/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/discover_list.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 23:57:51,257 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 23:57:51,259 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 23:57:51,288 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 23:57:51,288 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 23:57:51,291 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 23:57:51,293 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 23:57:51,297 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 23:57:51,299 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 23:57:51,303 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 23:57:51,303 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 23:57:51,304 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 23:57:51,305 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 23:57:51,306 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 23:57:51,307 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 23:57:51,308 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 23:57:51,311 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 23:57:51,311 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 23:57:51,313 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 23:57:51,330 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 23:57:51,331 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 23:57:51,331 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 23:57:51,332 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 23:57:51,332 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 23:57:51,334 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 23:57:51,342 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 23:57:51,342 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 23:57:51,343 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 23:57:51,344 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-02 23:57:51,352 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 23:57:51,352 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 23:57:51,353 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 23:57:51,353 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 23:57:51,353 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 23:57:51,353 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 23:57:51,353 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 23:57:51,354 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 23:57:51,354 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 23:57:51,354 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 23:57:51,354 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 23:57:51,354 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 23:57:51,354 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 23:57:51,354 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 23:57:51,354 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 23:57:51,354 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 23:57:51,355 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 23:57:51,355 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 23:57:51,355 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 23:57:51,355 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 23:57:51,355 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-02 23:57:51,355 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 23:57:51,355 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-02 23:57:51,355 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 23:57:51,599 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 23:57:51,613 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 23:57:51,615 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 23:57:51,616 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 23:57:51,617 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 23:57:51,618 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/discover_list.c [2021-05-02 23:57:51,667 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fbd28caad/7abb9b9add174352b71d666e36e24673/FLAG72530efee [2021-05-02 23:57:52,093 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 23:57:52,094 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/discover_list.c [2021-05-02 23:57:52,103 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fbd28caad/7abb9b9add174352b71d666e36e24673/FLAG72530efee [2021-05-02 23:57:52,116 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fbd28caad/7abb9b9add174352b71d666e36e24673 [2021-05-02 23:57:52,119 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 23:57:52,121 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 23:57:52,124 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 23:57:52,124 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 23:57:52,128 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 23:57:52,131 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:57:52" (1/1) ... [2021-05-02 23:57:52,131 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4982535a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52, skipping insertion in model container [2021-05-02 23:57:52,132 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:57:52" (1/1) ... [2021-05-02 23:57:52,136 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 23:57:52,164 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 23:57:52,291 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/discover_list.c[4997,5010] [2021-05-02 23:57:52,428 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:57:52,450 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 23:57:52,464 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/discover_list.c[4997,5010] [2021-05-02 23:57:52,498 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:57:52,516 INFO L208 MainTranslator]: Completed translation [2021-05-02 23:57:52,516 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52 WrapperNode [2021-05-02 23:57:52,516 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 23:57:52,517 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 23:57:52,517 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 23:57:52,517 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 23:57:52,530 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52" (1/1) ... [2021-05-02 23:57:52,530 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52" (1/1) ... [2021-05-02 23:57:52,563 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52" (1/1) ... [2021-05-02 23:57:52,564 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52" (1/1) ... [2021-05-02 23:57:52,596 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52" (1/1) ... [2021-05-02 23:57:52,612 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52" (1/1) ... [2021-05-02 23:57:52,617 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52" (1/1) ... [2021-05-02 23:57:52,632 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 23:57:52,632 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 23:57:52,633 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 23:57:52,633 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 23:57:52,633 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 23:57:52,699 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 23:57:52,700 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 23:57:52,700 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 23:57:52,700 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 23:57:52,700 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_get_func_def_resp_len [2021-05-02 23:57:52,700 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_is_naa5 [2021-05-02 23:57:52,701 INFO L138 BoogieDeclarations]: Found implementation of procedure dStrHex [2021-05-02 23:57:52,701 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_get_num [2021-05-02 23:57:52,701 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_get_llnum [2021-05-02 23:57:52,701 INFO L138 BoogieDeclarations]: Found implementation of procedure do_discover_list [2021-05-02 23:57:52,701 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 23:57:52,701 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2021-05-02 23:57:52,701 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 23:57:52,702 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 23:57:52,702 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 23:57:52,702 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 23:57:52,702 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-05-02 23:57:52,702 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 23:57:52,702 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure sscanf [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure memset [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure strcmp [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure strchr [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure strlen [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure getopt_long [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure smp_initiator_open [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure smp_send_req [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure smp_get_func_def_resp_len [2021-05-02 23:57:52,704 INFO L130 BoogieDeclarations]: Found specification of procedure smp_is_naa5 [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure dStrHex [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure smp_get_num [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure smp_get_llnum [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure do_discover_list [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure main6 [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure sprintf [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure toupper [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 23:57:52,705 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-05-02 23:57:52,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 23:57:52,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 23:57:53,723 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 23:57:53,724 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 23:57:53,725 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:57:53 BoogieIcfgContainer [2021-05-02 23:57:53,725 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 23:57:53,727 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 23:57:53,727 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 23:57:53,730 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 23:57:53,730 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:57:52" (1/3) ... [2021-05-02 23:57:53,730 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22889ce1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:57:53, skipping insertion in model container [2021-05-02 23:57:53,731 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:57:52" (2/3) ... [2021-05-02 23:57:53,731 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22889ce1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:57:53, skipping insertion in model container [2021-05-02 23:57:53,731 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:57:53" (3/3) ... [2021-05-02 23:57:53,732 INFO L111 eAbstractionObserver]: Analyzing ICFG discover_list.c [2021-05-02 23:57:53,736 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-02 23:57:53,740 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 23:57:53,752 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 23:57:53,769 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 23:57:53,769 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 23:57:53,769 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-02 23:57:53,769 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 23:57:53,769 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 23:57:53,770 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 23:57:53,770 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 23:57:53,770 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 23:57:53,782 INFO L276 IsEmpty]: Start isEmpty. Operand has 91 states, 69 states have (on average 1.4927536231884058) internal successors, (103), 71 states have internal predecessors, (103), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 23:57:53,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 23:57:53,792 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:57:53,793 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:57:53,793 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:57:53,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:57:53,797 INFO L82 PathProgramCache]: Analyzing trace with hash 467458188, now seen corresponding path program 1 times [2021-05-02 23:57:53,803 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:57:53,803 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282406786] [2021-05-02 23:57:53,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:57:53,848 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:57:53,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:54,233 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-02 23:57:54,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:57:54,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:54,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:57:54,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:54,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-02 23:57:54,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:54,295 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:57:54,296 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:57:54,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282406786] [2021-05-02 23:57:54,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [282406786] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:57:54,298 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:57:54,298 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 23:57:54,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81763443] [2021-05-02 23:57:54,301 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 23:57:54,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:57:54,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 23:57:54,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 23:57:54,313 INFO L87 Difference]: Start difference. First operand has 91 states, 69 states have (on average 1.4927536231884058) internal successors, (103), 71 states have internal predecessors, (103), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 3 states have internal predecessors, (33), 2 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:54,444 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:57:54,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:57:54,833 INFO L93 Difference]: Finished difference Result 205 states and 313 transitions. [2021-05-02 23:57:54,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 23:57:54,835 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 3 states have internal predecessors, (33), 2 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-05-02 23:57:54,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:57:54,846 INFO L225 Difference]: With dead ends: 205 [2021-05-02 23:57:54,846 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 23:57:54,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 255.6ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:57:54,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 23:57:54,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 76. [2021-05-02 23:57:54,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 58 states have (on average 1.293103448275862) internal successors, (75), 58 states have internal predecessors, (75), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:57:54,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2021-05-02 23:57:54,890 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 46 [2021-05-02 23:57:54,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:57:54,890 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2021-05-02 23:57:54,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 3 states have internal predecessors, (33), 2 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:54,891 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2021-05-02 23:57:54,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 23:57:54,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:57:54,892 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:57:54,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 23:57:54,892 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:57:54,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:57:54,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1776525110, now seen corresponding path program 1 times [2021-05-02 23:57:54,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:57:54,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638948196] [2021-05-02 23:57:54,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:57:54,895 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:57:54,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:55,092 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-02 23:57:55,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:57:55,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:55,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:57:55,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:55,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-02 23:57:55,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:55,148 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:57:55,148 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:57:55,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638948196] [2021-05-02 23:57:55,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1638948196] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:57:55,151 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:57:55,152 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 23:57:55,152 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284376082] [2021-05-02 23:57:55,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 23:57:55,166 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:57:55,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 23:57:55,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:57:55,167 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand has 6 states, 6 states have (on average 6.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:55,292 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:57:55,507 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:57:55,643 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2021-05-02 23:57:55,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:57:55,866 INFO L93 Difference]: Finished difference Result 136 states and 178 transitions. [2021-05-02 23:57:55,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 23:57:55,867 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-05-02 23:57:55,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:57:55,869 INFO L225 Difference]: With dead ends: 136 [2021-05-02 23:57:55,869 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 23:57:55,873 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 518.6ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:57:55,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 23:57:55,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-02 23:57:55,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 59 states have (on average 1.2881355932203389) internal successors, (76), 59 states have internal predecessors, (76), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:57:55,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 99 transitions. [2021-05-02 23:57:55,898 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 99 transitions. Word has length 46 [2021-05-02 23:57:55,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:57:55,899 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 99 transitions. [2021-05-02 23:57:55,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:55,899 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 99 transitions. [2021-05-02 23:57:55,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 23:57:55,900 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:57:55,900 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:57:55,900 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 23:57:55,900 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:57:55,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:57:55,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1831279328, now seen corresponding path program 1 times [2021-05-02 23:57:55,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:57:55,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819911122] [2021-05-02 23:57:55,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:57:55,906 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:57:55,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:56,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:57:56,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:56,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:57:56,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:56,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-02 23:57:56,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:56,095 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:57:56,095 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:57:56,095 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819911122] [2021-05-02 23:57:56,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1819911122] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:57:56,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:57:56,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 23:57:56,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977453529] [2021-05-02 23:57:56,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 23:57:56,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:57:56,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 23:57:56,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 23:57:56,097 INFO L87 Difference]: Start difference. First operand 77 states and 99 transitions. Second operand has 7 states, 7 states have (on average 5.428571428571429) internal successors, (38), 5 states have internal predecessors, (38), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:56,429 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:57:56,653 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-02 23:57:56,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:57:56,890 INFO L93 Difference]: Finished difference Result 138 states and 180 transitions. [2021-05-02 23:57:56,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 23:57:56,890 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.428571428571429) internal successors, (38), 5 states have internal predecessors, (38), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 48 [2021-05-02 23:57:56,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:57:56,891 INFO L225 Difference]: With dead ends: 138 [2021-05-02 23:57:56,891 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 23:57:56,892 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 523.0ms TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:57:56,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 23:57:56,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-02 23:57:56,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 60 states have (on average 1.2833333333333334) internal successors, (77), 60 states have internal predecessors, (77), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:57:56,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 100 transitions. [2021-05-02 23:57:56,901 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 100 transitions. Word has length 48 [2021-05-02 23:57:56,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:57:56,901 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 100 transitions. [2021-05-02 23:57:56,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.428571428571429) internal successors, (38), 5 states have internal predecessors, (38), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:56,901 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 100 transitions. [2021-05-02 23:57:56,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 23:57:56,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:57:56,902 INFO L523 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:57:56,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 23:57:56,902 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:57:56,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:57:56,902 INFO L82 PathProgramCache]: Analyzing trace with hash -110265974, now seen corresponding path program 2 times [2021-05-02 23:57:56,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:57:56,903 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [777841757] [2021-05-02 23:57:56,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:57:56,905 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:57:56,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:57,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:57:57,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:57,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:57:57,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:57,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-02 23:57:57,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:57,100 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:57:57,101 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:57:57,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [777841757] [2021-05-02 23:57:57,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [777841757] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:57:57,103 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:57:57,103 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:57:57,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467185321] [2021-05-02 23:57:57,104 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:57:57,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:57:57,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:57:57,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:57:57,105 INFO L87 Difference]: Start difference. First operand 78 states and 100 transitions. Second operand has 8 states, 8 states have (on average 4.875) internal successors, (39), 6 states have internal predecessors, (39), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:57,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:57:57,909 INFO L93 Difference]: Finished difference Result 140 states and 182 transitions. [2021-05-02 23:57:57,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 23:57:57,910 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 6 states have internal predecessors, (39), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 50 [2021-05-02 23:57:57,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:57:57,911 INFO L225 Difference]: With dead ends: 140 [2021-05-02 23:57:57,911 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 23:57:57,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 563.9ms TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-05-02 23:57:57,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 23:57:57,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-02 23:57:57,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 61 states have (on average 1.278688524590164) internal successors, (78), 61 states have internal predecessors, (78), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:57:57,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 101 transitions. [2021-05-02 23:57:57,921 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 101 transitions. Word has length 50 [2021-05-02 23:57:57,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:57:57,921 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 101 transitions. [2021-05-02 23:57:57,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 6 states have internal predecessors, (39), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:57,922 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 101 transitions. [2021-05-02 23:57:57,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 23:57:57,922 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:57:57,922 INFO L523 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:57:57,922 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 23:57:57,922 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:57:57,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:57:57,923 INFO L82 PathProgramCache]: Analyzing trace with hash -523287008, now seen corresponding path program 3 times [2021-05-02 23:57:57,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:57:57,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255097264] [2021-05-02 23:57:57,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:57:57,925 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:57:57,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:58,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:57:58,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:58,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:57:58,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:58,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-05-02 23:57:58,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:58,136 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:57:58,136 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:57:58,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255097264] [2021-05-02 23:57:58,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [255097264] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:57:58,137 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:57:58,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 23:57:58,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182907584] [2021-05-02 23:57:58,137 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 23:57:58,137 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:57:58,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 23:57:58,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:57:58,139 INFO L87 Difference]: Start difference. First operand 79 states and 101 transitions. Second operand has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 7 states have internal predecessors, (40), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:59,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:57:59,055 INFO L93 Difference]: Finished difference Result 142 states and 184 transitions. [2021-05-02 23:57:59,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 23:57:59,056 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 7 states have internal predecessors, (40), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 52 [2021-05-02 23:57:59,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:57:59,057 INFO L225 Difference]: With dead ends: 142 [2021-05-02 23:57:59,057 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 23:57:59,057 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 696.4ms TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:57:59,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 23:57:59,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-05-02 23:57:59,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 62 states have (on average 1.2741935483870968) internal successors, (79), 62 states have internal predecessors, (79), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:57:59,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 102 transitions. [2021-05-02 23:57:59,067 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 102 transitions. Word has length 52 [2021-05-02 23:57:59,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:57:59,067 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 102 transitions. [2021-05-02 23:57:59,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 7 states have internal predecessors, (40), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:59,067 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 102 transitions. [2021-05-02 23:57:59,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 23:57:59,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:57:59,068 INFO L523 BasicCegarLoop]: trace histogram [8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:57:59,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 23:57:59,068 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:57:59,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:57:59,068 INFO L82 PathProgramCache]: Analyzing trace with hash -1966742966, now seen corresponding path program 4 times [2021-05-02 23:57:59,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:57:59,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817609044] [2021-05-02 23:57:59,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:57:59,070 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:57:59,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:59,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:57:59,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:59,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:57:59,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:59,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-02 23:57:59,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:57:59,274 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:57:59,274 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:57:59,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817609044] [2021-05-02 23:57:59,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1817609044] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:57:59,274 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:57:59,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:57:59,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193521527] [2021-05-02 23:57:59,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:57:59,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:57:59,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:57:59,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:57:59,275 INFO L87 Difference]: Start difference. First operand 80 states and 102 transitions. Second operand has 10 states, 10 states have (on average 4.1) internal successors, (41), 8 states have internal predecessors, (41), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:57:59,574 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:57:59,793 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:58:00,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:00,321 INFO L93 Difference]: Finished difference Result 144 states and 186 transitions. [2021-05-02 23:58:00,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 23:58:00,322 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.1) internal successors, (41), 8 states have internal predecessors, (41), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 54 [2021-05-02 23:58:00,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:00,323 INFO L225 Difference]: With dead ends: 144 [2021-05-02 23:58:00,323 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 23:58:00,323 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 819.0ms TimeCoverageRelationStatistics Valid=79, Invalid=193, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:58:00,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 23:58:00,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-05-02 23:58:00,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 63 states have (on average 1.2698412698412698) internal successors, (80), 63 states have internal predecessors, (80), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:00,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 103 transitions. [2021-05-02 23:58:00,332 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 103 transitions. Word has length 54 [2021-05-02 23:58:00,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:00,332 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 103 transitions. [2021-05-02 23:58:00,332 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.1) internal successors, (41), 8 states have internal predecessors, (41), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:00,332 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 103 transitions. [2021-05-02 23:58:00,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 23:58:00,333 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:00,333 INFO L523 BasicCegarLoop]: trace histogram [10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:00,333 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 23:58:00,333 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:00,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:00,334 INFO L82 PathProgramCache]: Analyzing trace with hash -127655584, now seen corresponding path program 5 times [2021-05-02 23:58:00,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:00,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1798419907] [2021-05-02 23:58:00,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:00,336 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:00,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:00,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:00,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:00,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:00,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:00,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-02 23:58:00,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:00,538 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:00,538 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:00,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1798419907] [2021-05-02 23:58:00,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1798419907] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:00,538 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:00,538 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-02 23:58:00,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785372873] [2021-05-02 23:58:00,539 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 23:58:00,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:00,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 23:58:00,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:58:00,541 INFO L87 Difference]: Start difference. First operand 81 states and 103 transitions. Second operand has 11 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 9 states have internal predecessors, (42), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:00,871 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:58:01,499 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-02 23:58:01,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:01,695 INFO L93 Difference]: Finished difference Result 146 states and 188 transitions. [2021-05-02 23:58:01,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 23:58:01,698 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 9 states have internal predecessors, (42), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 56 [2021-05-02 23:58:01,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:01,700 INFO L225 Difference]: With dead ends: 146 [2021-05-02 23:58:01,700 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 23:58:01,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 942.0ms TimeCoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:58:01,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 23:58:01,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-05-02 23:58:01,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 64 states have (on average 1.265625) internal successors, (81), 64 states have internal predecessors, (81), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:01,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 104 transitions. [2021-05-02 23:58:01,722 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 104 transitions. Word has length 56 [2021-05-02 23:58:01,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:01,722 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 104 transitions. [2021-05-02 23:58:01,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 9 states have internal predecessors, (42), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:01,722 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 104 transitions. [2021-05-02 23:58:01,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 23:58:01,723 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:01,723 INFO L523 BasicCegarLoop]: trace histogram [12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:01,723 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 23:58:01,724 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:01,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:01,724 INFO L82 PathProgramCache]: Analyzing trace with hash -330196214, now seen corresponding path program 6 times [2021-05-02 23:58:01,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:01,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420522414] [2021-05-02 23:58:01,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:01,726 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:01,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:01,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:01,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:01,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:01,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:01,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-02 23:58:01,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:01,967 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:01,967 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:01,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [420522414] [2021-05-02 23:58:01,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [420522414] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:01,967 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:01,967 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-02 23:58:01,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800609697] [2021-05-02 23:58:01,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 23:58:01,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:01,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 23:58:01,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-05-02 23:58:01,968 INFO L87 Difference]: Start difference. First operand 82 states and 104 transitions. Second operand has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:03,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:03,228 INFO L93 Difference]: Finished difference Result 148 states and 190 transitions. [2021-05-02 23:58:03,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 23:58:03,228 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 58 [2021-05-02 23:58:03,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:03,235 INFO L225 Difference]: With dead ends: 148 [2021-05-02 23:58:03,235 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 23:58:03,235 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 1021.8ms TimeCoverageRelationStatistics Valid=124, Invalid=296, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:58:03,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 23:58:03,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-05-02 23:58:03,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 65 states have internal predecessors, (82), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:03,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 105 transitions. [2021-05-02 23:58:03,245 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 105 transitions. Word has length 58 [2021-05-02 23:58:03,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:03,245 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 105 transitions. [2021-05-02 23:58:03,245 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:03,245 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 105 transitions. [2021-05-02 23:58:03,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 23:58:03,246 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:03,246 INFO L523 BasicCegarLoop]: trace histogram [14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:03,246 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 23:58:03,246 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:03,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:03,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1036407648, now seen corresponding path program 7 times [2021-05-02 23:58:03,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:03,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049331577] [2021-05-02 23:58:03,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:03,248 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:03,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:03,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:03,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:03,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:03,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:03,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-05-02 23:58:03,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:03,479 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:03,479 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:03,479 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049331577] [2021-05-02 23:58:03,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1049331577] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:03,479 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:03,479 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-02 23:58:03,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941526127] [2021-05-02 23:58:03,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 23:58:03,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:03,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 23:58:03,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2021-05-02 23:58:03,480 INFO L87 Difference]: Start difference. First operand 83 states and 105 transitions. Second operand has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:03,592 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:58:04,336 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:58:04,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:04,899 INFO L93 Difference]: Finished difference Result 150 states and 192 transitions. [2021-05-02 23:58:04,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 23:58:04,900 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 60 [2021-05-02 23:58:04,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:04,901 INFO L225 Difference]: With dead ends: 150 [2021-05-02 23:58:04,901 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 23:58:04,901 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1189.7ms TimeCoverageRelationStatistics Valid=151, Invalid=355, Unknown=0, NotChecked=0, Total=506 [2021-05-02 23:58:04,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 23:58:04,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-05-02 23:58:04,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 66 states have (on average 1.2575757575757576) internal successors, (83), 66 states have internal predecessors, (83), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:04,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 106 transitions. [2021-05-02 23:58:04,911 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 106 transitions. Word has length 60 [2021-05-02 23:58:04,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:04,911 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 106 transitions. [2021-05-02 23:58:04,911 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:04,911 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 106 transitions. [2021-05-02 23:58:04,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 23:58:04,914 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:04,914 INFO L523 BasicCegarLoop]: trace histogram [16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:04,915 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-02 23:58:04,915 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:04,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:04,915 INFO L82 PathProgramCache]: Analyzing trace with hash -2059623478, now seen corresponding path program 8 times [2021-05-02 23:58:04,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:04,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701546967] [2021-05-02 23:58:04,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:04,918 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:04,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:05,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:05,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:05,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:05,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:05,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-02 23:58:05,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:05,151 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:05,151 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:05,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701546967] [2021-05-02 23:58:05,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [701546967] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:05,151 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:05,151 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-02 23:58:05,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771528929] [2021-05-02 23:58:05,151 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 23:58:05,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:05,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 23:58:05,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-05-02 23:58:05,152 INFO L87 Difference]: Start difference. First operand 84 states and 106 transitions. Second operand has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 12 states have internal predecessors, (45), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:05,585 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:58:06,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:06,753 INFO L93 Difference]: Finished difference Result 152 states and 194 transitions. [2021-05-02 23:58:06,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 23:58:06,755 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 12 states have internal predecessors, (45), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 62 [2021-05-02 23:58:06,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:06,756 INFO L225 Difference]: With dead ends: 152 [2021-05-02 23:58:06,756 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 23:58:06,757 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 1242.7ms TimeCoverageRelationStatistics Valid=181, Invalid=419, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:58:06,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 23:58:06,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-02 23:58:06,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 67 states have (on average 1.2537313432835822) internal successors, (84), 67 states have internal predecessors, (84), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:06,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 107 transitions. [2021-05-02 23:58:06,766 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 107 transitions. Word has length 62 [2021-05-02 23:58:06,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:06,767 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 107 transitions. [2021-05-02 23:58:06,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 12 states have internal predecessors, (45), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:06,767 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 107 transitions. [2021-05-02 23:58:06,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 23:58:06,768 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:06,768 INFO L523 BasicCegarLoop]: trace histogram [18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:06,768 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 23:58:06,768 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:06,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:06,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1482430496, now seen corresponding path program 9 times [2021-05-02 23:58:06,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:06,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088688416] [2021-05-02 23:58:06,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:06,772 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:06,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:06,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:06,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:06,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:06,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:07,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-05-02 23:58:07,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:07,015 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:07,015 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:07,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088688416] [2021-05-02 23:58:07,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2088688416] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:07,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:07,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-02 23:58:07,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145961553] [2021-05-02 23:58:07,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 23:58:07,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:07,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 23:58:07,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:58:07,017 INFO L87 Difference]: Start difference. First operand 85 states and 107 transitions. Second operand has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 13 states have internal predecessors, (46), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:07,579 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:58:08,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:08,734 INFO L93 Difference]: Finished difference Result 154 states and 196 transitions. [2021-05-02 23:58:08,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 23:58:08,734 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 13 states have internal predecessors, (46), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 64 [2021-05-02 23:58:08,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:08,736 INFO L225 Difference]: With dead ends: 154 [2021-05-02 23:58:08,736 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 23:58:08,737 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 1350.1ms TimeCoverageRelationStatistics Valid=214, Invalid=488, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:58:08,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 23:58:08,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-05-02 23:58:08,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 68 states have (on average 1.25) internal successors, (85), 68 states have internal predecessors, (85), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:08,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 108 transitions. [2021-05-02 23:58:08,749 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 108 transitions. Word has length 64 [2021-05-02 23:58:08,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:08,749 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 108 transitions. [2021-05-02 23:58:08,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 13 states have internal predecessors, (46), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:08,749 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 108 transitions. [2021-05-02 23:58:08,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 23:58:08,750 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:08,750 INFO L523 BasicCegarLoop]: trace histogram [20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:08,750 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-02 23:58:08,750 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:08,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:08,751 INFO L82 PathProgramCache]: Analyzing trace with hash 1102249098, now seen corresponding path program 10 times [2021-05-02 23:58:08,751 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:08,751 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2064923298] [2021-05-02 23:58:08,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:08,754 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:08,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:08,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:08,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:08,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:08,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:09,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-02 23:58:09,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:09,036 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:09,036 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:09,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2064923298] [2021-05-02 23:58:09,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2064923298] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:09,036 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:09,036 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-02 23:58:09,036 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141984953] [2021-05-02 23:58:09,036 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 23:58:09,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:09,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 23:58:09,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2021-05-02 23:58:09,037 INFO L87 Difference]: Start difference. First operand 86 states and 108 transitions. Second operand has 16 states, 16 states have (on average 2.9375) internal successors, (47), 14 states have internal predecessors, (47), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:09,856 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:58:10,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:10,838 INFO L93 Difference]: Finished difference Result 156 states and 198 transitions. [2021-05-02 23:58:10,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 23:58:10,839 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.9375) internal successors, (47), 14 states have internal predecessors, (47), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 66 [2021-05-02 23:58:10,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:10,840 INFO L225 Difference]: With dead ends: 156 [2021-05-02 23:58:10,840 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 23:58:10,841 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 1453.7ms TimeCoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:58:10,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 23:58:10,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-02 23:58:10,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 69 states have (on average 1.2463768115942029) internal successors, (86), 69 states have internal predecessors, (86), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:10,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 109 transitions. [2021-05-02 23:58:10,848 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 109 transitions. Word has length 66 [2021-05-02 23:58:10,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:10,849 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 109 transitions. [2021-05-02 23:58:10,849 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.9375) internal successors, (47), 14 states have internal predecessors, (47), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:10,849 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 109 transitions. [2021-05-02 23:58:10,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 23:58:10,849 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:10,849 INFO L523 BasicCegarLoop]: trace histogram [22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:10,850 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-02 23:58:10,850 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:10,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:10,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1393110240, now seen corresponding path program 11 times [2021-05-02 23:58:10,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:10,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [377306751] [2021-05-02 23:58:10,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:10,852 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:10,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:10,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:10,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:11,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:11,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:11,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-02 23:58:11,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:11,120 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:11,120 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:11,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [377306751] [2021-05-02 23:58:11,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [377306751] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:11,120 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:11,120 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-02 23:58:11,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213390752] [2021-05-02 23:58:11,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 23:58:11,121 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:11,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 23:58:11,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:58:11,122 INFO L87 Difference]: Start difference. First operand 87 states and 109 transitions. Second operand has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 15 states have internal predecessors, (48), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:13,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:13,062 INFO L93 Difference]: Finished difference Result 158 states and 200 transitions. [2021-05-02 23:58:13,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 23:58:13,062 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 15 states have internal predecessors, (48), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 68 [2021-05-02 23:58:13,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:13,063 INFO L225 Difference]: With dead ends: 158 [2021-05-02 23:58:13,063 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 23:58:13,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1594.1ms TimeCoverageRelationStatistics Valid=289, Invalid=641, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:58:13,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 23:58:13,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-05-02 23:58:13,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 70 states have (on average 1.2428571428571429) internal successors, (87), 70 states have internal predecessors, (87), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:13,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 110 transitions. [2021-05-02 23:58:13,072 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 110 transitions. Word has length 68 [2021-05-02 23:58:13,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:13,072 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 110 transitions. [2021-05-02 23:58:13,072 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 15 states have internal predecessors, (48), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:13,072 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 110 transitions. [2021-05-02 23:58:13,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 23:58:13,073 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:13,073 INFO L523 BasicCegarLoop]: trace histogram [24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:13,073 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-02 23:58:13,073 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:13,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:13,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1390454090, now seen corresponding path program 12 times [2021-05-02 23:58:13,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:13,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995171313] [2021-05-02 23:58:13,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:13,075 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:13,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:13,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:13,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:13,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:13,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:13,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-05-02 23:58:13,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:13,355 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:13,356 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:13,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [995171313] [2021-05-02 23:58:13,356 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [995171313] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:13,356 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:13,356 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-02 23:58:13,356 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395701096] [2021-05-02 23:58:13,357 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 23:58:13,357 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:13,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 23:58:13,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:58:13,357 INFO L87 Difference]: Start difference. First operand 88 states and 110 transitions. Second operand has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 16 states have internal predecessors, (49), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:14,309 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:58:15,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:15,254 INFO L93 Difference]: Finished difference Result 160 states and 202 transitions. [2021-05-02 23:58:15,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 23:58:15,255 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 16 states have internal predecessors, (49), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 70 [2021-05-02 23:58:15,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:15,256 INFO L225 Difference]: With dead ends: 160 [2021-05-02 23:58:15,256 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 23:58:15,257 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1722.6ms TimeCoverageRelationStatistics Valid=331, Invalid=725, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:58:15,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 23:58:15,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-05-02 23:58:15,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 71 states have (on average 1.2394366197183098) internal successors, (88), 71 states have internal predecessors, (88), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:15,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 111 transitions. [2021-05-02 23:58:15,264 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 111 transitions. Word has length 70 [2021-05-02 23:58:15,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:15,265 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 111 transitions. [2021-05-02 23:58:15,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 16 states have internal predecessors, (49), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:15,265 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 111 transitions. [2021-05-02 23:58:15,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-02 23:58:15,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:15,265 INFO L523 BasicCegarLoop]: trace histogram [26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:15,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-02 23:58:15,266 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:15,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:15,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1316589984, now seen corresponding path program 13 times [2021-05-02 23:58:15,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:15,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082223740] [2021-05-02 23:58:15,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:15,268 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:15,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:15,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:15,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:15,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:15,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:15,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-02 23:58:15,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:15,553 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:15,553 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:15,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082223740] [2021-05-02 23:58:15,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2082223740] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:15,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:15,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-02 23:58:15,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323003304] [2021-05-02 23:58:15,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 23:58:15,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:15,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 23:58:15,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:58:15,555 INFO L87 Difference]: Start difference. First operand 89 states and 111 transitions. Second operand has 19 states, 19 states have (on average 2.6315789473684212) internal successors, (50), 17 states have internal predecessors, (50), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:17,545 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-02 23:58:17,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:17,825 INFO L93 Difference]: Finished difference Result 162 states and 204 transitions. [2021-05-02 23:58:17,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 23:58:17,826 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.6315789473684212) internal successors, (50), 17 states have internal predecessors, (50), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 72 [2021-05-02 23:58:17,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:17,827 INFO L225 Difference]: With dead ends: 162 [2021-05-02 23:58:17,827 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 23:58:17,828 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1863.6ms TimeCoverageRelationStatistics Valid=376, Invalid=814, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:58:17,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 23:58:17,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-05-02 23:58:17,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 72 states have (on average 1.2361111111111112) internal successors, (89), 72 states have internal predecessors, (89), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:17,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 112 transitions. [2021-05-02 23:58:17,836 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 112 transitions. Word has length 72 [2021-05-02 23:58:17,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:17,836 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 112 transitions. [2021-05-02 23:58:17,836 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.6315789473684212) internal successors, (50), 17 states have internal predecessors, (50), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:17,837 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 112 transitions. [2021-05-02 23:58:17,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 23:58:17,837 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:17,837 INFO L523 BasicCegarLoop]: trace histogram [28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:17,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 23:58:17,837 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:17,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:17,838 INFO L82 PathProgramCache]: Analyzing trace with hash -286155254, now seen corresponding path program 14 times [2021-05-02 23:58:17,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:17,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434958250] [2021-05-02 23:58:17,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:17,840 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:17,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:17,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:17,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:17,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:17,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:18,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-02 23:58:18,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:18,177 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:18,178 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:18,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434958250] [2021-05-02 23:58:18,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1434958250] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:18,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:18,178 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-02 23:58:18,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40099360] [2021-05-02 23:58:18,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 23:58:18,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:18,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 23:58:18,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2021-05-02 23:58:18,181 INFO L87 Difference]: Start difference. First operand 90 states and 112 transitions. Second operand has 20 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:20,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:20,421 INFO L93 Difference]: Finished difference Result 164 states and 206 transitions. [2021-05-02 23:58:20,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 23:58:20,422 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 74 [2021-05-02 23:58:20,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:20,423 INFO L225 Difference]: With dead ends: 164 [2021-05-02 23:58:20,423 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 23:58:20,424 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 1970.9ms TimeCoverageRelationStatistics Valid=424, Invalid=908, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 23:58:20,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 23:58:20,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-05-02 23:58:20,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 73 states have (on average 1.2328767123287672) internal successors, (90), 73 states have internal predecessors, (90), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:20,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 113 transitions. [2021-05-02 23:58:20,432 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 113 transitions. Word has length 74 [2021-05-02 23:58:20,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:20,432 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 113 transitions. [2021-05-02 23:58:20,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:20,433 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 113 transitions. [2021-05-02 23:58:20,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 23:58:20,433 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:20,433 INFO L523 BasicCegarLoop]: trace histogram [30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:20,433 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-02 23:58:20,433 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:20,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:20,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1348028000, now seen corresponding path program 15 times [2021-05-02 23:58:20,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:20,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443136830] [2021-05-02 23:58:20,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:20,435 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:20,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:20,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:20,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:20,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:20,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:20,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-02 23:58:20,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:20,747 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:20,747 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:20,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443136830] [2021-05-02 23:58:20,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [443136830] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:20,748 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:20,748 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-02 23:58:20,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935033580] [2021-05-02 23:58:20,748 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 23:58:20,748 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:20,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 23:58:20,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:58:20,749 INFO L87 Difference]: Start difference. First operand 91 states and 113 transitions. Second operand has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 19 states have internal predecessors, (52), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:23,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:23,037 INFO L93 Difference]: Finished difference Result 166 states and 208 transitions. [2021-05-02 23:58:23,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 23:58:23,038 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 19 states have internal predecessors, (52), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 76 [2021-05-02 23:58:23,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:23,038 INFO L225 Difference]: With dead ends: 166 [2021-05-02 23:58:23,038 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 23:58:23,041 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 2112.1ms TimeCoverageRelationStatistics Valid=475, Invalid=1007, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 23:58:23,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 23:58:23,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-05-02 23:58:23,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 74 states have (on average 1.2297297297297298) internal successors, (91), 74 states have internal predecessors, (91), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:23,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 114 transitions. [2021-05-02 23:58:23,049 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 114 transitions. Word has length 76 [2021-05-02 23:58:23,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:23,049 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 114 transitions. [2021-05-02 23:58:23,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 19 states have internal predecessors, (52), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:23,049 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 114 transitions. [2021-05-02 23:58:23,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 23:58:23,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:23,050 INFO L523 BasicCegarLoop]: trace histogram [32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:23,050 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-02 23:58:23,050 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:23,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:23,050 INFO L82 PathProgramCache]: Analyzing trace with hash 286385866, now seen corresponding path program 16 times [2021-05-02 23:58:23,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:23,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1142230270] [2021-05-02 23:58:23,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:23,052 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:23,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:23,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:23,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:23,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:23,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:23,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-02 23:58:23,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:23,361 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:23,361 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:23,361 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1142230270] [2021-05-02 23:58:23,361 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1142230270] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:23,361 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:23,361 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-02 23:58:23,361 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740162673] [2021-05-02 23:58:23,361 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 23:58:23,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:23,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 23:58:23,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2021-05-02 23:58:23,362 INFO L87 Difference]: Start difference. First operand 92 states and 114 transitions. Second operand has 22 states, 22 states have (on average 2.409090909090909) internal successors, (53), 20 states have internal predecessors, (53), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:25,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:25,895 INFO L93 Difference]: Finished difference Result 168 states and 210 transitions. [2021-05-02 23:58:25,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 23:58:25,896 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.409090909090909) internal successors, (53), 20 states have internal predecessors, (53), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 78 [2021-05-02 23:58:25,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:25,897 INFO L225 Difference]: With dead ends: 168 [2021-05-02 23:58:25,897 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 23:58:25,898 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 2201.5ms TimeCoverageRelationStatistics Valid=529, Invalid=1111, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 23:58:25,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 23:58:25,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-02 23:58:25,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 75 states have (on average 1.2266666666666666) internal successors, (92), 75 states have internal predecessors, (92), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:25,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 115 transitions. [2021-05-02 23:58:25,906 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 115 transitions. Word has length 78 [2021-05-02 23:58:25,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:25,906 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 115 transitions. [2021-05-02 23:58:25,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.409090909090909) internal successors, (53), 20 states have internal predecessors, (53), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:25,906 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 115 transitions. [2021-05-02 23:58:25,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 23:58:25,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:25,907 INFO L523 BasicCegarLoop]: trace histogram [34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:25,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-02 23:58:25,907 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:25,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:25,907 INFO L82 PathProgramCache]: Analyzing trace with hash -55855904, now seen corresponding path program 17 times [2021-05-02 23:58:25,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:25,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641807144] [2021-05-02 23:58:25,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:25,909 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:25,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:26,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:26,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:26,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:26,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:26,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-02 23:58:26,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:26,261 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:26,261 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:26,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641807144] [2021-05-02 23:58:26,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1641807144] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:26,261 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:26,261 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-02 23:58:26,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519386830] [2021-05-02 23:58:26,263 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 23:58:26,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:26,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 23:58:26,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2021-05-02 23:58:26,263 INFO L87 Difference]: Start difference. First operand 93 states and 115 transitions. Second operand has 23 states, 23 states have (on average 2.347826086956522) internal successors, (54), 21 states have internal predecessors, (54), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:26,601 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:58:28,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:28,751 INFO L93 Difference]: Finished difference Result 170 states and 212 transitions. [2021-05-02 23:58:28,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 23:58:28,751 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.347826086956522) internal successors, (54), 21 states have internal predecessors, (54), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 80 [2021-05-02 23:58:28,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:28,752 INFO L225 Difference]: With dead ends: 170 [2021-05-02 23:58:28,752 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 23:58:28,753 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 2398.8ms TimeCoverageRelationStatistics Valid=586, Invalid=1220, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 23:58:28,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 23:58:28,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-05-02 23:58:28,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 76 states have (on average 1.2236842105263157) internal successors, (93), 76 states have internal predecessors, (93), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:28,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 116 transitions. [2021-05-02 23:58:28,762 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 116 transitions. Word has length 80 [2021-05-02 23:58:28,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:28,762 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 116 transitions. [2021-05-02 23:58:28,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.347826086956522) internal successors, (54), 21 states have internal predecessors, (54), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:28,763 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 116 transitions. [2021-05-02 23:58:28,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 23:58:28,763 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:28,763 INFO L523 BasicCegarLoop]: trace histogram [36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:28,763 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-02 23:58:28,763 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:28,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:28,764 INFO L82 PathProgramCache]: Analyzing trace with hash 963477386, now seen corresponding path program 18 times [2021-05-02 23:58:28,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:28,764 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573982460] [2021-05-02 23:58:28,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:28,765 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:28,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:28,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:28,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:28,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:28,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:29,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-02 23:58:29,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:29,155 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:29,156 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:29,156 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573982460] [2021-05-02 23:58:29,156 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1573982460] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:29,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:29,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-02 23:58:29,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673124906] [2021-05-02 23:58:29,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 23:58:29,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:29,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 23:58:29,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2021-05-02 23:58:29,157 INFO L87 Difference]: Start difference. First operand 94 states and 116 transitions. Second operand has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 22 states have internal predecessors, (55), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:31,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:31,723 INFO L93 Difference]: Finished difference Result 172 states and 214 transitions. [2021-05-02 23:58:31,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 23:58:31,724 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 22 states have internal predecessors, (55), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 82 [2021-05-02 23:58:31,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:31,725 INFO L225 Difference]: With dead ends: 172 [2021-05-02 23:58:31,725 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 23:58:31,726 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 2501.4ms TimeCoverageRelationStatistics Valid=646, Invalid=1334, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 23:58:31,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 23:58:31,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-05-02 23:58:31,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 77 states have (on average 1.2207792207792207) internal successors, (94), 77 states have internal predecessors, (94), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:31,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 117 transitions. [2021-05-02 23:58:31,734 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 117 transitions. Word has length 82 [2021-05-02 23:58:31,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:31,734 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 117 transitions. [2021-05-02 23:58:31,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 22 states have internal predecessors, (55), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:31,734 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 117 transitions. [2021-05-02 23:58:31,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-05-02 23:58:31,734 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:31,734 INFO L523 BasicCegarLoop]: trace histogram [38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:31,735 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-02 23:58:31,735 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:31,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:31,735 INFO L82 PathProgramCache]: Analyzing trace with hash -1997971424, now seen corresponding path program 19 times [2021-05-02 23:58:31,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:31,735 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1396064697] [2021-05-02 23:58:31,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:31,737 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:31,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:31,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:31,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:31,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:31,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:32,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-02 23:58:32,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:32,093 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:32,093 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:32,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1396064697] [2021-05-02 23:58:32,093 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1396064697] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:32,093 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:32,093 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-02 23:58:32,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184826323] [2021-05-02 23:58:32,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 23:58:32,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:32,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 23:58:32,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:58:32,094 INFO L87 Difference]: Start difference. First operand 95 states and 117 transitions. Second operand has 25 states, 25 states have (on average 2.24) internal successors, (56), 23 states have internal predecessors, (56), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:35,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:35,264 INFO L93 Difference]: Finished difference Result 174 states and 216 transitions. [2021-05-02 23:58:35,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 23:58:35,264 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 23 states have internal predecessors, (56), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 84 [2021-05-02 23:58:35,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:35,265 INFO L225 Difference]: With dead ends: 174 [2021-05-02 23:58:35,265 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 23:58:35,266 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 2649.7ms TimeCoverageRelationStatistics Valid=709, Invalid=1453, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 23:58:35,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 23:58:35,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-05-02 23:58:35,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 78 states have (on average 1.2179487179487178) internal successors, (95), 78 states have internal predecessors, (95), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:35,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 118 transitions. [2021-05-02 23:58:35,275 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 118 transitions. Word has length 84 [2021-05-02 23:58:35,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:35,275 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 118 transitions. [2021-05-02 23:58:35,275 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 23 states have internal predecessors, (56), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:35,275 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 118 transitions. [2021-05-02 23:58:35,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 23:58:35,276 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:35,276 INFO L523 BasicCegarLoop]: trace histogram [40, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:35,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-02 23:58:35,276 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:35,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:35,276 INFO L82 PathProgramCache]: Analyzing trace with hash 758147146, now seen corresponding path program 20 times [2021-05-02 23:58:35,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:35,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448944442] [2021-05-02 23:58:35,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:35,278 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:35,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:35,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:35,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:35,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:35,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:35,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-05-02 23:58:35,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:35,705 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:35,705 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:35,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448944442] [2021-05-02 23:58:35,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [448944442] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:35,705 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:35,705 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-02 23:58:35,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437323518] [2021-05-02 23:58:35,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 23:58:35,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:35,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 23:58:35,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2021-05-02 23:58:35,707 INFO L87 Difference]: Start difference. First operand 96 states and 118 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 24 states have internal predecessors, (57), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:38,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:38,645 INFO L93 Difference]: Finished difference Result 176 states and 218 transitions. [2021-05-02 23:58:38,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 23:58:38,645 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 24 states have internal predecessors, (57), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 86 [2021-05-02 23:58:38,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:38,646 INFO L225 Difference]: With dead ends: 176 [2021-05-02 23:58:38,646 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 23:58:38,647 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 2856.5ms TimeCoverageRelationStatistics Valid=775, Invalid=1577, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 23:58:38,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 23:58:38,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-05-02 23:58:38,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:38,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 119 transitions. [2021-05-02 23:58:38,658 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 119 transitions. Word has length 86 [2021-05-02 23:58:38,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:38,658 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 119 transitions. [2021-05-02 23:58:38,658 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 24 states have internal predecessors, (57), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:38,658 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 119 transitions. [2021-05-02 23:58:38,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-02 23:58:38,659 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:38,659 INFO L523 BasicCegarLoop]: trace histogram [42, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:38,659 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-02 23:58:38,659 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:38,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:38,659 INFO L82 PathProgramCache]: Analyzing trace with hash 531872608, now seen corresponding path program 21 times [2021-05-02 23:58:38,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:38,660 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643195704] [2021-05-02 23:58:38,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:38,662 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:38,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:38,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:38,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:38,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:38,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:39,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-02 23:58:39,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:39,121 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:39,121 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:39,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643195704] [2021-05-02 23:58:39,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [643195704] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:39,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:39,122 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-02 23:58:39,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991989790] [2021-05-02 23:58:39,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 23:58:39,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:39,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 23:58:39,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:58:39,123 INFO L87 Difference]: Start difference. First operand 97 states and 119 transitions. Second operand has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 25 states have internal predecessors, (58), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:43,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:43,166 INFO L93 Difference]: Finished difference Result 178 states and 220 transitions. [2021-05-02 23:58:43,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 23:58:43,167 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 25 states have internal predecessors, (58), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 88 [2021-05-02 23:58:43,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:43,173 INFO L225 Difference]: With dead ends: 178 [2021-05-02 23:58:43,173 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 23:58:43,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 3001.8ms TimeCoverageRelationStatistics Valid=844, Invalid=1706, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 23:58:43,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 23:58:43,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-05-02 23:58:43,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 80 states have (on average 1.2125) internal successors, (97), 80 states have internal predecessors, (97), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:43,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 120 transitions. [2021-05-02 23:58:43,185 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 120 transitions. Word has length 88 [2021-05-02 23:58:43,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:43,185 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 120 transitions. [2021-05-02 23:58:43,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 25 states have internal predecessors, (58), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:43,185 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 120 transitions. [2021-05-02 23:58:43,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-05-02 23:58:43,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:43,186 INFO L523 BasicCegarLoop]: trace histogram [44, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:43,186 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-02 23:58:43,186 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:43,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:43,186 INFO L82 PathProgramCache]: Analyzing trace with hash -1232690934, now seen corresponding path program 22 times [2021-05-02 23:58:43,186 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:43,186 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202458411] [2021-05-02 23:58:43,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:43,188 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:43,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:43,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:43,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:43,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:43,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:43,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-02 23:58:43,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:43,737 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:43,737 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:43,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202458411] [2021-05-02 23:58:43,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [202458411] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:43,738 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:43,738 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-02 23:58:43,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504961886] [2021-05-02 23:58:43,738 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 23:58:43,738 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:43,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 23:58:43,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2021-05-02 23:58:43,739 INFO L87 Difference]: Start difference. First operand 98 states and 120 transitions. Second operand has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:47,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:47,583 INFO L93 Difference]: Finished difference Result 180 states and 222 transitions. [2021-05-02 23:58:47,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 23:58:47,583 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 90 [2021-05-02 23:58:47,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:47,584 INFO L225 Difference]: With dead ends: 180 [2021-05-02 23:58:47,584 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 23:58:47,586 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 3193.2ms TimeCoverageRelationStatistics Valid=916, Invalid=1840, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 23:58:47,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 23:58:47,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-02 23:58:47,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 81 states have (on average 1.2098765432098766) internal successors, (98), 81 states have internal predecessors, (98), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:47,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 121 transitions. [2021-05-02 23:58:47,595 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 121 transitions. Word has length 90 [2021-05-02 23:58:47,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:47,595 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 121 transitions. [2021-05-02 23:58:47,595 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:47,595 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 121 transitions. [2021-05-02 23:58:47,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 23:58:47,595 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:47,596 INFO L523 BasicCegarLoop]: trace histogram [46, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:47,596 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-02 23:58:47,596 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:47,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:47,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1486960992, now seen corresponding path program 23 times [2021-05-02 23:58:47,596 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:47,596 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [609888798] [2021-05-02 23:58:47,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:47,598 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:47,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:47,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:47,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:47,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:47,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:48,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-05-02 23:58:48,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:48,068 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:48,068 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:48,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [609888798] [2021-05-02 23:58:48,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [609888798] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:48,068 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:48,068 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-02 23:58:48,068 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939356949] [2021-05-02 23:58:48,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 23:58:48,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:48,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 23:58:48,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:58:48,070 INFO L87 Difference]: Start difference. First operand 99 states and 121 transitions. Second operand has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 27 states have internal predecessors, (60), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:51,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:51,653 INFO L93 Difference]: Finished difference Result 182 states and 224 transitions. [2021-05-02 23:58:51,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 23:58:51,654 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 27 states have internal predecessors, (60), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 92 [2021-05-02 23:58:51,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:51,655 INFO L225 Difference]: With dead ends: 182 [2021-05-02 23:58:51,655 INFO L226 Difference]: Without dead ends: 100 [2021-05-02 23:58:51,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 3315.1ms TimeCoverageRelationStatistics Valid=991, Invalid=1979, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 23:58:51,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-02 23:58:51,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-05-02 23:58:51,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 82 states have (on average 1.2073170731707317) internal successors, (99), 82 states have internal predecessors, (99), 13 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:51,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 122 transitions. [2021-05-02 23:58:51,665 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 122 transitions. Word has length 92 [2021-05-02 23:58:51,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:51,665 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 122 transitions. [2021-05-02 23:58:51,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 27 states have internal predecessors, (60), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:58:51,665 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 122 transitions. [2021-05-02 23:58:51,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-02 23:58:51,666 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:51,666 INFO L523 BasicCegarLoop]: trace histogram [48, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:51,666 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-02 23:58:51,666 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:51,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:51,667 INFO L82 PathProgramCache]: Analyzing trace with hash 1687955914, now seen corresponding path program 24 times [2021-05-02 23:58:51,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:51,667 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1922237295] [2021-05-02 23:58:51,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:51,669 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:51,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:51,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:51,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:51,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:51,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:51,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 23:58:51,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:52,244 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 23:58:52,244 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:58:52,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1922237295] [2021-05-02 23:58:52,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1922237295] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:58:52,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:58:52,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-02 23:58:52,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500853415] [2021-05-02 23:58:52,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 23:58:52,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:58:52,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 23:58:52,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2021-05-02 23:58:52,247 INFO L87 Difference]: Start difference. First operand 100 states and 122 transitions. Second operand has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 28 states have internal predecessors, (61), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:58:55,005 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:58:59,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:58:59,498 INFO L93 Difference]: Finished difference Result 184 states and 218 transitions. [2021-05-02 23:58:59,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 23:58:59,499 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 28 states have internal predecessors, (61), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 94 [2021-05-02 23:58:59,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:58:59,499 INFO L225 Difference]: With dead ends: 184 [2021-05-02 23:58:59,500 INFO L226 Difference]: Without dead ends: 129 [2021-05-02 23:58:59,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1346 ImplicationChecksByTransitivity, 6731.0ms TimeCoverageRelationStatistics Valid=2122, Invalid=4520, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 23:58:59,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-02 23:58:59,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-05-02 23:58:59,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 110 states have (on average 1.1727272727272726) internal successors, (129), 110 states have internal predecessors, (129), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:58:59,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 152 transitions. [2021-05-02 23:58:59,516 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 152 transitions. Word has length 94 [2021-05-02 23:58:59,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:58:59,517 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 152 transitions. [2021-05-02 23:58:59,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 28 states have internal predecessors, (61), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:58:59,517 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 152 transitions. [2021-05-02 23:58:59,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 23:58:59,518 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:58:59,518 INFO L523 BasicCegarLoop]: trace histogram [49, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:58:59,518 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-02 23:58:59,518 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:58:59,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:58:59,518 INFO L82 PathProgramCache]: Analyzing trace with hash 207333048, now seen corresponding path program 25 times [2021-05-02 23:58:59,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:58:59,518 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109957674] [2021-05-02 23:58:59,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:58:59,520 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:58:59,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:59,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:58:59,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:59,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:58:59,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:58:59,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 23:58:59,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:00,055 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:59:00,055 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:59:00,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1109957674] [2021-05-02 23:59:00,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1109957674] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:59:00,056 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:59:00,056 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-02 23:59:00,056 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980776909] [2021-05-02 23:59:00,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 23:59:00,056 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:59:00,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 23:59:00,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:59:00,057 INFO L87 Difference]: Start difference. First operand 129 states and 152 transitions. Second operand has 31 states, 31 states have (on average 2.0) internal successors, (62), 29 states have internal predecessors, (62), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:03,127 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:59:03,258 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:59:03,398 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:59:03,533 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:59:08,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:59:08,653 INFO L93 Difference]: Finished difference Result 193 states and 228 transitions. [2021-05-02 23:59:08,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 23:59:08,654 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 29 states have internal predecessors, (62), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 95 [2021-05-02 23:59:08,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:59:08,655 INFO L225 Difference]: With dead ends: 193 [2021-05-02 23:59:08,655 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 23:59:08,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1452 ImplicationChecksByTransitivity, 7009.1ms TimeCoverageRelationStatistics Valid=2284, Invalid=4856, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 23:59:08,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 23:59:08,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 130. [2021-05-02 23:59:08,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 111 states have (on average 1.1711711711711712) internal successors, (130), 111 states have internal predecessors, (130), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:59:08,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 153 transitions. [2021-05-02 23:59:08,671 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 153 transitions. Word has length 95 [2021-05-02 23:59:08,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:59:08,672 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 153 transitions. [2021-05-02 23:59:08,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 29 states have internal predecessors, (62), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:08,672 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 153 transitions. [2021-05-02 23:59:08,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-05-02 23:59:08,672 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:59:08,673 INFO L523 BasicCegarLoop]: trace histogram [50, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:59:08,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-02 23:59:08,673 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:59:08,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:59:08,673 INFO L82 PathProgramCache]: Analyzing trace with hash 1552664458, now seen corresponding path program 26 times [2021-05-02 23:59:08,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:59:08,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754429091] [2021-05-02 23:59:08,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:59:08,675 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:59:08,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:08,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:59:08,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:08,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:59:08,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:08,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 23:59:08,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:09,242 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:59:09,242 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:59:09,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1754429091] [2021-05-02 23:59:09,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1754429091] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:59:09,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:59:09,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-02 23:59:09,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355763310] [2021-05-02 23:59:09,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 23:59:09,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:59:09,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 23:59:09,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2021-05-02 23:59:09,245 INFO L87 Difference]: Start difference. First operand 130 states and 153 transitions. Second operand has 32 states, 32 states have (on average 1.96875) internal successors, (63), 30 states have internal predecessors, (63), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:15,269 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:59:17,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:59:17,670 INFO L93 Difference]: Finished difference Result 198 states and 234 transitions. [2021-05-02 23:59:17,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-02 23:59:17,671 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 30 states have internal predecessors, (63), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 96 [2021-05-02 23:59:17,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:59:17,672 INFO L225 Difference]: With dead ends: 198 [2021-05-02 23:59:17,672 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 23:59:17,673 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1562 ImplicationChecksByTransitivity, 7300.9ms TimeCoverageRelationStatistics Valid=2452, Invalid=5204, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 23:59:17,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 23:59:17,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 131. [2021-05-02 23:59:17,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 112 states have (on average 1.1696428571428572) internal successors, (131), 112 states have internal predecessors, (131), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:59:17,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 154 transitions. [2021-05-02 23:59:17,687 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 154 transitions. Word has length 96 [2021-05-02 23:59:17,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:59:17,688 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 154 transitions. [2021-05-02 23:59:17,688 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 30 states have internal predecessors, (63), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:17,688 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 154 transitions. [2021-05-02 23:59:17,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 23:59:17,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:59:17,688 INFO L523 BasicCegarLoop]: trace histogram [51, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:59:17,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-02 23:59:17,689 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:59:17,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:59:17,689 INFO L82 PathProgramCache]: Analyzing trace with hash 308265208, now seen corresponding path program 27 times [2021-05-02 23:59:17,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:59:17,689 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111696909] [2021-05-02 23:59:17,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:59:17,691 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:59:17,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:17,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:59:17,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:17,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:59:17,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:17,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 23:59:17,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:18,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:59:18,262 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:59:18,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111696909] [2021-05-02 23:59:18,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [111696909] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:59:18,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:59:18,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-02 23:59:18,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048573921] [2021-05-02 23:59:18,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 23:59:18,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:59:18,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 23:59:18,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:59:18,263 INFO L87 Difference]: Start difference. First operand 131 states and 154 transitions. Second operand has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:27,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:59:27,733 INFO L93 Difference]: Finished difference Result 203 states and 240 transitions. [2021-05-02 23:59:27,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 23:59:27,733 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 97 [2021-05-02 23:59:27,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:59:27,734 INFO L225 Difference]: With dead ends: 203 [2021-05-02 23:59:27,734 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 23:59:27,735 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1676 ImplicationChecksByTransitivity, 7476.4ms TimeCoverageRelationStatistics Valid=2626, Invalid=5564, Unknown=0, NotChecked=0, Total=8190 [2021-05-02 23:59:27,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 23:59:27,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 132. [2021-05-02 23:59:27,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 113 states have (on average 1.168141592920354) internal successors, (132), 113 states have internal predecessors, (132), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:59:27,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 155 transitions. [2021-05-02 23:59:27,750 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 155 transitions. Word has length 97 [2021-05-02 23:59:27,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:59:27,750 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 155 transitions. [2021-05-02 23:59:27,750 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:27,750 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 155 transitions. [2021-05-02 23:59:27,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-02 23:59:27,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:59:27,751 INFO L523 BasicCegarLoop]: trace histogram [52, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:59:27,751 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-02 23:59:27,751 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:59:27,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:59:27,751 INFO L82 PathProgramCache]: Analyzing trace with hash 386594122, now seen corresponding path program 28 times [2021-05-02 23:59:27,751 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:59:27,751 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1351946632] [2021-05-02 23:59:27,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:59:27,753 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:59:27,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:27,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:59:27,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:27,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:59:27,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:27,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 23:59:27,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:28,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:59:28,401 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:59:28,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1351946632] [2021-05-02 23:59:28,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1351946632] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:59:28,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:59:28,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-02 23:59:28,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682315346] [2021-05-02 23:59:28,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 23:59:28,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:59:28,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 23:59:28,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 23:59:28,403 INFO L87 Difference]: Start difference. First operand 132 states and 155 transitions. Second operand has 34 states, 34 states have (on average 1.911764705882353) internal successors, (65), 32 states have internal predecessors, (65), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:32,039 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:59:32,182 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:59:38,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:59:38,380 INFO L93 Difference]: Finished difference Result 208 states and 246 transitions. [2021-05-02 23:59:38,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 23:59:38,380 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.911764705882353) internal successors, (65), 32 states have internal predecessors, (65), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 98 [2021-05-02 23:59:38,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:59:38,381 INFO L225 Difference]: With dead ends: 208 [2021-05-02 23:59:38,381 INFO L226 Difference]: Without dead ends: 145 [2021-05-02 23:59:38,383 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1794 ImplicationChecksByTransitivity, 7934.9ms TimeCoverageRelationStatistics Valid=2806, Invalid=5936, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 23:59:38,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-05-02 23:59:38,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 133. [2021-05-02 23:59:38,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 114 states have (on average 1.1666666666666667) internal successors, (133), 114 states have internal predecessors, (133), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:59:38,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 156 transitions. [2021-05-02 23:59:38,401 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 156 transitions. Word has length 98 [2021-05-02 23:59:38,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:59:38,401 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 156 transitions. [2021-05-02 23:59:38,401 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.911764705882353) internal successors, (65), 32 states have internal predecessors, (65), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:38,401 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 156 transitions. [2021-05-02 23:59:38,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 23:59:38,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:59:38,402 INFO L523 BasicCegarLoop]: trace histogram [53, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:59:38,402 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-02 23:59:38,402 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:59:38,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:59:38,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1480176840, now seen corresponding path program 29 times [2021-05-02 23:59:38,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:59:38,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1071336268] [2021-05-02 23:59:38,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:59:38,406 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:59:38,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:38,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:59:38,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:38,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:59:38,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:38,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 23:59:38,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:39,028 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:59:39,029 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:59:39,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1071336268] [2021-05-02 23:59:39,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1071336268] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:59:39,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:59:39,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-02 23:59:39,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786274685] [2021-05-02 23:59:39,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 23:59:39,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:59:39,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 23:59:39,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:59:39,030 INFO L87 Difference]: Start difference. First operand 133 states and 156 transitions. Second operand has 35 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 33 states have internal predecessors, (66), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:50,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:59:50,115 INFO L93 Difference]: Finished difference Result 213 states and 252 transitions. [2021-05-02 23:59:50,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 23:59:50,116 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 33 states have internal predecessors, (66), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 99 [2021-05-02 23:59:50,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:59:50,117 INFO L225 Difference]: With dead ends: 213 [2021-05-02 23:59:50,117 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 23:59:50,117 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1916 ImplicationChecksByTransitivity, 8349.4ms TimeCoverageRelationStatistics Valid=2992, Invalid=6320, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 23:59:50,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 23:59:50,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 134. [2021-05-02 23:59:50,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 115 states have (on average 1.1652173913043478) internal successors, (134), 115 states have internal predecessors, (134), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:59:50,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 157 transitions. [2021-05-02 23:59:50,133 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 157 transitions. Word has length 99 [2021-05-02 23:59:50,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:59:50,133 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 157 transitions. [2021-05-02 23:59:50,133 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 33 states have internal predecessors, (66), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:50,133 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 157 transitions. [2021-05-02 23:59:50,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-02 23:59:50,134 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:59:50,134 INFO L523 BasicCegarLoop]: trace histogram [54, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:59:50,134 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-02 23:59:50,134 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:59:50,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:59:50,134 INFO L82 PathProgramCache]: Analyzing trace with hash 779465482, now seen corresponding path program 30 times [2021-05-02 23:59:50,134 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:59:50,134 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703313810] [2021-05-02 23:59:50,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:59:50,136 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:59:50,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:50,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:59:50,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:50,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:59:50,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:50,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 23:59:50,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:50,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:59:50,795 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:59:50,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703313810] [2021-05-02 23:59:50,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [703313810] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:59:50,795 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:59:50,795 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-02 23:59:50,795 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508624389] [2021-05-02 23:59:50,795 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 23:59:50,795 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:59:50,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 23:59:50,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 23:59:50,796 INFO L87 Difference]: Start difference. First operand 134 states and 157 transitions. Second operand has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 34 states have internal predecessors, (67), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:58,358 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:59:59,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:59:59,788 INFO L93 Difference]: Finished difference Result 218 states and 258 transitions. [2021-05-02 23:59:59,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-02 23:59:59,789 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 34 states have internal predecessors, (67), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 100 [2021-05-02 23:59:59,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:59:59,789 INFO L225 Difference]: With dead ends: 218 [2021-05-02 23:59:59,789 INFO L226 Difference]: Without dead ends: 153 [2021-05-02 23:59:59,791 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2042 ImplicationChecksByTransitivity, 8674.0ms TimeCoverageRelationStatistics Valid=3184, Invalid=6716, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 23:59:59,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-05-02 23:59:59,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 135. [2021-05-02 23:59:59,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 116 states have (on average 1.1637931034482758) internal successors, (135), 116 states have internal predecessors, (135), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 23:59:59,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 158 transitions. [2021-05-02 23:59:59,806 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 158 transitions. Word has length 100 [2021-05-02 23:59:59,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:59:59,806 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 158 transitions. [2021-05-02 23:59:59,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 34 states have internal predecessors, (67), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 23:59:59,806 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 158 transitions. [2021-05-02 23:59:59,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 23:59:59,807 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:59:59,807 INFO L523 BasicCegarLoop]: trace histogram [55, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:59:59,807 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-02 23:59:59,807 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:59:59,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:59:59,807 INFO L82 PathProgramCache]: Analyzing trace with hash 2108900728, now seen corresponding path program 31 times [2021-05-02 23:59:59,808 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:59:59,808 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357122482] [2021-05-02 23:59:59,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:59:59,809 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:59:59,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:59,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:59:59,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:59,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 23:59:59,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:59:59,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 23:59:59,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:00,478 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:00:00,478 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:00:00,478 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357122482] [2021-05-03 00:00:00,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1357122482] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:00:00,479 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:00:00,479 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-03 00:00:00,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095011797] [2021-05-03 00:00:00,479 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-03 00:00:00,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:00:00,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-03 00:00:00,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2021-05-03 00:00:00,480 INFO L87 Difference]: Start difference. First operand 135 states and 158 transitions. Second operand has 37 states, 37 states have (on average 1.837837837837838) internal successors, (68), 35 states have internal predecessors, (68), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:00:05,563 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:07,196 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:10,012 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:00:10,158 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:00:13,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:00:13,203 INFO L93 Difference]: Finished difference Result 223 states and 264 transitions. [2021-05-03 00:00:13,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-03 00:00:13,204 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.837837837837838) internal successors, (68), 35 states have internal predecessors, (68), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 101 [2021-05-03 00:00:13,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:00:13,205 INFO L225 Difference]: With dead ends: 223 [2021-05-03 00:00:13,205 INFO L226 Difference]: Without dead ends: 157 [2021-05-03 00:00:13,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2172 ImplicationChecksByTransitivity, 9275.5ms TimeCoverageRelationStatistics Valid=3382, Invalid=7124, Unknown=0, NotChecked=0, Total=10506 [2021-05-03 00:00:13,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-03 00:00:13,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 136. [2021-05-03 00:00:13,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 117 states have (on average 1.1623931623931625) internal successors, (136), 117 states have internal predecessors, (136), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:00:13,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 159 transitions. [2021-05-03 00:00:13,241 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 159 transitions. Word has length 101 [2021-05-03 00:00:13,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:00:13,241 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 159 transitions. [2021-05-03 00:00:13,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.837837837837838) internal successors, (68), 35 states have internal predecessors, (68), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:00:13,241 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 159 transitions. [2021-05-03 00:00:13,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-03 00:00:13,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:00:13,242 INFO L523 BasicCegarLoop]: trace histogram [56, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:00:13,242 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-03 00:00:13,242 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:00:13,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:00:13,243 INFO L82 PathProgramCache]: Analyzing trace with hash 371720394, now seen corresponding path program 32 times [2021-05-03 00:00:13,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:00:13,243 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103739612] [2021-05-03 00:00:13,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:00:13,245 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:00:13,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:13,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:00:13,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:13,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:00:13,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:13,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:00:13,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:14,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:00:14,048 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:00:14,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103739612] [2021-05-03 00:00:14,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [103739612] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:00:14,049 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:00:14,049 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-03 00:00:14,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823848921] [2021-05-03 00:00:14,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-03 00:00:14,049 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:00:14,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-03 00:00:14,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2021-05-03 00:00:14,050 INFO L87 Difference]: Start difference. First operand 136 states and 159 transitions. Second operand has 38 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 36 states have internal predecessors, (69), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:00:19,085 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:00:19,420 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:19,549 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:19,669 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:19,790 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:20,031 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:21,158 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:21,576 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:21,872 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:22,328 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:22,503 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:22,699 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:23,029 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:23,370 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:23,549 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:00:23,875 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:24,101 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:00:24,225 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:00:24,843 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:00:25,120 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:00:25,833 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:00:28,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:00:28,866 INFO L93 Difference]: Finished difference Result 228 states and 270 transitions. [2021-05-03 00:00:28,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-03 00:00:28,866 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 36 states have internal predecessors, (69), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 102 [2021-05-03 00:00:28,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:00:28,868 INFO L225 Difference]: With dead ends: 228 [2021-05-03 00:00:28,868 INFO L226 Difference]: Without dead ends: 161 [2021-05-03 00:00:28,869 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2306 ImplicationChecksByTransitivity, 10111.7ms TimeCoverageRelationStatistics Valid=3586, Invalid=7544, Unknown=0, NotChecked=0, Total=11130 [2021-05-03 00:00:28,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-03 00:00:28,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 137. [2021-05-03 00:00:28,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 118 states have (on average 1.1610169491525424) internal successors, (137), 118 states have internal predecessors, (137), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:00:28,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 160 transitions. [2021-05-03 00:00:28,888 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 160 transitions. Word has length 102 [2021-05-03 00:00:28,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:00:28,890 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 160 transitions. [2021-05-03 00:00:28,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 36 states have internal predecessors, (69), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:00:28,890 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 160 transitions. [2021-05-03 00:00:28,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-03 00:00:28,891 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:00:28,891 INFO L523 BasicCegarLoop]: trace histogram [57, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:00:28,891 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-03 00:00:28,891 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:00:28,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:00:28,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1941262408, now seen corresponding path program 33 times [2021-05-03 00:00:28,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:00:28,891 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019140260] [2021-05-03 00:00:28,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:00:28,893 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:00:28,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:29,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:00:29,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:29,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:00:29,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:29,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:00:29,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:29,666 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:00:29,666 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:00:29,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019140260] [2021-05-03 00:00:29,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2019140260] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:00:29,666 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:00:29,666 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-03 00:00:29,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696201884] [2021-05-03 00:00:29,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-03 00:00:29,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:00:29,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-03 00:00:29,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2021-05-03 00:00:29,668 INFO L87 Difference]: Start difference. First operand 137 states and 160 transitions. Second operand has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 37 states have internal predecessors, (70), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:00:34,268 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:00:36,425 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:36,710 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:37,451 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:43,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:00:43,926 INFO L93 Difference]: Finished difference Result 233 states and 276 transitions. [2021-05-03 00:00:43,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-03 00:00:43,927 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 37 states have internal predecessors, (70), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 103 [2021-05-03 00:00:43,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:00:43,929 INFO L225 Difference]: With dead ends: 233 [2021-05-03 00:00:43,929 INFO L226 Difference]: Without dead ends: 165 [2021-05-03 00:00:43,939 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2444 ImplicationChecksByTransitivity, 9976.1ms TimeCoverageRelationStatistics Valid=3796, Invalid=7976, Unknown=0, NotChecked=0, Total=11772 [2021-05-03 00:00:43,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-05-03 00:00:43,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 138. [2021-05-03 00:00:43,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 119 states have (on average 1.1596638655462186) internal successors, (138), 119 states have internal predecessors, (138), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:00:43,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 161 transitions. [2021-05-03 00:00:43,963 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 161 transitions. Word has length 103 [2021-05-03 00:00:43,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:00:43,964 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 161 transitions. [2021-05-03 00:00:43,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 37 states have internal predecessors, (70), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:00:43,964 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 161 transitions. [2021-05-03 00:00:43,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-03 00:00:43,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:00:43,964 INFO L523 BasicCegarLoop]: trace histogram [58, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:00:43,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-03 00:00:43,964 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:00:43,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:00:43,965 INFO L82 PathProgramCache]: Analyzing trace with hash -629285238, now seen corresponding path program 34 times [2021-05-03 00:00:43,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:00:43,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559771301] [2021-05-03 00:00:43,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:00:43,967 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:00:43,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:44,140 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:00:44,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:00:44,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:44,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:00:44,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:44,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:00:44,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:44,796 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:00:44,796 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:00:44,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559771301] [2021-05-03 00:00:44,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [559771301] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:00:44,796 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:00:44,797 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-03 00:00:44,797 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612198238] [2021-05-03 00:00:44,797 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-03 00:00:44,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:00:44,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-03 00:00:44,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2021-05-03 00:00:44,798 INFO L87 Difference]: Start difference. First operand 138 states and 161 transitions. Second operand has 40 states, 40 states have (on average 1.775) internal successors, (71), 38 states have internal predecessors, (71), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:00:47,756 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:00:49,883 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:51,029 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:51,207 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:51,533 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:00:57,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:00:57,710 INFO L93 Difference]: Finished difference Result 238 states and 282 transitions. [2021-05-03 00:00:57,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-03 00:00:57,711 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.775) internal successors, (71), 38 states have internal predecessors, (71), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 104 [2021-05-03 00:00:57,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:00:57,712 INFO L225 Difference]: With dead ends: 238 [2021-05-03 00:00:57,712 INFO L226 Difference]: Without dead ends: 169 [2021-05-03 00:00:57,713 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2586 ImplicationChecksByTransitivity, 10404.1ms TimeCoverageRelationStatistics Valid=4012, Invalid=8420, Unknown=0, NotChecked=0, Total=12432 [2021-05-03 00:00:57,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-03 00:00:57,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 139. [2021-05-03 00:00:57,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 120 states have (on average 1.1583333333333334) internal successors, (139), 120 states have internal predecessors, (139), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:00:57,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 162 transitions. [2021-05-03 00:00:57,732 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 162 transitions. Word has length 104 [2021-05-03 00:00:57,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:00:57,732 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 162 transitions. [2021-05-03 00:00:57,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.775) internal successors, (71), 38 states have internal predecessors, (71), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:00:57,733 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 162 transitions. [2021-05-03 00:00:57,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-03 00:00:57,733 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:00:57,733 INFO L523 BasicCegarLoop]: trace histogram [59, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:00:57,733 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-03 00:00:57,733 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:00:57,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:00:57,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1387301368, now seen corresponding path program 35 times [2021-05-03 00:00:57,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:00:57,734 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [229961213] [2021-05-03 00:00:57,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:00:57,735 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:00:57,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:57,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:00:57,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:57,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:00:57,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:57,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:00:57,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:00:58,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:00:58,583 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:00:58,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [229961213] [2021-05-03 00:00:58,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [229961213] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:00:58,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:00:58,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-03 00:00:58,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960407251] [2021-05-03 00:00:58,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-03 00:00:58,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:00:58,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-03 00:00:58,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2021-05-03 00:00:58,584 INFO L87 Difference]: Start difference. First operand 139 states and 162 transitions. Second operand has 41 states, 41 states have (on average 1.7560975609756098) internal successors, (72), 39 states have internal predecessors, (72), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:01:01,549 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:01,682 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:02,617 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:10,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:01:10,453 INFO L93 Difference]: Finished difference Result 243 states and 288 transitions. [2021-05-03 00:01:10,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-03 00:01:10,453 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7560975609756098) internal successors, (72), 39 states have internal predecessors, (72), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 105 [2021-05-03 00:01:10,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:01:10,454 INFO L225 Difference]: With dead ends: 243 [2021-05-03 00:01:10,454 INFO L226 Difference]: Without dead ends: 173 [2021-05-03 00:01:10,455 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2732 ImplicationChecksByTransitivity, 10779.0ms TimeCoverageRelationStatistics Valid=4234, Invalid=8876, Unknown=0, NotChecked=0, Total=13110 [2021-05-03 00:01:10,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-03 00:01:10,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 140. [2021-05-03 00:01:10,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 121 states have (on average 1.1570247933884297) internal successors, (140), 121 states have internal predecessors, (140), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:01:10,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 163 transitions. [2021-05-03 00:01:10,475 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 163 transitions. Word has length 105 [2021-05-03 00:01:10,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:01:10,475 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 163 transitions. [2021-05-03 00:01:10,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.7560975609756098) internal successors, (72), 39 states have internal predecessors, (72), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:01:10,475 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 163 transitions. [2021-05-03 00:01:10,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-05-03 00:01:10,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:01:10,476 INFO L523 BasicCegarLoop]: trace histogram [60, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:01:10,476 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-03 00:01:10,476 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:01:10,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:01:10,476 INFO L82 PathProgramCache]: Analyzing trace with hash -523023286, now seen corresponding path program 36 times [2021-05-03 00:01:10,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:01:10,476 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [813138966] [2021-05-03 00:01:10,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:01:10,478 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:01:10,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:10,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:01:10,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:10,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:01:10,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:10,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:01:10,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:11,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:01:11,329 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:01:11,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [813138966] [2021-05-03 00:01:11,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [813138966] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:01:11,330 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:01:11,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-03 00:01:11,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822836669] [2021-05-03 00:01:11,330 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-03 00:01:11,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:01:11,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-03 00:01:11,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2021-05-03 00:01:11,331 INFO L87 Difference]: Start difference. First operand 140 states and 163 transitions. Second operand has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 40 states have internal predecessors, (73), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:01:13,377 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:01:14,162 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:14,531 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:14,913 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:15,581 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:15,728 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:17,434 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:17,783 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:19,359 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:20,125 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:22,800 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:24,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:01:24,233 INFO L93 Difference]: Finished difference Result 248 states and 294 transitions. [2021-05-03 00:01:24,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-03 00:01:24,234 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 40 states have internal predecessors, (73), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 106 [2021-05-03 00:01:24,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:01:24,235 INFO L225 Difference]: With dead ends: 248 [2021-05-03 00:01:24,235 INFO L226 Difference]: Without dead ends: 177 [2021-05-03 00:01:24,236 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2882 ImplicationChecksByTransitivity, 11332.9ms TimeCoverageRelationStatistics Valid=4462, Invalid=9344, Unknown=0, NotChecked=0, Total=13806 [2021-05-03 00:01:24,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-05-03 00:01:24,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 141. [2021-05-03 00:01:24,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 122 states have (on average 1.1557377049180328) internal successors, (141), 122 states have internal predecessors, (141), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:01:24,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 164 transitions. [2021-05-03 00:01:24,256 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 164 transitions. Word has length 106 [2021-05-03 00:01:24,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:01:24,256 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 164 transitions. [2021-05-03 00:01:24,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 40 states have internal predecessors, (73), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:01:24,257 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 164 transitions. [2021-05-03 00:01:24,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-03 00:01:24,257 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:01:24,257 INFO L523 BasicCegarLoop]: trace histogram [61, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:01:24,257 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-03 00:01:24,257 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:01:24,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:01:24,258 INFO L82 PathProgramCache]: Analyzing trace with hash 386454584, now seen corresponding path program 37 times [2021-05-03 00:01:24,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:01:24,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673659653] [2021-05-03 00:01:24,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:01:24,260 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:01:24,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:24,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:01:24,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:24,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:01:24,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:24,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:01:24,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:25,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:01:25,215 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:01:25,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673659653] [2021-05-03 00:01:25,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1673659653] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:01:25,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:01:25,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-03 00:01:25,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922231983] [2021-05-03 00:01:25,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-03 00:01:25,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:01:25,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-03 00:01:25,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2021-05-03 00:01:25,216 INFO L87 Difference]: Start difference. First operand 141 states and 164 transitions. Second operand has 43 states, 43 states have (on average 1.7209302325581395) internal successors, (74), 41 states have internal predecessors, (74), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:01:30,439 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:01:30,658 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:31,230 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:31,471 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:31,844 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:32,238 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:32,382 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:32,654 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:32,800 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:33,541 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:34,226 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:34,738 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:35,116 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:35,327 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:36,526 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:36,664 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:36,792 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:37,964 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:38,119 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:38,286 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:38,457 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:40,063 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:42,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:01:42,084 INFO L93 Difference]: Finished difference Result 253 states and 300 transitions. [2021-05-03 00:01:42,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-03 00:01:42,085 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.7209302325581395) internal successors, (74), 41 states have internal predecessors, (74), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 107 [2021-05-03 00:01:42,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:01:42,086 INFO L225 Difference]: With dead ends: 253 [2021-05-03 00:01:42,086 INFO L226 Difference]: Without dead ends: 181 [2021-05-03 00:01:42,087 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3036 ImplicationChecksByTransitivity, 12008.6ms TimeCoverageRelationStatistics Valid=4696, Invalid=9824, Unknown=0, NotChecked=0, Total=14520 [2021-05-03 00:01:42,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-03 00:01:42,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 142. [2021-05-03 00:01:42,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 123 states have (on average 1.1544715447154472) internal successors, (142), 123 states have internal predecessors, (142), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:01:42,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 165 transitions. [2021-05-03 00:01:42,108 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 165 transitions. Word has length 107 [2021-05-03 00:01:42,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:01:42,109 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 165 transitions. [2021-05-03 00:01:42,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.7209302325581395) internal successors, (74), 41 states have internal predecessors, (74), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:01:42,109 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 165 transitions. [2021-05-03 00:01:42,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-05-03 00:01:42,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:01:42,109 INFO L523 BasicCegarLoop]: trace histogram [62, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:01:42,109 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-03 00:01:42,110 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:01:42,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:01:42,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1484502518, now seen corresponding path program 38 times [2021-05-03 00:01:42,110 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:01:42,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1501233224] [2021-05-03 00:01:42,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:01:42,111 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:01:42,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:42,272 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:01:42,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:01:42,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:42,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:01:42,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:42,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:01:42,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:43,089 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:01:43,089 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:01:43,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1501233224] [2021-05-03 00:01:43,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1501233224] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:01:43,089 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:01:43,089 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-03 00:01:43,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826606403] [2021-05-03 00:01:43,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-03 00:01:43,090 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:01:43,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-03 00:01:43,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=1066, Unknown=0, NotChecked=0, Total=1892 [2021-05-03 00:01:43,090 INFO L87 Difference]: Start difference. First operand 142 states and 165 transitions. Second operand has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 42 states have internal predecessors, (75), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:01:46,802 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:46,945 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:47,355 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:48,584 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:49,103 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:51,651 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:52,194 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:52,357 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:52,515 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:56,131 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:01:56,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:01:56,486 INFO L93 Difference]: Finished difference Result 258 states and 306 transitions. [2021-05-03 00:01:56,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-05-03 00:01:56,486 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 42 states have internal predecessors, (75), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 108 [2021-05-03 00:01:56,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:01:56,487 INFO L225 Difference]: With dead ends: 258 [2021-05-03 00:01:56,487 INFO L226 Difference]: Without dead ends: 185 [2021-05-03 00:01:56,488 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3194 ImplicationChecksByTransitivity, 12096.5ms TimeCoverageRelationStatistics Valid=4936, Invalid=10316, Unknown=0, NotChecked=0, Total=15252 [2021-05-03 00:01:56,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-03 00:01:56,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 143. [2021-05-03 00:01:56,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 124 states have (on average 1.153225806451613) internal successors, (143), 124 states have internal predecessors, (143), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:01:56,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 166 transitions. [2021-05-03 00:01:56,510 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 166 transitions. Word has length 108 [2021-05-03 00:01:56,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:01:56,510 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 166 transitions. [2021-05-03 00:01:56,510 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 42 states have internal predecessors, (75), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:01:56,510 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 166 transitions. [2021-05-03 00:01:56,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-03 00:01:56,510 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:01:56,511 INFO L523 BasicCegarLoop]: trace histogram [63, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:01:56,511 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-03 00:01:56,511 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:01:56,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:01:56,512 INFO L82 PathProgramCache]: Analyzing trace with hash 645369464, now seen corresponding path program 39 times [2021-05-03 00:01:56,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:01:56,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336993925] [2021-05-03 00:01:56,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:01:56,514 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:01:56,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:56,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:01:56,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:56,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:01:56,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:56,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:01:56,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:01:57,540 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:01:57,541 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:01:57,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336993925] [2021-05-03 00:01:57,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [336993925] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:01:57,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:01:57,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-03 00:01:57,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225293434] [2021-05-03 00:01:57,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-03 00:01:57,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:01:57,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-03 00:01:57,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=867, Invalid=1113, Unknown=0, NotChecked=0, Total=1980 [2021-05-03 00:01:57,542 INFO L87 Difference]: Start difference. First operand 143 states and 166 transitions. Second operand has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 43 states have internal predecessors, (76), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:01:59,192 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:01:59,659 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:00,532 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:00,675 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:00,818 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:00,966 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:03,154 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:04,574 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:05,028 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:05,155 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:05,408 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:05,919 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:06,649 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:06,820 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:07,157 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:10,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:02:10,826 INFO L93 Difference]: Finished difference Result 263 states and 312 transitions. [2021-05-03 00:02:10,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-03 00:02:10,827 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 43 states have internal predecessors, (76), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 109 [2021-05-03 00:02:10,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:02:10,828 INFO L225 Difference]: With dead ends: 263 [2021-05-03 00:02:10,828 INFO L226 Difference]: Without dead ends: 189 [2021-05-03 00:02:10,830 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3356 ImplicationChecksByTransitivity, 12690.7ms TimeCoverageRelationStatistics Valid=5182, Invalid=10820, Unknown=0, NotChecked=0, Total=16002 [2021-05-03 00:02:10,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-05-03 00:02:10,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 144. [2021-05-03 00:02:10,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 125 states have (on average 1.152) internal successors, (144), 125 states have internal predecessors, (144), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:02:10,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 167 transitions. [2021-05-03 00:02:10,860 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 167 transitions. Word has length 109 [2021-05-03 00:02:10,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:02:10,860 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 167 transitions. [2021-05-03 00:02:10,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 43 states have internal predecessors, (76), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:02:10,861 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 167 transitions. [2021-05-03 00:02:10,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-03 00:02:10,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:02:10,861 INFO L523 BasicCegarLoop]: trace histogram [64, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:02:10,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-03 00:02:10,861 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:02:10,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:02:10,862 INFO L82 PathProgramCache]: Analyzing trace with hash -2048075830, now seen corresponding path program 40 times [2021-05-03 00:02:10,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:02:10,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [310082602] [2021-05-03 00:02:10,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:02:10,864 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:02:10,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:10,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:02:10,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:11,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:02:11,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:11,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:02:11,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:11,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:02:11,846 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:02:11,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [310082602] [2021-05-03 00:02:11,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [310082602] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:02:11,847 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:02:11,847 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-03 00:02:11,847 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136036190] [2021-05-03 00:02:11,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-03 00:02:11,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:02:11,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-03 00:02:11,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=909, Invalid=1161, Unknown=0, NotChecked=0, Total=2070 [2021-05-03 00:02:11,848 INFO L87 Difference]: Start difference. First operand 144 states and 167 transitions. Second operand has 46 states, 46 states have (on average 1.673913043478261) internal successors, (77), 44 states have internal predecessors, (77), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:02:14,430 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:02:15,683 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:15,946 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:16,082 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:16,219 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:16,637 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:16,781 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:17,075 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:17,229 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:17,532 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:17,705 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:17,884 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:18,077 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:18,418 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:18,598 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:18,784 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:19,144 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:19,910 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:20,334 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:20,557 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:02:20,702 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:21,157 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:22,790 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:23,921 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:25,189 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:02:27,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:02:27,364 INFO L93 Difference]: Finished difference Result 268 states and 318 transitions. [2021-05-03 00:02:27,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-05-03 00:02:27,365 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.673913043478261) internal successors, (77), 44 states have internal predecessors, (77), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 110 [2021-05-03 00:02:27,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:02:27,366 INFO L225 Difference]: With dead ends: 268 [2021-05-03 00:02:27,366 INFO L226 Difference]: Without dead ends: 193 [2021-05-03 00:02:27,367 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3522 ImplicationChecksByTransitivity, 13377.1ms TimeCoverageRelationStatistics Valid=5434, Invalid=11336, Unknown=0, NotChecked=0, Total=16770 [2021-05-03 00:02:27,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-05-03 00:02:27,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 145. [2021-05-03 00:02:27,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 126 states have (on average 1.1507936507936507) internal successors, (145), 126 states have internal predecessors, (145), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:02:27,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 168 transitions. [2021-05-03 00:02:27,391 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 168 transitions. Word has length 110 [2021-05-03 00:02:27,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:02:27,391 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 168 transitions. [2021-05-03 00:02:27,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.673913043478261) internal successors, (77), 44 states have internal predecessors, (77), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:02:27,391 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 168 transitions. [2021-05-03 00:02:27,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-03 00:02:27,392 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:02:27,392 INFO L523 BasicCegarLoop]: trace histogram [65, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:02:27,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-03 00:02:27,392 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:02:27,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:02:27,392 INFO L82 PathProgramCache]: Analyzing trace with hash 354465976, now seen corresponding path program 41 times [2021-05-03 00:02:27,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:02:27,392 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [278244801] [2021-05-03 00:02:27,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:02:27,394 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:02:27,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:27,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:02:27,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:27,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:02:27,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:27,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:02:27,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:28,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:02:28,491 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:02:28,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [278244801] [2021-05-03 00:02:28,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [278244801] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:02:28,492 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:02:28,492 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-03 00:02:28,492 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555752289] [2021-05-03 00:02:28,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-03 00:02:28,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:02:28,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-03 00:02:28,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=1210, Unknown=0, NotChecked=0, Total=2162 [2021-05-03 00:02:28,493 INFO L87 Difference]: Start difference. First operand 145 states and 168 transitions. Second operand has 47 states, 47 states have (on average 1.6595744680851063) internal successors, (78), 45 states have internal predecessors, (78), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:02:35,665 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:36,043 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:36,176 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:36,311 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:36,720 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:37,295 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:37,444 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:39,137 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:39,321 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:47,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:02:47,874 INFO L93 Difference]: Finished difference Result 273 states and 324 transitions. [2021-05-03 00:02:47,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-03 00:02:47,875 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.6595744680851063) internal successors, (78), 45 states have internal predecessors, (78), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 111 [2021-05-03 00:02:47,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:02:47,876 INFO L225 Difference]: With dead ends: 273 [2021-05-03 00:02:47,876 INFO L226 Difference]: Without dead ends: 197 [2021-05-03 00:02:47,877 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3692 ImplicationChecksByTransitivity, 13600.9ms TimeCoverageRelationStatistics Valid=5692, Invalid=11864, Unknown=0, NotChecked=0, Total=17556 [2021-05-03 00:02:47,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-03 00:02:47,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 146. [2021-05-03 00:02:47,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 127 states have (on average 1.1496062992125984) internal successors, (146), 127 states have internal predecessors, (146), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:02:47,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 169 transitions. [2021-05-03 00:02:47,901 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 169 transitions. Word has length 111 [2021-05-03 00:02:47,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:02:47,901 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 169 transitions. [2021-05-03 00:02:47,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.6595744680851063) internal successors, (78), 45 states have internal predecessors, (78), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:02:47,901 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 169 transitions. [2021-05-03 00:02:47,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-05-03 00:02:47,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:02:47,902 INFO L523 BasicCegarLoop]: trace histogram [66, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:02:47,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-03 00:02:47,902 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:02:47,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:02:47,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1818817930, now seen corresponding path program 42 times [2021-05-03 00:02:47,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:02:47,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301706105] [2021-05-03 00:02:47,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:02:47,904 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:02:47,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:48,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:02:48,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:48,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:02:48,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:48,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:02:48,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:02:49,002 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:02:49,002 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:02:49,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301706105] [2021-05-03 00:02:49,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [301706105] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:02:49,002 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:02:49,002 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-03 00:02:49,003 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919989415] [2021-05-03 00:02:49,003 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-03 00:02:49,003 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:02:49,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-03 00:02:49,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=996, Invalid=1260, Unknown=0, NotChecked=0, Total=2256 [2021-05-03 00:02:49,004 INFO L87 Difference]: Start difference. First operand 146 states and 169 transitions. Second operand has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 46 states have internal predecessors, (79), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:02:53,683 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:02:53,800 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:54,253 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:54,373 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:54,621 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:54,750 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:55,009 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:55,270 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:55,676 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:56,116 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:56,286 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:56,439 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:56,588 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:57,053 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:57,227 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:57,421 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:57,945 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:58,151 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:58,341 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:58,534 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:58,730 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:58,920 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:59,329 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:59,551 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:02:59,795 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:03,363 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:07,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:03:07,719 INFO L93 Difference]: Finished difference Result 278 states and 330 transitions. [2021-05-03 00:03:07,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-03 00:03:07,720 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 46 states have internal predecessors, (79), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 112 [2021-05-03 00:03:07,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:03:07,721 INFO L225 Difference]: With dead ends: 278 [2021-05-03 00:03:07,721 INFO L226 Difference]: Without dead ends: 201 [2021-05-03 00:03:07,722 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3866 ImplicationChecksByTransitivity, 14416.5ms TimeCoverageRelationStatistics Valid=5956, Invalid=12404, Unknown=0, NotChecked=0, Total=18360 [2021-05-03 00:03:07,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-05-03 00:03:07,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 147. [2021-05-03 00:03:07,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 128 states have (on average 1.1484375) internal successors, (147), 128 states have internal predecessors, (147), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:03:07,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 170 transitions. [2021-05-03 00:03:07,748 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 170 transitions. Word has length 112 [2021-05-03 00:03:07,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:03:07,748 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 170 transitions. [2021-05-03 00:03:07,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 46 states have internal predecessors, (79), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:03:07,749 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 170 transitions. [2021-05-03 00:03:07,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-03 00:03:07,749 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:03:07,749 INFO L523 BasicCegarLoop]: trace histogram [67, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:03:07,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-03 00:03:07,749 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:03:07,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:03:07,750 INFO L82 PathProgramCache]: Analyzing trace with hash -30911752, now seen corresponding path program 43 times [2021-05-03 00:03:07,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:03:07,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363718070] [2021-05-03 00:03:07,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:03:07,751 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:03:07,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:07,915 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:03:07,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:03:07,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:07,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:03:07,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:07,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:03:07,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:09,000 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:03:09,001 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:03:09,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363718070] [2021-05-03 00:03:09,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1363718070] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:03:09,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:03:09,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-03 00:03:09,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926028183] [2021-05-03 00:03:09,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-03 00:03:09,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:03:09,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-03 00:03:09,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1041, Invalid=1311, Unknown=0, NotChecked=0, Total=2352 [2021-05-03 00:03:09,002 INFO L87 Difference]: Start difference. First operand 147 states and 170 transitions. Second operand has 49 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 47 states have internal predecessors, (80), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:03:14,367 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:03:14,479 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:14,594 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:14,711 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:14,947 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:15,073 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:15,200 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:15,325 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:15,452 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:15,585 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:15,715 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:15,845 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:15,978 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:16,114 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:16,252 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:16,390 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:16,532 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:16,675 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:16,823 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:17,113 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:17,263 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:17,415 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:17,736 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:17,911 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:18,111 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:18,286 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:18,468 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:18,650 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:18,838 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:19,029 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:19,223 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:19,605 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:19,813 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:20,018 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:20,243 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:20,489 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:20,737 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:21,145 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:21,260 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:21,459 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:03:22,710 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:23,897 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:24,562 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:24,921 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:25,106 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:28,808 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:28,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:03:28,994 INFO L93 Difference]: Finished difference Result 283 states and 336 transitions. [2021-05-03 00:03:28,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-05-03 00:03:28,994 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 47 states have internal predecessors, (80), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 113 [2021-05-03 00:03:28,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:03:28,995 INFO L225 Difference]: With dead ends: 283 [2021-05-03 00:03:28,995 INFO L226 Difference]: Without dead ends: 205 [2021-05-03 00:03:28,996 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4044 ImplicationChecksByTransitivity, 15120.4ms TimeCoverageRelationStatistics Valid=6226, Invalid=12956, Unknown=0, NotChecked=0, Total=19182 [2021-05-03 00:03:28,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-05-03 00:03:29,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 148. [2021-05-03 00:03:29,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 129 states have (on average 1.1472868217054264) internal successors, (148), 129 states have internal predecessors, (148), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:03:29,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 171 transitions. [2021-05-03 00:03:29,023 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 171 transitions. Word has length 113 [2021-05-03 00:03:29,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:03:29,023 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 171 transitions. [2021-05-03 00:03:29,023 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 47 states have internal predecessors, (80), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:03:29,023 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 171 transitions. [2021-05-03 00:03:29,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-03 00:03:29,024 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:03:29,024 INFO L523 BasicCegarLoop]: trace histogram [68, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:03:29,024 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-03 00:03:29,024 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:03:29,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:03:29,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1537957046, now seen corresponding path program 44 times [2021-05-03 00:03:29,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:03:29,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1599679345] [2021-05-03 00:03:29,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:03:29,026 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:03:29,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:29,179 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:03:29,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:03:29,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:29,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:03:29,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:29,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:03:29,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:30,349 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:03:30,349 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:03:30,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1599679345] [2021-05-03 00:03:30,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1599679345] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:03:30,349 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:03:30,349 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-03 00:03:30,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801759427] [2021-05-03 00:03:30,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-03 00:03:30,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:03:30,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-03 00:03:30,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1087, Invalid=1363, Unknown=0, NotChecked=0, Total=2450 [2021-05-03 00:03:30,350 INFO L87 Difference]: Start difference. First operand 148 states and 171 transitions. Second operand has 50 states, 50 states have (on average 1.62) internal successors, (81), 48 states have internal predecessors, (81), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:03:30,491 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:39,978 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:40,091 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:03:40,210 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:40,324 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:40,439 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:40,556 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:40,683 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:40,804 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:41,048 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:41,174 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:41,302 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:41,432 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:41,563 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:41,697 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:41,835 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:42,249 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:42,395 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:42,540 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:42,691 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:42,847 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:43,001 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:43,160 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:43,318 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:43,497 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:43,689 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:43,897 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:44,075 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:44,259 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:44,441 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:44,631 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:44,831 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:45,022 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:45,218 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:45,425 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:45,647 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:45,872 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:46,109 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:46,367 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:46,637 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:46,847 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:47,054 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:47,170 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:47,372 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:03:47,690 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:03:47,811 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:51,753 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:52,330 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:55,143 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:03:55,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:03:55,363 INFO L93 Difference]: Finished difference Result 288 states and 342 transitions. [2021-05-03 00:03:55,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-05-03 00:03:55,364 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.62) internal successors, (81), 48 states have internal predecessors, (81), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 114 [2021-05-03 00:03:55,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:03:55,365 INFO L225 Difference]: With dead ends: 288 [2021-05-03 00:03:55,365 INFO L226 Difference]: Without dead ends: 209 [2021-05-03 00:03:55,366 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4226 ImplicationChecksByTransitivity, 15701.6ms TimeCoverageRelationStatistics Valid=6502, Invalid=13520, Unknown=0, NotChecked=0, Total=20022 [2021-05-03 00:03:55,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-03 00:03:55,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 149. [2021-05-03 00:03:55,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 130 states have (on average 1.146153846153846) internal successors, (149), 130 states have internal predecessors, (149), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:03:55,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 172 transitions. [2021-05-03 00:03:55,395 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 172 transitions. Word has length 114 [2021-05-03 00:03:55,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:03:55,395 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 172 transitions. [2021-05-03 00:03:55,395 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.62) internal successors, (81), 48 states have internal predecessors, (81), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:03:55,395 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 172 transitions. [2021-05-03 00:03:55,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-03 00:03:55,395 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:03:55,396 INFO L523 BasicCegarLoop]: trace histogram [69, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:03:55,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-03 00:03:55,396 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:03:55,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:03:55,396 INFO L82 PathProgramCache]: Analyzing trace with hash -1011720904, now seen corresponding path program 45 times [2021-05-03 00:03:55,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:03:55,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [970541969] [2021-05-03 00:03:55,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:03:55,398 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:03:55,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:55,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:03:55,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:55,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:03:55,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:55,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:03:55,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:03:56,746 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:03:56,747 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:03:56,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [970541969] [2021-05-03 00:03:56,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [970541969] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:03:56,747 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:03:56,747 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-03 00:03:56,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935921098] [2021-05-03 00:03:56,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-03 00:03:56,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:03:56,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-03 00:03:56,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1134, Invalid=1416, Unknown=0, NotChecked=0, Total=2550 [2021-05-03 00:03:56,748 INFO L87 Difference]: Start difference. First operand 149 states and 172 transitions. Second operand has 51 states, 51 states have (on average 1.607843137254902) internal successors, (82), 49 states have internal predecessors, (82), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:04:04,669 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:04,784 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:04:04,898 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:05,014 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:05,133 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:05,259 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:05,381 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:05,507 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:05,634 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:05,761 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:05,891 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:06,026 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:06,161 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:06,302 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:06,441 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:06,587 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:06,729 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:06,874 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:07,035 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:07,182 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:07,332 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:07,485 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:07,654 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:07,812 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:07,968 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:08,127 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:08,320 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:08,507 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:08,718 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:08,900 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:09,087 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:09,287 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:09,476 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:09,665 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:09,863 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:10,067 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:10,277 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:10,496 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:10,717 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:10,959 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:11,233 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:11,524 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:11,758 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:11,971 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:12,089 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:12,303 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:12,426 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:12,650 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:12,777 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:12,993 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:04:13,115 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:13,253 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:13,386 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:13,515 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:13,646 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:13,782 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:13,925 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:14,066 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:14,208 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:14,356 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:14,506 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:14,659 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:14,817 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:14,991 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:15,157 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:15,320 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:15,486 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:15,828 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:16,006 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:16,185 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:16,371 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:16,565 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:16,756 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:16,946 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:17,143 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:17,341 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:17,543 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:17,754 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:17,962 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:18,173 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:18,385 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:18,603 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:18,822 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:19,048 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:19,275 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:19,501 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:19,731 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:19,963 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:20,205 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:20,445 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:20,687 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:21,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:04:21,155 INFO L93 Difference]: Finished difference Result 293 states and 348 transitions. [2021-05-03 00:04:21,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-05-03 00:04:21,156 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.607843137254902) internal successors, (82), 49 states have internal predecessors, (82), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 115 [2021-05-03 00:04:21,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:04:21,157 INFO L225 Difference]: With dead ends: 293 [2021-05-03 00:04:21,157 INFO L226 Difference]: Without dead ends: 213 [2021-05-03 00:04:21,158 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4412 ImplicationChecksByTransitivity, 16694.0ms TimeCoverageRelationStatistics Valid=6784, Invalid=14096, Unknown=0, NotChecked=0, Total=20880 [2021-05-03 00:04:21,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-03 00:04:21,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 150. [2021-05-03 00:04:21,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 131 states have (on average 1.1450381679389312) internal successors, (150), 131 states have internal predecessors, (150), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:04:21,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 173 transitions. [2021-05-03 00:04:21,187 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 173 transitions. Word has length 115 [2021-05-03 00:04:21,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:04:21,187 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 173 transitions. [2021-05-03 00:04:21,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.607843137254902) internal successors, (82), 49 states have internal predecessors, (82), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:04:21,187 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 173 transitions. [2021-05-03 00:04:21,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-03 00:04:21,188 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:04:21,188 INFO L523 BasicCegarLoop]: trace histogram [70, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:04:21,188 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-03 00:04:21,188 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:04:21,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:04:21,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1878269686, now seen corresponding path program 46 times [2021-05-03 00:04:21,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:04:21,188 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1799905046] [2021-05-03 00:04:21,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:04:21,190 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:04:21,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:04:21,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:04:21,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:04:21,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:04:21,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:04:21,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:04:21,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:04:22,649 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:04:22,649 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:04:22,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1799905046] [2021-05-03 00:04:22,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1799905046] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:04:22,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:04:22,649 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-03 00:04:22,649 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137072356] [2021-05-03 00:04:22,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-03 00:04:22,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:04:22,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-03 00:04:22,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1182, Invalid=1470, Unknown=0, NotChecked=0, Total=2652 [2021-05-03 00:04:22,651 INFO L87 Difference]: Start difference. First operand 150 states and 173 transitions. Second operand has 52 states, 52 states have (on average 1.5961538461538463) internal successors, (83), 50 states have internal predecessors, (83), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:04:22,797 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:26,411 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:26,530 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:04:26,649 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:26,775 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:26,901 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:27,027 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:27,159 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:27,289 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:27,422 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:27,556 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:27,691 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:27,824 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:27,959 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:28,097 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:28,236 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:28,379 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:28,522 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:28,667 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:28,815 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:28,969 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:29,120 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:29,273 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:29,427 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:29,585 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:29,748 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:29,913 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:30,099 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:30,294 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:30,497 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:30,683 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:30,870 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:31,061 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:31,258 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:31,460 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:31,665 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:31,868 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:32,075 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:32,290 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:32,513 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:32,750 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:33,000 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:33,263 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:33,491 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:33,716 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:33,847 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:34,065 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:34,190 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:34,412 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:34,540 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:34,770 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:34,901 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:35,134 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:04:35,270 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:35,420 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:35,565 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:35,705 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:35,847 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:35,993 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:36,143 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:36,298 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:36,458 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:36,614 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:36,775 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:36,940 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:37,111 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:37,284 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:37,461 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:37,639 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:37,826 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:38,014 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:38,201 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:38,388 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:38,574 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:38,766 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:38,959 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:39,161 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:39,362 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:39,569 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:39,777 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:39,995 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:40,210 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:40,430 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:40,645 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:40,865 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:41,090 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:41,323 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:41,552 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:41,788 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:42,019 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:42,259 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:42,501 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:42,743 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:43,000 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:43,245 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:43,495 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:43,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:04:43,667 INFO L93 Difference]: Finished difference Result 298 states and 354 transitions. [2021-05-03 00:04:43,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-03 00:04:43,668 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.5961538461538463) internal successors, (83), 50 states have internal predecessors, (83), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 116 [2021-05-03 00:04:43,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:04:43,668 INFO L225 Difference]: With dead ends: 298 [2021-05-03 00:04:43,669 INFO L226 Difference]: Without dead ends: 217 [2021-05-03 00:04:43,670 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4602 ImplicationChecksByTransitivity, 17752.9ms TimeCoverageRelationStatistics Valid=7072, Invalid=14684, Unknown=0, NotChecked=0, Total=21756 [2021-05-03 00:04:43,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-05-03 00:04:43,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 151. [2021-05-03 00:04:43,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 132 states have (on average 1.143939393939394) internal successors, (151), 132 states have internal predecessors, (151), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:04:43,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 174 transitions. [2021-05-03 00:04:43,700 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 174 transitions. Word has length 116 [2021-05-03 00:04:43,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:04:43,700 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 174 transitions. [2021-05-03 00:04:43,700 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.5961538461538463) internal successors, (83), 50 states have internal predecessors, (83), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:04:43,700 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 174 transitions. [2021-05-03 00:04:43,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-03 00:04:43,700 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:04:43,700 INFO L523 BasicCegarLoop]: trace histogram [71, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:04:43,701 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-03 00:04:43,701 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:04:43,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:04:43,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1323489144, now seen corresponding path program 47 times [2021-05-03 00:04:43,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:04:43,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567569682] [2021-05-03 00:04:43,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:04:43,702 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:04:43,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:04:43,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:04:43,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:04:43,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:04:43,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:04:43,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:04:43,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:04:45,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:04:45,337 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:04:45,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567569682] [2021-05-03 00:04:45,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1567569682] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:04:45,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:04:45,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-03 00:04:45,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854366409] [2021-05-03 00:04:45,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-03 00:04:45,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:04:45,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-03 00:04:45,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1231, Invalid=1525, Unknown=0, NotChecked=0, Total=2756 [2021-05-03 00:04:45,338 INFO L87 Difference]: Start difference. First operand 151 states and 174 transitions. Second operand has 53 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 51 states have internal predecessors, (84), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:04:45,489 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:04:54,382 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:54,513 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:04:54,640 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:54,767 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:54,896 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:55,028 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:55,162 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:55,302 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:55,441 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:55,580 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:55,722 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:55,871 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:56,016 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:56,164 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:56,312 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:56,464 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:56,618 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:56,774 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:56,933 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:57,092 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:57,261 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:57,427 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:57,598 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:57,767 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:57,937 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:58,111 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:58,312 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:58,523 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:58,751 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:58,946 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:59,145 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:59,345 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:59,559 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:59,777 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:04:59,989 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:00,200 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:00,415 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:00,654 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:00,892 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:01,169 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:01,471 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:01,808 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:02,063 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:02,323 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:02,458 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:02,691 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:02,822 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:03,057 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:03,187 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:03,427 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:03,562 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:03,813 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:03,953 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:04,191 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:05:04,334 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:04,495 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:04,651 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:04,801 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:04,955 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:05,118 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:05,276 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:05,437 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:05,602 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:05,770 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:05,939 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:06,111 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:06,289 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:06,479 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:06,665 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:06,853 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:07,044 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:07,237 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:07,437 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:07,640 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:07,850 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:08,055 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:08,270 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:08,494 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:08,714 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:08,932 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:09,156 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:09,374 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:09,591 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:09,823 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:10,054 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:10,284 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:10,524 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:10,762 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:11,002 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:11,244 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:11,494 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:11,749 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:12,016 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:12,282 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:12,547 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:12,818 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:13,088 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:13,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:05:13,354 INFO L93 Difference]: Finished difference Result 303 states and 360 transitions. [2021-05-03 00:05:13,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-05-03 00:05:13,355 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 51 states have internal predecessors, (84), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 117 [2021-05-03 00:05:13,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:05:13,356 INFO L225 Difference]: With dead ends: 303 [2021-05-03 00:05:13,356 INFO L226 Difference]: Without dead ends: 221 [2021-05-03 00:05:13,358 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4796 ImplicationChecksByTransitivity, 19312.8ms TimeCoverageRelationStatistics Valid=7366, Invalid=15284, Unknown=0, NotChecked=0, Total=22650 [2021-05-03 00:05:13,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-05-03 00:05:13,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 152. [2021-05-03 00:05:13,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 133 states have (on average 1.1428571428571428) internal successors, (152), 133 states have internal predecessors, (152), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:05:13,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 175 transitions. [2021-05-03 00:05:13,389 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 175 transitions. Word has length 117 [2021-05-03 00:05:13,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:05:13,390 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 175 transitions. [2021-05-03 00:05:13,390 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 51 states have internal predecessors, (84), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:05:13,390 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 175 transitions. [2021-05-03 00:05:13,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-05-03 00:05:13,390 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:05:13,390 INFO L523 BasicCegarLoop]: trace histogram [72, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:05:13,390 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-03 00:05:13,390 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:05:13,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:05:13,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1793765066, now seen corresponding path program 48 times [2021-05-03 00:05:13,391 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:05:13,391 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259417957] [2021-05-03 00:05:13,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:05:13,392 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:05:13,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:05:13,546 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:05:13,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:05:13,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:05:13,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:05:13,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:05:13,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:05:13,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:05:15,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:05:15,138 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:05:15,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259417957] [2021-05-03 00:05:15,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [259417957] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:05:15,138 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:05:15,138 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-03 00:05:15,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29769199] [2021-05-03 00:05:15,139 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-03 00:05:15,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:05:15,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-03 00:05:15,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1281, Invalid=1581, Unknown=0, NotChecked=0, Total=2862 [2021-05-03 00:05:15,139 INFO L87 Difference]: Start difference. First operand 152 states and 175 transitions. Second operand has 54 states, 54 states have (on average 1.5740740740740742) internal successors, (85), 52 states have internal predecessors, (85), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:05:15,297 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:25,136 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:25,259 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:05:25,386 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:25,517 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:25,649 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:25,780 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:25,917 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:26,050 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:26,185 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:26,325 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:26,470 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:26,616 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:26,766 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:26,912 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:27,062 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:27,221 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:27,380 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:27,536 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:27,695 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:27,855 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:28,020 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:28,189 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:28,357 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:28,530 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:28,697 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:28,866 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:29,063 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:29,267 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:29,505 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:29,707 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:29,914 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:30,119 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:30,330 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:30,547 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:30,761 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:30,981 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:31,206 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:31,449 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:31,698 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:31,968 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:32,279 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:32,603 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:32,839 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:33,072 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:33,201 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:33,440 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:33,571 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:33,808 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:33,942 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:34,174 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:34,312 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:34,553 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:34,692 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:34,943 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:35,088 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:35,329 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:05:35,475 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:35,640 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:35,794 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:35,941 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:36,091 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:36,251 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:36,409 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:36,569 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:36,735 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:36,901 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:37,075 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:37,250 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:37,428 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:37,618 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:37,802 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:37,990 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:38,181 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:38,376 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:38,579 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:38,782 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:38,988 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:39,192 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:39,398 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:39,608 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:39,821 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:40,041 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:40,265 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:40,506 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:40,737 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:40,975 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:41,209 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:41,458 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:41,711 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:41,959 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:42,219 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:42,477 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:42,737 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:42,999 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:43,274 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:43,542 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:43,816 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:44,088 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:44,360 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:44,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:05:44,634 INFO L93 Difference]: Finished difference Result 308 states and 366 transitions. [2021-05-03 00:05:44,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-05-03 00:05:44,635 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.5740740740740742) internal successors, (85), 52 states have internal predecessors, (85), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 118 [2021-05-03 00:05:44,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:05:44,636 INFO L225 Difference]: With dead ends: 308 [2021-05-03 00:05:44,636 INFO L226 Difference]: Without dead ends: 225 [2021-05-03 00:05:44,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4994 ImplicationChecksByTransitivity, 19861.4ms TimeCoverageRelationStatistics Valid=7666, Invalid=15896, Unknown=0, NotChecked=0, Total=23562 [2021-05-03 00:05:44,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2021-05-03 00:05:44,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 153. [2021-05-03 00:05:44,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 134 states have (on average 1.1417910447761195) internal successors, (153), 134 states have internal predecessors, (153), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:05:44,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 176 transitions. [2021-05-03 00:05:44,671 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 176 transitions. Word has length 118 [2021-05-03 00:05:44,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:05:44,671 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 176 transitions. [2021-05-03 00:05:44,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.5740740740740742) internal successors, (85), 52 states have internal predecessors, (85), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:05:44,671 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 176 transitions. [2021-05-03 00:05:44,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-03 00:05:44,671 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:05:44,671 INFO L523 BasicCegarLoop]: trace histogram [73, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:05:44,672 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-03 00:05:44,672 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:05:44,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:05:44,672 INFO L82 PathProgramCache]: Analyzing trace with hash -807550536, now seen corresponding path program 49 times [2021-05-03 00:05:44,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:05:44,672 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1106137912] [2021-05-03 00:05:44,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:05:44,674 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:05:44,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:05:44,826 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:05:44,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:05:44,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:05:44,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:05:44,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:05:44,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:05:44,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:05:46,499 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:05:46,499 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:05:46,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1106137912] [2021-05-03 00:05:46,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1106137912] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:05:46,499 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:05:46,499 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-03 00:05:46,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742002613] [2021-05-03 00:05:46,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-03 00:05:46,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:05:46,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-03 00:05:46,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1332, Invalid=1638, Unknown=0, NotChecked=0, Total=2970 [2021-05-03 00:05:46,500 INFO L87 Difference]: Start difference. First operand 153 states and 176 transitions. Second operand has 55 states, 55 states have (on average 1.5636363636363637) internal successors, (86), 53 states have internal predecessors, (86), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:05:46,662 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:05:54,689 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:54,817 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:05:54,944 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:55,082 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:55,219 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:55,370 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:55,513 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:55,654 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:55,793 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:55,936 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:56,080 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:56,227 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:56,381 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:56,534 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:56,686 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:56,848 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:57,004 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:57,163 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:57,327 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:57,495 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:57,667 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:57,837 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:58,011 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:58,189 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:58,365 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:58,543 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:58,742 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:58,955 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:59,192 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:59,397 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:59,613 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:05:59,824 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:00,039 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:00,258 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:00,480 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:00,707 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:00,933 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:01,179 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:01,431 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:01,710 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:02,031 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:02,341 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:02,583 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:02,823 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:02,958 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:03,194 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:03,331 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:03,569 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:03,700 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:03,938 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:04,080 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:04,325 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:04,466 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:04,715 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:04,860 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:05,103 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:05,252 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:05,507 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:06:05,660 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:05,832 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:06,001 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:06,160 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:06,329 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:06,500 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:06,673 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:06,849 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:07,028 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:07,220 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:07,415 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:07,606 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:07,800 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:08,009 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:08,207 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:08,406 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:08,607 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:08,816 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:09,034 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:09,253 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:09,468 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:09,691 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:09,918 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:10,150 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:10,387 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:10,618 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:10,855 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:11,093 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:11,334 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:11,580 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:11,832 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:12,088 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:12,346 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:12,610 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:12,875 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:13,144 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:13,417 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:13,696 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:13,981 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:14,274 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:14,553 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:14,845 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:15,131 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:15,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:06:15,398 INFO L93 Difference]: Finished difference Result 313 states and 372 transitions. [2021-05-03 00:06:15,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-05-03 00:06:15,399 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.5636363636363637) internal successors, (86), 53 states have internal predecessors, (86), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 119 [2021-05-03 00:06:15,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:06:15,400 INFO L225 Difference]: With dead ends: 313 [2021-05-03 00:06:15,400 INFO L226 Difference]: Without dead ends: 229 [2021-05-03 00:06:15,401 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5196 ImplicationChecksByTransitivity, 21177.2ms TimeCoverageRelationStatistics Valid=7972, Invalid=16520, Unknown=0, NotChecked=0, Total=24492 [2021-05-03 00:06:15,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-05-03 00:06:15,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 154. [2021-05-03 00:06:15,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 135 states have (on average 1.1407407407407408) internal successors, (154), 135 states have internal predecessors, (154), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:06:15,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 177 transitions. [2021-05-03 00:06:15,436 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 177 transitions. Word has length 119 [2021-05-03 00:06:15,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:06:15,436 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 177 transitions. [2021-05-03 00:06:15,436 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.5636363636363637) internal successors, (86), 53 states have internal predecessors, (86), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:06:15,436 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 177 transitions. [2021-05-03 00:06:15,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-05-03 00:06:15,437 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:06:15,437 INFO L523 BasicCegarLoop]: trace histogram [74, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:06:15,437 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-03 00:06:15,437 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:06:15,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:06:15,437 INFO L82 PathProgramCache]: Analyzing trace with hash 156044426, now seen corresponding path program 50 times [2021-05-03 00:06:15,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:06:15,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [41454533] [2021-05-03 00:06:15,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:06:15,439 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:06:15,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:06:15,591 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:06:15,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:06:15,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:06:15,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:06:15,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:06:15,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:06:15,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:06:17,286 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:06:17,286 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:06:17,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [41454533] [2021-05-03 00:06:17,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [41454533] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:06:17,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:06:17,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-03 00:06:17,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181190611] [2021-05-03 00:06:17,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-03 00:06:17,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:06:17,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-03 00:06:17,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1384, Invalid=1696, Unknown=0, NotChecked=0, Total=3080 [2021-05-03 00:06:17,287 INFO L87 Difference]: Start difference. First operand 154 states and 177 transitions. Second operand has 56 states, 56 states have (on average 1.5535714285714286) internal successors, (87), 54 states have internal predecessors, (87), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:06:17,454 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:33,085 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:33,220 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:06:33,358 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:33,499 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:33,641 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:33,781 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:33,927 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:34,080 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:34,229 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:34,378 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:34,536 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:34,691 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:34,855 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:35,018 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:35,183 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:35,345 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:35,513 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:35,682 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:35,852 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:36,032 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:36,208 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:36,386 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:36,566 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:36,754 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:36,944 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:37,126 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:37,338 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:37,563 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:37,812 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:38,030 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:38,252 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:38,477 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:38,708 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:38,949 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:39,194 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:39,432 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:39,680 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:39,952 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:40,227 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:40,512 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:40,823 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:41,146 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:41,403 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:41,664 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:41,804 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:42,050 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:42,187 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:42,448 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:42,592 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:42,848 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:42,991 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:43,245 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:43,395 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:43,655 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:43,807 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:44,068 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:44,232 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:44,498 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:06:44,660 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:44,921 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:06:45,090 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:45,273 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:45,449 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:45,625 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:45,799 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:45,974 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:46,152 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:46,333 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:46,517 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:46,705 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:46,896 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:47,097 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:47,300 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:47,509 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:47,718 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:47,935 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:48,152 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:48,372 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:48,595 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:48,818 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:49,045 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:49,274 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:49,508 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:49,747 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:49,987 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:50,242 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:50,487 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:50,738 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:50,992 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:51,246 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:51,514 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:51,778 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:52,048 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:52,329 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:52,606 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:52,890 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:53,180 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:53,469 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:53,758 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:54,054 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:54,350 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:54,659 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:54,968 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:06:55,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:06:55,235 INFO L93 Difference]: Finished difference Result 318 states and 378 transitions. [2021-05-03 00:06:55,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-05-03 00:06:55,236 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.5535714285714286) internal successors, (87), 54 states have internal predecessors, (87), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 120 [2021-05-03 00:06:55,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:06:55,237 INFO L225 Difference]: With dead ends: 318 [2021-05-03 00:06:55,237 INFO L226 Difference]: Without dead ends: 233 [2021-05-03 00:06:55,238 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5402 ImplicationChecksByTransitivity, 22574.6ms TimeCoverageRelationStatistics Valid=8284, Invalid=17156, Unknown=0, NotChecked=0, Total=25440 [2021-05-03 00:06:55,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-05-03 00:06:55,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 155. [2021-05-03 00:06:55,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 136 states have (on average 1.1397058823529411) internal successors, (155), 136 states have internal predecessors, (155), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:06:55,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 178 transitions. [2021-05-03 00:06:55,276 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 178 transitions. Word has length 120 [2021-05-03 00:06:55,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:06:55,276 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 178 transitions. [2021-05-03 00:06:55,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 1.5535714285714286) internal successors, (87), 54 states have internal predecessors, (87), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:06:55,276 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 178 transitions. [2021-05-03 00:06:55,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-03 00:06:55,277 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:06:55,277 INFO L523 BasicCegarLoop]: trace histogram [75, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:06:55,277 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-03 00:06:55,277 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:06:55,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:06:55,277 INFO L82 PathProgramCache]: Analyzing trace with hash -37282824, now seen corresponding path program 51 times [2021-05-03 00:06:55,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:06:55,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009985575] [2021-05-03 00:06:55,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:06:55,279 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:06:55,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:06:55,459 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:06:55,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:06:55,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:06:55,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:06:55,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:06:55,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:06:55,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:06:57,456 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:06:57,456 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:06:57,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009985575] [2021-05-03 00:06:57,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1009985575] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:06:57,457 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:06:57,457 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-03 00:06:57,457 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642945668] [2021-05-03 00:06:57,457 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-03 00:06:57,457 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:06:57,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-03 00:06:57,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1437, Invalid=1755, Unknown=0, NotChecked=0, Total=3192 [2021-05-03 00:06:57,458 INFO L87 Difference]: Start difference. First operand 155 states and 178 transitions. Second operand has 57 states, 57 states have (on average 1.543859649122807) internal successors, (88), 55 states have internal predecessors, (88), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:06:57,636 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:09,786 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:09,927 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:07:10,068 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:10,209 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:10,351 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:10,497 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:10,649 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:10,797 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:10,947 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:11,104 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:11,269 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:11,430 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:11,590 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:11,749 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:11,919 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:12,092 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:12,265 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:12,440 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:12,616 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:12,798 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:12,978 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:13,161 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:13,344 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:13,534 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:13,728 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:13,922 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:14,147 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:14,390 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:14,663 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:14,893 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:15,122 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:15,357 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:15,620 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:15,864 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:16,109 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:16,355 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:16,608 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:16,891 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:17,187 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:17,510 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:17,880 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:18,246 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:18,523 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:18,788 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:18,935 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:19,191 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:19,338 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:19,597 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:19,748 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:20,021 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:20,172 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:20,432 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:20,585 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:20,854 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:21,012 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:21,286 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:21,444 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:21,717 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:21,880 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:22,171 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:22,344 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:22,625 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:07:22,808 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:23,009 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:23,199 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:23,380 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:23,568 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:23,757 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:23,948 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:24,147 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:24,349 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:24,546 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:24,752 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:24,961 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:25,175 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:25,392 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:25,615 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:25,844 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:26,077 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:26,310 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:26,549 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:26,792 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:27,035 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:27,308 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:27,562 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:27,818 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:28,077 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:28,341 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:28,612 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:28,887 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:29,160 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:29,435 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:29,713 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:29,996 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:30,287 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:30,583 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:30,874 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:31,171 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:31,472 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:31,775 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:32,096 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:32,412 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:32,735 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:33,056 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:33,378 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:33,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:07:33,715 INFO L93 Difference]: Finished difference Result 323 states and 384 transitions. [2021-05-03 00:07:33,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2021-05-03 00:07:33,716 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.543859649122807) internal successors, (88), 55 states have internal predecessors, (88), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 121 [2021-05-03 00:07:33,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:07:33,717 INFO L225 Difference]: With dead ends: 323 [2021-05-03 00:07:33,717 INFO L226 Difference]: Without dead ends: 237 [2021-05-03 00:07:33,718 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5612 ImplicationChecksByTransitivity, 24383.9ms TimeCoverageRelationStatistics Valid=8602, Invalid=17804, Unknown=0, NotChecked=0, Total=26406 [2021-05-03 00:07:33,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-05-03 00:07:33,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 156. [2021-05-03 00:07:33,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 137 states have (on average 1.1386861313868613) internal successors, (156), 137 states have internal predecessors, (156), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:07:33,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 179 transitions. [2021-05-03 00:07:33,756 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 179 transitions. Word has length 121 [2021-05-03 00:07:33,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:07:33,756 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 179 transitions. [2021-05-03 00:07:33,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.543859649122807) internal successors, (88), 55 states have internal predecessors, (88), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:07:33,756 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 179 transitions. [2021-05-03 00:07:33,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-03 00:07:33,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:07:33,757 INFO L523 BasicCegarLoop]: trace histogram [76, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:07:33,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-03 00:07:33,757 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:07:33,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:07:33,757 INFO L82 PathProgramCache]: Analyzing trace with hash -1735460278, now seen corresponding path program 52 times [2021-05-03 00:07:33,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:07:33,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505704477] [2021-05-03 00:07:33,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:07:33,759 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:07:33,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:07:33,925 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:07:33,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:07:33,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:07:33,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:07:33,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:07:33,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:07:33,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:07:36,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:07:36,133 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:07:36,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505704477] [2021-05-03 00:07:36,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [505704477] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:07:36,133 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:07:36,133 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-03 00:07:36,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081202577] [2021-05-03 00:07:36,134 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-03 00:07:36,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:07:36,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-03 00:07:36,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1491, Invalid=1815, Unknown=0, NotChecked=0, Total=3306 [2021-05-03 00:07:36,134 INFO L87 Difference]: Start difference. First operand 156 states and 179 transitions. Second operand has 58 states, 58 states have (on average 1.5344827586206897) internal successors, (89), 56 states have internal predecessors, (89), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:07:36,328 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:49,269 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:49,414 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:07:49,563 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:49,713 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:49,872 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:50,026 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:50,181 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:50,339 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:50,500 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:50,662 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:50,825 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:50,991 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:51,160 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:51,332 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:51,513 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:51,695 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:51,873 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:52,059 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:52,252 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:52,446 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:52,643 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:52,838 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:53,041 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:53,245 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:53,446 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:53,655 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:53,891 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:54,141 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:54,426 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:54,671 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:54,913 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:55,161 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:55,415 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:55,673 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:55,943 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:56,207 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:56,472 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:56,781 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:57,088 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:57,427 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:57,825 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:58,225 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:58,509 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:58,799 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:58,962 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:59,230 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:59,383 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:07:59,653 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:07:59,809 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:00,086 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:00,245 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:00,529 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:00,693 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:00,967 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:01,134 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:01,412 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:01,583 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:01,875 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:02,041 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:02,333 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:02,510 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:02,802 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:02,979 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:03,277 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:08:03,467 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:03,674 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:03,870 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:04,058 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:04,250 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:04,448 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:04,652 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:04,864 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:05,075 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:05,289 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:05,511 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:05,733 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:05,957 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:06,187 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:06,420 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:06,666 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:06,913 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:07,161 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:07,413 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:07,666 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:07,919 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:08,184 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:08,449 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:08,717 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:08,992 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:09,263 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:09,543 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:09,831 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:10,114 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:10,400 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:10,689 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:10,980 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:11,279 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:11,578 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:11,881 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:12,194 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:12,512 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:12,828 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:13,156 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:13,476 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:13,808 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:14,137 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:14,478 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:14,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:08:14,847 INFO L93 Difference]: Finished difference Result 328 states and 390 transitions. [2021-05-03 00:08:14,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-05-03 00:08:14,848 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.5344827586206897) internal successors, (89), 56 states have internal predecessors, (89), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 122 [2021-05-03 00:08:14,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:08:14,849 INFO L225 Difference]: With dead ends: 328 [2021-05-03 00:08:14,849 INFO L226 Difference]: Without dead ends: 241 [2021-05-03 00:08:14,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5826 ImplicationChecksByTransitivity, 26058.8ms TimeCoverageRelationStatistics Valid=8926, Invalid=18464, Unknown=0, NotChecked=0, Total=27390 [2021-05-03 00:08:14,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-05-03 00:08:14,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 157. [2021-05-03 00:08:14,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 138 states have (on average 1.1376811594202898) internal successors, (157), 138 states have internal predecessors, (157), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:08:14,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 180 transitions. [2021-05-03 00:08:14,890 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 180 transitions. Word has length 122 [2021-05-03 00:08:14,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:08:14,890 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 180 transitions. [2021-05-03 00:08:14,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 1.5344827586206897) internal successors, (89), 56 states have internal predecessors, (89), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:08:14,890 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 180 transitions. [2021-05-03 00:08:14,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-03 00:08:14,891 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:08:14,891 INFO L523 BasicCegarLoop]: trace histogram [77, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:08:14,891 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-03 00:08:14,891 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:08:14,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:08:14,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1455613496, now seen corresponding path program 53 times [2021-05-03 00:08:14,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:08:14,891 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304964337] [2021-05-03 00:08:14,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:08:14,893 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:08:14,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:08:15,074 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:08:15,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:08:15,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:08:15,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:08:15,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:08:15,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:08:15,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:08:17,470 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:08:17,470 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:08:17,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304964337] [2021-05-03 00:08:17,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1304964337] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:08:17,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:08:17,471 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-03 00:08:17,471 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124067816] [2021-05-03 00:08:17,471 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-03 00:08:17,471 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:08:17,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-03 00:08:17,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1546, Invalid=1876, Unknown=0, NotChecked=0, Total=3422 [2021-05-03 00:08:17,472 INFO L87 Difference]: Start difference. First operand 157 states and 180 transitions. Second operand has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 57 states have internal predecessors, (90), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:08:17,673 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:22,817 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:22,965 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:08:23,117 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:23,276 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:23,431 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:23,587 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:23,747 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:23,911 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:24,083 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:24,252 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:24,425 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:24,604 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:24,781 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:24,964 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:25,152 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:25,334 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:25,519 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:25,704 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:25,897 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:26,093 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:26,294 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:26,503 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:26,707 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:26,915 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:27,118 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:27,327 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:27,581 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:27,844 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:28,136 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:28,389 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:28,644 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:28,896 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:29,152 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:29,410 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:29,685 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:29,954 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:30,234 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:30,526 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:30,816 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:31,127 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:31,441 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:31,775 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:32,064 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:32,359 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:32,528 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:32,804 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:32,964 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:33,248 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:33,409 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:33,695 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:33,867 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:34,162 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:34,334 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:34,629 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:34,799 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:35,092 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:35,269 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:35,571 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:35,752 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:36,053 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:36,239 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:36,540 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:36,739 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:37,050 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:08:37,245 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:37,552 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:08:37,752 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:37,972 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:38,183 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:38,384 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:38,597 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:38,802 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:39,010 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:39,226 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:39,444 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:39,665 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:39,891 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:40,127 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:40,361 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:40,605 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:40,840 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:41,083 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:41,329 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:41,574 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:41,832 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:42,095 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:42,353 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:42,627 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:42,904 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:43,183 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:43,473 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:43,764 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:44,060 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:44,358 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:44,656 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:44,955 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:45,271 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:45,588 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:45,901 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:46,238 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:46,553 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:46,887 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:47,227 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:47,564 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:47,907 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:48,256 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:48,606 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:48,957 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:49,311 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:08:49,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:08:49,553 INFO L93 Difference]: Finished difference Result 333 states and 396 transitions. [2021-05-03 00:08:49,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-05-03 00:08:49,554 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 57 states have internal predecessors, (90), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 123 [2021-05-03 00:08:49,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:08:49,555 INFO L225 Difference]: With dead ends: 333 [2021-05-03 00:08:49,555 INFO L226 Difference]: Without dead ends: 245 [2021-05-03 00:08:49,557 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6044 ImplicationChecksByTransitivity, 27704.0ms TimeCoverageRelationStatistics Valid=9256, Invalid=19136, Unknown=0, NotChecked=0, Total=28392 [2021-05-03 00:08:49,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-03 00:08:49,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 158. [2021-05-03 00:08:49,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 139 states have (on average 1.1366906474820144) internal successors, (158), 139 states have internal predecessors, (158), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:08:49,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 181 transitions. [2021-05-03 00:08:49,614 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 181 transitions. Word has length 123 [2021-05-03 00:08:49,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:08:49,614 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 181 transitions. [2021-05-03 00:08:49,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 57 states have internal predecessors, (90), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:08:49,614 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 181 transitions. [2021-05-03 00:08:49,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-03 00:08:49,614 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:08:49,615 INFO L523 BasicCegarLoop]: trace histogram [78, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:08:49,615 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-03 00:08:49,615 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:08:49,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:08:49,615 INFO L82 PathProgramCache]: Analyzing trace with hash 1594652682, now seen corresponding path program 54 times [2021-05-03 00:08:49,615 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:08:49,615 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785054400] [2021-05-03 00:08:49,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:08:49,617 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:08:49,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:08:49,791 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:08:49,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:08:49,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:08:49,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:08:49,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:08:49,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:08:49,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:08:52,278 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:08:52,279 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:08:52,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785054400] [2021-05-03 00:08:52,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [785054400] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:08:52,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:08:52,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-03 00:08:52,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426335352] [2021-05-03 00:08:52,285 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-03 00:08:52,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:08:52,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-03 00:08:52,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1602, Invalid=1938, Unknown=0, NotChecked=0, Total=3540 [2021-05-03 00:08:52,286 INFO L87 Difference]: Start difference. First operand 158 states and 181 transitions. Second operand has 60 states, 60 states have (on average 1.5166666666666666) internal successors, (91), 58 states have internal predecessors, (91), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:08:52,489 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:07,055 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:07,214 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:09:07,370 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:07,539 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:07,703 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:07,867 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:08,038 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:08,215 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:08,390 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:08,572 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:08,749 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:08,923 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:09,107 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:09,293 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:09,476 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:09,662 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:09,863 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:10,058 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:10,261 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:10,454 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:10,655 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:10,866 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:11,081 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:11,300 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:11,518 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:11,743 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:12,009 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:12,295 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:12,618 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:12,894 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:13,177 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:13,461 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:13,752 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:14,046 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:14,339 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:14,639 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:14,941 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:15,291 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:15,640 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:16,034 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:16,495 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:16,940 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:17,251 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:17,571 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:17,746 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:18,060 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:18,233 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:18,545 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:18,720 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:19,022 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:19,196 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:19,509 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:19,697 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:20,002 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:20,187 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:20,501 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:20,688 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:21,001 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:21,191 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:21,513 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:21,708 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:22,032 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:22,242 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:22,574 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:22,784 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:23,125 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:23,341 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:23,682 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:09:23,905 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:24,149 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:24,376 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:24,603 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:24,831 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:25,058 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:25,289 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:25,529 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:25,773 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:26,654 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:26,852 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:27,064 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:27,278 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:27,499 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:27,718 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:27,945 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:28,175 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:28,403 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:28,639 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:28,888 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:29,130 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:29,377 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:29,606 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:29,835 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:30,084 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:30,336 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:30,590 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:30,845 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:31,103 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:31,366 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:31,641 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:31,912 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:32,185 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:32,458 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:32,729 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:33,018 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:33,296 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:33,584 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:33,878 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:34,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:09:34,167 INFO L93 Difference]: Finished difference Result 338 states and 402 transitions. [2021-05-03 00:09:34,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-05-03 00:09:34,168 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.5166666666666666) internal successors, (91), 58 states have internal predecessors, (91), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 124 [2021-05-03 00:09:34,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:09:34,169 INFO L225 Difference]: With dead ends: 338 [2021-05-03 00:09:34,169 INFO L226 Difference]: Without dead ends: 249 [2021-05-03 00:09:34,171 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6266 ImplicationChecksByTransitivity, 27612.9ms TimeCoverageRelationStatistics Valid=9592, Invalid=19820, Unknown=0, NotChecked=0, Total=29412 [2021-05-03 00:09:34,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-05-03 00:09:34,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 159. [2021-05-03 00:09:34,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 140 states have (on average 1.1357142857142857) internal successors, (159), 140 states have internal predecessors, (159), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:09:34,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 182 transitions. [2021-05-03 00:09:34,213 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 182 transitions. Word has length 124 [2021-05-03 00:09:34,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:09:34,213 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 182 transitions. [2021-05-03 00:09:34,213 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 1.5166666666666666) internal successors, (91), 58 states have internal predecessors, (91), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:09:34,213 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 182 transitions. [2021-05-03 00:09:34,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-03 00:09:34,214 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:09:34,214 INFO L523 BasicCegarLoop]: trace histogram [79, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:09:34,214 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-03 00:09:34,214 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:09:34,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:09:34,214 INFO L82 PathProgramCache]: Analyzing trace with hash 1609900152, now seen corresponding path program 55 times [2021-05-03 00:09:34,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:09:34,214 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488753086] [2021-05-03 00:09:34,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:09:34,216 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:09:34,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:09:34,375 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:09:34,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:09:34,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:09:34,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:09:34,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:09:34,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:09:34,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:09:36,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:09:36,223 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:09:36,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488753086] [2021-05-03 00:09:36,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1488753086] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:09:36,223 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:09:36,223 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-03 00:09:36,223 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691649699] [2021-05-03 00:09:36,223 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-03 00:09:36,223 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:09:36,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-03 00:09:36,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1659, Invalid=2001, Unknown=0, NotChecked=0, Total=3660 [2021-05-03 00:09:36,224 INFO L87 Difference]: Start difference. First operand 159 states and 182 transitions. Second operand has 61 states, 61 states have (on average 1.5081967213114753) internal successors, (92), 59 states have internal predecessors, (92), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:09:36,381 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:50,164 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:50,283 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:09:50,411 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:50,539 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:50,659 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:50,792 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:50,921 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:51,048 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:51,182 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:51,319 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:51,458 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:51,595 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:51,729 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:51,863 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:52,009 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:52,148 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:52,289 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:52,433 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:52,578 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:52,723 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:52,872 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:53,021 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:53,171 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:53,331 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:53,484 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:53,642 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:53,834 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:54,045 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:54,273 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:54,480 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:54,684 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:54,886 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:55,090 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:55,299 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:55,516 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:55,734 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:55,951 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:56,192 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:56,433 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:56,707 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:57,004 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:57,325 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:57,571 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:57,820 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:57,953 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:58,177 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:58,307 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:58,526 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:58,652 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:58,872 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:59,006 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:59,227 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:59,361 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:59,592 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:09:59,726 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:09:59,953 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:00,089 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:00,332 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:00,479 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:00,723 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:00,876 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:01,124 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:01,278 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:01,548 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:01,698 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:01,954 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:02,118 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:02,362 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:02,519 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:02,768 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:10:02,933 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:03,111 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:03,279 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:03,441 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:03,607 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:03,779 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:03,950 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:04,122 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:04,295 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:04,470 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:04,653 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:04,845 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:05,041 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:05,256 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:05,462 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:05,665 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:05,863 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:06,081 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:06,295 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:06,510 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:06,722 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:06,934 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:07,150 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:07,369 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:07,593 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:07,827 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:08,056 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:08,289 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:08,521 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:08,753 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:08,997 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:09,238 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:09,494 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:09,764 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:10,053 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:10,325 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:10,589 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:10,851 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:11,117 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:11,384 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:11,659 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:11,930 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:12,208 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:12,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:10:12,470 INFO L93 Difference]: Finished difference Result 343 states and 408 transitions. [2021-05-03 00:10:12,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-05-03 00:10:12,471 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.5081967213114753) internal successors, (92), 59 states have internal predecessors, (92), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 125 [2021-05-03 00:10:12,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:10:12,472 INFO L225 Difference]: With dead ends: 343 [2021-05-03 00:10:12,472 INFO L226 Difference]: Without dead ends: 253 [2021-05-03 00:10:12,473 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6492 ImplicationChecksByTransitivity, 22398.2ms TimeCoverageRelationStatistics Valid=9934, Invalid=20516, Unknown=0, NotChecked=0, Total=30450 [2021-05-03 00:10:12,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-05-03 00:10:12,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 160. [2021-05-03 00:10:12,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 141 states have (on average 1.1347517730496455) internal successors, (160), 141 states have internal predecessors, (160), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:10:12,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 183 transitions. [2021-05-03 00:10:12,518 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 183 transitions. Word has length 125 [2021-05-03 00:10:12,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:10:12,518 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 183 transitions. [2021-05-03 00:10:12,518 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 1.5081967213114753) internal successors, (92), 59 states have internal predecessors, (92), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:10:12,518 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 183 transitions. [2021-05-03 00:10:12,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-05-03 00:10:12,518 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:10:12,518 INFO L523 BasicCegarLoop]: trace histogram [80, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:10:12,519 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-03 00:10:12,519 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:10:12,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:10:12,519 INFO L82 PathProgramCache]: Analyzing trace with hash 2082571722, now seen corresponding path program 56 times [2021-05-03 00:10:12,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:10:12,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [717884496] [2021-05-03 00:10:12,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:10:12,521 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:10:12,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:10:12,669 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:10:12,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:10:12,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:10:12,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:10:12,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:10:12,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:10:12,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:10:14,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:10:14,611 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:10:14,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [717884496] [2021-05-03 00:10:14,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [717884496] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:10:14,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:10:14,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-03 00:10:14,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340427040] [2021-05-03 00:10:14,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-03 00:10:14,612 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:10:14,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-03 00:10:14,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1717, Invalid=2065, Unknown=0, NotChecked=0, Total=3782 [2021-05-03 00:10:14,613 INFO L87 Difference]: Start difference. First operand 160 states and 183 transitions. Second operand has 62 states, 62 states have (on average 1.5) internal successors, (93), 60 states have internal predecessors, (93), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:10:14,769 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:24,352 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:24,480 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-03 00:10:24,609 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:24,740 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:24,874 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:25,009 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:25,157 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:25,317 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:25,470 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:25,626 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:25,780 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:25,937 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:26,094 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:26,243 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:26,393 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:26,545 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:26,706 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:26,869 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:27,048 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:27,221 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:27,388 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:27,571 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:27,753 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:27,923 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:28,100 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:28,270 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:28,491 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:28,711 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:28,945 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:29,157 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:29,385 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:29,625 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:29,849 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:30,069 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:30,305 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:30,561 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:30,800 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:31,054 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:31,305 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:31,579 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:31,878 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:32,171 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:32,417 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:32,659 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:32,794 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:33,041 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:33,173 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:33,422 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:33,569 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:33,830 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:33,983 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:34,233 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:34,376 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:34,620 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:34,765 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:35,024 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:35,184 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:35,463 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:35,619 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:35,868 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:36,023 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:36,283 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:36,440 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:36,699 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:36,870 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:37,124 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:37,289 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:37,546 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:37,714 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:37,983 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-03 00:10:38,152 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:38,435 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-03 00:10:38,614 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:38,808 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:38,989 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:39,159 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:39,342 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:39,521 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:39,704 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:39,888 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:40,079 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:40,273 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:40,486 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:40,705 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:40,906 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:41,123 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:41,338 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:41,554 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:41,772 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:42,008 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:42,240 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:42,478 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:42,717 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:42,953 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:43,193 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:43,441 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:43,685 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:43,940 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:44,212 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:44,466 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:44,726 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:44,992 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:45,258 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:45,529 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:45,807 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:46,081 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:46,366 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:46,645 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:46,926 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:47,211 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:47,510 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:47,820 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:48,152 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:48,483 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:48,800 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-03 00:10:49,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:10:49,029 INFO L93 Difference]: Finished difference Result 348 states and 414 transitions. [2021-05-03 00:10:49,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-05-03 00:10:49,030 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.5) internal successors, (93), 60 states have internal predecessors, (93), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 126 [2021-05-03 00:10:49,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:10:49,032 INFO L225 Difference]: With dead ends: 348 [2021-05-03 00:10:49,032 INFO L226 Difference]: Without dead ends: 257 [2021-05-03 00:10:49,034 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6722 ImplicationChecksByTransitivity, 24800.0ms TimeCoverageRelationStatistics Valid=10282, Invalid=21224, Unknown=0, NotChecked=0, Total=31506 [2021-05-03 00:10:49,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-05-03 00:10:49,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 161. [2021-05-03 00:10:49,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 142 states have (on average 1.1338028169014085) internal successors, (161), 142 states have internal predecessors, (161), 13 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-03 00:10:49,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 184 transitions. [2021-05-03 00:10:49,085 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 184 transitions. Word has length 126 [2021-05-03 00:10:49,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:10:49,086 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 184 transitions. [2021-05-03 00:10:49,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 1.5) internal successors, (93), 60 states have internal predecessors, (93), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:10:49,086 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 184 transitions. [2021-05-03 00:10:49,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-03 00:10:49,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:10:49,086 INFO L523 BasicCegarLoop]: trace histogram [81, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:10:49,086 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-03 00:10:49,086 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:10:49,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:10:49,087 INFO L82 PathProgramCache]: Analyzing trace with hash -444478792, now seen corresponding path program 57 times [2021-05-03 00:10:49,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:10:49,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471105014] [2021-05-03 00:10:49,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:10:49,089 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:10:49,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:10:49,254 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-03 00:10:49,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:10:49,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:10:49,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:10:49,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:10:49,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:10:49,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:10:51,483 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:10:51,483 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:10:51,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471105014] [2021-05-03 00:10:51,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [471105014] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:10:51,483 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:10:51,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-03 00:10:51,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243083859] [2021-05-03 00:10:51,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-03 00:10:51,484 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:10:51,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-03 00:10:51,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1776, Invalid=2130, Unknown=0, NotChecked=0, Total=3906 [2021-05-03 00:10:51,485 INFO L87 Difference]: Start difference. First operand 161 states and 184 transitions. Second operand has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 61 states have internal predecessors, (94), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:10:51,654 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127