48,677 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 23 proven. 60 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 12:35:48,677 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:35:48,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234844731] [2021-11-23 12:35:48,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234844731] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:35:48,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690303387] [2021-11-23 12:35:48,678 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 12:35:48,678 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:35:48,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:35:48,683 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:35:48,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 12:35:48,866 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-23 12:35:48,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:35:48,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 12:35:48,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:35:49,372 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 34 proven. 49 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 12:35:49,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:35:50,068 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 34 proven. 49 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 12:35:50,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690303387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:35:50,068 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:35:50,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 15] total 43 [2021-11-23 12:35:50,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025284007] [2021-11-23 12:35:50,069 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:35:50,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 12:35:50,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:35:50,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 12:35:50,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=1422, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 12:35:50,071 INFO L87 Difference]: Start difference. First operand 100 states and 122 transitions. Second operand has 43 states, 43 states have (on average 2.7674418604651163) internal successors, (119), 43 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:50,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:35:50,579 INFO L93 Difference]: Finished difference Result 202 states and 246 transitions. [2021-11-23 12:35:50,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 12:35:50,579 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.7674418604651163) internal successors, (119), 43 states have internal predecessors, (119), 0 states have call successors, (0), 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 70 [2021-11-23 12:35:50,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:35:50,580 INFO L225 Difference]: With dead ends: 202 [2021-11-23 12:35:50,580 INFO L226 Difference]: Without dead ends: 116 [2021-11-23 12:35:50,581 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 927 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=568, Invalid=1882, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 12:35:50,582 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 287 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 12:35:50,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [287 Valid, 89 Invalid, 468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 389 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 12:35:50,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-23 12:35:50,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 102. [2021-11-23 12:35:50,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 101 states have (on average 1.2277227722772277) internal successors, (124), 101 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:50,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 124 transitions. [2021-11-23 12:35:50,601 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 124 transitions. Word has length 70 [2021-11-23 12:35:50,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:35:50,601 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 124 transitions. [2021-11-23 12:35:50,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.7674418604651163) internal successors, (119), 43 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:35:50,601 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 124 transitions. [2021-11-23 12:35:50,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-23 12:35:50,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:35:50,603 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 6, 6, 6, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:35:50,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 12:35:50,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-23 12:35:50,815 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:35:50,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:35:50,815 INFO L85 PathProgramCache]: Analyzing trace with hash -29093964, now seen corresponding path program 7 times [2021-11-23 12:35:50,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:35:50,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764385891] [2021-11-23 12:35:50,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:35:50,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:35:50,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:35:51,794 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 0 proven. 170 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:35:51,794 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:35:51,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764385891] [2021-11-23 12:35:51,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1764385891] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:35:51,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386268468] [2021-11-23 12:35:51,795 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 12:35:51,795 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:35:51,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:35:51,796 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:35:51,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 12:35:51,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:35:51,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 12:35:51,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:35:52,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 12:35:52,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 12:35:52,460 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-23 12:35:52,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:35:52,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 19 [2021-11-23 12:35:52,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-23 12:35:52,728 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-23 12:35:52,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386268468] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:35:52,728 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:35:52,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 15, 15] total 41 [2021-11-23 12:35:52,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052227551] [2021-11-23 12:35:52,729 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:35:52,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-23 12:35:52,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:35:52,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-23 12:35:52,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1494, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 12:35:52,730 INFO L87 Difference]: Start difference. First operand 102 states and 124 transitions. Second operand has 41 states, 41 states have (on average 3.3658536585365852) internal successors, (138), 41 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:12,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:36:12,430 INFO L93 Difference]: Finished difference Result 905 states and 1230 transitions. [2021-11-23 12:36:12,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 290 states. [2021-11-23 12:36:12,433 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.3658536585365852) internal successors, (138), 41 states have internal predecessors, (138), 0 states have call successors, (0), 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 72 [2021-11-23 12:36:12,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:36:12,438 INFO L225 Difference]: With dead ends: 905 [2021-11-23 12:36:12,439 INFO L226 Difference]: Without dead ends: 903 [2021-11-23 12:36:12,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 130 SyntacticMatches, 2 SemanticMatches, 319 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42062 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=5932, Invalid=96788, Unknown=0, NotChecked=0, Total=102720 [2021-11-23 12:36:12,453 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 3295 mSDsluCounter, 435 mSDsCounter, 0 mSdLazyCounter, 2576 mSolverCounterSat, 2853 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3295 SdHoareTripleChecker+Valid, 474 SdHoareTripleChecker+Invalid, 5429 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2853 IncrementalHoareTripleChecker+Valid, 2576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 12:36:12,453 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3295 Valid, 474 Invalid, 5429 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2853 Valid, 2576 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2021-11-23 12:36:12,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 903 states. [2021-11-23 12:36:12,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 903 to 118. [2021-11-23 12:36:12,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.2393162393162394) internal successors, (145), 117 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:12,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 145 transitions. [2021-11-23 12:36:12,494 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 145 transitions. Word has length 72 [2021-11-23 12:36:12,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:36:12,495 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 145 transitions. [2021-11-23 12:36:12,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.3658536585365852) internal successors, (138), 41 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:12,495 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 145 transitions. [2021-11-23 12:36:12,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-23 12:36:12,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:36:12,496 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 6, 6, 6, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:36:12,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 12:36:12,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:36:12,697 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:36:12,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:36:12,697 INFO L85 PathProgramCache]: Analyzing trace with hash -803080396, now seen corresponding path program 3 times [2021-11-23 12:36:12,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:36:12,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434596004] [2021-11-23 12:36:12,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:36:12,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:36:12,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:36:14,458 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 0 proven. 170 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:36:14,459 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:36:14,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434596004] [2021-11-23 12:36:14,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434596004] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:36:14,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903014674] [2021-11-23 12:36:14,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 12:36:14,459 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:36:14,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:36:14,460 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:36:14,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 12:36:14,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 12:36:14,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:36:14,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 12:36:14,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:36:15,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 12:36:15,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 12:36:15,843 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 12:36:15,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 28 [2021-11-23 12:36:15,888 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 12:36:15,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:36:16,149 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-23 12:36:16,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2021-11-23 12:36:16,361 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-23 12:36:16,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903014674] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:36:16,362 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:36:16,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 19, 16] total 51 [2021-11-23 12:36:16,362 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425015360] [2021-11-23 12:36:16,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:36:16,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 12:36:16,363 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:36:16,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 12:36:16,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=2325, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 12:36:16,365 INFO L87 Difference]: Start difference. First operand 118 states and 145 transitions. Second operand has 51 states, 51 states have (on average 3.196078431372549) internal successors, (163), 51 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:30,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:36:30,925 INFO L93 Difference]: Finished difference Result 1202 states and 1625 transitions. [2021-11-23 12:36:30,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 189 states. [2021-11-23 12:36:30,926 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.196078431372549) internal successors, (163), 51 states have internal predecessors, (163), 0 states have call successors, (0), 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 72 [2021-11-23 12:36:30,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:36:30,933 INFO L225 Difference]: With dead ends: 1202 [2021-11-23 12:36:30,933 INFO L226 Difference]: Without dead ends: 1200 [2021-11-23 12:36:30,939 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 126 SyntacticMatches, 4 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20074 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=4033, Invalid=52373, Unknown=0, NotChecked=0, Total=56406 [2021-11-23 12:36:30,940 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 2930 mSDsluCounter, 677 mSDsCounter, 0 mSdLazyCounter, 2971 mSolverCounterSat, 2485 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2930 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 5456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2485 IncrementalHoareTripleChecker+Valid, 2971 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-23 12:36:30,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2930 Valid, 725 Invalid, 5456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2485 Valid, 2971 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-23 12:36:30,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1200 states. [2021-11-23 12:36:30,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1200 to 126. [2021-11-23 12:36:30,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.24) internal successors, (155), 125 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:30,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 155 transitions. [2021-11-23 12:36:30,992 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 155 transitions. Word has length 72 [2021-11-23 12:36:30,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:36:30,992 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 155 transitions. [2021-11-23 12:36:30,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 3.196078431372549) internal successors, (163), 51 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:30,993 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 155 transitions. [2021-11-23 12:36:30,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 12:36:30,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:36:30,994 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:36:31,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 12:36:31,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-23 12:36:31,212 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:36:31,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:36:31,212 INFO L85 PathProgramCache]: Analyzing trace with hash 578767658, now seen corresponding path program 8 times [2021-11-23 12:36:31,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:36:31,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160182300] [2021-11-23 12:36:31,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:36:31,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:36:31,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:36:32,408 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:36:32,408 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:36:32,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160182300] [2021-11-23 12:36:32,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160182300] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:36:32,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352974581] [2021-11-23 12:36:32,412 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 12:36:32,412 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:36:32,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:36:32,413 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:36:32,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 12:36:32,483 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 12:36:32,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:36:32,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-23 12:36:32,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:36:33,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 12:36:33,286 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 195 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 12:36:33,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:36:33,546 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-23 12:36:33,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2021-11-23 12:36:33,636 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-23 12:36:33,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352974581] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:36:33,637 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:36:33,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 20, 17] total 48 [2021-11-23 12:36:33,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013553556] [2021-11-23 12:36:33,637 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:36:33,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 12:36:33,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:36:33,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 12:36:33,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=2083, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 12:36:33,639 INFO L87 Difference]: Start difference. First operand 126 states and 155 transitions. Second operand has 48 states, 48 states have (on average 3.2083333333333335) internal successors, (154), 48 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:53,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:36:53,161 INFO L93 Difference]: Finished difference Result 1748 states and 2393 transitions. [2021-11-23 12:36:53,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 277 states. [2021-11-23 12:36:53,162 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.2083333333333335) internal successors, (154), 48 states have internal predecessors, (154), 0 states have call successors, (0), 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 76 [2021-11-23 12:36:53,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:36:53,171 INFO L225 Difference]: With dead ends: 1748 [2021-11-23 12:36:53,171 INFO L226 Difference]: Without dead ends: 1746 [2021-11-23 12:36:53,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 133 SyntacticMatches, 2 SemanticMatches, 310 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38979 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=7424, Invalid=89608, Unknown=0, NotChecked=0, Total=97032 [2021-11-23 12:36:53,181 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 4741 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 2597 mSolverCounterSat, 3913 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4741 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 6510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3913 IncrementalHoareTripleChecker+Valid, 2597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 12:36:53,181 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4741 Valid, 390 Invalid, 6510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3913 Valid, 2597 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2021-11-23 12:36:53,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1746 states. [2021-11-23 12:36:53,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1746 to 110. [2021-11-23 12:36:53,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.2110091743119267) internal successors, (132), 109 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:53,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 132 transitions. [2021-11-23 12:36:53,270 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 132 transitions. Word has length 76 [2021-11-23 12:36:53,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:36:53,271 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 132 transitions. [2021-11-23 12:36:53,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.2083333333333335) internal successors, (154), 48 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:53,271 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 132 transitions. [2021-11-23 12:36:53,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 12:36:53,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:36:53,273 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:36:53,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 12:36:53,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 12:36:53,499 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:36:53,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:36:53,499 INFO L85 PathProgramCache]: Analyzing trace with hash -148644960, now seen corresponding path program 9 times [2021-11-23 12:36:53,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:36:53,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072010583] [2021-11-23 12:36:53,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:36:53,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:36:53,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:36:53,765 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 99 proven. 93 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 12:36:53,765 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:36:53,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072010583] [2021-11-23 12:36:53,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072010583] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:36:53,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854627109] [2021-11-23 12:36:53,766 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 12:36:53,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:36:53,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:36:53,767 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:36:53,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 12:36:54,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-23 12:36:54,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:36:54,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 12:36:54,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:36:54,552 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 128 proven. 64 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 12:36:54,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:36:54,743 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 128 proven. 64 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 12:36:54,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [854627109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:36:54,743 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:36:54,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-23 12:36:54,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980831457] [2021-11-23 12:36:54,744 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:36:54,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 12:36:54,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:36:54,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 12:36:54,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=747, Unknown=0, NotChecked=0, Total=992 [2021-11-23 12:36:54,745 INFO L87 Difference]: Start difference. First operand 110 states and 132 transitions. Second operand has 32 states, 32 states have (on average 3.375) internal successors, (108), 32 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:55,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:36:55,277 INFO L93 Difference]: Finished difference Result 301 states and 368 transitions. [2021-11-23 12:36:55,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 12:36:55,278 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.375) internal successors, (108), 32 states have internal predecessors, (108), 0 states have call successors, (0), 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 80 [2021-11-23 12:36:55,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:36:55,279 INFO L225 Difference]: With dead ends: 301 [2021-11-23 12:36:55,279 INFO L226 Difference]: Without dead ends: 163 [2021-11-23 12:36:55,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=466, Invalid=1514, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 12:36:55,281 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 448 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 448 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 12:36:55,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [448 Valid, 128 Invalid, 535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 12:36:55,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-23 12:36:55,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 112. [2021-11-23 12:36:55,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.2072072072072073) internal successors, (134), 111 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:55,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 134 transitions. [2021-11-23 12:36:55,325 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 134 transitions. Word has length 80 [2021-11-23 12:36:55,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:36:55,326 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 134 transitions. [2021-11-23 12:36:55,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.375) internal successors, (108), 32 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:55,326 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 134 transitions. [2021-11-23 12:36:55,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 12:36:55,327 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:36:55,328 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:36:55,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 12:36:55,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 12:36:55,531 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:36:55,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:36:55,531 INFO L85 PathProgramCache]: Analyzing trace with hash 497611198, now seen corresponding path program 10 times [2021-11-23 12:36:55,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:36:55,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1588876457] [2021-11-23 12:36:55,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:36:55,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:36:55,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:36:56,055 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 49 proven. 66 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-23 12:36:56,055 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:36:56,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1588876457] [2021-11-23 12:36:56,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1588876457] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:36:56,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21621954] [2021-11-23 12:36:56,055 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 12:36:56,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:36:56,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:36:56,056 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:36:56,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 12:36:56,116 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 12:36:56,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:36:56,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 12:36:56,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:36:57,192 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 128 proven. 34 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 12:36:57,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:36:57,860 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 128 proven. 34 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 12:36:57,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21621954] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:36:57,861 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:36:57,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 18] total 51 [2021-11-23 12:36:57,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271964464] [2021-11-23 12:36:57,862 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:36:57,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 12:36:57,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:36:57,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 12:36:57,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=492, Invalid=2058, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 12:36:57,863 INFO L87 Difference]: Start difference. First operand 112 states and 134 transitions. Second operand has 51 states, 51 states have (on average 3.4705882352941178) internal successors, (177), 51 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:59,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:36:59,234 INFO L93 Difference]: Finished difference Result 186 states and 223 transitions. [2021-11-23 12:36:59,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 12:36:59,234 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.4705882352941178) internal successors, (177), 51 states have internal predecessors, (177), 0 states have call successors, (0), 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 82 [2021-11-23 12:36:59,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:36:59,235 INFO L225 Difference]: With dead ends: 186 [2021-11-23 12:36:59,235 INFO L226 Difference]: Without dead ends: 149 [2021-11-23 12:36:59,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1546 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=832, Invalid=3998, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 12:36:59,236 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 327 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 1106 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 327 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 1184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 1106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 12:36:59,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [327 Valid, 220 Invalid, 1184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 1106 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 12:36:59,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-23 12:36:59,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 122. [2021-11-23 12:36:59,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.2231404958677685) internal successors, (148), 121 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:59,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 148 transitions. [2021-11-23 12:36:59,273 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 148 transitions. Word has length 82 [2021-11-23 12:36:59,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:36:59,273 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 148 transitions. [2021-11-23 12:36:59,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 3.4705882352941178) internal successors, (177), 51 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:36:59,274 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 148 transitions. [2021-11-23 12:36:59,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 12:36:59,275 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:36:59,275 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:36:59,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-23 12:36:59,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:36:59,499 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:36:59,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:36:59,499 INFO L85 PathProgramCache]: Analyzing trace with hash 109214196, now seen corresponding path program 11 times [2021-11-23 12:36:59,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:36:59,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225710844] [2021-11-23 12:36:59,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:36:59,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:36:59,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:37:00,209 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 39 proven. 97 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-23 12:37:00,209 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:37:00,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225710844] [2021-11-23 12:37:00,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1225710844] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:37:00,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065861153] [2021-11-23 12:37:00,210 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 12:37:00,210 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:37:00,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:37:00,211 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:37:00,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 12:37:00,965 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-23 12:37:00,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:37:00,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 12:37:00,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:37:01,596 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 55 proven. 81 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-23 12:37:01,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:37:02,563 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 55 proven. 81 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-23 12:37:02,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065861153] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:37:02,564 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:37:02,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 18] total 52 [2021-11-23 12:37:02,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402279676] [2021-11-23 12:37:02,564 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:37:02,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-23 12:37:02,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:37:02,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-23 12:37:02,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=547, Invalid=2105, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 12:37:02,566 INFO L87 Difference]: Start difference. First operand 122 states and 148 transitions. Second operand has 52 states, 52 states have (on average 2.8076923076923075) internal successors, (146), 52 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:37:03,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:37:03,259 INFO L93 Difference]: Finished difference Result 242 states and 294 transitions. [2021-11-23 12:37:03,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 12:37:03,260 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.8076923076923075) internal successors, (146), 52 states have internal predecessors, (146), 0 states have call successors, (0), 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 87 [2021-11-23 12:37:03,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:37:03,260 INFO L225 Difference]: With dead ends: 242 [2021-11-23 12:37:03,261 INFO L226 Difference]: Without dead ends: 138 [2021-11-23 12:37:03,261 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1412 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=804, Invalid=2736, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 12:37:03,262 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 453 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 453 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 12:37:03,262 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [453 Valid, 95 Invalid, 621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 498 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 12:37:03,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-23 12:37:03,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 124. [2021-11-23 12:37:03,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.2195121951219512) internal successors, (150), 123 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:37:03,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 150 transitions. [2021-11-23 12:37:03,296 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 150 transitions. Word has length 87 [2021-11-23 12:37:03,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:37:03,296 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 150 transitions. [2021-11-23 12:37:03,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.8076923076923075) internal successors, (146), 52 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:37:03,297 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 150 transitions. [2021-11-23 12:37:03,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-23 12:37:03,297 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:37:03,297 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 8, 8, 8, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:37:03,302 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 12:37:03,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 12:37:03,498 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:37:03,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:37:03,498 INFO L85 PathProgramCache]: Analyzing trace with hash -157555178, now seen corresponding path program 12 times [2021-11-23 12:37:03,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:37:03,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731762554] [2021-11-23 12:37:03,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:37:03,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:37:03,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:37:05,357 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 283 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:37:05,357 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:37:05,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731762554] [2021-11-23 12:37:05,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731762554] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:37:05,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814870745] [2021-11-23 12:37:05,358 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 12:37:05,358 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:37:05,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:37:05,359 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:37:05,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 12:37:06,406 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-11-23 12:37:06,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:37:06,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 12:37:06,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:37:07,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 12:37:09,425 INFO L354 Elim1Store]: treesize reduction 24, result has 54.7 percent of original size [2021-11-23 12:37:09,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 113 treesize of output 115 [2021-11-23 12:37:09,592 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 120 proven. 147 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 12:37:09,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:37:11,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 54 [2021-11-23 12:37:11,305 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-11-23 12:37:11,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 79 treesize of output 75 [2021-11-23 12:37:12,371 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 112 proven. 71 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-23 12:37:12,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814870745] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:37:12,371 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:37:12,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 30, 23] total 80 [2021-11-23 12:37:12,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520728595] [2021-11-23 12:37:12,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:37:12,392 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-23 12:37:12,392 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:37:12,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-23 12:37:12,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=627, Invalid=5693, Unknown=0, NotChecked=0, Total=6320 [2021-11-23 12:37:12,394 INFO L87 Difference]: Start difference. First operand 124 states and 150 transitions. Second operand has 80 states, 80 states have (on average 2.95) internal successors, (236), 80 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:37:16,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:37:16,806 INFO L93 Difference]: Finished difference Result 195 states and 230 transitions. [2021-11-23 12:37:16,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-23 12:37:16,807 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.95) internal successors, (236), 80 states have internal predecessors, (236), 0 states have call successors, (0), 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 89 [2021-11-23 12:37:16,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:37:16,808 INFO L225 Difference]: With dead ends: 195 [2021-11-23 12:37:16,808 INFO L226 Difference]: Without dead ends: 155 [2021-11-23 12:37:16,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4269 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=1712, Invalid=14038, Unknown=0, NotChecked=0, Total=15750 [2021-11-23 12:37:16,811 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 256 mSDsluCounter, 774 mSDsCounter, 0 mSdLazyCounter, 1110 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 799 SdHoareTripleChecker+Invalid, 1913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 1110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 701 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 12:37:16,812 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 799 Invalid, 1913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 1110 Invalid, 0 Unknown, 701 Unchecked, 0.8s Time] [2021-11-23 12:37:16,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-23 12:37:16,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 122. [2021-11-23 12:37:16,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.2148760330578512) internal successors, (147), 121 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:37:16,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 147 transitions. [2021-11-23 12:37:16,868 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 147 transitions. Word has length 89 [2021-11-23 12:37:16,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:37:16,869 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 147 transitions. [2021-11-23 12:37:16,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.95) internal successors, (236), 80 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:37:16,869 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 147 transitions. [2021-11-23 12:37:16,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-23 12:37:16,870 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:37:16,870 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 8, 8, 8, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:37:16,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 12:37:17,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 12:37:17,071 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:37:17,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:37:17,071 INFO L85 PathProgramCache]: Analyzing trace with hash 2111458710, now seen corresponding path program 4 times [2021-11-23 12:37:17,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:37:17,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710372984] [2021-11-23 12:37:17,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:37:17,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:37:17,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:37:19,486 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 283 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:37:19,486 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:37:19,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710372984] [2021-11-23 12:37:19,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710372984] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:37:19,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60315171] [2021-11-23 12:37:19,487 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 12:37:19,487 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:37:19,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:37:19,489 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:37:19,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 12:37:19,597 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 12:37:19,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:37:19,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 12:37:19,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:37:19,943 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-23 12:37:19,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-23 12:37:20,696 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 12:37:20,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 28 [2021-11-23 12:37:20,746 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 183 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-23 12:37:20,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:37:21,024 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-23 12:37:21,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2021-11-23 12:37:21,130 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 183 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-23 12:37:21,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60315171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:37:21,131 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:37:21,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 20, 19] total 53 [2021-11-23 12:37:21,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028079004] [2021-11-23 12:37:21,131 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:37:21,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-23 12:37:21,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:37:21,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-23 12:37:21,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=2533, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 12:37:21,133 INFO L87 Difference]: Start difference. First operand 122 states and 147 transitions. Second operand has 53 states, 53 states have (on average 3.188679245283019) internal successors, (169), 53 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:38:18,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:38:18,073 INFO L93 Difference]: Finished difference Result 2262 states and 3123 transitions. [2021-11-23 12:38:18,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 609 states. [2021-11-23 12:38:18,073 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.188679245283019) internal successors, (169), 53 states have internal predecessors, (169), 0 states have call successors, (0), 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 89 [2021-11-23 12:38:18,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:38:18,083 INFO L225 Difference]: With dead ends: 2262 [2021-11-23 12:38:18,084 INFO L226 Difference]: Without dead ends: 2260 [2021-11-23 12:38:18,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 162 SyntacticMatches, 7 SemanticMatches, 648 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186310 ImplicationChecksByTransitivity, 48.3s TimeCoverageRelationStatistics Valid=16540, Invalid=405310, Unknown=0, NotChecked=0, Total=421850 [2021-11-23 12:38:18,107 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 11235 mSDsluCounter, 647 mSDsCounter, 0 mSdLazyCounter, 4015 mSolverCounterSat, 9219 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11235 SdHoareTripleChecker+Valid, 679 SdHoareTripleChecker+Invalid, 13234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 9219 IncrementalHoareTripleChecker+Valid, 4015 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2021-11-23 12:38:18,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11235 Valid, 679 Invalid, 13234 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [9219 Valid, 4015 Invalid, 0 Unknown, 0 Unchecked, 8.4s Time] [2021-11-23 12:38:18,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2260 states. [2021-11-23 12:38:18,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2260 to 140. [2021-11-23 12:38:18,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 139 states have (on average 1.2158273381294964) internal successors, (169), 139 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:38:18,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 169 transitions. [2021-11-23 12:38:18,200 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 169 transitions. Word has length 89 [2021-11-23 12:38:18,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:38:18,200 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 169 transitions. [2021-11-23 12:38:18,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.188679245283019) internal successors, (169), 53 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:38:18,201 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 169 transitions. [2021-11-23 12:38:18,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 12:38:18,202 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:38:18,202 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:38:18,250 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-23 12:38:18,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 12:38:18,431 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:38:18,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:38:18,431 INFO L85 PathProgramCache]: Analyzing trace with hash 430089614, now seen corresponding path program 1 times [2021-11-23 12:38:18,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:38:18,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792462481] [2021-11-23 12:38:18,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:38:18,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:38:18,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:38:20,212 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 0 proven. 317 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:38:20,213 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:38:20,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792462481] [2021-11-23 12:38:20,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792462481] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:38:20,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007008034] [2021-11-23 12:38:20,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:38:20,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:38:20,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:38:20,215 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:38:20,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 12:38:20,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:38:20,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-23 12:38:20,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:38:21,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 12:38:21,642 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 0 proven. 316 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 12:38:21,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:38:21,982 INFO L354 Elim1Store]: treesize reduction 10, result has 33.3 percent of original size [2021-11-23 12:38:21,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 16 [2021-11-23 12:38:22,093 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 0 proven. 217 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-23 12:38:22,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007008034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:38:22,094 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:38:22,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 24, 20] total 57 [2021-11-23 12:38:22,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171375980] [2021-11-23 12:38:22,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:38:22,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-23 12:38:22,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:38:22,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-23 12:38:22,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=2982, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 12:38:22,096 INFO L87 Difference]: Start difference. First operand 140 states and 169 transitions. Second operand has 57 states, 57 states have (on average 3.2982456140350878) internal successors, (188), 57 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:09,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:40:09,054 INFO L93 Difference]: Finished difference Result 6326 states and 8873 transitions. [2021-11-23 12:40:09,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 918 states. [2021-11-23 12:40:09,055 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.2982456140350878) internal successors, (188), 57 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2021-11-23 12:40:09,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:40:09,085 INFO L225 Difference]: With dead ends: 6326 [2021-11-23 12:40:09,085 INFO L226 Difference]: Without dead ends: 6324 [2021-11-23 12:40:09,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1123 GetRequests, 163 SyntacticMatches, 2 SemanticMatches, 958 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428056 ImplicationChecksByTransitivity, 89.1s TimeCoverageRelationStatistics Valid=44640, Invalid=876000, Unknown=0, NotChecked=0, Total=920640 [2021-11-23 12:40:09,135 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 18493 mSDsluCounter, 883 mSDsCounter, 0 mSdLazyCounter, 4181 mSolverCounterSat, 15708 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18493 SdHoareTripleChecker+Valid, 930 SdHoareTripleChecker+Invalid, 19889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 15708 IncrementalHoareTripleChecker+Valid, 4181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.7s IncrementalHoareTripleChecker+Time [2021-11-23 12:40:09,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18493 Valid, 930 Invalid, 19889 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [15708 Valid, 4181 Invalid, 0 Unknown, 0 Unchecked, 13.7s Time] [2021-11-23 12:40:09,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6324 states. [2021-11-23 12:40:09,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6324 to 130. [2021-11-23 12:40:09,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.2015503875968991) internal successors, (155), 129 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:09,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 155 transitions. [2021-11-23 12:40:09,259 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 155 transitions. Word has length 93 [2021-11-23 12:40:09,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:40:09,260 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 155 transitions. [2021-11-23 12:40:09,260 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 3.2982456140350878) internal successors, (188), 57 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:09,261 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 155 transitions. [2021-11-23 12:40:09,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 12:40:09,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:40:09,262 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:40:09,298 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2021-11-23 12:40:09,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:40:09,475 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:40:09,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:40:09,475 INFO L85 PathProgramCache]: Analyzing trace with hash -1281943678, now seen corresponding path program 5 times [2021-11-23 12:40:09,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:40:09,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766934163] [2021-11-23 12:40:09,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:40:09,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:40:09,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:40:09,831 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 163 proven. 137 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 12:40:09,831 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:40:09,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766934163] [2021-11-23 12:40:09,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766934163] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:40:09,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11735909] [2021-11-23 12:40:09,832 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 12:40:09,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:40:09,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:40:09,835 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:40:09,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 12:40:10,816 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-11-23 12:40:10,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:40:10,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 12:40:10,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:40:11,389 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 200 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 12:40:11,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:40:11,619 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 200 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 12:40:11,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11735909] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:40:11,619 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:40:11,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2021-11-23 12:40:11,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866544416] [2021-11-23 12:40:11,619 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:40:11,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 12:40:11,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:40:11,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 12:40:11,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=1065, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 12:40:11,621 INFO L87 Difference]: Start difference. First operand 130 states and 155 transitions. Second operand has 38 states, 38 states have (on average 3.3684210526315788) internal successors, (128), 38 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:12,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:40:12,373 INFO L93 Difference]: Finished difference Result 330 states and 398 transitions. [2021-11-23 12:40:12,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 12:40:12,374 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.3684210526315788) internal successors, (128), 38 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2021-11-23 12:40:12,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:40:12,375 INFO L225 Difference]: With dead ends: 330 [2021-11-23 12:40:12,375 INFO L226 Difference]: Without dead ends: 176 [2021-11-23 12:40:12,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 181 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 742 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=658, Invalid=2204, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 12:40:12,377 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 506 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 506 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 12:40:12,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [506 Valid, 168 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 12:40:12,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-11-23 12:40:12,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 132. [2021-11-23 12:40:12,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.1984732824427482) internal successors, (157), 131 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:12,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 157 transitions. [2021-11-23 12:40:12,461 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 157 transitions. Word has length 97 [2021-11-23 12:40:12,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:40:12,461 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 157 transitions. [2021-11-23 12:40:12,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.3684210526315788) internal successors, (128), 38 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:12,461 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 157 transitions. [2021-11-23 12:40:12,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 12:40:12,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:40:12,463 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:40:12,469 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-23 12:40:12,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:40:12,669 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:40:12,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:40:12,670 INFO L85 PathProgramCache]: Analyzing trace with hash 1513701668, now seen corresponding path program 6 times [2021-11-23 12:40:12,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:40:12,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624835511] [2021-11-23 12:40:12,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:40:12,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:40:12,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:40:13,981 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 81 proven. 95 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 12:40:13,981 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:40:13,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624835511] [2021-11-23 12:40:13,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624835511] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:40:13,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567660134] [2021-11-23 12:40:13,982 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 12:40:13,982 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:40:13,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:40:13,987 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:40:14,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 12:40:15,806 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-11-23 12:40:15,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:40:15,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 12:40:15,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:40:16,734 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 100 proven. 76 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 12:40:16,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:40:18,366 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 121 proven. 55 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 12:40:18,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567660134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:40:18,367 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:40:18,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 58 [2021-11-23 12:40:18,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759601027] [2021-11-23 12:40:18,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:40:18,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-23 12:40:18,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:40:18,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-23 12:40:18,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=751, Invalid=2555, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 12:40:18,369 INFO L87 Difference]: Start difference. First operand 132 states and 157 transitions. Second operand has 58 states, 58 states have (on average 2.8793103448275863) internal successors, (167), 58 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:19,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:40:19,671 INFO L93 Difference]: Finished difference Result 207 states and 245 transitions. [2021-11-23 12:40:19,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 12:40:19,671 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.8793103448275863) internal successors, (167), 58 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2021-11-23 12:40:19,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:40:19,672 INFO L225 Difference]: With dead ends: 207 [2021-11-23 12:40:19,672 INFO L226 Difference]: Without dead ends: 162 [2021-11-23 12:40:19,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 162 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1839 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1343, Invalid=4059, Unknown=0, NotChecked=0, Total=5402 [2021-11-23 12:40:19,674 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 565 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 1191 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 1314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 1191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 12:40:19,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [565 Valid, 235 Invalid, 1314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 1191 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 12:40:19,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-23 12:40:19,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 132. [2021-11-23 12:40:19,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.1984732824427482) internal successors, (157), 131 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:19,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 157 transitions. [2021-11-23 12:40:19,769 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 157 transitions. Word has length 99 [2021-11-23 12:40:19,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:40:19,770 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 157 transitions. [2021-11-23 12:40:19,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.8793103448275863) internal successors, (167), 58 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:19,770 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 157 transitions. [2021-11-23 12:40:19,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 12:40:19,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:40:19,771 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:40:19,821 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-23 12:40:19,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-23 12:40:19,987 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:40:19,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:40:19,987 INFO L85 PathProgramCache]: Analyzing trace with hash 1256942630, now seen corresponding path program 13 times [2021-11-23 12:40:19,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:40:19,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640833487] [2021-11-23 12:40:19,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:40:19,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:40:20,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:40:20,668 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 60 proven. 142 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 12:40:20,668 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:40:20,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640833487] [2021-11-23 12:40:20,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1640833487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:40:20,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156302031] [2021-11-23 12:40:20,668 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 12:40:20,668 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:40:20,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:40:20,670 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:40:20,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 12:40:20,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:40:20,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 12:40:20,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:40:21,535 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 81 proven. 121 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 12:40:21,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:40:22,792 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 81 proven. 121 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-23 12:40:22,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [156302031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:40:22,792 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:40:22,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 21] total 61 [2021-11-23 12:40:22,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876558924] [2021-11-23 12:40:22,793 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:40:22,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-23 12:40:22,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:40:22,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-23 12:40:22,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=763, Invalid=2897, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 12:40:22,794 INFO L87 Difference]: Start difference. First operand 132 states and 157 transitions. Second operand has 61 states, 61 states have (on average 2.8360655737704916) internal successors, (173), 61 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:23,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 12:40:23,641 INFO L93 Difference]: Finished difference Result 254 states and 304 transitions. [2021-11-23 12:40:23,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 12:40:23,642 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.8360655737704916) internal successors, (173), 61 states have internal predecessors, (173), 0 states have call successors, (0), 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 104 [2021-11-23 12:40:23,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 12:40:23,643 INFO L225 Difference]: With dead ends: 254 [2021-11-23 12:40:23,643 INFO L226 Difference]: Without dead ends: 146 [2021-11-23 12:40:23,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1966 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1068, Invalid=3624, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 12:40:23,644 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 412 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 412 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 767 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 12:40:23,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [412 Valid, 114 Invalid, 767 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 663 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 12:40:23,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-23 12:40:23,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 134. [2021-11-23 12:40:23,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.1954887218045114) internal successors, (159), 133 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:23,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 159 transitions. [2021-11-23 12:40:23,704 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 159 transitions. Word has length 104 [2021-11-23 12:40:23,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 12:40:23,705 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 159 transitions. [2021-11-23 12:40:23,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.8360655737704916) internal successors, (173), 61 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 12:40:23,705 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 159 transitions. [2021-11-23 12:40:23,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 12:40:23,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 12:40:23,706 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 10, 10, 10, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 12:40:23,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 12:40:23,906 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-23 12:40:23,906 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 12:40:23,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 12:40:23,907 INFO L85 PathProgramCache]: Analyzing trace with hash 381126724, now seen corresponding path program 14 times [2021-11-23 12:40:23,907 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-23 12:40:23,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134898422] [2021-11-23 12:40:23,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 12:40:23,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 12:40:23,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 12:40:26,214 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 12:40:26,215 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-23 12:40:26,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134898422] [2021-11-23 12:40:26,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134898422] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 12:40:26,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859252197] [2021-11-23 12:40:26,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 12:40:26,216 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 12:40:26,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 [2021-11-23 12:40:26,221 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 12:40:26,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8e5e537-8db4-4088-af5f-9621a3bb57b8/bin/uautomizer-wIGwrQj20G/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-23 12:40:26,301 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 12:40:26,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 12:40:26,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 12:40:26,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 12:40:26,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 12:40:27,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 12:40:27,589 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 281 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-23 12:40:27,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 12:40:28,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 19 [2021-11-23 12:40:28,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-23 12:40:28,632 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 281 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-23 12:40:28,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859252197] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 12:40:28,632 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 12:40:28,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 21, 21] total 68 [2021-11-23 12:40:28,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973458190] [2021-11-23 12:40:28,633 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 12:40:28,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 12:40:28,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-23 12:40:28,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 12:40:28,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=4331, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 12:40:28,635 INFO L87 Difference]: Start difference. First operand 134 states and 159 transitions. Second operand has 68 states, 68 states have (on average 3.4411764705882355) internal successors, (234), 68 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)