./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/aws-c-common/aws_linked_list_prev_harness.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_prev_harness.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 0aec0bb8b8715e014581c4eef5e1e25c7e0452a528f8abdf2f2a721d17b0fa7f --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-16 03:20:44,696 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-16 03:20:44,697 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-16 03:20:44,737 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-16 03:20:44,737 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-16 03:20:44,738 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-16 03:20:44,739 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-16 03:20:44,740 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-16 03:20:44,741 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-16 03:20:44,742 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-16 03:20:44,743 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-16 03:20:44,743 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-16 03:20:44,745 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-16 03:20:44,747 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-16 03:20:44,748 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-16 03:20:44,750 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-16 03:20:44,751 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-16 03:20:44,755 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-16 03:20:44,756 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-16 03:20:44,760 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-16 03:20:44,761 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-16 03:20:44,762 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-16 03:20:44,767 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-16 03:20:44,768 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-16 03:20:44,770 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-16 03:20:44,772 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-16 03:20:44,773 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-16 03:20:44,773 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-16 03:20:44,773 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-16 03:20:44,774 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-16 03:20:44,774 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-16 03:20:44,775 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-16 03:20:44,775 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-16 03:20:44,776 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-16 03:20:44,776 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-16 03:20:44,777 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-16 03:20:44,777 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-16 03:20:44,778 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-16 03:20:44,778 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-16 03:20:44,778 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-16 03:20:44,779 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-16 03:20:44,779 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-12-16 03:20:44,806 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-16 03:20:44,807 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-16 03:20:44,807 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-16 03:20:44,807 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-16 03:20:44,808 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-16 03:20:44,808 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-16 03:20:44,808 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-16 03:20:44,808 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-16 03:20:44,808 INFO L138 SettingsManager]: * Use SBE=true [2021-12-16 03:20:44,808 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-16 03:20:44,809 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-16 03:20:44,809 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-16 03:20:44,809 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-16 03:20:44,809 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-16 03:20:44,809 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-16 03:20:44,809 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-16 03:20:44,809 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-16 03:20:44,809 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-16 03:20:44,809 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-16 03:20:44,809 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-16 03:20:44,810 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-16 03:20:44,810 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 03:20:44,810 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-16 03:20:44,810 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-16 03:20:44,810 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-16 03:20:44,810 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-16 03:20:44,810 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-16 03:20:44,810 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-16 03:20:44,810 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-16 03:20:44,811 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-16 03:20:44,811 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-16 03:20:44,811 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0aec0bb8b8715e014581c4eef5e1e25c7e0452a528f8abdf2f2a721d17b0fa7f [2021-12-16 03:20:44,977 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-16 03:20:44,993 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-16 03:20:44,996 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-16 03:20:44,996 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-16 03:20:44,997 INFO L275 PluginConnector]: CDTParser initialized [2021-12-16 03:20:44,998 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/aws-c-common/aws_linked_list_prev_harness.i [2021-12-16 03:20:45,058 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11e90ffc0/df754f3b6c014af1ba37021b62b66411/FLAG0807d3d05 [2021-12-16 03:20:45,554 INFO L306 CDTParser]: Found 1 translation units. [2021-12-16 03:20:45,555 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/aws-c-common/aws_linked_list_prev_harness.i [2021-12-16 03:20:45,588 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11e90ffc0/df754f3b6c014af1ba37021b62b66411/FLAG0807d3d05 [2021-12-16 03:20:46,071 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11e90ffc0/df754f3b6c014af1ba37021b62b66411 [2021-12-16 03:20:46,074 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-16 03:20:46,075 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-16 03:20:46,077 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-16 03:20:46,077 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-16 03:20:46,079 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-16 03:20:46,080 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 03:20:46" (1/1) ... [2021-12-16 03:20:46,080 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68d47b8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:46, skipping insertion in model container [2021-12-16 03:20:46,080 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 03:20:46" (1/1) ... [2021-12-16 03:20:46,085 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-16 03:20:46,161 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-16 03:20:46,375 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_prev_harness.i[4494,4507] [2021-12-16 03:20:46,380 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_prev_harness.i[4554,4567] [2021-12-16 03:20:46,811 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,812 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,813 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,813 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,815 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,838 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,839 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,840 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,840 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,843 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,845 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,845 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:46,845 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,023 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-12-16 03:20:47,027 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-12-16 03:20:47,028 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-12-16 03:20:47,028 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-12-16 03:20:47,029 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-12-16 03:20:47,029 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-12-16 03:20:47,030 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-12-16 03:20:47,030 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-12-16 03:20:47,030 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-12-16 03:20:47,031 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-12-16 03:20:47,114 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-12-16 03:20:47,136 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 03:20:47,148 INFO L203 MainTranslator]: Completed pre-run [2021-12-16 03:20:47,157 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_prev_harness.i[4494,4507] [2021-12-16 03:20:47,157 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_prev_harness.i[4554,4567] [2021-12-16 03:20:47,185 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,186 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,186 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,186 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,186 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,220 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,221 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,221 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,222 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,222 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,222 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,223 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,223 WARN L1533 CHandler]: Possible shadowing of function index [2021-12-16 03:20:47,252 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-12-16 03:20:47,252 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-12-16 03:20:47,253 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-12-16 03:20:47,253 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-12-16 03:20:47,257 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-12-16 03:20:47,258 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-12-16 03:20:47,258 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-12-16 03:20:47,259 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-12-16 03:20:47,259 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-12-16 03:20:47,260 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-12-16 03:20:47,281 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-12-16 03:20:47,293 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 03:20:47,416 INFO L208 MainTranslator]: Completed translation [2021-12-16 03:20:47,417 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47 WrapperNode [2021-12-16 03:20:47,417 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-16 03:20:47,418 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-16 03:20:47,418 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-16 03:20:47,418 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-16 03:20:47,422 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (1/1) ... [2021-12-16 03:20:47,468 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (1/1) ... [2021-12-16 03:20:47,499 INFO L137 Inliner]: procedures = 679, calls = 1039, calls flagged for inlining = 50, calls inlined = 4, statements flattened = 58 [2021-12-16 03:20:47,499 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-16 03:20:47,500 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-16 03:20:47,500 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-16 03:20:47,500 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-16 03:20:47,505 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (1/1) ... [2021-12-16 03:20:47,506 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (1/1) ... [2021-12-16 03:20:47,508 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (1/1) ... [2021-12-16 03:20:47,508 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (1/1) ... [2021-12-16 03:20:47,515 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (1/1) ... [2021-12-16 03:20:47,516 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (1/1) ... [2021-12-16 03:20:47,518 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (1/1) ... [2021-12-16 03:20:47,520 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-16 03:20:47,521 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-16 03:20:47,521 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-16 03:20:47,521 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-16 03:20:47,522 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (1/1) ... [2021-12-16 03:20:47,530 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 03:20:47,539 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 03:20:47,550 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) [2021-12-16 03:20:47,565 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 [2021-12-16 03:20:47,588 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-16 03:20:47,588 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-16 03:20:47,589 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-16 03:20:47,589 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_next_is_valid [2021-12-16 03:20:47,589 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_next_is_valid [2021-12-16 03:20:47,589 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-16 03:20:47,590 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-16 03:20:47,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-16 03:20:47,590 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-16 03:20:47,590 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-12-16 03:20:47,591 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-12-16 03:20:47,591 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-16 03:20:47,591 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-16 03:20:47,591 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-16 03:20:47,592 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_prev_is_valid [2021-12-16 03:20:47,592 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_prev_is_valid [2021-12-16 03:20:47,592 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-16 03:20:47,778 INFO L236 CfgBuilder]: Building ICFG [2021-12-16 03:20:47,779 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-16 03:20:47,897 INFO L277 CfgBuilder]: Performing block encoding [2021-12-16 03:20:47,901 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-16 03:20:47,901 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-12-16 03:20:47,903 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.12 03:20:47 BoogieIcfgContainer [2021-12-16 03:20:47,903 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-16 03:20:47,904 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-16 03:20:47,904 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-16 03:20:47,906 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-16 03:20:47,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.12 03:20:46" (1/3) ... [2021-12-16 03:20:47,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c1ce126 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.12 03:20:47, skipping insertion in model container [2021-12-16 03:20:47,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 03:20:47" (2/3) ... [2021-12-16 03:20:47,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c1ce126 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.12 03:20:47, skipping insertion in model container [2021-12-16 03:20:47,907 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.12 03:20:47" (3/3) ... [2021-12-16 03:20:47,907 INFO L111 eAbstractionObserver]: Analyzing ICFG aws_linked_list_prev_harness.i [2021-12-16 03:20:47,910 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-16 03:20:47,911 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-16 03:20:47,944 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-16 03:20:47,948 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 [2021-12-16 03:20:47,948 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-16 03:20:47,959 INFO L276 IsEmpty]: Start isEmpty. Operand has 50 states, 32 states have (on average 1.21875) internal successors, (39), 33 states have internal predecessors, (39), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-16 03:20:47,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-16 03:20:47,962 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 03:20:47,963 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 03:20:47,963 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 03:20:47,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 03:20:47,966 INFO L85 PathProgramCache]: Analyzing trace with hash 1117195627, now seen corresponding path program 1 times [2021-12-16 03:20:47,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 03:20:47,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203044142] [2021-12-16 03:20:47,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:20:47,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 03:20:48,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:48,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-16 03:20:48,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:48,229 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-16 03:20:48,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:48,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-16 03:20:48,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:48,261 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-16 03:20:48,261 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 03:20:48,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203044142] [2021-12-16 03:20:48,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203044142] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 03:20:48,262 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 03:20:48,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-16 03:20:48,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028857359] [2021-12-16 03:20:48,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 03:20:48,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-16 03:20:48,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 03:20:48,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-16 03:20:48,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-16 03:20:48,301 INFO L87 Difference]: Start difference. First operand has 50 states, 32 states have (on average 1.21875) internal successors, (39), 33 states have internal predecessors, (39), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-16 03:20:48,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 03:20:48,318 INFO L93 Difference]: Finished difference Result 94 states and 124 transitions. [2021-12-16 03:20:48,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-16 03:20:48,321 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-12-16 03:20:48,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 03:20:48,343 INFO L225 Difference]: With dead ends: 94 [2021-12-16 03:20:48,343 INFO L226 Difference]: Without dead ends: 45 [2021-12-16 03:20:48,346 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-16 03:20:48,350 INFO L933 BasicCegarLoop]: 61 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, 61 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 [2021-12-16 03:20:48,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 03:20:48,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-16 03:20:48,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-12-16 03:20:48,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 29 states have internal predecessors, (33), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-16 03:20:48,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 56 transitions. [2021-12-16 03:20:48,388 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 56 transitions. Word has length 28 [2021-12-16 03:20:48,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 03:20:48,389 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 56 transitions. [2021-12-16 03:20:48,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-16 03:20:48,389 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 56 transitions. [2021-12-16 03:20:48,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-16 03:20:48,390 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 03:20:48,391 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 03:20:48,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-16 03:20:48,391 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 03:20:48,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 03:20:48,392 INFO L85 PathProgramCache]: Analyzing trace with hash 96127273, now seen corresponding path program 1 times [2021-12-16 03:20:48,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 03:20:48,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237576218] [2021-12-16 03:20:48,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:20:48,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 03:20:48,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:48,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-16 03:20:48,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:48,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-16 03:20:48,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:48,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-16 03:20:48,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:48,812 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 03:20:48,813 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 03:20:48,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237576218] [2021-12-16 03:20:48,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237576218] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 03:20:48,813 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 03:20:48,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-16 03:20:48,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918278619] [2021-12-16 03:20:48,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 03:20:48,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-16 03:20:48,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 03:20:48,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-16 03:20:48,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-12-16 03:20:48,817 INFO L87 Difference]: Start difference. First operand 45 states and 56 transitions. Second operand has 9 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-16 03:20:49,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 03:20:49,029 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2021-12-16 03:20:49,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-16 03:20:49,029 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 28 [2021-12-16 03:20:49,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 03:20:49,033 INFO L225 Difference]: With dead ends: 56 [2021-12-16 03:20:49,033 INFO L226 Difference]: Without dead ends: 54 [2021-12-16 03:20:49,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-12-16 03:20:49,035 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 18 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 03:20:49,036 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 271 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 03:20:49,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-16 03:20:49,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-12-16 03:20:49,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 35 states have internal predecessors, (38), 13 states have call successors, (13), 5 states have call predecessors, (13), 6 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) [2021-12-16 03:20:49,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 66 transitions. [2021-12-16 03:20:49,055 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 66 transitions. Word has length 28 [2021-12-16 03:20:49,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 03:20:49,055 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 66 transitions. [2021-12-16 03:20:49,055 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-16 03:20:49,056 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 66 transitions. [2021-12-16 03:20:49,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-16 03:20:49,057 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 03:20:49,057 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 03:20:49,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-16 03:20:49,059 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 03:20:49,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 03:20:49,059 INFO L85 PathProgramCache]: Analyzing trace with hash -713219353, now seen corresponding path program 1 times [2021-12-16 03:20:49,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 03:20:49,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991178150] [2021-12-16 03:20:49,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:20:49,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 03:20:49,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:49,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-16 03:20:49,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:49,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-16 03:20:49,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:49,260 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-16 03:20:49,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:49,318 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-16 03:20:49,319 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 03:20:49,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991178150] [2021-12-16 03:20:49,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991178150] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 03:20:49,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981978397] [2021-12-16 03:20:49,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:20:49,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 03:20:49,322 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 03:20:49,333 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) [2021-12-16 03:20:49,335 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-16 03:20:49,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:49,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 51 conjunts are in the unsatisfiable core [2021-12-16 03:20:49,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 03:20:49,487 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 14 [2021-12-16 03:20:49,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 03:20:49,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-16 03:20:49,495 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 10 treesize of output 8 [2021-12-16 03:20:49,794 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-16 03:20:49,800 INFO L354 Elim1Store]: treesize reduction 17, result has 15.0 percent of original size [2021-12-16 03:20:49,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 25 [2021-12-16 03:20:50,151 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 03:20:50,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 03:20:50,357 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 10 treesize of output 4 [2021-12-16 03:20:50,439 INFO L354 Elim1Store]: treesize reduction 8, result has 46.7 percent of original size [2021-12-16 03:20:50,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 25 [2021-12-16 03:20:50,489 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 03:20:50,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981978397] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 03:20:50,489 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 03:20:50,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 12] total 27 [2021-12-16 03:20:50,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781927674] [2021-12-16 03:20:50,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 03:20:50,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-16 03:20:50,490 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 03:20:50,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-16 03:20:50,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=609, Unknown=0, NotChecked=0, Total=702 [2021-12-16 03:20:50,490 INFO L87 Difference]: Start difference. First operand 53 states and 66 transitions. Second operand has 27 states, 25 states have (on average 1.72) internal successors, (43), 26 states have internal predecessors, (43), 5 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) [2021-12-16 03:20:50,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 03:20:50,998 INFO L93 Difference]: Finished difference Result 129 states and 162 transitions. [2021-12-16 03:20:50,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-16 03:20:50,999 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.72) internal successors, (43), 26 states have internal predecessors, (43), 5 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) Word has length 28 [2021-12-16 03:20:50,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 03:20:51,000 INFO L225 Difference]: With dead ends: 129 [2021-12-16 03:20:51,000 INFO L226 Difference]: Without dead ends: 76 [2021-12-16 03:20:51,001 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=172, Invalid=1160, Unknown=0, NotChecked=0, Total=1332 [2021-12-16 03:20:51,001 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 48 mSDsluCounter, 482 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 171 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 03:20:51,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 538 Invalid, 551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 357 Invalid, 0 Unknown, 171 Unchecked, 0.2s Time] [2021-12-16 03:20:51,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-16 03:20:51,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2021-12-16 03:20:51,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 49 states have (on average 1.183673469387755) internal successors, (58), 52 states have internal predecessors, (58), 13 states have call successors, (13), 7 states have call predecessors, (13), 9 states have return successors, (19), 12 states have call predecessors, (19), 12 states have call successors, (19) [2021-12-16 03:20:51,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 90 transitions. [2021-12-16 03:20:51,009 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 90 transitions. Word has length 28 [2021-12-16 03:20:51,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 03:20:51,009 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 90 transitions. [2021-12-16 03:20:51,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.72) internal successors, (43), 26 states have internal predecessors, (43), 5 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) [2021-12-16 03:20:51,010 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 90 transitions. [2021-12-16 03:20:51,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-16 03:20:51,010 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 03:20:51,010 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 03:20:51,037 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-16 03:20:51,227 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 [2021-12-16 03:20:51,228 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 03:20:51,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 03:20:51,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1106246363, now seen corresponding path program 1 times [2021-12-16 03:20:51,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 03:20:51,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672526960] [2021-12-16 03:20:51,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:20:51,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 03:20:51,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-16 03:20:51,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,286 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-16 03:20:51,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,300 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-16 03:20:51,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,320 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 03:20:51,320 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 03:20:51,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672526960] [2021-12-16 03:20:51,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672526960] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 03:20:51,321 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 03:20:51,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-16 03:20:51,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716201854] [2021-12-16 03:20:51,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 03:20:51,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-16 03:20:51,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 03:20:51,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-16 03:20:51,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-16 03:20:51,323 INFO L87 Difference]: Start difference. First operand 72 states and 90 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-16 03:20:51,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 03:20:51,341 INFO L93 Difference]: Finished difference Result 133 states and 164 transitions. [2021-12-16 03:20:51,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-16 03:20:51,341 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 28 [2021-12-16 03:20:51,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 03:20:51,345 INFO L225 Difference]: With dead ends: 133 [2021-12-16 03:20:51,345 INFO L226 Difference]: Without dead ends: 71 [2021-12-16 03:20:51,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-16 03:20:51,348 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 13 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 03:20:51,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 143 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 03:20:51,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-12-16 03:20:51,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 65. [2021-12-16 03:20:51,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 45 states have (on average 1.2) internal successors, (54), 46 states have internal predecessors, (54), 12 states have call successors, (12), 7 states have call predecessors, (12), 7 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-12-16 03:20:51,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-12-16 03:20:51,362 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 28 [2021-12-16 03:20:51,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 03:20:51,362 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-12-16 03:20:51,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-16 03:20:51,362 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-12-16 03:20:51,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-16 03:20:51,364 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 03:20:51,365 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 03:20:51,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-16 03:20:51,365 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 03:20:51,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 03:20:51,366 INFO L85 PathProgramCache]: Analyzing trace with hash 695086179, now seen corresponding path program 1 times [2021-12-16 03:20:51,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 03:20:51,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199995262] [2021-12-16 03:20:51,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:20:51,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 03:20:51,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,557 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-16 03:20:51,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-16 03:20:51,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-16 03:20:51,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,688 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-16 03:20:51,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-12-16 03:20:51,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,808 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 03:20:51,808 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 03:20:51,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199995262] [2021-12-16 03:20:51,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199995262] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 03:20:51,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845094015] [2021-12-16 03:20:51,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:20:51,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 03:20:51,809 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 03:20:51,810 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) [2021-12-16 03:20:51,811 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-16 03:20:51,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:20:51,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 101 conjunts are in the unsatisfiable core [2021-12-16 03:20:51,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 03:20:51,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 03:20:51,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 03:20:51,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2021-12-16 03:20:51,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 03:20:51,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2021-12-16 03:20:51,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 03:20:51,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-12-16 03:20:51,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-12-16 03:20:51,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 8 treesize of output 7 [2021-12-16 03:20:51,978 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 18 treesize of output 12 [2021-12-16 03:20:53,333 INFO L354 Elim1Store]: treesize reduction 69, result has 25.0 percent of original size [2021-12-16 03:20:53,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 10 new quantified variables, introduced 15 case distinctions, treesize of input 221 treesize of output 133 [2021-12-16 03:20:53,356 INFO L354 Elim1Store]: treesize reduction 74, result has 8.6 percent of original size [2021-12-16 03:20:53,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 8 new quantified variables, introduced 10 case distinctions, treesize of input 81 treesize of output 43 [2021-12-16 03:20:53,418 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 03:20:53,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 03:21:08,199 WARN L227 SmtUtils]: Spent 10.17s on a formula simplification that was a NOOP. DAG size: 26 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-16 03:21:18,617 WARN L227 SmtUtils]: Spent 10.22s on a formula simplification that was a NOOP. DAG size: 29 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-16 03:21:23,209 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 03:21:23,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845094015] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 03:21:23,209 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-16 03:21:23,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 16] total 45 [2021-12-16 03:21:23,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669268819] [2021-12-16 03:21:23,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-16 03:21:23,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-16 03:21:23,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 03:21:23,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-16 03:21:23,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1814, Unknown=3, NotChecked=0, Total=1980 [2021-12-16 03:21:23,212 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 45 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 38 states have internal predecessors, (80), 14 states have call successors, (17), 4 states have call predecessors, (17), 11 states have return successors, (15), 11 states have call predecessors, (15), 12 states have call successors, (15) [2021-12-16 03:21:23,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 03:21:23,671 INFO L93 Difference]: Finished difference Result 100 states and 112 transitions. [2021-12-16 03:21:23,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-16 03:21:23,671 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 38 states have internal predecessors, (80), 14 states have call successors, (17), 4 states have call predecessors, (17), 11 states have return successors, (15), 11 states have call predecessors, (15), 12 states have call successors, (15) Word has length 42 [2021-12-16 03:21:23,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 03:21:23,672 INFO L225 Difference]: With dead ends: 100 [2021-12-16 03:21:23,672 INFO L226 Difference]: Without dead ends: 90 [2021-12-16 03:21:23,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 58 SyntacticMatches, 7 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 30.2s TimeCoverageRelationStatistics Valid=203, Invalid=2344, Unknown=3, NotChecked=0, Total=2550 [2021-12-16 03:21:23,673 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 60 mSDsluCounter, 833 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 873 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 163 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 03:21:23,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 873 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 314 Invalid, 0 Unknown, 163 Unchecked, 0.2s Time] [2021-12-16 03:21:23,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-12-16 03:21:23,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 78. [2021-12-16 03:21:23,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 56 states have internal predecessors, (61), 13 states have call successors, (13), 9 states have call predecessors, (13), 10 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2021-12-16 03:21:23,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 87 transitions. [2021-12-16 03:21:23,679 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 87 transitions. Word has length 42 [2021-12-16 03:21:23,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 03:21:23,680 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 87 transitions. [2021-12-16 03:21:23,680 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 38 states have internal predecessors, (80), 14 states have call successors, (17), 4 states have call predecessors, (17), 11 states have return successors, (15), 11 states have call predecessors, (15), 12 states have call successors, (15) [2021-12-16 03:21:23,680 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 87 transitions. [2021-12-16 03:21:23,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-16 03:21:23,681 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 03:21:23,681 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 03:21:23,717 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-16 03:21:23,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 03:21:23,882 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 03:21:23,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 03:21:23,882 INFO L85 PathProgramCache]: Analyzing trace with hash -114260447, now seen corresponding path program 1 times [2021-12-16 03:21:23,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 03:21:23,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181855424] [2021-12-16 03:21:23,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:21:23,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 03:21:23,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:23,992 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-16 03:21:24,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-16 03:21:24,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,015 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-16 03:21:24,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,093 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-16 03:21:24,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-12-16 03:21:24,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,202 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 03:21:24,202 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 03:21:24,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181855424] [2021-12-16 03:21:24,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181855424] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 03:21:24,202 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 03:21:24,203 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-12-16 03:21:24,203 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826449175] [2021-12-16 03:21:24,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 03:21:24,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-16 03:21:24,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 03:21:24,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-16 03:21:24,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240 [2021-12-16 03:21:24,204 INFO L87 Difference]: Start difference. First operand 78 states and 87 transitions. Second operand has 16 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 03:21:24,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 03:21:24,563 INFO L93 Difference]: Finished difference Result 122 states and 140 transitions. [2021-12-16 03:21:24,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-16 03:21:24,564 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) Word has length 42 [2021-12-16 03:21:24,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 03:21:24,565 INFO L225 Difference]: With dead ends: 122 [2021-12-16 03:21:24,565 INFO L226 Difference]: Without dead ends: 87 [2021-12-16 03:21:24,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-12-16 03:21:24,566 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 51 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 03:21:24,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 298 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-16 03:21:24,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-12-16 03:21:24,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 80. [2021-12-16 03:21:24,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 56 states have (on average 1.125) internal successors, (63), 58 states have internal predecessors, (63), 13 states have call successors, (13), 9 states have call predecessors, (13), 10 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2021-12-16 03:21:24,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 89 transitions. [2021-12-16 03:21:24,572 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 89 transitions. Word has length 42 [2021-12-16 03:21:24,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 03:21:24,573 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 89 transitions. [2021-12-16 03:21:24,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 14 states have internal predecessors, (31), 6 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 03:21:24,573 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 89 transitions. [2021-12-16 03:21:24,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-16 03:21:24,573 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 03:21:24,574 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 03:21:24,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-16 03:21:24,574 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 03:21:24,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 03:21:24,574 INFO L85 PathProgramCache]: Analyzing trace with hash -507287457, now seen corresponding path program 1 times [2021-12-16 03:21:24,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 03:21:24,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272445909] [2021-12-16 03:21:24,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:21:24,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 03:21:24,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-16 03:21:24,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-16 03:21:24,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-16 03:21:24,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-16 03:21:24,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-12-16 03:21:24,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,689 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-16 03:21:24,690 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 03:21:24,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272445909] [2021-12-16 03:21:24,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272445909] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 03:21:24,690 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 03:21:24,690 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-16 03:21:24,691 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589133725] [2021-12-16 03:21:24,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 03:21:24,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 03:21:24,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 03:21:24,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 03:21:24,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-16 03:21:24,692 INFO L87 Difference]: Start difference. First operand 80 states and 89 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-16 03:21:24,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 03:21:24,764 INFO L93 Difference]: Finished difference Result 124 states and 140 transitions. [2021-12-16 03:21:24,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-16 03:21:24,764 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 42 [2021-12-16 03:21:24,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 03:21:24,767 INFO L225 Difference]: With dead ends: 124 [2021-12-16 03:21:24,767 INFO L226 Difference]: Without dead ends: 79 [2021-12-16 03:21:24,768 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-12-16 03:21:24,769 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 18 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 03:21:24,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 212 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 03:21:24,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-12-16 03:21:24,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 74. [2021-12-16 03:21:24,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 53 states have internal predecessors, (57), 12 states have call successors, (12), 9 states have call predecessors, (12), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-16 03:21:24,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 80 transitions. [2021-12-16 03:21:24,778 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 80 transitions. Word has length 42 [2021-12-16 03:21:24,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 03:21:24,778 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 80 transitions. [2021-12-16 03:21:24,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-16 03:21:24,778 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 80 transitions. [2021-12-16 03:21:24,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-16 03:21:24,781 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 03:21:24,781 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 03:21:24,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-16 03:21:24,782 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 03:21:24,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 03:21:24,782 INFO L85 PathProgramCache]: Analyzing trace with hash 709260864, now seen corresponding path program 1 times [2021-12-16 03:21:24,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 03:21:24,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130906116] [2021-12-16 03:21:24,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:21:24,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 03:21:24,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-16 03:21:24,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,872 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-16 03:21:24,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-16 03:21:24,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,890 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-16 03:21:24,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,897 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-12-16 03:21:24,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,904 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-12-16 03:21:24,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:24,911 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-16 03:21:24,911 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 03:21:24,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130906116] [2021-12-16 03:21:24,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130906116] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 03:21:24,911 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 03:21:24,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-16 03:21:24,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856502617] [2021-12-16 03:21:24,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 03:21:24,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 03:21:24,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 03:21:24,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 03:21:24,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-16 03:21:24,913 INFO L87 Difference]: Start difference. First operand 74 states and 80 transitions. Second operand has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-16 03:21:24,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 03:21:24,995 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-12-16 03:21:24,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-16 03:21:24,996 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 48 [2021-12-16 03:21:24,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 03:21:24,998 INFO L225 Difference]: With dead ends: 80 [2021-12-16 03:21:24,998 INFO L226 Difference]: Without dead ends: 78 [2021-12-16 03:21:24,998 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-16 03:21:24,999 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 9 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 03:21:24,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 219 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 03:21:25,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-16 03:21:25,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-12-16 03:21:25,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 56 states have internal predecessors, (60), 12 states have call successors, (12), 10 states have call predecessors, (12), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-16 03:21:25,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 83 transitions. [2021-12-16 03:21:25,012 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 83 transitions. Word has length 48 [2021-12-16 03:21:25,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 03:21:25,012 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 83 transitions. [2021-12-16 03:21:25,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-16 03:21:25,013 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 83 transitions. [2021-12-16 03:21:25,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-12-16 03:21:25,016 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 03:21:25,016 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 03:21:25,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-16 03:21:25,016 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 03:21:25,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 03:21:25,017 INFO L85 PathProgramCache]: Analyzing trace with hash -593356994, now seen corresponding path program 1 times [2021-12-16 03:21:25,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 03:21:25,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522161851] [2021-12-16 03:21:25,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:21:25,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 03:21:25,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:25,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-16 03:21:25,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:25,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-12-16 03:21:25,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:25,188 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-16 03:21:25,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:25,257 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-12-16 03:21:25,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:25,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-12-16 03:21:25,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:25,315 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-12-16 03:21:25,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:25,328 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-12-16 03:21:25,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:25,335 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-12-16 03:21:25,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:25,413 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 17 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-16 03:21:25,413 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 03:21:25,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522161851] [2021-12-16 03:21:25,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522161851] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 03:21:25,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118589106] [2021-12-16 03:21:25,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 03:21:25,414 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 03:21:25,414 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 03:21:25,419 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) [2021-12-16 03:21:25,423 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-16 03:21:25,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 03:21:25,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 131 conjunts are in the unsatisfiable core [2021-12-16 03:21:25,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 03:21:25,557 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 16 [2021-12-16 03:21:25,561 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 16 [2021-12-16 03:21:25,571 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-12-16 03:21:25,571 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 40 [2021-12-16 03:21:25,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 03:21:25,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 24 [2021-12-16 03:21:25,580 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 22 treesize of output 14 [2021-12-16 03:21:28,096 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 25 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 03:21:28,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 03:21:40,636 WARN L227 SmtUtils]: Spent 10.01s on a formula simplification that was a NOOP. DAG size: 24 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-16 03:21:52,802 WARN L227 SmtUtils]: Spent 10.10s on a formula simplification that was a NOOP. DAG size: 28 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)