./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 c3fed411 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-tmp.no-commuhash-c3fed41 [2021-12-18 00:54:52,064 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-18 00:54:52,066 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-18 00:54:52,086 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-18 00:54:52,087 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-18 00:54:52,090 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-18 00:54:52,091 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-18 00:54:52,094 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-18 00:54:52,095 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-18 00:54:52,098 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-18 00:54:52,099 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-18 00:54:52,100 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-18 00:54:52,100 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-18 00:54:52,102 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-18 00:54:52,103 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-18 00:54:52,106 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-18 00:54:52,107 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-18 00:54:52,108 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-18 00:54:52,111 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-18 00:54:52,115 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-18 00:54:52,116 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-18 00:54:52,117 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-18 00:54:52,118 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-18 00:54:52,119 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-18 00:54:52,123 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-18 00:54:52,124 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-18 00:54:52,124 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-18 00:54:52,125 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-18 00:54:52,125 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-18 00:54:52,126 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-18 00:54:52,126 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-18 00:54:52,127 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-18 00:54:52,128 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-18 00:54:52,129 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-18 00:54:52,130 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-18 00:54:52,130 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-18 00:54:52,131 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-18 00:54:52,131 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-18 00:54:52,131 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-18 00:54:52,132 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-18 00:54:52,132 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-18 00:54:52,133 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-12-18 00:54:52,153 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-18 00:54:52,154 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-18 00:54:52,158 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-18 00:54:52,158 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-18 00:54:52,159 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-18 00:54:52,159 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-18 00:54:52,160 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-18 00:54:52,160 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-18 00:54:52,160 INFO L138 SettingsManager]: * Use SBE=true [2021-12-18 00:54:52,160 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-18 00:54:52,161 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-18 00:54:52,161 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-18 00:54:52,161 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-18 00:54:52,161 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-18 00:54:52,161 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-18 00:54:52,162 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-18 00:54:52,162 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-18 00:54:52,162 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-18 00:54:52,162 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-18 00:54:52,163 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-18 00:54:52,171 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-18 00:54:52,171 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 00:54:52,171 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-18 00:54:52,171 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-18 00:54:52,171 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-18 00:54:52,171 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-18 00:54:52,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-18 00:54:52,172 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-18 00:54:52,172 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-18 00:54:52,172 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-18 00:54:52,172 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-18 00:54:52,172 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e96d8d92db1667c6f6142560a7fad2417327f7e06eb532366f9ad7d4ddd7d1f5 [2021-12-18 00:54:52,373 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-18 00:54:52,410 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-18 00:54:52,412 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-18 00:54:52,412 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-18 00:54:52,413 INFO L275 PluginConnector]: CDTParser initialized [2021-12-18 00:54:52,414 INFO L432 ainManager$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 [2021-12-18 00:54:52,460 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/df9d59767/53e5f1cc105d407c978d265ad7d1b9cd/FLAGa703716d5 [2021-12-18 00:54:52,972 INFO L306 CDTParser]: Found 1 translation units. [2021-12-18 00:54:52,972 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness-1.i [2021-12-18 00:54:53,006 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/df9d59767/53e5f1cc105d407c978d265ad7d1b9cd/FLAGa703716d5 [2021-12-18 00:54:53,237 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/df9d59767/53e5f1cc105d407c978d265ad7d1b9cd [2021-12-18 00:54:53,239 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-18 00:54:53,240 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-18 00:54:53,241 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-18 00:54:53,241 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-18 00:54:53,243 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-18 00:54:53,244 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 12:54:53" (1/1) ... [2021-12-18 00:54:53,244 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40c55263 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:53, skipping insertion in model container [2021-12-18 00:54:53,245 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.12 12:54:53" (1/1) ... [2021-12-18 00:54:53,249 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-18 00:54:53,311 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-18 00:54:53,512 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] [2021-12-18 00:54:53,517 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] [2021-12-18 00:54:53,924 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,924 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,925 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,925 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,926 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,940 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,940 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,941 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,942 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,944 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,944 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,945 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:53,945 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,134 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-12-18 00:54:54,135 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-12-18 00:54:54,135 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-12-18 00:54:54,136 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-12-18 00:54:54,137 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-12-18 00:54:54,137 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-12-18 00:54:54,138 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-12-18 00:54:54,138 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-12-18 00:54:54,138 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-12-18 00:54:54,139 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-12-18 00:54:54,211 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-12-18 00:54:54,224 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 00:54:54,243 INFO L203 MainTranslator]: Completed pre-run [2021-12-18 00:54:54,252 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] [2021-12-18 00:54:54,254 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] [2021-12-18 00:54:54,330 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,340 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,341 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,341 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,342 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,346 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,346 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,347 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,347 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,348 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,348 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,349 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,349 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-18 00:54:54,375 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-12-18 00:54:54,381 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-12-18 00:54:54,381 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-12-18 00:54:54,382 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-12-18 00:54:54,383 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-12-18 00:54:54,387 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-12-18 00:54:54,387 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-12-18 00:54:54,388 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-12-18 00:54:54,388 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-12-18 00:54:54,388 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-12-18 00:54:54,408 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-12-18 00:54:54,424 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-18 00:54:54,539 INFO L208 MainTranslator]: Completed translation [2021-12-18 00:54:54,539 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54 WrapperNode [2021-12-18 00:54:54,540 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-18 00:54:54,540 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-18 00:54:54,541 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-18 00:54:54,541 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-18 00:54:54,545 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (1/1) ... [2021-12-18 00:54:54,595 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (1/1) ... [2021-12-18 00:54:54,616 INFO L137 Inliner]: procedures = 679, calls = 1032, calls flagged for inlining = 48, calls inlined = 3, statements flattened = 29 [2021-12-18 00:54:54,616 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-18 00:54:54,617 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-18 00:54:54,617 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-18 00:54:54,617 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-18 00:54:54,623 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (1/1) ... [2021-12-18 00:54:54,623 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (1/1) ... [2021-12-18 00:54:54,626 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (1/1) ... [2021-12-18 00:54:54,626 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (1/1) ... [2021-12-18 00:54:54,632 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (1/1) ... [2021-12-18 00:54:54,635 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (1/1) ... [2021-12-18 00:54:54,637 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (1/1) ... [2021-12-18 00:54:54,640 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-18 00:54:54,640 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-18 00:54:54,640 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-18 00:54:54,641 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-18 00:54:54,641 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (1/1) ... [2021-12-18 00:54:54,656 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-18 00:54:54,665 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 00:54:54,695 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) [2021-12-18 00:54:54,727 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 [2021-12-18 00:54:54,738 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_reset [2021-12-18 00:54:54,738 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_reset [2021-12-18 00:54:54,739 INFO L130 BoogieDeclarations]: Found specification of procedure aws_is_mem_zeroed [2021-12-18 00:54:54,739 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_is_mem_zeroed [2021-12-18 00:54:54,739 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-18 00:54:54,740 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-18 00:54:54,740 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-18 00:54:54,740 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-18 00:54:54,741 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-18 00:54:54,741 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-18 00:54:54,741 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-18 00:54:54,741 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2021-12-18 00:54:54,741 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2021-12-18 00:54:54,741 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-12-18 00:54:54,742 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-12-18 00:54:54,742 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-18 00:54:54,742 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-18 00:54:54,742 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-18 00:54:54,918 INFO L236 CfgBuilder]: Building ICFG [2021-12-18 00:54:54,921 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-18 00:54:55,048 INFO L277 CfgBuilder]: Performing block encoding [2021-12-18 00:54:55,052 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-18 00:54:55,052 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-18 00:54:55,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.12 12:54:55 BoogieIcfgContainer [2021-12-18 00:54:55,054 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-18 00:54:55,055 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-18 00:54:55,055 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-18 00:54:55,063 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-18 00:54:55,064 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.12 12:54:53" (1/3) ... [2021-12-18 00:54:55,064 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26e5cc10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.12 12:54:55, skipping insertion in model container [2021-12-18 00:54:55,064 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.12 12:54:54" (2/3) ... [2021-12-18 00:54:55,065 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26e5cc10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.12 12:54:55, skipping insertion in model container [2021-12-18 00:54:55,065 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.12 12:54:55" (3/3) ... [2021-12-18 00:54:55,066 INFO L111 eAbstractionObserver]: Analyzing ICFG aws_linked_list_node_reset_harness-1.i [2021-12-18 00:54:55,070 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-18 00:54:55,070 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-18 00:54:55,117 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-18 00:54:55,121 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 [2021-12-18 00:54:55,122 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-18 00:54:55,136 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) [2021-12-18 00:54:55,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-18 00:54:55,139 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 00:54:55,140 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] [2021-12-18 00:54:55,140 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-18 00:54:55,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 00:54:55,144 INFO L85 PathProgramCache]: Analyzing trace with hash -527313499, now seen corresponding path program 1 times [2021-12-18 00:54:55,150 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 00:54:55,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897599974] [2021-12-18 00:54:55,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:54:55,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 00:54:55,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:55,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-18 00:54:55,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:55,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-18 00:54:55,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:55,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:54:55,453 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 00:54:55,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897599974] [2021-12-18 00:54:55,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897599974] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 00:54:55,454 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 00:54:55,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-18 00:54:55,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051766717] [2021-12-18 00:54:55,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 00:54:55,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-18 00:54:55,459 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 00:54:55,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-18 00:54:55,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-18 00:54:55,485 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) [2021-12-18 00:54:55,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 00:54:55,505 INFO L93 Difference]: Finished difference Result 75 states and 96 transitions. [2021-12-18 00:54:55,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-18 00:54:55,506 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 [2021-12-18 00:54:55,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 00:54:55,511 INFO L225 Difference]: With dead ends: 75 [2021-12-18 00:54:55,512 INFO L226 Difference]: Without dead ends: 36 [2021-12-18 00:54:55,517 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 [2021-12-18 00:54:55,520 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 [2021-12-18 00:54:55,522 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] [2021-12-18 00:54:55,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-18 00:54:55,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-12-18 00:54:55,554 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) [2021-12-18 00:54:55,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-12-18 00:54:55,557 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 20 [2021-12-18 00:54:55,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 00:54:55,558 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-12-18 00:54:55,558 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) [2021-12-18 00:54:55,558 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-12-18 00:54:55,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-18 00:54:55,560 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 00:54:55,560 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] [2021-12-18 00:54:55,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-18 00:54:55,561 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-18 00:54:55,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 00:54:55,562 INFO L85 PathProgramCache]: Analyzing trace with hash 74286250, now seen corresponding path program 1 times [2021-12-18 00:54:55,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 00:54:55,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362849772] [2021-12-18 00:54:55,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:54:55,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 00:54:55,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:55,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-18 00:54:55,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:55,709 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 00:54:55,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:55,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-18 00:54:55,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:55,781 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:54:55,781 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 00:54:55,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362849772] [2021-12-18 00:54:55,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [362849772] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 00:54:55,781 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 00:54:55,782 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-18 00:54:55,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359383704] [2021-12-18 00:54:55,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 00:54:55,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-18 00:54:55,783 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 00:54:55,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-18 00:54:55,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-18 00:54:55,784 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) [2021-12-18 00:54:55,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 00:54:55,886 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2021-12-18 00:54:55,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-18 00:54:55,886 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 [2021-12-18 00:54:55,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 00:54:55,887 INFO L225 Difference]: With dead ends: 61 [2021-12-18 00:54:55,887 INFO L226 Difference]: Without dead ends: 37 [2021-12-18 00:54:55,888 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 [2021-12-18 00:54:55,889 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 22 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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 [2021-12-18 00:54:55,889 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] [2021-12-18 00:54:55,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-18 00:54:55,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-12-18 00:54:55,893 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) [2021-12-18 00:54:55,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-12-18 00:54:55,894 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 26 [2021-12-18 00:54:55,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 00:54:55,894 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-12-18 00:54:55,894 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) [2021-12-18 00:54:55,894 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-12-18 00:54:55,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-18 00:54:55,895 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 00:54:55,895 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] [2021-12-18 00:54:55,895 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-18 00:54:55,896 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-18 00:54:55,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 00:54:55,896 INFO L85 PathProgramCache]: Analyzing trace with hash -2047649194, now seen corresponding path program 1 times [2021-12-18 00:54:55,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 00:54:55,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727778580] [2021-12-18 00:54:55,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:54:55,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 00:54:55,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:55,939 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-18 00:54:55,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:55,950 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 00:54:55,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:56,024 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-12-18 00:54:56,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:56,059 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:54:56,061 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 00:54:56,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727778580] [2021-12-18 00:54:56,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [727778580] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 00:54:56,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371006153] [2021-12-18 00:54:56,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:54:56,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 00:54:56,062 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 00:54:56,071 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) [2021-12-18 00:54:56,104 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-18 00:54:56,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:56,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-18 00:54:56,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 00:54:56,257 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 [2021-12-18 00:54:56,684 WARN L322 ript$VariableManager]: TermVariabe |aux_div_v_#Ultimate.C_memset_#t~loopctr676_5_65| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-18 00:54:56,684 WARN L322 ript$VariableManager]: TermVariabe |aux_mod_v_#Ultimate.C_memset_#t~loopctr676_5_65| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-18 00:54:56,713 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:54:56,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 00:54:57,011 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 [2021-12-18 00:54:57,014 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 [2021-12-18 00:54:57,058 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:54:57,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371006153] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 00:54:57,059 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 00:54:57,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 8] total 18 [2021-12-18 00:54:57,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347966353] [2021-12-18 00:54:57,060 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 00:54:57,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-18 00:54:57,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 00:54:57,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-18 00:54:57,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-12-18 00:54:57,062 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) [2021-12-18 00:54:57,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 00:54:57,369 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2021-12-18 00:54:57,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-18 00:54:57,369 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 [2021-12-18 00:54:57,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 00:54:57,371 INFO L225 Difference]: With dead ends: 70 [2021-12-18 00:54:57,371 INFO L226 Difference]: Without dead ends: 46 [2021-12-18 00:54:57,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-12-18 00:54:57,372 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 29 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 00:54:57,372 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 187 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 205 Invalid, 0 Unknown, 98 Unchecked, 0.1s Time] [2021-12-18 00:54:57,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-12-18 00:54:57,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2021-12-18 00:54:57,377 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) [2021-12-18 00:54:57,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-12-18 00:54:57,377 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 27 [2021-12-18 00:54:57,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 00:54:57,377 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-12-18 00:54:57,378 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) [2021-12-18 00:54:57,378 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-12-18 00:54:57,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-18 00:54:57,378 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 00:54:57,378 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] [2021-12-18 00:54:57,429 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-18 00:54:57,594 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 [2021-12-18 00:54:57,594 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-18 00:54:57,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 00:54:57,595 INFO L85 PathProgramCache]: Analyzing trace with hash 891828778, now seen corresponding path program 2 times [2021-12-18 00:54:57,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 00:54:57,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131452691] [2021-12-18 00:54:57,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:54:57,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 00:54:57,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:57,645 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-18 00:54:57,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:57,658 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 00:54:57,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:57,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-18 00:54:57,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:57,768 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:54:57,768 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 00:54:57,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131452691] [2021-12-18 00:54:57,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131452691] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 00:54:57,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [570476625] [2021-12-18 00:54:57,769 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 00:54:57,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 00:54:57,769 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 00:54:57,770 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) [2021-12-18 00:54:57,813 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-18 00:54:57,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 00:54:57,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 00:54:57,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 39 conjunts are in the unsatisfiable core [2021-12-18 00:54:57,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 00:54:57,922 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 [2021-12-18 00:54:57,948 INFO L354 Elim1Store]: treesize reduction 30, result has 25.0 percent of original size [2021-12-18 00:54:57,949 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 24 treesize of output 23 [2021-12-18 00:54:58,206 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:54:58,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 00:54:58,490 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 [2021-12-18 00:54:58,589 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 [2021-12-18 00:54:58,592 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 [2021-12-18 00:54:58,673 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:54:58,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [570476625] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 00:54:58,673 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 00:54:58,674 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 9] total 21 [2021-12-18 00:54:58,674 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24676460] [2021-12-18 00:54:58,674 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 00:54:58,674 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-18 00:54:58,674 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 00:54:58,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-18 00:54:58,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2021-12-18 00:54:58,675 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) [2021-12-18 00:54:59,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 00:54:59,025 INFO L93 Difference]: Finished difference Result 71 states and 83 transitions. [2021-12-18 00:54:59,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-18 00:54:59,026 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 [2021-12-18 00:54:59,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 00:54:59,026 INFO L225 Difference]: With dead ends: 71 [2021-12-18 00:54:59,026 INFO L226 Difference]: Without dead ends: 47 [2021-12-18 00:54:59,027 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=100, Invalid=656, Unknown=0, NotChecked=0, Total=756 [2021-12-18 00:54:59,027 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 29 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 172 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 00:54:59,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 241 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 235 Invalid, 0 Unknown, 172 Unchecked, 0.2s Time] [2021-12-18 00:54:59,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-12-18 00:54:59,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2021-12-18 00:54:59,031 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) [2021-12-18 00:54:59,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-12-18 00:54:59,032 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 28 [2021-12-18 00:54:59,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 00:54:59,033 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-12-18 00:54:59,033 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) [2021-12-18 00:54:59,033 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-12-18 00:54:59,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-18 00:54:59,034 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 00:54:59,034 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] [2021-12-18 00:54:59,053 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-18 00:54:59,251 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 [2021-12-18 00:54:59,251 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-18 00:54:59,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 00:54:59,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1821332694, now seen corresponding path program 3 times [2021-12-18 00:54:59,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 00:54:59,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116333802] [2021-12-18 00:54:59,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:54:59,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 00:54:59,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:59,301 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-18 00:54:59,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:59,311 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 00:54:59,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:59,409 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-18 00:54:59,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:54:59,417 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:54:59,417 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 00:54:59,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116333802] [2021-12-18 00:54:59,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116333802] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 00:54:59,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627365917] [2021-12-18 00:54:59,417 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-18 00:54:59,417 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 00:54:59,418 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 00:54:59,419 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) [2021-12-18 00:54:59,420 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-18 00:54:59,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-18 00:54:59,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 00:54:59,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 39 conjunts are in the unsatisfiable core [2021-12-18 00:54:59,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 00:54:59,549 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 [2021-12-18 00:54:59,581 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-18 00:54:59,581 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 [2021-12-18 00:54:59,622 INFO L354 Elim1Store]: treesize reduction 72, result has 22.6 percent of original size [2021-12-18 00:54:59,623 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 [2021-12-18 00:54:59,900 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:54:59,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 00:55:00,266 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 [2021-12-18 00:55:00,270 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 308 treesize of output 304 [2021-12-18 00:55:00,446 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:55:00,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627365917] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 00:55:00,446 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 00:55:00,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 10] total 24 [2021-12-18 00:55:00,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826529096] [2021-12-18 00:55:00,448 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 00:55:00,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-18 00:55:00,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 00:55:00,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-18 00:55:00,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-12-18 00:55:00,452 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) [2021-12-18 00:55:00,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 00:55:00,875 INFO L93 Difference]: Finished difference Result 83 states and 101 transitions. [2021-12-18 00:55:00,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-18 00:55:00,876 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 [2021-12-18 00:55:00,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 00:55:00,877 INFO L225 Difference]: With dead ends: 83 [2021-12-18 00:55:00,877 INFO L226 Difference]: Without dead ends: 59 [2021-12-18 00:55:00,877 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=124, Invalid=868, Unknown=0, NotChecked=0, Total=992 [2021-12-18 00:55:00,878 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 31 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 172 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-18 00:55:00,878 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 184 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 239 Invalid, 0 Unknown, 172 Unchecked, 0.2s Time] [2021-12-18 00:55:00,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-12-18 00:55:00,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2021-12-18 00:55:00,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 38 states have internal predecessors, (43), 8 states have call successors, (8), 5 states have call predecessors, (8), 7 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-12-18 00:55:00,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2021-12-18 00:55:00,885 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 29 [2021-12-18 00:55:00,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 00:55:00,886 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2021-12-18 00:55:00,886 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) [2021-12-18 00:55:00,886 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2021-12-18 00:55:00,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-18 00:55:00,887 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 00:55:00,887 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] [2021-12-18 00:55:00,904 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-18 00:55:01,103 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 [2021-12-18 00:55:01,104 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-18 00:55:01,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 00:55:01,104 INFO L85 PathProgramCache]: Analyzing trace with hash -996879181, now seen corresponding path program 1 times [2021-12-18 00:55:01,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 00:55:01,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613360791] [2021-12-18 00:55:01,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:55:01,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 00:55:01,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:01,140 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-18 00:55:01,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:01,152 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 00:55:01,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:01,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-12-18 00:55:01,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:01,179 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-18 00:55:01,179 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 00:55:01,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613360791] [2021-12-18 00:55:01,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613360791] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-18 00:55:01,179 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-18 00:55:01,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-18 00:55:01,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125616962] [2021-12-18 00:55:01,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-18 00:55:01,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-18 00:55:01,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 00:55:01,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-18 00:55:01,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-18 00:55:01,181 INFO L87 Difference]: Start difference. First operand 51 states and 61 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) [2021-12-18 00:55:01,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 00:55:01,267 INFO L93 Difference]: Finished difference Result 61 states and 73 transitions. [2021-12-18 00:55:01,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-18 00:55:01,267 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 [2021-12-18 00:55:01,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 00:55:01,268 INFO L225 Difference]: With dead ends: 61 [2021-12-18 00:55:01,268 INFO L226 Difference]: Without dead ends: 59 [2021-12-18 00:55:01,269 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 [2021-12-18 00:55:01,270 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 [2021-12-18 00:55:01,270 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] [2021-12-18 00:55:01,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-12-18 00:55:01,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-12-18 00:55:01,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 39 states have (on average 1.205128205128205) internal successors, (47), 43 states have internal predecessors, (47), 9 states have call successors, (9), 6 states have call predecessors, (9), 9 states have return successors, (14), 8 states have call predecessors, (14), 8 states have call successors, (14) [2021-12-18 00:55:01,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2021-12-18 00:55:01,278 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 30 [2021-12-18 00:55:01,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 00:55:01,278 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2021-12-18 00:55:01,278 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) [2021-12-18 00:55:01,279 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2021-12-18 00:55:01,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-18 00:55:01,279 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 00:55:01,280 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 00:55:01,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-18 00:55:01,280 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-18 00:55:01,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 00:55:01,280 INFO L85 PathProgramCache]: Analyzing trace with hash 1668252970, now seen corresponding path program 4 times [2021-12-18 00:55:01,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 00:55:01,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306865984] [2021-12-18 00:55:01,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:55:01,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 00:55:01,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:01,330 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-18 00:55:01,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:01,342 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 00:55:01,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:01,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-12-18 00:55:01,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:01,578 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:55:01,578 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 00:55:01,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306865984] [2021-12-18 00:55:01,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1306865984] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 00:55:01,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145145066] [2021-12-18 00:55:01,578 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-18 00:55:01,579 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 00:55:01,579 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 00:55:01,580 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) [2021-12-18 00:55:01,580 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-18 00:55:01,734 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-18 00:55:01,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 00:55:01,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 54 conjunts are in the unsatisfiable core [2021-12-18 00:55:01,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 00:55:01,765 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 [2021-12-18 00:55:01,787 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-18 00:55:01,787 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 [2021-12-18 00:55:01,819 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-12-18 00:55:01,820 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 [2021-12-18 00:55:01,869 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-12-18 00:55:01,869 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 [2021-12-18 00:55:01,912 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-12-18 00:55:01,913 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 [2021-12-18 00:55:01,969 INFO L354 Elim1Store]: treesize reduction 129, result has 19.4 percent of original size [2021-12-18 00:55:01,969 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 [2021-12-18 00:55:04,401 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:55:04,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 00:55:05,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 42 [2021-12-18 00:55:05,223 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 5364 treesize of output 5356 [2021-12-18 00:55:06,893 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-12-18 00:55:06,893 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-18 00:55:06,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-12-18 00:55:06,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60869611] [2021-12-18 00:55:06,893 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-18 00:55:06,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-18 00:55:06,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 00:55:06,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-18 00:55:06,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=872, Unknown=1, NotChecked=0, Total=992 [2021-12-18 00:55:06,894 INFO L87 Difference]: Start difference. First operand 58 states and 70 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 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) [2021-12-18 00:55:07,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 00:55:07,111 INFO L93 Difference]: Finished difference Result 96 states and 116 transitions. [2021-12-18 00:55:07,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-18 00:55:07,111 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 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 32 [2021-12-18 00:55:07,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 00:55:07,112 INFO L225 Difference]: With dead ends: 96 [2021-12-18 00:55:07,112 INFO L226 Difference]: Without dead ends: 54 [2021-12-18 00:55:07,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=141, Invalid=1118, Unknown=1, NotChecked=0, Total=1260 [2021-12-18 00:55:07,113 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 26 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-18 00:55:07,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 149 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-18 00:55:07,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-18 00:55:07,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2021-12-18 00:55:07,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 36 states have internal predecessors, (38), 8 states have call successors, (8), 6 states have call predecessors, (8), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-18 00:55:07,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-12-18 00:55:07,118 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 32 [2021-12-18 00:55:07,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 00:55:07,119 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-12-18 00:55:07,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 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) [2021-12-18 00:55:07,119 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-12-18 00:55:07,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-18 00:55:07,120 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 00:55:07,120 INFO L514 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-18 00:55:07,143 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-12-18 00:55:07,320 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 [2021-12-18 00:55:07,320 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-18 00:55:07,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 00:55:07,321 INFO L85 PathProgramCache]: Analyzing trace with hash 120678870, now seen corresponding path program 5 times [2021-12-18 00:55:07,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 00:55:07,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960716371] [2021-12-18 00:55:07,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:55:07,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 00:55:07,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:07,384 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-18 00:55:07,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:07,398 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 00:55:07,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:07,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-18 00:55:07,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:07,559 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:55:07,559 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 00:55:07,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960716371] [2021-12-18 00:55:07,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1960716371] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 00:55:07,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626411490] [2021-12-18 00:55:07,560 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-18 00:55:07,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 00:55:07,560 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 00:55:07,572 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) [2021-12-18 00:55:07,573 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-18 00:55:08,021 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-18 00:55:08,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 00:55:08,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 68 conjunts are in the unsatisfiable core [2021-12-18 00:55:08,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 00:55:08,050 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 [2021-12-18 00:55:08,081 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-18 00:55:08,081 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 [2021-12-18 00:55:08,131 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-12-18 00:55:08,131 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 [2021-12-18 00:55:08,180 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-12-18 00:55:08,180 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 [2021-12-18 00:55:08,244 INFO L354 Elim1Store]: treesize reduction 208, result has 16.5 percent of original size [2021-12-18 00:55:08,244 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 [2021-12-18 00:55:08,326 INFO L354 Elim1Store]: treesize reduction 295, result has 14.7 percent of original size [2021-12-18 00:55:08,326 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 [2021-12-18 00:55:08,428 INFO L354 Elim1Store]: treesize reduction 384, result has 13.7 percent of original size [2021-12-18 00:55:08,428 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 [2021-12-18 00:55:11,032 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:55:11,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 00:55:12,153 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 50 treesize of output 48 [2021-12-18 00:55:12,156 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 2672 treesize of output 2670 [2021-12-18 00:55:12,281 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:55:12,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1626411490] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 00:55:12,282 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 00:55:12,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 14] total 36 [2021-12-18 00:55:12,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563055354] [2021-12-18 00:55:12,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 00:55:12,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-18 00:55:12,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 00:55:12,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-18 00:55:12,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1096, Unknown=1, NotChecked=0, Total=1260 [2021-12-18 00:55:12,283 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 34 states have internal predecessors, (57), 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) [2021-12-18 00:55:12,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 00:55:12,985 INFO L93 Difference]: Finished difference Result 86 states and 99 transitions. [2021-12-18 00:55:12,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-18 00:55:12,986 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 34 states have internal predecessors, (57), 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 [2021-12-18 00:55:12,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 00:55:12,986 INFO L225 Difference]: With dead ends: 86 [2021-12-18 00:55:12,986 INFO L226 Difference]: Without dead ends: 55 [2021-12-18 00:55:12,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=284, Invalid=1971, Unknown=1, NotChecked=0, Total=2256 [2021-12-18 00:55:12,988 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 23 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 150 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-18 00:55:12,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 229 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 393 Invalid, 0 Unknown, 150 Unchecked, 0.3s Time] [2021-12-18 00:55:12,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-12-18 00:55:12,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-12-18 00:55:12,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 41 states have internal predecessors, (44), 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) [2021-12-18 00:55:12,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2021-12-18 00:55:12,994 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 33 [2021-12-18 00:55:12,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 00:55:12,998 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2021-12-18 00:55:12,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 34 states have internal predecessors, (57), 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) [2021-12-18 00:55:12,998 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2021-12-18 00:55:12,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-18 00:55:12,999 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 00:55:12,999 INFO L514 BasicCegarLoop]: trace histogram [8, 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] [2021-12-18 00:55:13,007 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-18 00:55:13,207 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 [2021-12-18 00:55:13,207 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-18 00:55:13,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 00:55:13,208 INFO L85 PathProgramCache]: Analyzing trace with hash -1075671656, now seen corresponding path program 1 times [2021-12-18 00:55:13,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 00:55:13,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288914792] [2021-12-18 00:55:13,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:55:13,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 00:55:13,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:13,278 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-18 00:55:13,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:13,288 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 00:55:13,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:13,505 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-18 00:55:13,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:13,519 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-18 00:55:13,519 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 00:55:13,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288914792] [2021-12-18 00:55:13,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1288914792] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 00:55:13,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926471611] [2021-12-18 00:55:13,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:55:13,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 00:55:13,520 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 00:55:13,524 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) [2021-12-18 00:55:13,525 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-18 00:55:13,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:13,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 78 conjunts are in the unsatisfiable core [2021-12-18 00:55:13,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 00:55:13,737 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 [2021-12-18 00:55:13,785 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-18 00:55:13,785 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 [2021-12-18 00:55:13,822 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-12-18 00:55:13,823 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 [2021-12-18 00:55:13,877 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-12-18 00:55:13,877 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 [2021-12-18 00:55:13,955 INFO L354 Elim1Store]: treesize reduction 208, result has 16.5 percent of original size [2021-12-18 00:55:13,955 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 [2021-12-18 00:55:14,034 INFO L354 Elim1Store]: treesize reduction 295, result has 14.7 percent of original size [2021-12-18 00:55:14,035 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 [2021-12-18 00:55:14,118 INFO L354 Elim1Store]: treesize reduction 396, result has 13.3 percent of original size [2021-12-18 00:55:14,118 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 [2021-12-18 00:55:14,209 INFO L354 Elim1Store]: treesize reduction 497, result has 12.5 percent of original size [2021-12-18 00:55:14,209 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 84 treesize of output 101 [2021-12-18 00:55:21,272 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:55:21,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 00:55:24,308 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 115 treesize of output 111 [2021-12-18 00:55:24,323 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-12-18 00:55:24,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11741 treesize of output 11735 [2021-12-18 00:55:24,881 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:55:24,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926471611] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-18 00:55:24,882 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-18 00:55:24,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 18] total 45 [2021-12-18 00:55:24,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967435714] [2021-12-18 00:55:24,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-18 00:55:24,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-18 00:55:24,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-18 00:55:24,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-18 00:55:24,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1773, Unknown=3, NotChecked=0, Total=1980 [2021-12-18 00:55:24,883 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 45 states, 45 states have (on average 1.511111111111111) internal successors, (68), 43 states have internal predecessors, (68), 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) [2021-12-18 00:55:28,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-18 00:55:28,222 INFO L93 Difference]: Finished difference Result 104 states and 127 transitions. [2021-12-18 00:55:28,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-18 00:55:28,223 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.511111111111111) internal successors, (68), 43 states have internal predecessors, (68), 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 [2021-12-18 00:55:28,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-18 00:55:28,225 INFO L225 Difference]: With dead ends: 104 [2021-12-18 00:55:28,226 INFO L226 Difference]: Without dead ends: 69 [2021-12-18 00:55:28,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=501, Invalid=3786, Unknown=3, NotChecked=0, Total=4290 [2021-12-18 00:55:28,227 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 32 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 709 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 875 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 709 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 128 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-12-18 00:55:28,227 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 238 Invalid, 875 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 709 Invalid, 0 Unknown, 128 Unchecked, 1.0s Time] [2021-12-18 00:55:28,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-18 00:55:28,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 59. [2021-12-18 00:55:28,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 45 states have internal predecessors, (50), 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) [2021-12-18 00:55:28,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2021-12-18 00:55:28,233 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 37 [2021-12-18 00:55:28,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-18 00:55:28,233 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2021-12-18 00:55:28,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.511111111111111) internal successors, (68), 43 states have internal predecessors, (68), 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) [2021-12-18 00:55:28,234 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2021-12-18 00:55:28,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-18 00:55:28,234 INFO L506 BasicCegarLoop]: Found error trace [2021-12-18 00:55:28,234 INFO L514 BasicCegarLoop]: trace histogram [9, 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] [2021-12-18 00:55:28,277 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-18 00:55:28,456 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 [2021-12-18 00:55:28,456 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-18 00:55:28,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-18 00:55:28,457 INFO L85 PathProgramCache]: Analyzing trace with hash -3963754, now seen corresponding path program 2 times [2021-12-18 00:55:28,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-18 00:55:28,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041866991] [2021-12-18 00:55:28,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-18 00:55:28,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-18 00:55:28,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:28,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-12-18 00:55:28,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:28,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-18 00:55:28,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:28,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-18 00:55:28,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-18 00:55:28,771 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-18 00:55:28,772 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-18 00:55:28,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041866991] [2021-12-18 00:55:28,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041866991] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-18 00:55:28,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316052752] [2021-12-18 00:55:28,772 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-18 00:55:28,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-18 00:55:28,772 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-18 00:55:28,793 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) [2021-12-18 00:55:28,794 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-18 00:55:28,962 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-18 00:55:28,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-18 00:55:28,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 85 conjunts are in the unsatisfiable core [2021-12-18 00:55:28,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-18 00:55:28,995 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 [2021-12-18 00:55:29,026 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-12-18 00:55:29,026 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 [2021-12-18 00:55:29,073 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-12-18 00:55:29,074 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 [2021-12-18 00:55:29,128 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-12-18 00:55:29,128 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 [2021-12-18 00:55:29,194 INFO L354 Elim1Store]: treesize reduction 208, result has 16.5 percent of original size [2021-12-18 00:55:29,194 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 [2021-12-18 00:55:29,285 INFO L354 Elim1Store]: treesize reduction 295, result has 14.7 percent of original size [2021-12-18 00:55:29,286 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 [2021-12-18 00:55:29,388 INFO L354 Elim1Store]: treesize reduction 396, result has 13.3 percent of original size [2021-12-18 00:55:29,388 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 [2021-12-18 00:55:29,537 INFO L354 Elim1Store]: treesize reduction 511, result has 12.2 percent of original size [2021-12-18 00:55:29,537 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 85 treesize of output 102 [2021-12-18 00:55:29,704 INFO L354 Elim1Store]: treesize reduction 624, result has 11.5 percent of original size [2021-12-18 00:55:29,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 94 treesize of output 114 [2021-12-18 00:55:41,007 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-18 00:55:41,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-18 00:55:42,889 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 54 treesize of output 52 [2021-12-18 00:55:43,716 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 64 treesize of output 62 [2021-12-18 00:55:43,725 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 204828 treesize of output 204764 Killed by 15