./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness-1.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness-1.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 64bit --witnessprinter.graph.data.programhash e96d8d92db1667c6f6142560a7fad2417327f7e06eb532366f9ad7d4ddd7d1f5 --- Real Ultimate output --- This is Ultimate 0.2.2-839c364b5d67a0f615c82cb70ab247790648d4a9-839c364 [2021-12-14 17:06:43,717 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-14 17:06:43,723 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-14 17:06:43,773 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-14 17:06:43,776 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-14 17:06:43,781 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-14 17:06:43,784 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-14 17:06:43,790 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-14 17:06:43,792 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-14 17:06:43,804 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-14 17:06:43,804 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-14 17:06:43,805 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-14 17:06:43,806 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-14 17:06:43,807 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-14 17:06:43,809 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-14 17:06:43,810 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-14 17:06:43,812 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-14 17:06:43,813 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-14 17:06:43,814 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-14 17:06:43,818 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-14 17:06:43,820 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-14 17:06:43,822 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-14 17:06:43,823 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-14 17:06:43,824 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-14 17:06:43,827 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-14 17:06:43,828 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-14 17:06:43,828 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-14 17:06:43,829 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-14 17:06:43,830 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-14 17:06:43,830 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-14 17:06:43,831 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-14 17:06:43,831 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-14 17:06:43,833 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-14 17:06:43,833 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-14 17:06:43,834 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-14 17:06:43,834 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-14 17:06:43,835 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-14 17:06:43,835 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-14 17:06:43,835 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-14 17:06:43,836 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-14 17:06:43,836 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-14 17:06:43,837 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-12-14 17:06:43,859 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-14 17:06:43,860 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-14 17:06:43,860 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-14 17:06:43,861 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-14 17:06:43,861 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-14 17:06:43,862 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-14 17:06:43,862 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-14 17:06:43,863 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-14 17:06:43,863 INFO L138 SettingsManager]: * Use SBE=true [2021-12-14 17:06:43,863 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-14 17:06:43,864 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-14 17:06:43,864 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-14 17:06:43,864 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-14 17:06:43,864 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-14 17:06:43,865 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-14 17:06:43,865 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-14 17:06:43,865 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-14 17:06:43,865 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-14 17:06:43,865 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-14 17:06:43,866 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-14 17:06:43,866 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-14 17:06:43,866 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 17:06:43,866 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-14 17:06:43,866 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-14 17:06:43,867 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-14 17:06:43,867 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-14 17:06:43,867 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-14 17:06:43,868 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-14 17:06:43,868 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-14 17:06:43,869 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-14 17:06:43,869 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-14 17:06:43,869 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:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e96d8d92db1667c6f6142560a7fad2417327f7e06eb532366f9ad7d4ddd7d1f5 [2021-12-14 17:06:44,103 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-14 17:06:44,134 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-14 17:06:44,136 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-14 17:06:44,137 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-14 17:06:44,138 INFO L275 PluginConnector]: CDTParser initialized [2021-12-14 17:06:44,139 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness-1.i [2021-12-14 17:06:44,189 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff379d92a/cdf6987707514b278c7fa464e8678d27/FLAGea2bbec22 [2021-12-14 17:06:44,759 INFO L306 CDTParser]: Found 1 translation units. [2021-12-14 17:06:44,762 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness-1.i [2021-12-14 17:06:44,798 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff379d92a/cdf6987707514b278c7fa464e8678d27/FLAGea2bbec22 [2021-12-14 17:06:44,997 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff379d92a/cdf6987707514b278c7fa464e8678d27 [2021-12-14 17:06:45,000 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-14 17:06:45,002 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-14 17:06:45,003 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-14 17:06:45,003 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-14 17:06:45,005 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-14 17:06:45,006 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 05:06:44" (1/1) ... [2021-12-14 17:06:45,008 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c2d5a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:45, skipping insertion in model container [2021-12-14 17:06:45,009 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 05:06:44" (1/1) ... [2021-12-14 17:06:45,014 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-14 17:06:45,086 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-14 17:06:45,286 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness-1.i[4500,4513] [2021-12-14 17:06:45,293 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness-1.i[4560,4573] [2021-12-14 17:06:45,852 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,852 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,853 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,854 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,855 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,866 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,868 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,870 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,872 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,874 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,875 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,876 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:45,877 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,115 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-12-14 17:06:46,117 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-12-14 17:06:46,118 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-12-14 17:06:46,119 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-12-14 17:06:46,121 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-12-14 17:06:46,122 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-12-14 17:06:46,123 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-12-14 17:06:46,123 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-12-14 17:06:46,124 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-12-14 17:06:46,124 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-12-14 17:06:46,237 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-12-14 17:06:46,250 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 17:06:46,269 INFO L203 MainTranslator]: Completed pre-run [2021-12-14 17:06:46,283 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness-1.i[4500,4513] [2021-12-14 17:06:46,287 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness-1.i[4560,4573] [2021-12-14 17:06:46,324 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,325 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,325 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,325 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,326 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,330 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,330 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,331 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,332 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,332 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,333 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,333 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,333 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-14 17:06:46,353 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-12-14 17:06:46,354 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-12-14 17:06:46,354 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-12-14 17:06:46,355 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-12-14 17:06:46,355 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-12-14 17:06:46,356 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-12-14 17:06:46,356 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-12-14 17:06:46,356 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-12-14 17:06:46,356 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-12-14 17:06:46,361 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-12-14 17:06:46,374 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-12-14 17:06:46,393 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 17:06:46,528 INFO L208 MainTranslator]: Completed translation [2021-12-14 17:06:46,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46 WrapperNode [2021-12-14 17:06:46,528 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-14 17:06:46,530 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-14 17:06:46,530 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-14 17:06:46,530 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-14 17:06:46,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (1/1) ... [2021-12-14 17:06:46,605 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (1/1) ... [2021-12-14 17:06:46,630 INFO L137 Inliner]: procedures = 679, calls = 1032, calls flagged for inlining = 48, calls inlined = 3, statements flattened = 29 [2021-12-14 17:06:46,631 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-14 17:06:46,631 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-14 17:06:46,632 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-14 17:06:46,632 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-14 17:06:46,638 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (1/1) ... [2021-12-14 17:06:46,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (1/1) ... [2021-12-14 17:06:46,642 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (1/1) ... [2021-12-14 17:06:46,642 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (1/1) ... [2021-12-14 17:06:46,648 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (1/1) ... [2021-12-14 17:06:46,658 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (1/1) ... [2021-12-14 17:06:46,665 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (1/1) ... [2021-12-14 17:06:46,667 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-14 17:06:46,668 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-14 17:06:46,668 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-14 17:06:46,668 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-14 17:06:46,672 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (1/1) ... [2021-12-14 17:06:46,678 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 17:06:46,685 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 17:06:46,707 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-14 17:06:46,724 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-14 17:06:46,736 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_reset [2021-12-14 17:06:46,737 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_reset [2021-12-14 17:06:46,737 INFO L130 BoogieDeclarations]: Found specification of procedure aws_is_mem_zeroed [2021-12-14 17:06:46,737 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_is_mem_zeroed [2021-12-14 17:06:46,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-14 17:06:46,737 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-14 17:06:46,737 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-14 17:06:46,737 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-14 17:06:46,738 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-14 17:06:46,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-14 17:06:46,738 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-14 17:06:46,738 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2021-12-14 17:06:46,738 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2021-12-14 17:06:46,738 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-12-14 17:06:46,739 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-12-14 17:06:46,739 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-14 17:06:46,739 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-14 17:06:46,739 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-14 17:06:46,877 INFO L236 CfgBuilder]: Building ICFG [2021-12-14 17:06:46,885 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-14 17:06:47,016 INFO L277 CfgBuilder]: Performing block encoding [2021-12-14 17:06:47,021 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-14 17:06:47,022 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-14 17:06:47,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 05:06:47 BoogieIcfgContainer [2021-12-14 17:06:47,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-14 17:06:47,024 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-14 17:06:47,024 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-14 17:06:47,027 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-14 17:06:47,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 05:06:44" (1/3) ... [2021-12-14 17:06:47,028 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2508fb35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 05:06:47, skipping insertion in model container [2021-12-14 17:06:47,028 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:06:46" (2/3) ... [2021-12-14 17:06:47,028 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2508fb35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 05:06:47, skipping insertion in model container [2021-12-14 17:06:47,028 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 05:06:47" (3/3) ... [2021-12-14 17:06:47,029 INFO L111 eAbstractionObserver]: Analyzing ICFG aws_linked_list_node_reset_harness-1.i [2021-12-14 17:06:47,033 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-14 17:06:47,033 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-14 17:06:47,066 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-14 17:06:47,070 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 [2021-12-14 17:06:47,070 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-14 17:06:47,083 INFO L276 IsEmpty]: Start isEmpty. Operand has 41 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-14 17:06:47,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-14 17:06:47,087 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:06:47,088 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:06:47,088 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:06:47,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:06:47,092 INFO L85 PathProgramCache]: Analyzing trace with hash -527313499, now seen corresponding path program 1 times [2021-12-14 17:06:47,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:06:47,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364495141] [2021-12-14 17:06:47,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:06:47,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:06:47,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:47,332 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:06:47,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:47,366 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-14 17:06:47,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:47,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:47,435 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:06:47,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364495141] [2021-12-14 17:06:47,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364495141] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 17:06:47,436 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 17:06:47,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-14 17:06:47,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707022315] [2021-12-14 17:06:47,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 17:06:47,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-14 17:06:47,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:06:47,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-14 17:06:47,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 17:06:47,467 INFO L87 Difference]: Start difference. First operand has 41 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-14 17:06:47,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:06:47,488 INFO L93 Difference]: Finished difference Result 75 states and 96 transitions. [2021-12-14 17:06:47,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-14 17:06:47,491 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-12-14 17:06:47,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:06:47,497 INFO L225 Difference]: With dead ends: 75 [2021-12-14 17:06:47,498 INFO L226 Difference]: Without dead ends: 36 [2021-12-14 17:06:47,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 17:06:47,505 INFO L933 BasicCegarLoop]: 45 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, 45 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 [2021-12-14 17:06:47,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 17:06:47,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-14 17:06:47,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-12-14 17:06:47,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-14 17:06:47,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-12-14 17:06:47,550 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 20 [2021-12-14 17:06:47,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:06:47,551 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-12-14 17:06:47,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-14 17:06:47,551 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-12-14 17:06:47,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-14 17:06:47,554 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:06:47,554 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:06:47,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-14 17:06:47,556 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:06:47,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:06:47,557 INFO L85 PathProgramCache]: Analyzing trace with hash 74286250, now seen corresponding path program 1 times [2021-12-14 17:06:47,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:06:47,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508951879] [2021-12-14 17:06:47,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:06:47,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:06:47,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:47,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:06:47,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:47,701 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 17:06:47,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:47,778 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 17:06:47,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:47,793 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:47,793 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:06:47,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508951879] [2021-12-14 17:06:47,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508951879] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 17:06:47,794 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 17:06:47,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-14 17:06:47,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495063248] [2021-12-14 17:06:47,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 17:06:47,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-14 17:06:47,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:06:47,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-14 17:06:47,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-14 17:06:47,797 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-14 17:06:47,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:06:47,929 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2021-12-14 17:06:47,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-14 17:06:47,930 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-12-14 17:06:47,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:06:47,932 INFO L225 Difference]: With dead ends: 61 [2021-12-14 17:06:47,932 INFO L226 Difference]: Without dead ends: 37 [2021-12-14 17:06:47,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-12-14 17:06:47,934 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 22 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 17:06:47,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 84 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 17:06:47,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-14 17:06:47,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-12-14 17:06:47,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 25 states have internal predecessors, (28), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-14 17:06:47,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-12-14 17:06:47,949 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 26 [2021-12-14 17:06:47,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:06:47,949 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-12-14 17:06:47,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-14 17:06:47,950 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-12-14 17:06:47,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-14 17:06:47,951 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:06:47,951 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:06:47,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-14 17:06:47,951 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:06:47,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:06:47,954 INFO L85 PathProgramCache]: Analyzing trace with hash -2047649194, now seen corresponding path program 1 times [2021-12-14 17:06:47,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:06:47,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704116771] [2021-12-14 17:06:47,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:06:47,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:06:47,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:48,035 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:06:48,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:48,050 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 17:06:48,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:48,149 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-12-14 17:06:48,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:48,164 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:48,166 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:06:48,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704116771] [2021-12-14 17:06:48,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704116771] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 17:06:48,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402747885] [2021-12-14 17:06:48,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:06:48,167 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:06:48,167 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 17:06:48,172 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 17:06:48,191 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-14 17:06:48,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:48,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-14 17:06:48,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 17:06:48,401 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 16 treesize of output 12 [2021-12-14 17:06:48,974 WARN L322 ript$VariableManager]: TermVariabe |aux_div_v_#Ultimate.C_memset_#t~loopctr676_5_65| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 17:06:48,974 WARN L322 ript$VariableManager]: TermVariabe |aux_mod_v_#Ultimate.C_memset_#t~loopctr676_5_65| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 17:06:49,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:49,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 17:06:49,353 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 14 treesize of output 12 [2021-12-14 17:06:49,358 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 26 treesize of output 24 [2021-12-14 17:06:49,398 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:49,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402747885] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 17:06:49,398 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 17:06:49,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 8] total 18 [2021-12-14 17:06:49,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927712010] [2021-12-14 17:06:49,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 17:06:49,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-14 17:06:49,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:06:49,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-14 17:06:49,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-12-14 17:06:49,400 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 16 states have internal predecessors, (39), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:06:49,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:06:49,795 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2021-12-14 17:06:49,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-14 17:06:49,796 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 16 states have internal predecessors, (39), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 27 [2021-12-14 17:06:49,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:06:49,798 INFO L225 Difference]: With dead ends: 70 [2021-12-14 17:06:49,798 INFO L226 Difference]: Without dead ends: 46 [2021-12-14 17:06:49,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-12-14 17:06:49,799 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 29 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 98 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 17:06:49,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 187 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 205 Invalid, 0 Unknown, 98 Unchecked, 0.2s Time] [2021-12-14 17:06:49,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-12-14 17:06:49,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2021-12-14 17:06:49,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 25 states have (on average 1.16) internal successors, (29), 26 states have internal predecessors, (29), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-14 17:06:49,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-12-14 17:06:49,805 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 27 [2021-12-14 17:06:49,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:06:49,806 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-12-14 17:06:49,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 16 states have internal predecessors, (39), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:06:49,806 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-12-14 17:06:49,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-14 17:06:49,806 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:06:49,806 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:06:49,828 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-14 17:06:50,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:06:50,025 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:06:50,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:06:50,026 INFO L85 PathProgramCache]: Analyzing trace with hash 891828778, now seen corresponding path program 2 times [2021-12-14 17:06:50,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:06:50,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [543272691] [2021-12-14 17:06:50,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:06:50,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:06:50,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:50,080 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:06:50,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:50,094 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 17:06:50,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:50,184 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-14 17:06:50,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:50,193 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:50,193 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:06:50,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [543272691] [2021-12-14 17:06:50,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [543272691] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 17:06:50,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193896048] [2021-12-14 17:06:50,194 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 17:06:50,194 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:06:50,194 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 17:06:50,195 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 17:06:50,231 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-14 17:06:50,301 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 17:06:50,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 17:06:50,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-14 17:06:50,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 17:06:50,335 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 14 treesize of output 10 [2021-12-14 17:06:50,377 INFO L354 Elim1Store]: treesize reduction 47, result has 21.7 percent of original size [2021-12-14 17:06:50,377 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 31 treesize of output 30 [2021-12-14 17:06:50,947 WARN L322 ript$VariableManager]: TermVariabe |aux_mod_v_#Ultimate.C_memset_#t~loopctr676_13_91| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 17:06:50,947 WARN L322 ript$VariableManager]: TermVariabe |aux_div_v_#Ultimate.C_memset_#t~loopctr676_13_91| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 17:06:50,974 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:50,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 17:06:51,236 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 17 treesize of output 15 [2021-12-14 17:06:51,315 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 20 treesize of output 18 [2021-12-14 17:06:51,319 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 148 treesize of output 144 [2021-12-14 17:06:51,383 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:51,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193896048] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 17:06:51,383 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 17:06:51,383 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 9] total 21 [2021-12-14 17:06:51,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981644332] [2021-12-14 17:06:51,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 17:06:51,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-14 17:06:51,384 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:06:51,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-14 17:06:51,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=357, Unknown=0, NotChecked=0, Total=420 [2021-12-14 17:06:51,385 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 19 states have internal predecessors, (42), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:06:51,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:06:51,760 INFO L93 Difference]: Finished difference Result 71 states and 83 transitions. [2021-12-14 17:06:51,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-14 17:06:51,761 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 19 states have internal predecessors, (42), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 28 [2021-12-14 17:06:51,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:06:51,762 INFO L225 Difference]: With dead ends: 71 [2021-12-14 17:06:51,762 INFO L226 Difference]: Without dead ends: 47 [2021-12-14 17:06:51,762 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2021-12-14 17:06:51,763 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 29 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 164 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 17:06:51,763 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 224 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 214 Invalid, 0 Unknown, 164 Unchecked, 0.2s Time] [2021-12-14 17:06:51,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-12-14 17:06:51,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2021-12-14 17:06:51,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 27 states have internal predecessors, (30), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-14 17:06:51,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-12-14 17:06:51,770 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 28 [2021-12-14 17:06:51,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:06:51,770 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-12-14 17:06:51,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 19 states have internal predecessors, (42), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:06:51,771 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-12-14 17:06:51,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-14 17:06:51,771 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:06:51,772 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:06:51,792 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-14 17:06:51,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-12-14 17:06:51,976 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:06:51,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:06:51,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1821332694, now seen corresponding path program 3 times [2021-12-14 17:06:51,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:06:51,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280134423] [2021-12-14 17:06:51,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:06:51,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:06:51,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:52,012 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:06:52,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:52,022 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 17:06:52,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:52,127 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-14 17:06:52,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:52,135 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:52,135 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:06:52,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280134423] [2021-12-14 17:06:52,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280134423] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 17:06:52,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96713946] [2021-12-14 17:06:52,136 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 17:06:52,136 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:06:52,136 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 17:06:52,137 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 17:06:52,138 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-14 17:06:52,287 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-14 17:06:52,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 17:06:52,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-14 17:06:52,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 17:06:52,325 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 14 treesize of output 10 [2021-12-14 17:06:52,377 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-14 17:06:52,377 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 25 treesize of output 24 [2021-12-14 17:06:52,433 INFO L354 Elim1Store]: treesize reduction 112, result has 19.4 percent of original size [2021-12-14 17:06:52,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 46 [2021-12-14 17:06:55,189 WARN L322 ript$VariableManager]: TermVariabe |aux_mod_v_#Ultimate.C_memset_#t~loopctr676_24_91| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 17:06:55,189 WARN L322 ript$VariableManager]: TermVariabe |aux_div_v_#Ultimate.C_memset_#t~loopctr676_24_91| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 17:06:55,230 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:55,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 17:06:55,634 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 26 treesize of output 24 [2021-12-14 17:06:55,637 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 146 treesize of output 144 [2021-12-14 17:06:55,701 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:55,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96713946] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 17:06:55,701 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 17:06:55,702 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 10] total 24 [2021-12-14 17:06:55,702 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146478587] [2021-12-14 17:06:55,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 17:06:55,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-14 17:06:55,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:06:55,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-14 17:06:55,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=470, Unknown=1, NotChecked=0, Total=552 [2021-12-14 17:06:55,703 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 24 states, 24 states have (on average 1.875) internal successors, (45), 22 states have internal predecessors, (45), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:06:56,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:06:56,144 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2021-12-14 17:06:56,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-14 17:06:56,145 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 22 states have internal predecessors, (45), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 29 [2021-12-14 17:06:56,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:06:56,146 INFO L225 Difference]: With dead ends: 72 [2021-12-14 17:06:56,146 INFO L226 Difference]: Without dead ends: 48 [2021-12-14 17:06:56,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=121, Invalid=748, Unknown=1, NotChecked=0, Total=870 [2021-12-14 17:06:56,149 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 29 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 17:06:56,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 190 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 286 Invalid, 0 Unknown, 79 Unchecked, 0.2s Time] [2021-12-14 17:06:56,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-14 17:06:56,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2021-12-14 17:06:56,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.2) internal successors, (36), 32 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 6 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-12-14 17:06:56,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2021-12-14 17:06:56,157 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 29 [2021-12-14 17:06:56,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:06:56,157 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2021-12-14 17:06:56,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 22 states have internal predecessors, (45), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:06:56,158 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2021-12-14 17:06:56,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-14 17:06:56,158 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:06:56,158 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:06:56,178 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-14 17:06:56,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:06:56,359 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:06:56,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:06:56,359 INFO L85 PathProgramCache]: Analyzing trace with hash -996879181, now seen corresponding path program 1 times [2021-12-14 17:06:56,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:06:56,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245142531] [2021-12-14 17:06:56,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:06:56,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:06:56,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:56,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:06:56,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:56,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 17:06:56,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:56,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-14 17:06:56,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:56,477 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-14 17:06:56,477 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:06:56,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245142531] [2021-12-14 17:06:56,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1245142531] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 17:06:56,478 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 17:06:56,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-14 17:06:56,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909649442] [2021-12-14 17:06:56,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 17:06:56,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-14 17:06:56,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:06:56,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-14 17:06:56,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-14 17:06:56,479 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-14 17:06:56,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:06:56,563 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2021-12-14 17:06:56,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-14 17:06:56,564 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 30 [2021-12-14 17:06:56,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:06:56,567 INFO L225 Difference]: With dead ends: 54 [2021-12-14 17:06:56,567 INFO L226 Difference]: Without dead ends: 52 [2021-12-14 17:06:56,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-12-14 17:06:56,569 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 26 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 17:06:56,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 134 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 17:06:56,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-12-14 17:06:56,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-12-14 17:06:56,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 37 states have internal predecessors, (40), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-12-14 17:06:56,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 58 transitions. [2021-12-14 17:06:56,587 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 58 transitions. Word has length 30 [2021-12-14 17:06:56,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:06:56,589 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 58 transitions. [2021-12-14 17:06:56,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-14 17:06:56,589 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 58 transitions. [2021-12-14 17:06:56,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-14 17:06:56,591 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:06:56,591 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:06:56,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-14 17:06:56,591 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:06:56,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:06:56,592 INFO L85 PathProgramCache]: Analyzing trace with hash 508754072, now seen corresponding path program 1 times [2021-12-14 17:06:56,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:06:56,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622495875] [2021-12-14 17:06:56,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:06:56,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:06:56,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:56,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:06:56,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:56,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 17:06:56,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:56,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-14 17:06:56,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:56,766 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-14 17:06:56,766 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:06:56,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622495875] [2021-12-14 17:06:56,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622495875] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 17:06:56,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296906289] [2021-12-14 17:06:56,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:06:56,767 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:06:56,767 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 17:06:56,768 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 17:06:56,769 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-14 17:06:56,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:06:56,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 46 conjunts are in the unsatisfiable core [2021-12-14 17:06:56,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 17:06:56,916 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 14 treesize of output 10 [2021-12-14 17:06:56,945 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-14 17:06:56,945 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 25 treesize of output 24 [2021-12-14 17:06:56,988 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-12-14 17:06:56,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-12-14 17:06:57,029 INFO L354 Elim1Store]: treesize reduction 72, result has 22.6 percent of original size [2021-12-14 17:06:57,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 36 [2021-12-14 17:06:59,461 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:06:59,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 17:07:00,124 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 34 treesize of output 32 [2021-12-14 17:07:00,127 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 772 treesize of output 764 [2021-12-14 17:07:00,306 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:07:00,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296906289] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 17:07:00,306 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 17:07:00,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 12] total 29 [2021-12-14 17:07:00,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556021871] [2021-12-14 17:07:00,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 17:07:00,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-14 17:07:00,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:07:00,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-14 17:07:00,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=718, Unknown=1, NotChecked=0, Total=812 [2021-12-14 17:07:00,309 INFO L87 Difference]: Start difference. First operand 51 states and 58 transitions. Second operand has 29 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 27 states have internal predecessors, (56), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:07:00,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:07:00,923 INFO L93 Difference]: Finished difference Result 96 states and 114 transitions. [2021-12-14 17:07:00,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-14 17:07:00,923 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 27 states have internal predecessors, (56), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 33 [2021-12-14 17:07:00,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:07:00,924 INFO L225 Difference]: With dead ends: 96 [2021-12-14 17:07:00,924 INFO L226 Difference]: Without dead ends: 61 [2021-12-14 17:07:00,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=164, Invalid=1317, Unknown=1, NotChecked=0, Total=1482 [2021-12-14 17:07:00,926 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 32 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 164 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-14 17:07:00,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 206 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 349 Invalid, 0 Unknown, 164 Unchecked, 0.3s Time] [2021-12-14 17:07:00,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-12-14 17:07:00,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 55. [2021-12-14 17:07:00,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 41 states have internal predecessors, (46), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-12-14 17:07:00,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-12-14 17:07:00,933 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 33 [2021-12-14 17:07:00,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:07:00,934 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-12-14 17:07:00,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 27 states have internal predecessors, (56), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:07:00,934 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-12-14 17:07:00,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-14 17:07:00,935 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:07:00,935 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:07:00,963 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-14 17:07:01,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:07:01,159 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:07:01,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:07:01,160 INFO L85 PathProgramCache]: Analyzing trace with hash -1979289706, now seen corresponding path program 2 times [2021-12-14 17:07:01,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:07:01,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705540738] [2021-12-14 17:07:01,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:07:01,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:07:01,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:01,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:07:01,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:01,227 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 17:07:01,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:01,356 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-14 17:07:01,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:01,368 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-14 17:07:01,368 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:07:01,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705540738] [2021-12-14 17:07:01,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [705540738] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 17:07:01,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217215512] [2021-12-14 17:07:01,369 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 17:07:01,369 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:07:01,369 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 17:07:01,370 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 17:07:01,371 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-14 17:07:01,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 17:07:01,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 17:07:01,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 62 conjunts are in the unsatisfiable core [2021-12-14 17:07:01,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 17:07:01,556 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 14 treesize of output 10 [2021-12-14 17:07:01,580 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-14 17:07:01,580 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 25 treesize of output 24 [2021-12-14 17:07:01,627 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-12-14 17:07:01,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-12-14 17:07:01,675 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-12-14 17:07:01,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 50 [2021-12-14 17:07:01,736 INFO L354 Elim1Store]: treesize reduction 200, result has 17.0 percent of original size [2021-12-14 17:07:01,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 54 treesize of output 62 [2021-12-14 17:07:04,613 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:07:04,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 17:07:05,261 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 34 treesize of output 32 [2021-12-14 17:07:05,507 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 40 treesize of output 38 [2021-12-14 17:07:05,509 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 780 treesize of output 776 [2021-12-14 17:07:05,624 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:07:05,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217215512] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 17:07:05,625 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 17:07:05,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15, 14] total 34 [2021-12-14 17:07:05,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672975472] [2021-12-14 17:07:05,625 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 17:07:05,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-14 17:07:05,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:07:05,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-14 17:07:05,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=988, Unknown=1, NotChecked=0, Total=1122 [2021-12-14 17:07:05,626 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 34 states, 34 states have (on average 1.911764705882353) internal successors, (65), 32 states have internal predecessors, (65), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:07:06,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:07:06,614 INFO L93 Difference]: Finished difference Result 103 states and 125 transitions. [2021-12-14 17:07:06,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-14 17:07:06,615 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.911764705882353) internal successors, (65), 32 states have internal predecessors, (65), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 37 [2021-12-14 17:07:06,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:07:06,615 INFO L225 Difference]: With dead ends: 103 [2021-12-14 17:07:06,616 INFO L226 Difference]: Without dead ends: 65 [2021-12-14 17:07:06,616 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=227, Invalid=1842, Unknown=1, NotChecked=0, Total=2070 [2021-12-14 17:07:06,617 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 36 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 597 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 858 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 237 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-14 17:07:06,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 248 Invalid, 858 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 597 Invalid, 0 Unknown, 237 Unchecked, 0.6s Time] [2021-12-14 17:07:06,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-12-14 17:07:06,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 59. [2021-12-14 17:07:06,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 45 states have internal predecessors, (52), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-12-14 17:07:06,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 70 transitions. [2021-12-14 17:07:06,623 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 70 transitions. Word has length 37 [2021-12-14 17:07:06,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:07:06,623 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 70 transitions. [2021-12-14 17:07:06,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.911764705882353) internal successors, (65), 32 states have internal predecessors, (65), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:07:06,623 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 70 transitions. [2021-12-14 17:07:06,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-14 17:07:06,624 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:07:06,624 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:07:06,646 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-14 17:07:06,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:07:06,833 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:07:06,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:07:06,834 INFO L85 PathProgramCache]: Analyzing trace with hash 1165720024, now seen corresponding path program 3 times [2021-12-14 17:07:06,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:07:06,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389274695] [2021-12-14 17:07:06,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:07:06,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:07:06,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:06,889 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:07:06,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:06,900 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 17:07:06,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:07,062 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-12-14 17:07:07,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:07,076 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-14 17:07:07,076 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:07:07,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389274695] [2021-12-14 17:07:07,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [389274695] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 17:07:07,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337989095] [2021-12-14 17:07:07,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 17:07:07,077 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:07:07,077 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 17:07:07,078 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 17:07:07,079 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-14 17:07:07,330 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-14 17:07:07,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 17:07:07,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 71 conjunts are in the unsatisfiable core [2021-12-14 17:07:07,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 17:07:07,357 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 14 treesize of output 10 [2021-12-14 17:07:07,382 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-14 17:07:07,383 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 25 treesize of output 24 [2021-12-14 17:07:07,435 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-12-14 17:07:07,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-12-14 17:07:07,492 INFO L354 Elim1Store]: treesize reduction 129, result has 19.4 percent of original size [2021-12-14 17:07:07,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 44 treesize of output 49 [2021-12-14 17:07:07,586 INFO L354 Elim1Store]: treesize reduction 202, result has 16.5 percent of original size [2021-12-14 17:07:07,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 54 treesize of output 62 [2021-12-14 17:07:07,695 INFO L354 Elim1Store]: treesize reduction 278, result has 15.2 percent of original size [2021-12-14 17:07:07,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 63 treesize of output 74 [2021-12-14 17:07:15,794 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:07:15,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 17:07:17,034 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 34 treesize of output 32 [2021-12-14 17:07:17,036 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 382 treesize of output 378 [2021-12-14 17:07:17,101 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-14 17:07:17,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337989095] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 17:07:17,101 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 17:07:17,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17, 14] total 37 [2021-12-14 17:07:17,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174389241] [2021-12-14 17:07:17,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 17:07:17,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-12-14 17:07:17,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:07:17,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-12-14 17:07:17,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1192, Unknown=3, NotChecked=0, Total=1332 [2021-12-14 17:07:17,103 INFO L87 Difference]: Start difference. First operand 59 states and 70 transitions. Second operand has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:07:32,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:07:32,048 INFO L93 Difference]: Finished difference Result 131 states and 160 transitions. [2021-12-14 17:07:32,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-12-14 17:07:32,049 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 41 [2021-12-14 17:07:32,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:07:32,050 INFO L225 Difference]: With dead ends: 131 [2021-12-14 17:07:32,050 INFO L226 Difference]: Without dead ends: 82 [2021-12-14 17:07:32,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 359 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=237, Invalid=2206, Unknown=7, NotChecked=0, Total=2450 [2021-12-14 17:07:32,051 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 46 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 102 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-14 17:07:32,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 407 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 406 Invalid, 0 Unknown, 102 Unchecked, 0.4s Time] [2021-12-14 17:07:32,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-12-14 17:07:32,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 75. [2021-12-14 17:07:32,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 58 states have (on average 1.2758620689655173) internal successors, (74), 60 states have internal predecessors, (74), 8 states have call successors, (8), 7 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-12-14 17:07:32,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 92 transitions. [2021-12-14 17:07:32,058 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 92 transitions. Word has length 41 [2021-12-14 17:07:32,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:07:32,059 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 92 transitions. [2021-12-14 17:07:32,059 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:07:32,059 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 92 transitions. [2021-12-14 17:07:32,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-14 17:07:32,060 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:07:32,060 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:07:32,079 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-14 17:07:32,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:07:32,275 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:07:32,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:07:32,276 INFO L85 PathProgramCache]: Analyzing trace with hash -150209962, now seen corresponding path program 4 times [2021-12-14 17:07:32,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:07:32,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622145302] [2021-12-14 17:07:32,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:07:32,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:07:32,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:32,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:07:32,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:32,356 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 17:07:32,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:32,523 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 17:07:32,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:32,533 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-12-14 17:07:32,534 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:07:32,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622145302] [2021-12-14 17:07:32,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622145302] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 17:07:32,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927669700] [2021-12-14 17:07:32,534 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 17:07:32,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:07:32,534 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 17:07:32,535 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 17:07:32,536 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-14 17:07:32,781 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 17:07:32,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 17:07:32,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 76 conjunts are in the unsatisfiable core [2021-12-14 17:07:32,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 17:07:32,808 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 14 treesize of output 10 [2021-12-14 17:07:32,835 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-14 17:07:32,835 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 25 treesize of output 24 [2021-12-14 17:07:32,890 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-12-14 17:07:32,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-12-14 17:07:32,945 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-12-14 17:07:32,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 50 [2021-12-14 17:07:33,009 INFO L354 Elim1Store]: treesize reduction 208, result has 16.5 percent of original size [2021-12-14 17:07:33,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 63 [2021-12-14 17:07:33,092 INFO L354 Elim1Store]: treesize reduction 295, result has 14.7 percent of original size [2021-12-14 17:07:33,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 65 treesize of output 76 [2021-12-14 17:07:33,195 INFO L354 Elim1Store]: treesize reduction 384, result has 13.7 percent of original size [2021-12-14 17:07:33,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 74 treesize of output 88 [2021-12-14 17:07:34,493 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:07:34,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 17:07:36,335 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 52 treesize of output 50 [2021-12-14 17:07:36,337 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 6132 treesize of output 6124 [2021-12-14 17:07:39,118 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 17:07:39,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927669700] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 17:07:39,118 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 17:07:39,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19, 18] total 44 [2021-12-14 17:07:39,118 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694830312] [2021-12-14 17:07:39,118 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 17:07:39,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-14 17:07:39,119 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:07:39,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-14 17:07:39,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1718, Unknown=0, NotChecked=0, Total=1892 [2021-12-14 17:07:39,121 INFO L87 Difference]: Start difference. First operand 75 states and 92 transitions. Second operand has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 42 states have internal predecessors, (83), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:07:42,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:07:42,512 INFO L93 Difference]: Finished difference Result 171 states and 226 transitions. [2021-12-14 17:07:42,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-14 17:07:42,513 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 42 states have internal predecessors, (83), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2021-12-14 17:07:42,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:07:42,514 INFO L225 Difference]: With dead ends: 171 [2021-12-14 17:07:42,514 INFO L226 Difference]: Without dead ends: 115 [2021-12-14 17:07:42,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 712 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=369, Invalid=4053, Unknown=0, NotChecked=0, Total=4422 [2021-12-14 17:07:42,515 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 78 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 1242 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 2051 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 774 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-12-14 17:07:42,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 372 Invalid, 2051 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1242 Invalid, 0 Unknown, 774 Unchecked, 1.3s Time] [2021-12-14 17:07:42,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-12-14 17:07:42,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 91. [2021-12-14 17:07:42,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 71 states have (on average 1.323943661971831) internal successors, (94), 75 states have internal predecessors, (94), 9 states have call successors, (9), 7 states have call predecessors, (9), 10 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) [2021-12-14 17:07:42,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2021-12-14 17:07:42,529 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 45 [2021-12-14 17:07:42,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:07:42,529 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2021-12-14 17:07:42,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 42 states have internal predecessors, (83), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 17:07:42,530 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2021-12-14 17:07:42,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-14 17:07:42,530 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:07:42,530 INFO L514 BasicCegarLoop]: trace histogram [8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:07:42,550 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-14 17:07:42,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:07:42,749 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:07:42,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:07:42,749 INFO L85 PathProgramCache]: Analyzing trace with hash 389849080, now seen corresponding path program 1 times [2021-12-14 17:07:42,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:07:42,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59586818] [2021-12-14 17:07:42,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:07:42,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:07:42,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:42,800 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 17:07:42,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:42,852 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-12-14 17:07:42,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:42,859 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-14 17:07:42,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:43,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-14 17:07:43,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:43,080 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-14 17:07:43,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:43,088 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-12-14 17:07:43,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:43,093 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-14 17:07:43,094 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:07:43,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59586818] [2021-12-14 17:07:43,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59586818] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 17:07:43,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878810772] [2021-12-14 17:07:43,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:07:43,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:07:43,094 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 17:07:43,095 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 17:07:43,096 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-14 17:07:43,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:43,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-14 17:07:43,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 17:07:43,326 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-12-14 17:07:43,326 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-14 17:07:43,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878810772] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 17:07:43,326 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-14 17:07:43,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [13] total 15 [2021-12-14 17:07:43,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897911840] [2021-12-14 17:07:43,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 17:07:43,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-14 17:07:43,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 17:07:43,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-14 17:07:43,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2021-12-14 17:07:43,329 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-14 17:07:43,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 17:07:43,358 INFO L93 Difference]: Finished difference Result 139 states and 179 transitions. [2021-12-14 17:07:43,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-14 17:07:43,358 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 48 [2021-12-14 17:07:43,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 17:07:43,360 INFO L225 Difference]: With dead ends: 139 [2021-12-14 17:07:43,360 INFO L226 Difference]: Without dead ends: 93 [2021-12-14 17:07:43,361 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2021-12-14 17:07:43,361 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 7 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 17:07:43,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 106 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 17:07:43,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-12-14 17:07:43,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2021-12-14 17:07:43,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 71 states have (on average 1.295774647887324) internal successors, (92), 75 states have internal predecessors, (92), 9 states have call successors, (9), 7 states have call predecessors, (9), 10 states have return successors, (15), 8 states have call predecessors, (15), 8 states have call successors, (15) [2021-12-14 17:07:43,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 116 transitions. [2021-12-14 17:07:43,375 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 116 transitions. Word has length 48 [2021-12-14 17:07:43,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 17:07:43,376 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 116 transitions. [2021-12-14 17:07:43,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-14 17:07:43,376 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 116 transitions. [2021-12-14 17:07:43,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-14 17:07:43,377 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 17:07:43,377 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 17:07:43,397 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-14 17:07:43,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-14 17:07:43,591 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 17:07:43,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 17:07:43,592 INFO L85 PathProgramCache]: Analyzing trace with hash -680817896, now seen corresponding path program 5 times [2021-12-14 17:07:43,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 17:07:43,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562710926] [2021-12-14 17:07:43,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 17:07:43,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 17:07:43,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:43,644 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-14 17:07:43,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:43,655 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 17:07:43,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:43,840 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-14 17:07:43,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 17:07:43,851 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-12-14 17:07:43,851 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 17:07:43,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562710926] [2021-12-14 17:07:43,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562710926] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 17:07:43,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611581820] [2021-12-14 17:07:43,852 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 17:07:43,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 17:07:43,852 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 17:07:43,872 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 17:07:43,873 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-14 17:07:45,074 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-14 17:07:45,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 17:07:45,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 89 conjunts are in the unsatisfiable core [2021-12-14 17:07:45,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 17:07:45,101 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 14 treesize of output 10 [2021-12-14 17:07:45,127 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-14 17:07:45,127 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 25 treesize of output 24 [2021-12-14 17:07:45,162 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-12-14 17:07:45,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-12-14 17:07:45,210 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-12-14 17:07:45,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 50 [2021-12-14 17:07:45,281 INFO L354 Elim1Store]: treesize reduction 208, result has 16.5 percent of original size [2021-12-14 17:07:45,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 63 [2021-12-14 17:07:45,364 INFO L354 Elim1Store]: treesize reduction 295, result has 14.7 percent of original size [2021-12-14 17:07:45,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 65 treesize of output 76 [2021-12-14 17:07:45,482 INFO L354 Elim1Store]: treesize reduction 396, result has 13.3 percent of original size [2021-12-14 17:07:45,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 75 treesize of output 89 [2021-12-14 17:07:45,654 INFO L354 Elim1Store]: treesize reduction 742, result has 11.0 percent of original size [2021-12-14 17:07:45,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 109 treesize of output 126