/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-6253b08 [2021-05-06 11:42:37,501 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:42:37,503 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:42:37,548 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 11:42:37,548 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 11:42:37,550 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 11:42:37,552 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 11:42:37,556 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 11:42:37,569 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 11:42:37,569 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 11:42:37,570 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 11:42:37,570 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 11:42:37,570 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:42:37,571 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:42:37,572 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:42:37,572 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:42:37,573 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:42:37,573 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:42:37,574 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:42:37,575 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:42:37,576 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:42:37,577 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:42:37,578 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:42:37,578 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:42:37,580 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-06 11:42:37,580 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-06 11:42:37,580 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-06 11:42:37,581 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-06 11:42:37,581 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-06 11:42:37,582 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-06 11:42:37,582 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-06 11:42:37,582 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-06 11:42:37,583 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-06 11:42:37,583 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-06 11:42:37,584 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-06 11:42:37,584 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-06 11:42:37,585 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-06 11:42:37,585 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-06 11:42:37,585 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:42:37,586 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:42:37,587 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:42:37,624 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:42:37,638 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:42:37,638 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:42:37,640 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:42:37,640 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:42:37,640 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:42:37,640 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:42:37,641 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:42:37,641 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:42:37,641 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:42:37,641 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:42:37,641 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:42:37,642 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:42:37,642 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:42:37,642 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:42:37,642 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:42:37,642 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:42:37,642 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:42:37,642 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:42:37,642 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:42:37,643 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:42:37,643 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:42:37,643 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:42:37,643 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:42:37,658 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:42:37,909 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:42:37,922 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:42:37,924 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:42:37,924 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:42:37,925 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:42:37,926 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/discover_list.c [2021-05-06 11:42:37,971 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/feb4375bb/2ac56b14201d49eb93800d92983cf1bf/FLAG2346390ca [2021-05-06 11:42:38,362 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:42:38,362 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/discover_list.c [2021-05-06 11:42:38,370 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/feb4375bb/2ac56b14201d49eb93800d92983cf1bf/FLAG2346390ca [2021-05-06 11:42:38,383 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/feb4375bb/2ac56b14201d49eb93800d92983cf1bf [2021-05-06 11:42:38,385 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:42:38,386 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:42:38,389 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:42:38,389 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:42:38,392 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:42:38,392 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:42:38" (1/1) ... [2021-05-06 11:42:38,393 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c82cc5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38, skipping insertion in model container [2021-05-06 11:42:38,393 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:42:38" (1/1) ... [2021-05-06 11:42:38,398 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:42:38,433 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:42:38,567 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] [2021-05-06 11:42:38,631 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:42:38,639 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:42:38,652 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] [2021-05-06 11:42:38,682 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:42:38,704 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:42:38,709 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38 WrapperNode [2021-05-06 11:42:38,709 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:42:38,710 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:42:38,710 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:42:38,710 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:42:38,718 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38" (1/1) ... [2021-05-06 11:42:38,718 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38" (1/1) ... [2021-05-06 11:42:38,747 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38" (1/1) ... [2021-05-06 11:42:38,747 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38" (1/1) ... [2021-05-06 11:42:38,792 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38" (1/1) ... [2021-05-06 11:42:38,813 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38" (1/1) ... [2021-05-06 11:42:38,816 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38" (1/1) ... [2021-05-06 11:42:38,821 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:42:38,822 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:42:38,822 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:42:38,822 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:42:38,822 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38" (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 [2021-05-06 11:42:38,886 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:42:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:42:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:42:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:42:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_get_func_def_resp_len [2021-05-06 11:42:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_is_naa5 [2021-05-06 11:42:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure dStrHex [2021-05-06 11:42:38,887 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_get_num [2021-05-06 11:42:38,888 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_get_llnum [2021-05-06 11:42:38,888 INFO L138 BoogieDeclarations]: Found implementation of procedure do_discover_list [2021-05-06 11:42:38,888 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:42:38,888 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2021-05-06 11:42:38,888 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:42:38,889 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:42:38,889 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:42:38,889 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:42:38,889 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-05-06 11:42:38,890 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 11:42:38,890 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2021-05-06 11:42:38,891 INFO L130 BoogieDeclarations]: Found specification of procedure sscanf [2021-05-06 11:42:38,891 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-05-06 11:42:38,891 INFO L130 BoogieDeclarations]: Found specification of procedure memset [2021-05-06 11:42:38,891 INFO L130 BoogieDeclarations]: Found specification of procedure strcmp [2021-05-06 11:42:38,891 INFO L130 BoogieDeclarations]: Found specification of procedure strchr [2021-05-06 11:42:38,891 INFO L130 BoogieDeclarations]: Found specification of procedure strlen [2021-05-06 11:42:38,891 INFO L130 BoogieDeclarations]: Found specification of procedure getopt_long [2021-05-06 11:42:38,891 INFO L130 BoogieDeclarations]: Found specification of procedure smp_initiator_open [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure smp_send_req [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure smp_get_func_def_resp_len [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure smp_is_naa5 [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure dStrHex [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure smp_get_num [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure smp_get_llnum [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure do_discover_list [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure main6 [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure sprintf [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure toupper [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:42:38,892 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2021-05-06 11:42:38,893 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:42:38,893 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:42:38,893 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:42:38,893 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-05-06 11:42:38,893 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:42:38,893 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:42:39,874 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:42:39,874 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 11:42:39,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:42:39 BoogieIcfgContainer [2021-05-06 11:42:39,875 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:42:39,876 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:42:39,877 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:42:39,878 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:42:39,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:42:38" (1/3) ... [2021-05-06 11:42:39,879 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@586af3c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:42:39, skipping insertion in model container [2021-05-06 11:42:39,879 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:38" (2/3) ... [2021-05-06 11:42:39,879 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@586af3c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:42:39, skipping insertion in model container [2021-05-06 11:42:39,879 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:42:39" (3/3) ... [2021-05-06 11:42:39,880 INFO L111 eAbstractionObserver]: Analyzing ICFG discover_list.c [2021-05-06 11:42:39,883 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:42:39,886 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:42:39,896 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:42:39,908 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:42:39,909 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:42:39,909 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:42:39,909 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:42:39,909 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:42:39,909 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:42:39,909 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:42:39,909 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:42:39,919 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) [2021-05-06 11:42:39,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 11:42:39,925 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:39,926 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] [2021-05-06 11:42:39,926 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:39,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:39,930 INFO L82 PathProgramCache]: Analyzing trace with hash 467458188, now seen corresponding path program 1 times [2021-05-06 11:42:39,935 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:39,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165105326] [2021-05-06 11:42:39,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:39,980 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:40,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:40,324 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-06 11:42:40,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:40,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:40,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:40,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:40,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-06 11:42:40,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:40,359 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 11:42:40,360 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:40,360 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165105326] [2021-05-06 11:42:40,361 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1165105326] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:40,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:40,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:42:40,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175833125] [2021-05-06 11:42:40,365 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:42:40,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:40,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:42:40,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:42:40,374 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) [2021-05-06 11:42:40,514 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:42:40,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:40,901 INFO L93 Difference]: Finished difference Result 205 states and 313 transitions. [2021-05-06 11:42:40,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:42:40,903 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 [2021-05-06 11:42:40,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:40,910 INFO L225 Difference]: With dead ends: 205 [2021-05-06 11:42:40,910 INFO L226 Difference]: Without dead ends: 99 [2021-05-06 11:42:40,916 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 255.7ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:42:40,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-06 11:42:40,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 76. [2021-05-06 11:42:40,947 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) [2021-05-06 11:42:40,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2021-05-06 11:42:40,949 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 46 [2021-05-06 11:42:40,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:40,949 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2021-05-06 11:42:40,949 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) [2021-05-06 11:42:40,949 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2021-05-06 11:42:40,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 11:42:40,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:40,951 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] [2021-05-06 11:42:40,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:42:40,951 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:40,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:40,952 INFO L82 PathProgramCache]: Analyzing trace with hash -1776525110, now seen corresponding path program 1 times [2021-05-06 11:42:40,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:40,952 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1548855973] [2021-05-06 11:42:40,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:40,954 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:40,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:41,133 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-06 11:42:41,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:41,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:41,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:41,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:41,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-06 11:42:41,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:41,205 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:41,205 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:41,205 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1548855973] [2021-05-06 11:42:41,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1548855973] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:41,206 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:41,206 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:42:41,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276615078] [2021-05-06 11:42:41,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:42:41,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:41,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:42:41,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:42:41,207 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) [2021-05-06 11:42:41,621 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2021-05-06 11:42:41,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:41,811 INFO L93 Difference]: Finished difference Result 136 states and 178 transitions. [2021-05-06 11:42:41,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:42:41,811 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 [2021-05-06 11:42:41,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:41,814 INFO L225 Difference]: With dead ends: 136 [2021-05-06 11:42:41,814 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 11:42:41,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 454.6ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:42:41,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 11:42:41,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-06 11:42:41,840 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) [2021-05-06 11:42:41,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 99 transitions. [2021-05-06 11:42:41,841 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 99 transitions. Word has length 46 [2021-05-06 11:42:41,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:41,841 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 99 transitions. [2021-05-06 11:42:41,841 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) [2021-05-06 11:42:41,841 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 99 transitions. [2021-05-06 11:42:41,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-06 11:42:41,842 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:41,842 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] [2021-05-06 11:42:41,842 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:42:41,842 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:41,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:41,842 INFO L82 PathProgramCache]: Analyzing trace with hash 1831279328, now seen corresponding path program 1 times [2021-05-06 11:42:41,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:41,843 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [844859853] [2021-05-06 11:42:41,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:41,845 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:41,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:41,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:41,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:42,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:42,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:42,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-06 11:42:42,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:42,037 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:42,037 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:42,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [844859853] [2021-05-06 11:42:42,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [844859853] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:42,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:42,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:42:42,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823984689] [2021-05-06 11:42:42,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:42:42,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:42,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:42:42,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:42:42,040 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) [2021-05-06 11:42:42,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:42,730 INFO L93 Difference]: Finished difference Result 138 states and 180 transitions. [2021-05-06 11:42:42,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:42:42,730 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 [2021-05-06 11:42:42,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:42,731 INFO L225 Difference]: With dead ends: 138 [2021-05-06 11:42:42,731 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 11:42:42,731 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 480.8ms TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:42:42,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 11:42:42,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-06 11:42:42,740 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) [2021-05-06 11:42:42,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 100 transitions. [2021-05-06 11:42:42,740 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 100 transitions. Word has length 48 [2021-05-06 11:42:42,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:42,740 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 100 transitions. [2021-05-06 11:42:42,741 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) [2021-05-06 11:42:42,741 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 100 transitions. [2021-05-06 11:42:42,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:42:42,742 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:42,742 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] [2021-05-06 11:42:42,742 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:42:42,742 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:42,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:42,742 INFO L82 PathProgramCache]: Analyzing trace with hash -110265974, now seen corresponding path program 2 times [2021-05-06 11:42:42,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:42,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [942065124] [2021-05-06 11:42:42,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:42,744 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:42,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:42,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:42,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:42,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:42,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:42,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-06 11:42:42,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:42,935 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:42,935 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:42,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [942065124] [2021-05-06 11:42:42,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [942065124] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:42,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:42,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:42:42,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088923597] [2021-05-06 11:42:42,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:42:42,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:42,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:42:42,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:42:42,936 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) [2021-05-06 11:42:43,226 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:42:43,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:43,762 INFO L93 Difference]: Finished difference Result 140 states and 182 transitions. [2021-05-06 11:42:43,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:42:43,762 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 [2021-05-06 11:42:43,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:43,763 INFO L225 Difference]: With dead ends: 140 [2021-05-06 11:42:43,763 INFO L226 Difference]: Without dead ends: 79 [2021-05-06 11:42:43,763 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 579.2ms TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:42:43,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-06 11:42:43,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-06 11:42:43,771 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) [2021-05-06 11:42:43,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 101 transitions. [2021-05-06 11:42:43,772 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 101 transitions. Word has length 50 [2021-05-06 11:42:43,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:43,772 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 101 transitions. [2021-05-06 11:42:43,772 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) [2021-05-06 11:42:43,772 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 101 transitions. [2021-05-06 11:42:43,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 11:42:43,773 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:43,773 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] [2021-05-06 11:42:43,773 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:42:43,773 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:43,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:43,773 INFO L82 PathProgramCache]: Analyzing trace with hash -523287008, now seen corresponding path program 3 times [2021-05-06 11:42:43,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:43,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241394654] [2021-05-06 11:42:43,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:43,775 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:43,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:43,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:43,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:43,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:43,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:43,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-05-06 11:42:43,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:43,938 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:43,938 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:43,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241394654] [2021-05-06 11:42:43,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [241394654] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:43,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:43,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:42:43,939 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143368071] [2021-05-06 11:42:43,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:42:43,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:43,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:42:43,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:42:43,940 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) [2021-05-06 11:42:44,328 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:42:44,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:44,823 INFO L93 Difference]: Finished difference Result 142 states and 184 transitions. [2021-05-06 11:42:44,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:42:44,824 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 [2021-05-06 11:42:44,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:44,825 INFO L225 Difference]: With dead ends: 142 [2021-05-06 11:42:44,825 INFO L226 Difference]: Without dead ends: 80 [2021-05-06 11:42:44,825 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 665.6ms TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:42:44,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-06 11:42:44,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-05-06 11:42:44,833 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) [2021-05-06 11:42:44,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 102 transitions. [2021-05-06 11:42:44,833 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 102 transitions. Word has length 52 [2021-05-06 11:42:44,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:44,833 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 102 transitions. [2021-05-06 11:42:44,834 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) [2021-05-06 11:42:44,834 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 102 transitions. [2021-05-06 11:42:44,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 11:42:44,834 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:44,834 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] [2021-05-06 11:42:44,834 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:42:44,834 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:44,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:44,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1966742966, now seen corresponding path program 4 times [2021-05-06 11:42:44,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:44,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1295879994] [2021-05-06 11:42:44,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:44,837 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:44,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:44,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:44,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:44,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:44,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:45,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-06 11:42:45,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:45,005 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:45,005 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:45,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1295879994] [2021-05-06 11:42:45,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1295879994] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:45,005 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:45,005 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:42:45,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164724766] [2021-05-06 11:42:45,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:42:45,007 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:45,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:42:45,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:42:45,007 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) [2021-05-06 11:42:46,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:46,066 INFO L93 Difference]: Finished difference Result 144 states and 186 transitions. [2021-05-06 11:42:46,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:42:46,066 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 [2021-05-06 11:42:46,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:46,067 INFO L225 Difference]: With dead ends: 144 [2021-05-06 11:42:46,067 INFO L226 Difference]: Without dead ends: 81 [2021-05-06 11:42:46,068 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 787.4ms TimeCoverageRelationStatistics Valid=79, Invalid=193, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:42:46,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-06 11:42:46,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-05-06 11:42:46,074 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) [2021-05-06 11:42:46,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 103 transitions. [2021-05-06 11:42:46,075 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 103 transitions. Word has length 54 [2021-05-06 11:42:46,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:46,075 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 103 transitions. [2021-05-06 11:42:46,075 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) [2021-05-06 11:42:46,075 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 103 transitions. [2021-05-06 11:42:46,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 11:42:46,076 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:46,076 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] [2021-05-06 11:42:46,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:42:46,076 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:46,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:46,076 INFO L82 PathProgramCache]: Analyzing trace with hash -127655584, now seen corresponding path program 5 times [2021-05-06 11:42:46,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:46,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201020403] [2021-05-06 11:42:46,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:46,078 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:46,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:46,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:46,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:46,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:46,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:46,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-06 11:42:46,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:46,272 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:46,272 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:46,272 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201020403] [2021-05-06 11:42:46,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1201020403] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:46,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:46,272 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:42:46,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189449620] [2021-05-06 11:42:46,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:42:46,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:46,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:42:46,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:42:46,273 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) [2021-05-06 11:42:47,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:47,477 INFO L93 Difference]: Finished difference Result 146 states and 188 transitions. [2021-05-06 11:42:47,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:42:47,477 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 [2021-05-06 11:42:47,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:47,478 INFO L225 Difference]: With dead ends: 146 [2021-05-06 11:42:47,478 INFO L226 Difference]: Without dead ends: 82 [2021-05-06 11:42:47,478 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 924.2ms TimeCoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:42:47,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-06 11:42:47,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-05-06 11:42:47,485 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) [2021-05-06 11:42:47,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 104 transitions. [2021-05-06 11:42:47,486 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 104 transitions. Word has length 56 [2021-05-06 11:42:47,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:47,486 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 104 transitions. [2021-05-06 11:42:47,486 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) [2021-05-06 11:42:47,486 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 104 transitions. [2021-05-06 11:42:47,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 11:42:47,486 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:47,487 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] [2021-05-06 11:42:47,487 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:42:47,487 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:47,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:47,487 INFO L82 PathProgramCache]: Analyzing trace with hash -330196214, now seen corresponding path program 6 times [2021-05-06 11:42:47,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:47,487 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [181357953] [2021-05-06 11:42:47,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:47,493 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:47,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:47,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:47,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:47,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:47,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:47,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-06 11:42:47,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:47,701 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:47,701 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:47,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [181357953] [2021-05-06 11:42:47,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [181357953] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:47,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:47,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:42:47,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416617144] [2021-05-06 11:42:47,703 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:42:47,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:47,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:42:47,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:42:47,704 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) [2021-05-06 11:42:48,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:48,925 INFO L93 Difference]: Finished difference Result 148 states and 190 transitions. [2021-05-06 11:42:48,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:42:48,926 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 [2021-05-06 11:42:48,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:48,928 INFO L225 Difference]: With dead ends: 148 [2021-05-06 11:42:48,928 INFO L226 Difference]: Without dead ends: 83 [2021-05-06 11:42:48,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 975.3ms TimeCoverageRelationStatistics Valid=124, Invalid=296, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:42:48,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-06 11:42:48,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-05-06 11:42:48,940 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) [2021-05-06 11:42:48,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 105 transitions. [2021-05-06 11:42:48,941 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 105 transitions. Word has length 58 [2021-05-06 11:42:48,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:48,942 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 105 transitions. [2021-05-06 11:42:48,942 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) [2021-05-06 11:42:48,942 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 105 transitions. [2021-05-06 11:42:48,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 11:42:48,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:48,943 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] [2021-05-06 11:42:48,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:42:48,944 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:48,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:48,944 INFO L82 PathProgramCache]: Analyzing trace with hash -1036407648, now seen corresponding path program 7 times [2021-05-06 11:42:48,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:48,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319583198] [2021-05-06 11:42:48,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:48,946 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:48,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:49,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:49,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:49,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:49,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:49,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-05-06 11:42:49,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:49,137 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:49,137 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:49,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319583198] [2021-05-06 11:42:49,137 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [319583198] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:49,137 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:49,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:42:49,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212978703] [2021-05-06 11:42:49,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:42:49,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:49,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:42:49,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:42:49,139 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) [2021-05-06 11:42:50,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:50,513 INFO L93 Difference]: Finished difference Result 150 states and 192 transitions. [2021-05-06 11:42:50,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:42:50,514 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 [2021-05-06 11:42:50,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:50,515 INFO L225 Difference]: With dead ends: 150 [2021-05-06 11:42:50,516 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 11:42:50,518 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1089.1ms TimeCoverageRelationStatistics Valid=151, Invalid=355, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:42:50,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 11:42:50,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-05-06 11:42:50,533 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) [2021-05-06 11:42:50,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 106 transitions. [2021-05-06 11:42:50,534 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 106 transitions. Word has length 60 [2021-05-06 11:42:50,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:50,534 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 106 transitions. [2021-05-06 11:42:50,534 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) [2021-05-06 11:42:50,534 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 106 transitions. [2021-05-06 11:42:50,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:42:50,538 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:50,538 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] [2021-05-06 11:42:50,538 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:42:50,538 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:50,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:50,539 INFO L82 PathProgramCache]: Analyzing trace with hash -2059623478, now seen corresponding path program 8 times [2021-05-06 11:42:50,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:50,539 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772943621] [2021-05-06 11:42:50,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:50,541 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:50,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:50,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:50,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:50,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:50,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:50,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-06 11:42:50,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:50,756 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:50,756 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:50,756 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772943621] [2021-05-06 11:42:50,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [772943621] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:50,757 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:50,757 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:42:50,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811381091] [2021-05-06 11:42:50,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:42:50,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:50,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:42:50,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:42:50,760 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) [2021-05-06 11:42:52,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:52,192 INFO L93 Difference]: Finished difference Result 152 states and 194 transitions. [2021-05-06 11:42:52,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:42:52,193 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 [2021-05-06 11:42:52,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:52,193 INFO L225 Difference]: With dead ends: 152 [2021-05-06 11:42:52,193 INFO L226 Difference]: Without dead ends: 85 [2021-05-06 11:42:52,194 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 1172.4ms TimeCoverageRelationStatistics Valid=181, Invalid=419, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:42:52,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-06 11:42:52,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-06 11:42:52,200 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) [2021-05-06 11:42:52,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 107 transitions. [2021-05-06 11:42:52,200 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 107 transitions. Word has length 62 [2021-05-06 11:42:52,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:52,200 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 107 transitions. [2021-05-06 11:42:52,201 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) [2021-05-06 11:42:52,201 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 107 transitions. [2021-05-06 11:42:52,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:42:52,201 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:52,201 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] [2021-05-06 11:42:52,201 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:42:52,201 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:52,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:52,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1482430496, now seen corresponding path program 9 times [2021-05-06 11:42:52,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:52,202 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441104442] [2021-05-06 11:42:52,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:52,203 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:52,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:52,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:52,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:52,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:52,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:52,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-05-06 11:42:52,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:52,413 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:52,414 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:52,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441104442] [2021-05-06 11:42:52,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1441104442] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:52,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:52,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:42:52,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366414329] [2021-05-06 11:42:52,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:42:52,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:52,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:42:52,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:42:52,415 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) [2021-05-06 11:42:52,925 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:42:53,856 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-06 11:42:54,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:54,097 INFO L93 Difference]: Finished difference Result 154 states and 196 transitions. [2021-05-06 11:42:54,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:42:54,098 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 [2021-05-06 11:42:54,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:54,099 INFO L225 Difference]: With dead ends: 154 [2021-05-06 11:42:54,099 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 11:42:54,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 1378.7ms TimeCoverageRelationStatistics Valid=214, Invalid=488, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:42:54,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 11:42:54,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-05-06 11:42:54,108 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) [2021-05-06 11:42:54,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 108 transitions. [2021-05-06 11:42:54,108 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 108 transitions. Word has length 64 [2021-05-06 11:42:54,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:54,109 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 108 transitions. [2021-05-06 11:42:54,109 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) [2021-05-06 11:42:54,109 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 108 transitions. [2021-05-06 11:42:54,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:42:54,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:54,109 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] [2021-05-06 11:42:54,109 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 11:42:54,109 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:54,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:54,110 INFO L82 PathProgramCache]: Analyzing trace with hash 1102249098, now seen corresponding path program 10 times [2021-05-06 11:42:54,110 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:54,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813644926] [2021-05-06 11:42:54,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:54,112 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:54,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:54,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:54,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:54,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:54,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:54,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-06 11:42:54,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:54,337 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:54,337 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:54,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813644926] [2021-05-06 11:42:54,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1813644926] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:54,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:54,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:42:54,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760577279] [2021-05-06 11:42:54,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:42:54,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:54,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:42:54,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:42:54,338 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) [2021-05-06 11:42:55,872 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-06 11:42:56,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:56,115 INFO L93 Difference]: Finished difference Result 156 states and 198 transitions. [2021-05-06 11:42:56,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:42:56,116 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 [2021-05-06 11:42:56,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:56,116 INFO L225 Difference]: With dead ends: 156 [2021-05-06 11:42:56,117 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 11:42:56,117 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 1422.1ms TimeCoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:42:56,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 11:42:56,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-06 11:42:56,123 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) [2021-05-06 11:42:56,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 109 transitions. [2021-05-06 11:42:56,124 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 109 transitions. Word has length 66 [2021-05-06 11:42:56,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:56,124 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 109 transitions. [2021-05-06 11:42:56,124 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) [2021-05-06 11:42:56,124 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 109 transitions. [2021-05-06 11:42:56,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:42:56,125 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:56,125 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] [2021-05-06 11:42:56,125 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:42:56,125 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:56,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:56,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1393110240, now seen corresponding path program 11 times [2021-05-06 11:42:56,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:56,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [248936896] [2021-05-06 11:42:56,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:56,127 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:56,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:56,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:56,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:56,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:56,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:56,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-06 11:42:56,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:56,385 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:56,385 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:56,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [248936896] [2021-05-06 11:42:56,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [248936896] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:56,386 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:56,386 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:42:56,386 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112032762] [2021-05-06 11:42:56,386 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:42:56,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:56,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:42:56,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:42:56,388 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) [2021-05-06 11:42:58,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:58,215 INFO L93 Difference]: Finished difference Result 158 states and 200 transitions. [2021-05-06 11:42:58,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:42:58,216 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 [2021-05-06 11:42:58,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:58,217 INFO L225 Difference]: With dead ends: 158 [2021-05-06 11:42:58,217 INFO L226 Difference]: Without dead ends: 88 [2021-05-06 11:42:58,217 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1542.0ms TimeCoverageRelationStatistics Valid=289, Invalid=641, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:42:58,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-06 11:42:58,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-05-06 11:42:58,224 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) [2021-05-06 11:42:58,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 110 transitions. [2021-05-06 11:42:58,224 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 110 transitions. Word has length 68 [2021-05-06 11:42:58,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:58,224 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 110 transitions. [2021-05-06 11:42:58,224 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) [2021-05-06 11:42:58,224 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 110 transitions. [2021-05-06 11:42:58,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 11:42:58,225 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:58,225 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] [2021-05-06 11:42:58,225 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-06 11:42:58,225 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:58,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:58,225 INFO L82 PathProgramCache]: Analyzing trace with hash 1390454090, now seen corresponding path program 12 times [2021-05-06 11:42:58,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:58,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227441383] [2021-05-06 11:42:58,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:58,227 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:58,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:58,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:58,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:58,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:42:58,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:58,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-05-06 11:42:58,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:58,490 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:42:58,490 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:58,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227441383] [2021-05-06 11:42:58,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1227441383] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:58,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:58,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:42:58,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982751902] [2021-05-06 11:42:58,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:42:58,491 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:58,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:42:58,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:42:58,491 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) [2021-05-06 11:43:00,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:00,434 INFO L93 Difference]: Finished difference Result 160 states and 202 transitions. [2021-05-06 11:43:00,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:43:00,434 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 [2021-05-06 11:43:00,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:00,435 INFO L225 Difference]: With dead ends: 160 [2021-05-06 11:43:00,435 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 11:43:00,436 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1685.3ms TimeCoverageRelationStatistics Valid=331, Invalid=725, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:43:00,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 11:43:00,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-05-06 11:43:00,442 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) [2021-05-06 11:43:00,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 111 transitions. [2021-05-06 11:43:00,443 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 111 transitions. Word has length 70 [2021-05-06 11:43:00,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:00,443 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 111 transitions. [2021-05-06 11:43:00,443 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) [2021-05-06 11:43:00,443 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 111 transitions. [2021-05-06 11:43:00,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:43:00,444 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:00,444 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] [2021-05-06 11:43:00,444 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:43:00,444 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:00,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:00,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1316589984, now seen corresponding path program 13 times [2021-05-06 11:43:00,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:00,444 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1211795482] [2021-05-06 11:43:00,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:00,449 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:00,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:00,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:00,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:00,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:00,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:00,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-06 11:43:00,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:00,731 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:00,731 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:00,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1211795482] [2021-05-06 11:43:00,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1211795482] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:00,731 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:00,731 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:43:00,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820567000] [2021-05-06 11:43:00,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:43:00,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:00,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:43:00,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:43:00,732 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) [2021-05-06 11:43:02,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:02,867 INFO L93 Difference]: Finished difference Result 162 states and 204 transitions. [2021-05-06 11:43:02,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:43:02,867 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 [2021-05-06 11:43:02,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:02,868 INFO L225 Difference]: With dead ends: 162 [2021-05-06 11:43:02,868 INFO L226 Difference]: Without dead ends: 90 [2021-05-06 11:43:02,868 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1796.8ms TimeCoverageRelationStatistics Valid=376, Invalid=814, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:43:02,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-06 11:43:02,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-05-06 11:43:02,875 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) [2021-05-06 11:43:02,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 112 transitions. [2021-05-06 11:43:02,875 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 112 transitions. Word has length 72 [2021-05-06 11:43:02,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:02,876 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 112 transitions. [2021-05-06 11:43:02,876 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) [2021-05-06 11:43:02,876 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 112 transitions. [2021-05-06 11:43:02,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:43:02,876 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:02,876 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] [2021-05-06 11:43:02,876 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:43:02,876 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:02,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:02,877 INFO L82 PathProgramCache]: Analyzing trace with hash -286155254, now seen corresponding path program 14 times [2021-05-06 11:43:02,877 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:02,877 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497211974] [2021-05-06 11:43:02,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:02,878 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:02,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:02,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:02,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:02,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:03,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:03,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-06 11:43:03,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:03,158 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:03,159 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:03,159 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1497211974] [2021-05-06 11:43:03,159 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1497211974] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:03,159 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:03,159 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:43:03,159 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046196633] [2021-05-06 11:43:03,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:43:03,159 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:03,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:43:03,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:43:03,160 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) [2021-05-06 11:43:05,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:05,223 INFO L93 Difference]: Finished difference Result 164 states and 206 transitions. [2021-05-06 11:43:05,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:43:05,224 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 [2021-05-06 11:43:05,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:05,224 INFO L225 Difference]: With dead ends: 164 [2021-05-06 11:43:05,224 INFO L226 Difference]: Without dead ends: 91 [2021-05-06 11:43:05,225 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 1905.2ms TimeCoverageRelationStatistics Valid=424, Invalid=908, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:43:05,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-06 11:43:05,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-05-06 11:43:05,231 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) [2021-05-06 11:43:05,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 113 transitions. [2021-05-06 11:43:05,232 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 113 transitions. Word has length 74 [2021-05-06 11:43:05,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:05,232 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 113 transitions. [2021-05-06 11:43:05,232 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) [2021-05-06 11:43:05,232 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 113 transitions. [2021-05-06 11:43:05,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 11:43:05,233 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:05,233 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] [2021-05-06 11:43:05,233 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 11:43:05,233 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:05,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:05,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1348028000, now seen corresponding path program 15 times [2021-05-06 11:43:05,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:05,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849205417] [2021-05-06 11:43:05,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:05,235 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:05,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:05,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:05,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:05,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:05,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:05,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-06 11:43:05,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:05,534 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:05,534 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:05,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849205417] [2021-05-06 11:43:05,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1849205417] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:05,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:05,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:43:05,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686423386] [2021-05-06 11:43:05,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:43:05,535 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:05,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:43:05,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:43:05,535 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) [2021-05-06 11:43:07,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:07,675 INFO L93 Difference]: Finished difference Result 166 states and 208 transitions. [2021-05-06 11:43:07,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:43:07,676 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 [2021-05-06 11:43:07,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:07,677 INFO L225 Difference]: With dead ends: 166 [2021-05-06 11:43:07,677 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 11:43:07,679 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 2004.7ms TimeCoverageRelationStatistics Valid=475, Invalid=1007, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:43:07,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 11:43:07,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-05-06 11:43:07,686 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) [2021-05-06 11:43:07,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 114 transitions. [2021-05-06 11:43:07,687 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 114 transitions. Word has length 76 [2021-05-06 11:43:07,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:07,687 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 114 transitions. [2021-05-06 11:43:07,687 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) [2021-05-06 11:43:07,687 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 114 transitions. [2021-05-06 11:43:07,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-06 11:43:07,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:07,688 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] [2021-05-06 11:43:07,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 11:43:07,688 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:07,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:07,688 INFO L82 PathProgramCache]: Analyzing trace with hash 286385866, now seen corresponding path program 16 times [2021-05-06 11:43:07,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:07,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1286825149] [2021-05-06 11:43:07,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:07,690 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:07,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:07,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:07,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:07,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:07,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:07,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-06 11:43:07,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:07,989 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:07,989 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:07,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1286825149] [2021-05-06 11:43:07,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1286825149] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:07,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:07,989 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:43:07,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823162001] [2021-05-06 11:43:07,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:43:07,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:07,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:43:07,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:43:07,990 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) [2021-05-06 11:43:10,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:10,400 INFO L93 Difference]: Finished difference Result 168 states and 210 transitions. [2021-05-06 11:43:10,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:43:10,401 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 [2021-05-06 11:43:10,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:10,402 INFO L225 Difference]: With dead ends: 168 [2021-05-06 11:43:10,402 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 11:43:10,402 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 2119.2ms TimeCoverageRelationStatistics Valid=529, Invalid=1111, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:43:10,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 11:43:10,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-06 11:43:10,409 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) [2021-05-06 11:43:10,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 115 transitions. [2021-05-06 11:43:10,410 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 115 transitions. Word has length 78 [2021-05-06 11:43:10,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:10,410 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 115 transitions. [2021-05-06 11:43:10,410 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) [2021-05-06 11:43:10,410 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 115 transitions. [2021-05-06 11:43:10,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 11:43:10,410 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:10,410 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] [2021-05-06 11:43:10,410 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:43:10,410 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:10,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:10,411 INFO L82 PathProgramCache]: Analyzing trace with hash -55855904, now seen corresponding path program 17 times [2021-05-06 11:43:10,411 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:10,411 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85680932] [2021-05-06 11:43:10,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:10,412 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:10,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:10,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:10,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:10,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:10,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:10,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-06 11:43:10,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:10,717 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:10,717 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:10,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85680932] [2021-05-06 11:43:10,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [85680932] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:10,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:10,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:43:10,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570652543] [2021-05-06 11:43:10,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:43:10,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:10,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:43:10,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:43:10,719 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) [2021-05-06 11:43:13,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:13,121 INFO L93 Difference]: Finished difference Result 170 states and 212 transitions. [2021-05-06 11:43:13,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:43:13,121 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 [2021-05-06 11:43:13,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:13,122 INFO L225 Difference]: With dead ends: 170 [2021-05-06 11:43:13,122 INFO L226 Difference]: Without dead ends: 94 [2021-05-06 11:43:13,123 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 2246.1ms TimeCoverageRelationStatistics Valid=586, Invalid=1220, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:43:13,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-06 11:43:13,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-05-06 11:43:13,130 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) [2021-05-06 11:43:13,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 116 transitions. [2021-05-06 11:43:13,130 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 116 transitions. Word has length 80 [2021-05-06 11:43:13,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:13,130 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 116 transitions. [2021-05-06 11:43:13,130 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) [2021-05-06 11:43:13,130 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 116 transitions. [2021-05-06 11:43:13,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 11:43:13,131 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:13,131 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] [2021-05-06 11:43:13,131 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-06 11:43:13,131 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:13,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:13,131 INFO L82 PathProgramCache]: Analyzing trace with hash 963477386, now seen corresponding path program 18 times [2021-05-06 11:43:13,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:13,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1384331250] [2021-05-06 11:43:13,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:13,133 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:13,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:13,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:13,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:13,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:13,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:13,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-06 11:43:13,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:13,497 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:13,497 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:13,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1384331250] [2021-05-06 11:43:13,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1384331250] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:13,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:13,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:43:13,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101832134] [2021-05-06 11:43:13,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:43:13,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:13,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:43:13,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:43:13,498 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) [2021-05-06 11:43:15,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:15,985 INFO L93 Difference]: Finished difference Result 172 states and 214 transitions. [2021-05-06 11:43:15,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:43:15,985 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 [2021-05-06 11:43:15,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:15,986 INFO L225 Difference]: With dead ends: 172 [2021-05-06 11:43:15,986 INFO L226 Difference]: Without dead ends: 95 [2021-05-06 11:43:15,986 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 2443.0ms TimeCoverageRelationStatistics Valid=646, Invalid=1334, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:43:15,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-06 11:43:15,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-05-06 11:43:15,994 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) [2021-05-06 11:43:15,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 117 transitions. [2021-05-06 11:43:15,994 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 117 transitions. Word has length 82 [2021-05-06 11:43:15,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:15,994 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 117 transitions. [2021-05-06 11:43:15,994 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) [2021-05-06 11:43:15,995 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 117 transitions. [2021-05-06 11:43:15,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-05-06 11:43:15,995 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:15,995 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] [2021-05-06 11:43:15,995 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:43:15,995 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:15,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:15,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1997971424, now seen corresponding path program 19 times [2021-05-06 11:43:15,995 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:15,996 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85151128] [2021-05-06 11:43:15,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:15,997 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:16,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:16,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:16,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:16,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:16,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:16,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-06 11:43:16,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:16,365 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:16,366 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:16,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85151128] [2021-05-06 11:43:16,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [85151128] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:16,366 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:16,366 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:43:16,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358707606] [2021-05-06 11:43:16,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:43:16,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:16,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:43:16,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:43:16,367 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) [2021-05-06 11:43:19,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:19,218 INFO L93 Difference]: Finished difference Result 174 states and 216 transitions. [2021-05-06 11:43:19,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:43:19,219 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 [2021-05-06 11:43:19,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:19,220 INFO L225 Difference]: With dead ends: 174 [2021-05-06 11:43:19,220 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 11:43:19,220 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 2566.8ms TimeCoverageRelationStatistics Valid=709, Invalid=1453, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:43:19,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 11:43:19,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-05-06 11:43:19,228 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) [2021-05-06 11:43:19,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 118 transitions. [2021-05-06 11:43:19,228 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 118 transitions. Word has length 84 [2021-05-06 11:43:19,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:19,228 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 118 transitions. [2021-05-06 11:43:19,228 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) [2021-05-06 11:43:19,228 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 118 transitions. [2021-05-06 11:43:19,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 11:43:19,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:19,229 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] [2021-05-06 11:43:19,229 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:43:19,229 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:19,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:19,229 INFO L82 PathProgramCache]: Analyzing trace with hash 758147146, now seen corresponding path program 20 times [2021-05-06 11:43:19,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:19,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909825556] [2021-05-06 11:43:19,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:19,231 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:19,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:19,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:19,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:19,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:19,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:19,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-05-06 11:43:19,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:19,652 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:19,652 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:19,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [909825556] [2021-05-06 11:43:19,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [909825556] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:19,652 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:19,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:43:19,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203481872] [2021-05-06 11:43:19,652 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:43:19,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:19,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:43:19,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:43:19,653 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) [2021-05-06 11:43:22,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:22,365 INFO L93 Difference]: Finished difference Result 176 states and 218 transitions. [2021-05-06 11:43:22,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:43:22,366 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 [2021-05-06 11:43:22,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:22,367 INFO L225 Difference]: With dead ends: 176 [2021-05-06 11:43:22,367 INFO L226 Difference]: Without dead ends: 97 [2021-05-06 11:43:22,368 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 2700.3ms TimeCoverageRelationStatistics Valid=775, Invalid=1577, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:43:22,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-06 11:43:22,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-05-06 11:43:22,375 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) [2021-05-06 11:43:22,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 119 transitions. [2021-05-06 11:43:22,376 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 119 transitions. Word has length 86 [2021-05-06 11:43:22,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:22,376 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 119 transitions. [2021-05-06 11:43:22,376 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) [2021-05-06 11:43:22,376 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 119 transitions. [2021-05-06 11:43:22,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 11:43:22,376 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:22,376 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] [2021-05-06 11:43:22,376 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 11:43:22,376 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:22,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:22,377 INFO L82 PathProgramCache]: Analyzing trace with hash 531872608, now seen corresponding path program 21 times [2021-05-06 11:43:22,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:22,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569788219] [2021-05-06 11:43:22,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:22,378 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:22,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:22,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:22,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:22,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:22,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:22,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-06 11:43:22,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:22,776 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:22,777 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:22,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569788219] [2021-05-06 11:43:22,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1569788219] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:22,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:22,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:43:22,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540691400] [2021-05-06 11:43:22,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:43:22,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:22,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:43:22,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:43:22,778 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) [2021-05-06 11:43:26,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:26,150 INFO L93 Difference]: Finished difference Result 178 states and 220 transitions. [2021-05-06 11:43:26,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:43:26,150 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 [2021-05-06 11:43:26,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:26,152 INFO L225 Difference]: With dead ends: 178 [2021-05-06 11:43:26,152 INFO L226 Difference]: Without dead ends: 98 [2021-05-06 11:43:26,152 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 2799.4ms TimeCoverageRelationStatistics Valid=844, Invalid=1706, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:43:26,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-06 11:43:26,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-05-06 11:43:26,160 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) [2021-05-06 11:43:26,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 120 transitions. [2021-05-06 11:43:26,161 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 120 transitions. Word has length 88 [2021-05-06 11:43:26,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:26,161 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 120 transitions. [2021-05-06 11:43:26,161 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) [2021-05-06 11:43:26,161 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 120 transitions. [2021-05-06 11:43:26,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-05-06 11:43:26,161 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:26,162 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] [2021-05-06 11:43:26,162 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 11:43:26,162 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:26,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:26,162 INFO L82 PathProgramCache]: Analyzing trace with hash -1232690934, now seen corresponding path program 22 times [2021-05-06 11:43:26,162 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:26,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223447643] [2021-05-06 11:43:26,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:26,163 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:26,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:26,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:26,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:26,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:26,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:26,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-06 11:43:26,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:26,578 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:26,578 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:26,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223447643] [2021-05-06 11:43:26,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1223447643] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:26,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:26,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:43:26,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85674361] [2021-05-06 11:43:26,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:43:26,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:26,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:43:26,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:43:26,579 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) [2021-05-06 11:43:29,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:29,967 INFO L93 Difference]: Finished difference Result 180 states and 222 transitions. [2021-05-06 11:43:29,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:43:29,968 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 [2021-05-06 11:43:29,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:29,968 INFO L225 Difference]: With dead ends: 180 [2021-05-06 11:43:29,968 INFO L226 Difference]: Without dead ends: 99 [2021-05-06 11:43:29,969 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 2936.1ms TimeCoverageRelationStatistics Valid=916, Invalid=1840, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:43:29,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-06 11:43:29,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-06 11:43:29,977 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) [2021-05-06 11:43:29,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 121 transitions. [2021-05-06 11:43:29,977 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 121 transitions. Word has length 90 [2021-05-06 11:43:29,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:29,977 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 121 transitions. [2021-05-06 11:43:29,977 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) [2021-05-06 11:43:29,978 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 121 transitions. [2021-05-06 11:43:29,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-06 11:43:29,978 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:29,978 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] [2021-05-06 11:43:29,978 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:43:29,978 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:29,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:29,978 INFO L82 PathProgramCache]: Analyzing trace with hash -1486960992, now seen corresponding path program 23 times [2021-05-06 11:43:29,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:29,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1877216697] [2021-05-06 11:43:29,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:29,980 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:29,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:30,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:30,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:30,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:30,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:30,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-05-06 11:43:30,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:30,438 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:30,439 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:30,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1877216697] [2021-05-06 11:43:30,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1877216697] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:30,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:30,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:43:30,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989709720] [2021-05-06 11:43:30,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:43:30,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:30,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:43:30,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:43:30,440 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) [2021-05-06 11:43:33,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:33,849 INFO L93 Difference]: Finished difference Result 182 states and 224 transitions. [2021-05-06 11:43:33,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:43:33,850 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 [2021-05-06 11:43:33,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:33,850 INFO L225 Difference]: With dead ends: 182 [2021-05-06 11:43:33,851 INFO L226 Difference]: Without dead ends: 100 [2021-05-06 11:43:33,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 3096.4ms TimeCoverageRelationStatistics Valid=991, Invalid=1979, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:43:33,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-06 11:43:33,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-05-06 11:43:33,859 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) [2021-05-06 11:43:33,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 122 transitions. [2021-05-06 11:43:33,859 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 122 transitions. Word has length 92 [2021-05-06 11:43:33,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:33,860 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 122 transitions. [2021-05-06 11:43:33,860 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) [2021-05-06 11:43:33,860 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 122 transitions. [2021-05-06 11:43:33,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 11:43:33,860 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:33,860 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] [2021-05-06 11:43:33,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 11:43:33,860 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:33,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:33,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1687955914, now seen corresponding path program 24 times [2021-05-06 11:43:33,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:33,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994747260] [2021-05-06 11:43:33,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:33,862 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:33,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:33,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:33,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:33,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:33,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:33,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:43:33,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:34,332 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 11:43:34,332 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:34,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994747260] [2021-05-06 11:43:34,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [994747260] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:34,332 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:34,332 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:43:34,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301288665] [2021-05-06 11:43:34,333 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:43:34,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:34,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:43:34,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:43:34,333 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) [2021-05-06 11:43:40,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:40,929 INFO L93 Difference]: Finished difference Result 184 states and 218 transitions. [2021-05-06 11:43:40,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 11:43:40,930 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 [2021-05-06 11:43:40,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:40,930 INFO L225 Difference]: With dead ends: 184 [2021-05-06 11:43:40,930 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 11:43:40,932 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1346 ImplicationChecksByTransitivity, 6242.2ms TimeCoverageRelationStatistics Valid=2122, Invalid=4520, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:43:40,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 11:43:40,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-05-06 11:43:40,944 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) [2021-05-06 11:43:40,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 152 transitions. [2021-05-06 11:43:40,945 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 152 transitions. Word has length 94 [2021-05-06 11:43:40,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:40,945 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 152 transitions. [2021-05-06 11:43:40,945 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) [2021-05-06 11:43:40,945 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 152 transitions. [2021-05-06 11:43:40,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:43:40,946 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:40,946 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] [2021-05-06 11:43:40,946 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:43:40,946 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:40,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:40,946 INFO L82 PathProgramCache]: Analyzing trace with hash 207333048, now seen corresponding path program 25 times [2021-05-06 11:43:40,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:40,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380647613] [2021-05-06 11:43:40,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:40,948 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:40,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:41,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:41,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:41,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:41,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:41,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:43:41,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:41,413 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:41,413 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:41,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380647613] [2021-05-06 11:43:41,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1380647613] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:41,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:41,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:43:41,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60624292] [2021-05-06 11:43:41,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:43:41,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:41,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:43:41,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:43:41,414 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) [2021-05-06 11:43:44,905 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:43:49,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:49,176 INFO L93 Difference]: Finished difference Result 193 states and 228 transitions. [2021-05-06 11:43:49,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-06 11:43:49,176 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 [2021-05-06 11:43:49,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:49,177 INFO L225 Difference]: With dead ends: 193 [2021-05-06 11:43:49,177 INFO L226 Difference]: Without dead ends: 133 [2021-05-06 11:43:49,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1452 ImplicationChecksByTransitivity, 6564.8ms TimeCoverageRelationStatistics Valid=2284, Invalid=4856, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:43:49,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-06 11:43:49,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 130. [2021-05-06 11:43:49,192 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) [2021-05-06 11:43:49,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 153 transitions. [2021-05-06 11:43:49,193 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 153 transitions. Word has length 95 [2021-05-06 11:43:49,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:49,193 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 153 transitions. [2021-05-06 11:43:49,193 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) [2021-05-06 11:43:49,193 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 153 transitions. [2021-05-06 11:43:49,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-05-06 11:43:49,194 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:49,194 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] [2021-05-06 11:43:49,194 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:43:49,194 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:49,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:49,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1552664458, now seen corresponding path program 26 times [2021-05-06 11:43:49,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:49,194 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156993520] [2021-05-06 11:43:49,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:49,196 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:49,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:49,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:49,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:49,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:49,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:49,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:43:49,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:49,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:49,703 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:49,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156993520] [2021-05-06 11:43:49,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [156993520] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:49,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:49,704 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:43:49,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911255609] [2021-05-06 11:43:49,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:43:49,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:49,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:43:49,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:43:49,704 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) [2021-05-06 11:43:57,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:57,556 INFO L93 Difference]: Finished difference Result 198 states and 234 transitions. [2021-05-06 11:43:57,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-06 11:43:57,556 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 [2021-05-06 11:43:57,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:57,557 INFO L225 Difference]: With dead ends: 198 [2021-05-06 11:43:57,557 INFO L226 Difference]: Without dead ends: 137 [2021-05-06 11:43:57,558 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1562 ImplicationChecksByTransitivity, 6847.5ms TimeCoverageRelationStatistics Valid=2452, Invalid=5204, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:43:57,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-06 11:43:57,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 131. [2021-05-06 11:43:57,571 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) [2021-05-06 11:43:57,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 154 transitions. [2021-05-06 11:43:57,572 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 154 transitions. Word has length 96 [2021-05-06 11:43:57,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:57,572 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 154 transitions. [2021-05-06 11:43:57,572 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) [2021-05-06 11:43:57,572 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 154 transitions. [2021-05-06 11:43:57,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 11:43:57,572 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:57,573 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] [2021-05-06 11:43:57,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-06 11:43:57,573 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:57,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:57,573 INFO L82 PathProgramCache]: Analyzing trace with hash 308265208, now seen corresponding path program 27 times [2021-05-06 11:43:57,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:57,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1042420191] [2021-05-06 11:43:57,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:57,574 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:43:57,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:57,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:57,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:57,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:43:57,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:57,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:43:57,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:58,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:58,104 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:58,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1042420191] [2021-05-06 11:43:58,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1042420191] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:58,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:58,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:43:58,105 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084648184] [2021-05-06 11:43:58,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:43:58,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:58,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:43:58,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:43:58,105 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) [2021-05-06 11:44:07,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:07,042 INFO L93 Difference]: Finished difference Result 203 states and 240 transitions. [2021-05-06 11:44:07,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 11:44:07,048 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 [2021-05-06 11:44:07,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:07,049 INFO L225 Difference]: With dead ends: 203 [2021-05-06 11:44:07,049 INFO L226 Difference]: Without dead ends: 141 [2021-05-06 11:44:07,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1676 ImplicationChecksByTransitivity, 7262.8ms TimeCoverageRelationStatistics Valid=2626, Invalid=5564, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 11:44:07,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-06 11:44:07,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 132. [2021-05-06 11:44:07,064 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) [2021-05-06 11:44:07,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 155 transitions. [2021-05-06 11:44:07,064 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 155 transitions. Word has length 97 [2021-05-06 11:44:07,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:07,065 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 155 transitions. [2021-05-06 11:44:07,065 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) [2021-05-06 11:44:07,065 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 155 transitions. [2021-05-06 11:44:07,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 11:44:07,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:07,065 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] [2021-05-06 11:44:07,065 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 11:44:07,065 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:07,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:07,066 INFO L82 PathProgramCache]: Analyzing trace with hash 386594122, now seen corresponding path program 28 times [2021-05-06 11:44:07,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:07,066 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621299230] [2021-05-06 11:44:07,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:07,067 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:44:07,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:07,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:07,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:07,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:44:07,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:07,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:44:07,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:07,617 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:07,617 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:07,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621299230] [2021-05-06 11:44:07,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [621299230] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:07,617 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:07,617 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:44:07,617 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961698535] [2021-05-06 11:44:07,618 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:44:07,618 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:07,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:44:07,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:44:07,618 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) [2021-05-06 11:44:17,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:17,053 INFO L93 Difference]: Finished difference Result 208 states and 246 transitions. [2021-05-06 11:44:17,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-06 11:44:17,054 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 [2021-05-06 11:44:17,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:17,054 INFO L225 Difference]: With dead ends: 208 [2021-05-06 11:44:17,054 INFO L226 Difference]: Without dead ends: 145 [2021-05-06 11:44:17,056 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1794 ImplicationChecksByTransitivity, 7538.0ms TimeCoverageRelationStatistics Valid=2806, Invalid=5936, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:44:17,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-05-06 11:44:17,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 133. [2021-05-06 11:44:17,072 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) [2021-05-06 11:44:17,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 156 transitions. [2021-05-06 11:44:17,073 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 156 transitions. Word has length 98 [2021-05-06 11:44:17,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:17,073 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 156 transitions. [2021-05-06 11:44:17,073 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) [2021-05-06 11:44:17,073 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 156 transitions. [2021-05-06 11:44:17,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 11:44:17,073 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:17,074 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] [2021-05-06 11:44:17,074 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:44:17,074 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:17,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:17,074 INFO L82 PathProgramCache]: Analyzing trace with hash -1480176840, now seen corresponding path program 29 times [2021-05-06 11:44:17,074 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:17,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155224510] [2021-05-06 11:44:17,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:17,077 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:44:17,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:17,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:17,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:17,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:44:17,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:17,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:44:17,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:17,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:17,634 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:17,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155224510] [2021-05-06 11:44:17,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1155224510] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:17,634 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:17,634 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:44:17,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257945835] [2021-05-06 11:44:17,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:44:17,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:17,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:44:17,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:44:17,635 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) [2021-05-06 11:44:27,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:27,830 INFO L93 Difference]: Finished difference Result 213 states and 252 transitions. [2021-05-06 11:44:27,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-06 11:44:27,831 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 [2021-05-06 11:44:27,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:27,831 INFO L225 Difference]: With dead ends: 213 [2021-05-06 11:44:27,831 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 11:44:27,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1916 ImplicationChecksByTransitivity, 7792.2ms TimeCoverageRelationStatistics Valid=2992, Invalid=6320, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 11:44:27,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 11:44:27,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 134. [2021-05-06 11:44:27,846 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) [2021-05-06 11:44:27,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 157 transitions. [2021-05-06 11:44:27,847 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 157 transitions. Word has length 99 [2021-05-06 11:44:27,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:27,847 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 157 transitions. [2021-05-06 11:44:27,847 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) [2021-05-06 11:44:27,847 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 157 transitions. [2021-05-06 11:44:27,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-06 11:44:27,847 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:27,847 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] [2021-05-06 11:44:27,848 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-06 11:44:27,848 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:27,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:27,848 INFO L82 PathProgramCache]: Analyzing trace with hash 779465482, now seen corresponding path program 30 times [2021-05-06 11:44:27,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:27,848 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55384672] [2021-05-06 11:44:27,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:27,849 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:44:27,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:27,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:27,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:27,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:44:27,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:27,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:44:27,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:28,449 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:28,449 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:28,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [55384672] [2021-05-06 11:44:28,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [55384672] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:28,449 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:28,449 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:44:28,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543190190] [2021-05-06 11:44:28,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:44:28,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:28,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:44:28,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:44:28,450 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) [2021-05-06 11:44:36,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:36,875 INFO L93 Difference]: Finished difference Result 218 states and 258 transitions. [2021-05-06 11:44:36,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-06 11:44:36,876 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 [2021-05-06 11:44:36,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:36,876 INFO L225 Difference]: With dead ends: 218 [2021-05-06 11:44:36,877 INFO L226 Difference]: Without dead ends: 153 [2021-05-06 11:44:36,877 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2042 ImplicationChecksByTransitivity, 8164.6ms TimeCoverageRelationStatistics Valid=3184, Invalid=6716, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:44:36,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-05-06 11:44:36,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 135. [2021-05-06 11:44:36,893 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) [2021-05-06 11:44:36,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 158 transitions. [2021-05-06 11:44:36,893 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 158 transitions. Word has length 100 [2021-05-06 11:44:36,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:36,893 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 158 transitions. [2021-05-06 11:44:36,893 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) [2021-05-06 11:44:36,893 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 158 transitions. [2021-05-06 11:44:36,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:44:36,894 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:36,894 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] [2021-05-06 11:44:36,894 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 11:44:36,894 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:36,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:36,894 INFO L82 PathProgramCache]: Analyzing trace with hash 2108900728, now seen corresponding path program 31 times [2021-05-06 11:44:36,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:36,894 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153786962] [2021-05-06 11:44:36,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:36,896 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:44:36,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:37,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:37,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:37,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:44:37,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:37,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:44:37,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:37,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:37,519 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:37,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153786962] [2021-05-06 11:44:37,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1153786962] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:37,519 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:37,519 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 11:44:37,519 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202541398] [2021-05-06 11:44:37,519 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 11:44:37,519 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:37,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 11:44:37,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:44:37,520 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) [2021-05-06 11:44:47,158 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:44:48,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:48,884 INFO L93 Difference]: Finished difference Result 223 states and 264 transitions. [2021-05-06 11:44:48,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-06 11:44:48,885 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 [2021-05-06 11:44:48,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:48,886 INFO L225 Difference]: With dead ends: 223 [2021-05-06 11:44:48,886 INFO L226 Difference]: Without dead ends: 157 [2021-05-06 11:44:48,887 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2172 ImplicationChecksByTransitivity, 8527.5ms TimeCoverageRelationStatistics Valid=3382, Invalid=7124, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 11:44:48,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-06 11:44:48,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 136. [2021-05-06 11:44:48,902 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) [2021-05-06 11:44:48,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 159 transitions. [2021-05-06 11:44:48,903 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 159 transitions. Word has length 101 [2021-05-06 11:44:48,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:48,903 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 159 transitions. [2021-05-06 11:44:48,903 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) [2021-05-06 11:44:48,903 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 159 transitions. [2021-05-06 11:44:48,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:44:48,903 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:48,904 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] [2021-05-06 11:44:48,904 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:44:48,904 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:48,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:48,904 INFO L82 PathProgramCache]: Analyzing trace with hash 371720394, now seen corresponding path program 32 times [2021-05-06 11:44:48,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:48,904 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857957270] [2021-05-06 11:44:48,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:48,905 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:44:48,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:49,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:49,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:49,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:44:49,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:49,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:44:49,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:49,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:49,555 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:49,555 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857957270] [2021-05-06 11:44:49,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1857957270] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:49,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:49,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:44:49,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161034349] [2021-05-06 11:44:49,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:44:49,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:49,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:44:49,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:44:49,556 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) [2021-05-06 11:44:52,936 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:45:01,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:01,209 INFO L93 Difference]: Finished difference Result 228 states and 270 transitions. [2021-05-06 11:45:01,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-06 11:45:01,209 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 [2021-05-06 11:45:01,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:01,210 INFO L225 Difference]: With dead ends: 228 [2021-05-06 11:45:01,210 INFO L226 Difference]: Without dead ends: 161 [2021-05-06 11:45:01,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2306 ImplicationChecksByTransitivity, 8870.5ms TimeCoverageRelationStatistics Valid=3586, Invalid=7544, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 11:45:01,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-06 11:45:01,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 137. [2021-05-06 11:45:01,227 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) [2021-05-06 11:45:01,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 160 transitions. [2021-05-06 11:45:01,227 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 160 transitions. Word has length 102 [2021-05-06 11:45:01,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:01,228 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 160 transitions. [2021-05-06 11:45:01,228 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) [2021-05-06 11:45:01,228 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 160 transitions. [2021-05-06 11:45:01,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 11:45:01,228 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:01,228 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] [2021-05-06 11:45:01,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 11:45:01,228 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:01,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:01,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1941262408, now seen corresponding path program 33 times [2021-05-06 11:45:01,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:01,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350753715] [2021-05-06 11:45:01,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:01,230 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:45:01,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:01,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:01,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:01,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:45:01,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:01,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:45:01,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:01,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:01,956 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:01,956 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350753715] [2021-05-06 11:45:01,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1350753715] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:01,956 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:01,956 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:45:01,957 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886110457] [2021-05-06 11:45:01,957 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:45:01,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:01,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:45:01,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:45:01,957 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) [2021-05-06 11:45:14,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:14,374 INFO L93 Difference]: Finished difference Result 233 states and 276 transitions. [2021-05-06 11:45:14,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-06 11:45:14,374 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 [2021-05-06 11:45:14,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:14,375 INFO L225 Difference]: With dead ends: 233 [2021-05-06 11:45:14,375 INFO L226 Difference]: Without dead ends: 165 [2021-05-06 11:45:14,376 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2444 ImplicationChecksByTransitivity, 9267.4ms TimeCoverageRelationStatistics Valid=3796, Invalid=7976, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 11:45:14,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-05-06 11:45:14,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 138. [2021-05-06 11:45:14,392 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) [2021-05-06 11:45:14,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 161 transitions. [2021-05-06 11:45:14,393 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 161 transitions. Word has length 103 [2021-05-06 11:45:14,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:14,393 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 161 transitions. [2021-05-06 11:45:14,393 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) [2021-05-06 11:45:14,393 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 161 transitions. [2021-05-06 11:45:14,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 11:45:14,394 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:14,394 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] [2021-05-06 11:45:14,394 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 11:45:14,394 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:14,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:14,394 INFO L82 PathProgramCache]: Analyzing trace with hash -629285238, now seen corresponding path program 34 times [2021-05-06 11:45:14,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:14,394 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306048522] [2021-05-06 11:45:14,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:14,396 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:45:14,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:14,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:14,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:14,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:45:14,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:14,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:45:14,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:15,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:15,142 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:15,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1306048522] [2021-05-06 11:45:15,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1306048522] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:15,142 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:15,142 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 11:45:15,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15716824] [2021-05-06 11:45:15,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 11:45:15,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:15,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 11:45:15,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:45:15,143 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) [2021-05-06 11:45:27,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:27,009 INFO L93 Difference]: Finished difference Result 238 states and 282 transitions. [2021-05-06 11:45:27,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 11:45:27,010 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 [2021-05-06 11:45:27,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:27,010 INFO L225 Difference]: With dead ends: 238 [2021-05-06 11:45:27,010 INFO L226 Difference]: Without dead ends: 169 [2021-05-06 11:45:27,011 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2586 ImplicationChecksByTransitivity, 9597.9ms TimeCoverageRelationStatistics Valid=4012, Invalid=8420, Unknown=0, NotChecked=0, Total=12432 [2021-05-06 11:45:27,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-06 11:45:27,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 139. [2021-05-06 11:45:27,029 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) [2021-05-06 11:45:27,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 162 transitions. [2021-05-06 11:45:27,029 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 162 transitions. Word has length 104 [2021-05-06 11:45:27,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:27,029 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 162 transitions. [2021-05-06 11:45:27,029 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) [2021-05-06 11:45:27,029 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 162 transitions. [2021-05-06 11:45:27,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-06 11:45:27,030 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:27,030 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] [2021-05-06 11:45:27,030 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:45:27,030 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:27,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:27,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1387301368, now seen corresponding path program 35 times [2021-05-06 11:45:27,030 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:27,030 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437219688] [2021-05-06 11:45:27,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:27,031 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:45:27,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:27,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:27,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:27,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:45:27,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:27,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:45:27,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:27,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:27,747 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:27,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437219688] [2021-05-06 11:45:27,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [437219688] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:27,747 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:27,747 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:45:27,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072570936] [2021-05-06 11:45:27,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:45:27,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:27,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:45:27,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:45:27,748 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) [2021-05-06 11:45:38,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:38,491 INFO L93 Difference]: Finished difference Result 243 states and 288 transitions. [2021-05-06 11:45:38,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-06 11:45:38,491 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 [2021-05-06 11:45:38,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:38,492 INFO L225 Difference]: With dead ends: 243 [2021-05-06 11:45:38,492 INFO L226 Difference]: Without dead ends: 173 [2021-05-06 11:45:38,493 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2732 ImplicationChecksByTransitivity, 9860.2ms TimeCoverageRelationStatistics Valid=4234, Invalid=8876, Unknown=0, NotChecked=0, Total=13110 [2021-05-06 11:45:38,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-06 11:45:38,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 140. [2021-05-06 11:45:38,512 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) [2021-05-06 11:45:38,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 163 transitions. [2021-05-06 11:45:38,512 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 163 transitions. Word has length 105 [2021-05-06 11:45:38,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:38,512 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 163 transitions. [2021-05-06 11:45:38,513 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) [2021-05-06 11:45:38,513 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 163 transitions. [2021-05-06 11:45:38,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-05-06 11:45:38,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:38,513 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] [2021-05-06 11:45:38,513 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-06 11:45:38,513 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:38,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:38,513 INFO L82 PathProgramCache]: Analyzing trace with hash -523023286, now seen corresponding path program 36 times [2021-05-06 11:45:38,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:38,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659445140] [2021-05-06 11:45:38,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:38,515 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:45:38,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:38,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:38,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:38,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:45:38,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:38,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:45:38,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:39,275 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:39,275 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:39,276 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659445140] [2021-05-06 11:45:39,276 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [659445140] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:39,276 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:39,276 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:45:39,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852290601] [2021-05-06 11:45:39,276 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:45:39,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:39,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:45:39,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:45:39,276 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) [2021-05-06 11:45:50,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:50,868 INFO L93 Difference]: Finished difference Result 248 states and 294 transitions. [2021-05-06 11:45:50,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-06 11:45:50,868 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 [2021-05-06 11:45:50,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:50,869 INFO L225 Difference]: With dead ends: 248 [2021-05-06 11:45:50,869 INFO L226 Difference]: Without dead ends: 177 [2021-05-06 11:45:50,870 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2882 ImplicationChecksByTransitivity, 10323.3ms TimeCoverageRelationStatistics Valid=4462, Invalid=9344, Unknown=0, NotChecked=0, Total=13806 [2021-05-06 11:45:50,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-05-06 11:45:50,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 141. [2021-05-06 11:45:50,889 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) [2021-05-06 11:45:50,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 164 transitions. [2021-05-06 11:45:50,889 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 164 transitions. Word has length 106 [2021-05-06 11:45:50,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:50,889 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 164 transitions. [2021-05-06 11:45:50,889 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) [2021-05-06 11:45:50,890 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 164 transitions. [2021-05-06 11:45:50,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 11:45:50,890 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:50,890 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] [2021-05-06 11:45:50,890 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 11:45:50,890 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:50,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:50,890 INFO L82 PathProgramCache]: Analyzing trace with hash 386454584, now seen corresponding path program 37 times [2021-05-06 11:45:50,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:50,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251323861] [2021-05-06 11:45:50,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:50,892 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:45:50,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:51,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:51,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:51,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:45:51,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:51,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:45:51,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:51,695 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:51,695 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:51,695 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251323861] [2021-05-06 11:45:51,695 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1251323861] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:51,695 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:51,695 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 11:45:51,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35202368] [2021-05-06 11:45:51,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 11:45:51,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:51,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 11:45:51,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:45:51,696 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) [2021-05-06 11:46:06,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:06,330 INFO L93 Difference]: Finished difference Result 253 states and 300 transitions. [2021-05-06 11:46:06,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-06 11:46:06,331 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 [2021-05-06 11:46:06,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:06,332 INFO L225 Difference]: With dead ends: 253 [2021-05-06 11:46:06,332 INFO L226 Difference]: Without dead ends: 181 [2021-05-06 11:46:06,333 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3036 ImplicationChecksByTransitivity, 10592.1ms TimeCoverageRelationStatistics Valid=4696, Invalid=9824, Unknown=0, NotChecked=0, Total=14520 [2021-05-06 11:46:06,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-06 11:46:06,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 142. [2021-05-06 11:46:06,352 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) [2021-05-06 11:46:06,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 165 transitions. [2021-05-06 11:46:06,353 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 165 transitions. Word has length 107 [2021-05-06 11:46:06,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:06,353 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 165 transitions. [2021-05-06 11:46:06,353 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) [2021-05-06 11:46:06,353 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 165 transitions. [2021-05-06 11:46:06,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-05-06 11:46:06,353 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:06,354 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] [2021-05-06 11:46:06,354 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:46:06,354 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:06,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:06,354 INFO L82 PathProgramCache]: Analyzing trace with hash -1484502518, now seen corresponding path program 38 times [2021-05-06 11:46:06,354 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:06,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1238456913] [2021-05-06 11:46:06,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:06,355 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:46:06,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:06,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:06,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:06,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:46:06,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:06,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:46:06,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:07,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:07,149 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:07,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1238456913] [2021-05-06 11:46:07,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1238456913] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:07,149 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:07,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:46:07,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8220827] [2021-05-06 11:46:07,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:46:07,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:07,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:46:07,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=1066, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:46:07,150 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) [2021-05-06 11:46:14,649 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:46:19,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:19,486 INFO L93 Difference]: Finished difference Result 258 states and 306 transitions. [2021-05-06 11:46:19,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-05-06 11:46:19,487 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 [2021-05-06 11:46:19,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:19,488 INFO L225 Difference]: With dead ends: 258 [2021-05-06 11:46:19,488 INFO L226 Difference]: Without dead ends: 185 [2021-05-06 11:46:19,489 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3194 ImplicationChecksByTransitivity, 10999.8ms TimeCoverageRelationStatistics Valid=4936, Invalid=10316, Unknown=0, NotChecked=0, Total=15252 [2021-05-06 11:46:19,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-06 11:46:19,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 143. [2021-05-06 11:46:19,509 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) [2021-05-06 11:46:19,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 166 transitions. [2021-05-06 11:46:19,509 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 166 transitions. Word has length 108 [2021-05-06 11:46:19,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:19,510 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 166 transitions. [2021-05-06 11:46:19,510 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) [2021-05-06 11:46:19,510 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 166 transitions. [2021-05-06 11:46:19,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-06 11:46:19,510 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:19,510 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] [2021-05-06 11:46:19,510 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 11:46:19,510 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:19,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:19,510 INFO L82 PathProgramCache]: Analyzing trace with hash 645369464, now seen corresponding path program 39 times [2021-05-06 11:46:19,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:19,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280413036] [2021-05-06 11:46:19,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:19,512 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:46:19,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:19,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:19,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:19,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:46:19,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:19,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:46:19,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:20,353 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:20,353 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:20,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280413036] [2021-05-06 11:46:20,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1280413036] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:20,354 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:20,354 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 11:46:20,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468994175] [2021-05-06 11:46:20,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 11:46:20,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:20,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 11:46:20,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=867, Invalid=1113, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:46:20,354 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) [2021-05-06 11:46:22,977 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:46:23,125 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:46:23,259 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:46:23,395 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:46:23,532 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:46:23,675 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:46:23,830 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:46:26,981 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:46:32,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:32,438 INFO L93 Difference]: Finished difference Result 263 states and 312 transitions. [2021-05-06 11:46:32,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-06 11:46:32,439 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 [2021-05-06 11:46:32,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:32,439 INFO L225 Difference]: With dead ends: 263 [2021-05-06 11:46:32,439 INFO L226 Difference]: Without dead ends: 189 [2021-05-06 11:46:32,440 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3356 ImplicationChecksByTransitivity, 11441.7ms TimeCoverageRelationStatistics Valid=5182, Invalid=10820, Unknown=0, NotChecked=0, Total=16002 [2021-05-06 11:46:32,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-05-06 11:46:32,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 144. [2021-05-06 11:46:32,462 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) [2021-05-06 11:46:32,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 167 transitions. [2021-05-06 11:46:32,462 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 167 transitions. Word has length 109 [2021-05-06 11:46:32,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:32,463 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 167 transitions. [2021-05-06 11:46:32,463 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) [2021-05-06 11:46:32,463 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 167 transitions. [2021-05-06 11:46:32,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-06 11:46:32,463 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:32,463 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] [2021-05-06 11:46:32,463 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 11:46:32,463 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:32,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:32,463 INFO L82 PathProgramCache]: Analyzing trace with hash -2048075830, now seen corresponding path program 40 times [2021-05-06 11:46:32,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:32,464 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644830976] [2021-05-06 11:46:32,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:32,465 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:46:32,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:32,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:32,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:32,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:46:32,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:32,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:46:32,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:33,353 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:33,354 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:33,354 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644830976] [2021-05-06 11:46:33,354 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1644830976] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:33,354 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:33,354 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 11:46:33,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599864322] [2021-05-06 11:46:33,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 11:46:33,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:33,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 11:46:33,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=909, Invalid=1161, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:46:33,355 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) [2021-05-06 11:46:37,022 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:46:47,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:47,065 INFO L93 Difference]: Finished difference Result 268 states and 318 transitions. [2021-05-06 11:46:47,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-05-06 11:46:47,065 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 [2021-05-06 11:46:47,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:47,066 INFO L225 Difference]: With dead ends: 268 [2021-05-06 11:46:47,066 INFO L226 Difference]: Without dead ends: 193 [2021-05-06 11:46:47,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3522 ImplicationChecksByTransitivity, 11648.0ms TimeCoverageRelationStatistics Valid=5434, Invalid=11336, Unknown=0, NotChecked=0, Total=16770 [2021-05-06 11:46:47,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-05-06 11:46:47,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 145. [2021-05-06 11:46:47,090 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) [2021-05-06 11:46:47,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 168 transitions. [2021-05-06 11:46:47,091 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 168 transitions. Word has length 110 [2021-05-06 11:46:47,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:47,092 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 168 transitions. [2021-05-06 11:46:47,092 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) [2021-05-06 11:46:47,092 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 168 transitions. [2021-05-06 11:46:47,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-06 11:46:47,092 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:47,092 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] [2021-05-06 11:46:47,093 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:46:47,093 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:47,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:47,093 INFO L82 PathProgramCache]: Analyzing trace with hash 354465976, now seen corresponding path program 41 times [2021-05-06 11:46:47,093 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:47,093 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1935967251] [2021-05-06 11:46:47,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:47,095 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:46:47,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:47,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:47,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:47,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:46:47,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:47,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:46:47,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:48,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:48,009 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:48,009 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1935967251] [2021-05-06 11:46:48,009 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1935967251] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:48,009 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:48,009 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 11:46:48,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942422424] [2021-05-06 11:46:48,010 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 11:46:48,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:48,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 11:46:48,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=1210, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:46:48,010 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) [2021-05-06 11:47:05,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:05,352 INFO L93 Difference]: Finished difference Result 273 states and 324 transitions. [2021-05-06 11:47:05,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-06 11:47:05,353 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 [2021-05-06 11:47:05,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:05,353 INFO L225 Difference]: With dead ends: 273 [2021-05-06 11:47:05,353 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 11:47:05,355 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3692 ImplicationChecksByTransitivity, 12066.6ms TimeCoverageRelationStatistics Valid=5692, Invalid=11864, Unknown=0, NotChecked=0, Total=17556 [2021-05-06 11:47:05,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 11:47:05,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 146. [2021-05-06 11:47:05,381 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) [2021-05-06 11:47:05,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 169 transitions. [2021-05-06 11:47:05,382 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 169 transitions. Word has length 111 [2021-05-06 11:47:05,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:05,382 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 169 transitions. [2021-05-06 11:47:05,382 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) [2021-05-06 11:47:05,382 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 169 transitions. [2021-05-06 11:47:05,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-05-06 11:47:05,382 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:05,382 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] [2021-05-06 11:47:05,383 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-06 11:47:05,383 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:05,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:05,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1818817930, now seen corresponding path program 42 times [2021-05-06 11:47:05,383 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:05,383 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969142028] [2021-05-06 11:47:05,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:05,384 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:47:05,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:05,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:05,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:05,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:47:05,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:05,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:47:05,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:06,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:06,304 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:06,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969142028] [2021-05-06 11:47:06,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [969142028] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:06,305 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:06,305 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 11:47:06,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112099966] [2021-05-06 11:47:06,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 11:47:06,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:06,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 11:47:06,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=996, Invalid=1260, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:47:06,305 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) [2021-05-06 11:47:24,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:24,168 INFO L93 Difference]: Finished difference Result 278 states and 330 transitions. [2021-05-06 11:47:24,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-06 11:47:24,168 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 [2021-05-06 11:47:24,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:24,169 INFO L225 Difference]: With dead ends: 278 [2021-05-06 11:47:24,169 INFO L226 Difference]: Without dead ends: 201 [2021-05-06 11:47:24,170 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3866 ImplicationChecksByTransitivity, 12485.9ms TimeCoverageRelationStatistics Valid=5956, Invalid=12404, Unknown=0, NotChecked=0, Total=18360 [2021-05-06 11:47:24,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-05-06 11:47:24,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 147. [2021-05-06 11:47:24,198 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) [2021-05-06 11:47:24,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 170 transitions. [2021-05-06 11:47:24,199 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 170 transitions. Word has length 112 [2021-05-06 11:47:24,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:24,199 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 170 transitions. [2021-05-06 11:47:24,199 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) [2021-05-06 11:47:24,199 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 170 transitions. [2021-05-06 11:47:24,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 11:47:24,200 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:24,200 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] [2021-05-06 11:47:24,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-06 11:47:24,200 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:24,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:24,200 INFO L82 PathProgramCache]: Analyzing trace with hash -30911752, now seen corresponding path program 43 times [2021-05-06 11:47:24,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:24,200 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545780216] [2021-05-06 11:47:24,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:24,202 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:47:24,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:24,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:24,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:24,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:47:24,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:24,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:47:24,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:25,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:25,179 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:25,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545780216] [2021-05-06 11:47:25,179 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [545780216] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:25,179 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:25,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 11:47:25,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656489027] [2021-05-06 11:47:25,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 11:47:25,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:25,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 11:47:25,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1041, Invalid=1311, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:47:25,180 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) [2021-05-06 11:47:32,901 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:33,056 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:33,711 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:33,893 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:34,059 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:34,240 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:34,419 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:34,592 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:34,771 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:35,137 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:35,315 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:35,519 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:35,713 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:35,920 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:36,162 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:36,588 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:47:37,183 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:47:37,777 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:47:38,437 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:47:39,155 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:47:43,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:43,819 INFO L93 Difference]: Finished difference Result 283 states and 336 transitions. [2021-05-06 11:47:43,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-05-06 11:47:43,820 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 [2021-05-06 11:47:43,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:43,820 INFO L225 Difference]: With dead ends: 283 [2021-05-06 11:47:43,821 INFO L226 Difference]: Without dead ends: 205 [2021-05-06 11:47:43,822 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4044 ImplicationChecksByTransitivity, 13613.4ms TimeCoverageRelationStatistics Valid=6226, Invalid=12956, Unknown=0, NotChecked=0, Total=19182 [2021-05-06 11:47:43,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-05-06 11:47:43,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 148. [2021-05-06 11:47:43,851 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) [2021-05-06 11:47:43,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 171 transitions. [2021-05-06 11:47:43,852 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 171 transitions. Word has length 113 [2021-05-06 11:47:43,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:43,852 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 171 transitions. [2021-05-06 11:47:43,852 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) [2021-05-06 11:47:43,852 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 171 transitions. [2021-05-06 11:47:43,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 11:47:43,852 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:43,852 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] [2021-05-06 11:47:43,852 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:47:43,853 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:43,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:43,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1537957046, now seen corresponding path program 44 times [2021-05-06 11:47:43,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:43,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [14042991] [2021-05-06 11:47:43,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:43,854 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:47:43,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:43,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:43,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:43,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:47:43,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:43,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:47:43,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:44,857 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:44,857 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:44,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [14042991] [2021-05-06 11:47:44,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [14042991] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:44,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:44,858 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 11:47:44,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000894145] [2021-05-06 11:47:44,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 11:47:44,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:44,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 11:47:44,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1087, Invalid=1363, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:47:44,858 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) [2021-05-06 11:48:05,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:48:05,147 INFO L93 Difference]: Finished difference Result 288 states and 342 transitions. [2021-05-06 11:48:05,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-05-06 11:48:05,148 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 [2021-05-06 11:48:05,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:48:05,158 INFO L225 Difference]: With dead ends: 288 [2021-05-06 11:48:05,158 INFO L226 Difference]: Without dead ends: 209 [2021-05-06 11:48:05,159 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4226 ImplicationChecksByTransitivity, 13224.9ms TimeCoverageRelationStatistics Valid=6502, Invalid=13520, Unknown=0, NotChecked=0, Total=20022 [2021-05-06 11:48:05,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-06 11:48:05,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 149. [2021-05-06 11:48:05,193 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) [2021-05-06 11:48:05,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 172 transitions. [2021-05-06 11:48:05,193 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 172 transitions. Word has length 114 [2021-05-06 11:48:05,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:48:05,193 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 172 transitions. [2021-05-06 11:48:05,193 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) [2021-05-06 11:48:05,193 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 172 transitions. [2021-05-06 11:48:05,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 11:48:05,194 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:48:05,194 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] [2021-05-06 11:48:05,194 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 11:48:05,194 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:48:05,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:48:05,194 INFO L82 PathProgramCache]: Analyzing trace with hash -1011720904, now seen corresponding path program 45 times [2021-05-06 11:48:05,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:48:05,194 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1012908201] [2021-05-06 11:48:05,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:48:05,196 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:48:05,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:05,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:48:05,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:05,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:48:05,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:05,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:48:05,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:06,251 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:48:06,251 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:48:06,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1012908201] [2021-05-06 11:48:06,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1012908201] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:48:06,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:48:06,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 11:48:06,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908959370] [2021-05-06 11:48:06,252 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 11:48:06,252 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:48:06,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 11:48:06,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1134, Invalid=1416, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:48:06,252 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) [2021-05-06 11:48:17,978 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:18,154 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:18,345 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:18,531 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:18,703 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:18,892 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:19,081 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:19,282 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:19,464 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:19,645 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:19,833 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:20,460 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:20,949 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:21,419 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:21,720 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:48:22,136 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:48:23,609 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:48:25,115 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:48:25,291 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:48:29,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:48:29,343 INFO L93 Difference]: Finished difference Result 293 states and 348 transitions. [2021-05-06 11:48:29,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-05-06 11:48:29,343 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 [2021-05-06 11:48:29,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:48:29,344 INFO L225 Difference]: With dead ends: 293 [2021-05-06 11:48:29,344 INFO L226 Difference]: Without dead ends: 213 [2021-05-06 11:48:29,345 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4412 ImplicationChecksByTransitivity, 14440.4ms TimeCoverageRelationStatistics Valid=6784, Invalid=14096, Unknown=0, NotChecked=0, Total=20880 [2021-05-06 11:48:29,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-06 11:48:29,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 150. [2021-05-06 11:48:29,379 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) [2021-05-06 11:48:29,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 173 transitions. [2021-05-06 11:48:29,380 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 173 transitions. Word has length 115 [2021-05-06 11:48:29,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:48:29,380 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 173 transitions. [2021-05-06 11:48:29,380 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) [2021-05-06 11:48:29,380 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 173 transitions. [2021-05-06 11:48:29,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-06 11:48:29,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:48:29,381 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] [2021-05-06 11:48:29,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-06 11:48:29,381 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:48:29,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:48:29,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1878269686, now seen corresponding path program 46 times [2021-05-06 11:48:29,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:48:29,381 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [491646275] [2021-05-06 11:48:29,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:48:29,382 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:48:29,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:29,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:48:29,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:29,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:48:29,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:29,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:48:29,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:30,445 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:48:30,445 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:48:30,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [491646275] [2021-05-06 11:48:30,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [491646275] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:48:30,445 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:48:30,445 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 11:48:30,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710608914] [2021-05-06 11:48:30,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 11:48:30,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:48:30,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 11:48:30,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1182, Invalid=1470, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:48:30,446 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) [2021-05-06 11:48:47,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:48:47,762 INFO L93 Difference]: Finished difference Result 298 states and 354 transitions. [2021-05-06 11:48:47,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-06 11:48:47,762 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 [2021-05-06 11:48:47,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:48:47,763 INFO L225 Difference]: With dead ends: 298 [2021-05-06 11:48:47,763 INFO L226 Difference]: Without dead ends: 217 [2021-05-06 11:48:47,764 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4602 ImplicationChecksByTransitivity, 13987.7ms TimeCoverageRelationStatistics Valid=7072, Invalid=14684, Unknown=0, NotChecked=0, Total=21756 [2021-05-06 11:48:47,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-05-06 11:48:47,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 151. [2021-05-06 11:48:47,794 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) [2021-05-06 11:48:47,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 174 transitions. [2021-05-06 11:48:47,795 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 174 transitions. Word has length 116 [2021-05-06 11:48:47,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:48:47,795 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 174 transitions. [2021-05-06 11:48:47,795 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) [2021-05-06 11:48:47,795 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 174 transitions. [2021-05-06 11:48:47,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-06 11:48:47,795 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:48:47,795 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] [2021-05-06 11:48:47,795 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:48:47,795 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:48:47,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:48:47,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1323489144, now seen corresponding path program 47 times [2021-05-06 11:48:47,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:48:47,796 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2059162655] [2021-05-06 11:48:47,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:48:47,797 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:48:47,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:47,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:48:47,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:47,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:48:47,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:47,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:48:47,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:48,921 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:48:48,921 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:48:48,921 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2059162655] [2021-05-06 11:48:48,921 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2059162655] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:48:48,921 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:48:48,921 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-06 11:48:48,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326582316] [2021-05-06 11:48:48,922 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 11:48:48,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:48:48,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 11:48:48,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1231, Invalid=1525, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:48:48,922 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) [2021-05-06 11:49:05,082 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:49:12,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:49:12,310 INFO L93 Difference]: Finished difference Result 303 states and 360 transitions. [2021-05-06 11:49:12,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-05-06 11:49:12,311 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 [2021-05-06 11:49:12,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:49:12,312 INFO L225 Difference]: With dead ends: 303 [2021-05-06 11:49:12,312 INFO L226 Difference]: Without dead ends: 221 [2021-05-06 11:49:12,313 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4796 ImplicationChecksByTransitivity, 14543.6ms TimeCoverageRelationStatistics Valid=7366, Invalid=15284, Unknown=0, NotChecked=0, Total=22650 [2021-05-06 11:49:12,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-05-06 11:49:12,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 152. [2021-05-06 11:49:12,345 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) [2021-05-06 11:49:12,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 175 transitions. [2021-05-06 11:49:12,345 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 175 transitions. Word has length 117 [2021-05-06 11:49:12,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:49:12,345 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 175 transitions. [2021-05-06 11:49:12,345 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) [2021-05-06 11:49:12,345 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 175 transitions. [2021-05-06 11:49:12,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-05-06 11:49:12,346 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:49:12,346 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] [2021-05-06 11:49:12,346 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-06 11:49:12,346 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:49:12,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:49:12,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1793765066, now seen corresponding path program 48 times [2021-05-06 11:49:12,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:49:12,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465425695] [2021-05-06 11:49:12,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:49:12,348 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:49:12,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:12,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:49:12,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:12,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:49:12,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:12,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:49:12,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:13,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:49:13,482 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:49:13,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465425695] [2021-05-06 11:49:13,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [465425695] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:49:13,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:49:13,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:49:13,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674129578] [2021-05-06 11:49:13,482 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:49:13,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:49:13,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:49:13,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1281, Invalid=1581, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:49:13,483 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) [2021-05-06 11:49:38,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:49:38,510 INFO L93 Difference]: Finished difference Result 308 states and 366 transitions. [2021-05-06 11:49:38,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-05-06 11:49:38,511 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 [2021-05-06 11:49:38,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:49:38,512 INFO L225 Difference]: With dead ends: 308 [2021-05-06 11:49:38,512 INFO L226 Difference]: Without dead ends: 225 [2021-05-06 11:49:38,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4994 ImplicationChecksByTransitivity, 14815.4ms TimeCoverageRelationStatistics Valid=7666, Invalid=15896, Unknown=0, NotChecked=0, Total=23562 [2021-05-06 11:49:38,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2021-05-06 11:49:38,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 153. [2021-05-06 11:49:38,546 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) [2021-05-06 11:49:38,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 176 transitions. [2021-05-06 11:49:38,547 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 176 transitions. Word has length 118 [2021-05-06 11:49:38,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:49:38,547 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 176 transitions. [2021-05-06 11:49:38,547 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) [2021-05-06 11:49:38,547 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 176 transitions. [2021-05-06 11:49:38,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 11:49:38,548 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:49:38,548 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] [2021-05-06 11:49:38,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:49:38,548 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:49:38,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:49:38,548 INFO L82 PathProgramCache]: Analyzing trace with hash -807550536, now seen corresponding path program 49 times [2021-05-06 11:49:38,548 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:49:38,548 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404506445] [2021-05-06 11:49:38,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:49:38,554 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:49:38,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:38,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:49:38,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:38,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:49:38,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:38,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:49:38,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:39,726 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:49:39,726 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:49:39,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404506445] [2021-05-06 11:49:39,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1404506445] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:49:39,726 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:49:39,726 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-06 11:49:39,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135967390] [2021-05-06 11:49:39,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 11:49:39,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:49:39,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 11:49:39,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1332, Invalid=1638, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:49:39,727 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) [2021-05-06 11:50:03,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:50:03,556 INFO L93 Difference]: Finished difference Result 313 states and 372 transitions. [2021-05-06 11:50:03,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-05-06 11:50:03,557 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 [2021-05-06 11:50:03,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:50:03,558 INFO L225 Difference]: With dead ends: 313 [2021-05-06 11:50:03,558 INFO L226 Difference]: Without dead ends: 229 [2021-05-06 11:50:03,559 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5196 ImplicationChecksByTransitivity, 15281.3ms TimeCoverageRelationStatistics Valid=7972, Invalid=16520, Unknown=0, NotChecked=0, Total=24492 [2021-05-06 11:50:03,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-05-06 11:50:03,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 154. [2021-05-06 11:50:03,610 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) [2021-05-06 11:50:03,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 177 transitions. [2021-05-06 11:50:03,610 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 177 transitions. Word has length 119 [2021-05-06 11:50:03,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:50:03,611 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 177 transitions. [2021-05-06 11:50:03,611 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) [2021-05-06 11:50:03,611 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 177 transitions. [2021-05-06 11:50:03,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-05-06 11:50:03,612 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:50:03,612 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] [2021-05-06 11:50:03,612 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:50:03,612 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:50:03,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:50:03,612 INFO L82 PathProgramCache]: Analyzing trace with hash 156044426, now seen corresponding path program 50 times [2021-05-06 11:50:03,612 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:50:03,612 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952848355] [2021-05-06 11:50:03,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:50:03,619 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:50:03,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:03,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:50:03,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:03,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:50:03,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:03,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:50:03,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:04,857 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:50:04,857 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:50:04,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952848355] [2021-05-06 11:50:04,858 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1952848355] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:50:04,858 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:50:04,858 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-06 11:50:04,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207856251] [2021-05-06 11:50:04,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 11:50:04,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:50:04,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 11:50:04,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1384, Invalid=1696, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:50:04,859 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) [2021-05-06 11:50:30,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:50:30,231 INFO L93 Difference]: Finished difference Result 318 states and 378 transitions. [2021-05-06 11:50:30,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-05-06 11:50:30,231 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 [2021-05-06 11:50:30,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:50:30,232 INFO L225 Difference]: With dead ends: 318 [2021-05-06 11:50:30,232 INFO L226 Difference]: Without dead ends: 233 [2021-05-06 11:50:30,233 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5402 ImplicationChecksByTransitivity, 15645.8ms TimeCoverageRelationStatistics Valid=8284, Invalid=17156, Unknown=0, NotChecked=0, Total=25440 [2021-05-06 11:50:30,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-05-06 11:50:30,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 155. [2021-05-06 11:50:30,269 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) [2021-05-06 11:50:30,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 178 transitions. [2021-05-06 11:50:30,269 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 178 transitions. Word has length 120 [2021-05-06 11:50:30,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:50:30,269 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 178 transitions. [2021-05-06 11:50:30,269 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) [2021-05-06 11:50:30,270 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 178 transitions. [2021-05-06 11:50:30,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 11:50:30,270 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:50:30,270 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] [2021-05-06 11:50:30,270 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-06 11:50:30,270 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:50:30,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:50:30,270 INFO L82 PathProgramCache]: Analyzing trace with hash -37282824, now seen corresponding path program 51 times [2021-05-06 11:50:30,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:50:30,271 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1796686379] [2021-05-06 11:50:30,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:50:30,272 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:50:30,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:30,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:50:30,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:30,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:50:30,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:30,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:50:30,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:31,513 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:50:31,514 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:50:31,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1796686379] [2021-05-06 11:50:31,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1796686379] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:50:31,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:50:31,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:50:31,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330022255] [2021-05-06 11:50:31,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:50:31,514 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:50:31,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:50:31,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1437, Invalid=1755, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:50:31,515 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) [2021-05-06 11:50:48,384 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:51:00,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:51:00,037 INFO L93 Difference]: Finished difference Result 323 states and 384 transitions. [2021-05-06 11:51:00,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2021-05-06 11:51:00,038 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 [2021-05-06 11:51:00,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:51:00,039 INFO L225 Difference]: With dead ends: 323 [2021-05-06 11:51:00,039 INFO L226 Difference]: Without dead ends: 237 [2021-05-06 11:51:00,040 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5612 ImplicationChecksByTransitivity, 16154.3ms TimeCoverageRelationStatistics Valid=8602, Invalid=17804, Unknown=0, NotChecked=0, Total=26406 [2021-05-06 11:51:00,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-05-06 11:51:00,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 156. [2021-05-06 11:51:00,085 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) [2021-05-06 11:51:00,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 179 transitions. [2021-05-06 11:51:00,085 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 179 transitions. Word has length 121 [2021-05-06 11:51:00,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:51:00,086 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 179 transitions. [2021-05-06 11:51:00,086 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) [2021-05-06 11:51:00,086 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 179 transitions. [2021-05-06 11:51:00,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-06 11:51:00,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:51:00,086 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] [2021-05-06 11:51:00,086 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-06 11:51:00,086 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:51:00,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:51:00,087 INFO L82 PathProgramCache]: Analyzing trace with hash -1735460278, now seen corresponding path program 52 times [2021-05-06 11:51:00,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:51:00,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886803185] [2021-05-06 11:51:00,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:51:00,088 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:51:00,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:00,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:51:00,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:00,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:51:00,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:00,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:51:00,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:01,389 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:51:01,389 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:51:01,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886803185] [2021-05-06 11:51:01,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [886803185] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:51:01,389 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:51:01,389 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-06 11:51:01,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127917079] [2021-05-06 11:51:01,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 11:51:01,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:51:01,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 11:51:01,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1491, Invalid=1815, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:51:01,390 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) [2021-05-06 11:51:18,547 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:51:33,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:51:33,705 INFO L93 Difference]: Finished difference Result 328 states and 390 transitions. [2021-05-06 11:51:33,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-05-06 11:51:33,705 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 [2021-05-06 11:51:33,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:51:33,706 INFO L225 Difference]: With dead ends: 328 [2021-05-06 11:51:33,706 INFO L226 Difference]: Without dead ends: 241 [2021-05-06 11:51:33,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5826 ImplicationChecksByTransitivity, 16454.2ms TimeCoverageRelationStatistics Valid=8926, Invalid=18464, Unknown=0, NotChecked=0, Total=27390 [2021-05-06 11:51:33,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-05-06 11:51:33,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 157. [2021-05-06 11:51:33,746 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) [2021-05-06 11:51:33,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 180 transitions. [2021-05-06 11:51:33,746 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 180 transitions. Word has length 122 [2021-05-06 11:51:33,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:51:33,746 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 180 transitions. [2021-05-06 11:51:33,747 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) [2021-05-06 11:51:33,747 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 180 transitions. [2021-05-06 11:51:33,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-06 11:51:33,747 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:51:33,747 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] [2021-05-06 11:51:33,747 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:51:33,747 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:51:33,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:51:33,747 INFO L82 PathProgramCache]: Analyzing trace with hash 1455613496, now seen corresponding path program 53 times [2021-05-06 11:51:33,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:51:33,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1955275474] [2021-05-06 11:51:33,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:51:33,749 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:51:33,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:33,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:51:33,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:33,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:51:33,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:33,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:51:33,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:35,059 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:51:35,059 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:51:35,059 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1955275474] [2021-05-06 11:51:35,059 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1955275474] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:51:35,059 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:51:35,060 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-06 11:51:35,060 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992472335] [2021-05-06 11:51:35,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 11:51:35,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:51:35,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 11:51:35,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1546, Invalid=1876, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:51:35,060 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) [2021-05-06 11:51:48,695 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:51:59,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:51:59,078 INFO L93 Difference]: Finished difference Result 333 states and 396 transitions. [2021-05-06 11:51:59,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-05-06 11:51:59,078 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 [2021-05-06 11:51:59,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:51:59,079 INFO L225 Difference]: With dead ends: 333 [2021-05-06 11:51:59,079 INFO L226 Difference]: Without dead ends: 245 [2021-05-06 11:51:59,081 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6044 ImplicationChecksByTransitivity, 16736.5ms TimeCoverageRelationStatistics Valid=9256, Invalid=19136, Unknown=0, NotChecked=0, Total=28392 [2021-05-06 11:51:59,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-06 11:51:59,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 158. [2021-05-06 11:51:59,121 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) [2021-05-06 11:51:59,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 181 transitions. [2021-05-06 11:51:59,122 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 181 transitions. Word has length 123 [2021-05-06 11:51:59,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:51:59,122 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 181 transitions. [2021-05-06 11:51:59,122 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) [2021-05-06 11:51:59,122 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 181 transitions. [2021-05-06 11:51:59,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-06 11:51:59,122 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:51:59,122 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] [2021-05-06 11:51:59,123 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-06 11:51:59,123 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:51:59,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:51:59,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1594652682, now seen corresponding path program 54 times [2021-05-06 11:51:59,123 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:51:59,123 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378759062] [2021-05-06 11:51:59,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:51:59,124 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:51:59,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:59,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:51:59,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:59,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:51:59,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:59,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:51:59,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:00,484 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:52:00,484 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:52:00,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378759062] [2021-05-06 11:52:00,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [378759062] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:52:00,484 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:52:00,484 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 11:52:00,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124430225] [2021-05-06 11:52:00,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 11:52:00,484 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:52:00,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 11:52:00,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1602, Invalid=1938, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:52:00,485 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) [2021-05-06 11:52:27,722 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:52:33,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:52:33,520 INFO L93 Difference]: Finished difference Result 338 states and 402 transitions. [2021-05-06 11:52:33,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-05-06 11:52:33,521 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 [2021-05-06 11:52:33,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:52:33,521 INFO L225 Difference]: With dead ends: 338 [2021-05-06 11:52:33,522 INFO L226 Difference]: Without dead ends: 249 [2021-05-06 11:52:33,523 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6266 ImplicationChecksByTransitivity, 17267.8ms TimeCoverageRelationStatistics Valid=9592, Invalid=19820, Unknown=0, NotChecked=0, Total=29412 [2021-05-06 11:52:33,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-05-06 11:52:33,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 159. [2021-05-06 11:52:33,565 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) [2021-05-06 11:52:33,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 182 transitions. [2021-05-06 11:52:33,565 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 182 transitions. Word has length 124 [2021-05-06 11:52:33,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:52:33,566 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 182 transitions. [2021-05-06 11:52:33,566 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) [2021-05-06 11:52:33,566 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 182 transitions. [2021-05-06 11:52:33,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 11:52:33,566 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:52:33,566 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] [2021-05-06 11:52:33,566 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-06 11:52:33,566 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:52:33,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:52:33,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1609900152, now seen corresponding path program 55 times [2021-05-06 11:52:33,567 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:52:33,567 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1030043523] [2021-05-06 11:52:33,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:52:33,568 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:52:33,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:33,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:52:33,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:33,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:52:33,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:33,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:52:33,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:34,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:52:34,975 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:52:34,975 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1030043523] [2021-05-06 11:52:34,975 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1030043523] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:52:34,975 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:52:34,975 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-06 11:52:34,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086361323] [2021-05-06 11:52:34,976 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-06 11:52:34,976 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:52:34,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-06 11:52:34,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1659, Invalid=2001, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:52:34,976 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) [2021-05-06 11:52:54,211 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:52:54,405 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:52:54,616 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:52:54,805 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:53:01,508 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:53:08,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:08,908 INFO L93 Difference]: Finished difference Result 343 states and 408 transitions. [2021-05-06 11:53:08,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-05-06 11:53:08,908 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 [2021-05-06 11:53:08,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:08,909 INFO L225 Difference]: With dead ends: 343 [2021-05-06 11:53:08,909 INFO L226 Difference]: Without dead ends: 253 [2021-05-06 11:53:08,911 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6492 ImplicationChecksByTransitivity, 18091.0ms TimeCoverageRelationStatistics Valid=9934, Invalid=20516, Unknown=0, NotChecked=0, Total=30450 [2021-05-06 11:53:08,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-05-06 11:53:08,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 160. [2021-05-06 11:53:08,955 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) [2021-05-06 11:53:08,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 183 transitions. [2021-05-06 11:53:08,956 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 183 transitions. Word has length 125 [2021-05-06 11:53:08,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:08,956 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 183 transitions. [2021-05-06 11:53:08,956 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) [2021-05-06 11:53:08,956 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 183 transitions. [2021-05-06 11:53:08,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-05-06 11:53:08,956 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:08,956 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] [2021-05-06 11:53:08,957 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:53:08,957 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:08,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:08,957 INFO L82 PathProgramCache]: Analyzing trace with hash 2082571722, now seen corresponding path program 56 times [2021-05-06 11:53:08,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:08,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153472706] [2021-05-06 11:53:08,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:08,958 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:53:08,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:09,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:09,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:09,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:53:09,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:09,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:53:09,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:10,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:10,401 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:10,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153472706] [2021-05-06 11:53:10,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1153472706] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:10,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:10,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-06 11:53:10,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804492597] [2021-05-06 11:53:10,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 11:53:10,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:10,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 11:53:10,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1717, Invalid=2065, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:53:10,402 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) [2021-05-06 11:53:29,069 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:53:39,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:39,454 INFO L93 Difference]: Finished difference Result 348 states and 414 transitions. [2021-05-06 11:53:39,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-05-06 11:53:39,455 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 [2021-05-06 11:53:39,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:39,456 INFO L225 Difference]: With dead ends: 348 [2021-05-06 11:53:39,456 INFO L226 Difference]: Without dead ends: 257 [2021-05-06 11:53:39,457 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6722 ImplicationChecksByTransitivity, 18183.8ms TimeCoverageRelationStatistics Valid=10282, Invalid=21224, Unknown=0, NotChecked=0, Total=31506 [2021-05-06 11:53:39,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-05-06 11:53:39,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 161. [2021-05-06 11:53:39,504 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) [2021-05-06 11:53:39,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 184 transitions. [2021-05-06 11:53:39,504 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 184 transitions. Word has length 126 [2021-05-06 11:53:39,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:39,504 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 184 transitions. [2021-05-06 11:53:39,504 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) [2021-05-06 11:53:39,504 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 184 transitions. [2021-05-06 11:53:39,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-06 11:53:39,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:39,505 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] [2021-05-06 11:53:39,505 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-06 11:53:39,505 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:39,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:39,505 INFO L82 PathProgramCache]: Analyzing trace with hash -444478792, now seen corresponding path program 57 times [2021-05-06 11:53:39,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:39,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475070132] [2021-05-06 11:53:39,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:39,507 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:53:39,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:39,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:39,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:39,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:53:39,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:39,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:53:39,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:41,000 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:41,000 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:41,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475070132] [2021-05-06 11:53:41,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [475070132] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:41,000 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:41,000 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 11:53:41,000 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933281643] [2021-05-06 11:53:41,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 11:53:41,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:41,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 11:53:41,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1776, Invalid=2130, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:53:41,001 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) [2021-05-06 11:53:57,886 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:54:10,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:10,226 INFO L93 Difference]: Finished difference Result 353 states and 420 transitions. [2021-05-06 11:54:10,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2021-05-06 11:54:10,226 INFO L78 Accepts]: Start accepts. Automaton has 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) Word has length 127 [2021-05-06 11:54:10,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:10,227 INFO L225 Difference]: With dead ends: 353 [2021-05-06 11:54:10,227 INFO L226 Difference]: Without dead ends: 261 [2021-05-06 11:54:10,229 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6956 ImplicationChecksByTransitivity, 18627.4ms TimeCoverageRelationStatistics Valid=10636, Invalid=21944, Unknown=0, NotChecked=0, Total=32580 [2021-05-06 11:54:10,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-05-06 11:54:10,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 162. [2021-05-06 11:54:10,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 143 states have (on average 1.132867132867133) internal successors, (162), 143 states have internal predecessors, (162), 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) [2021-05-06 11:54:10,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 185 transitions. [2021-05-06 11:54:10,276 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 185 transitions. Word has length 127 [2021-05-06 11:54:10,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:10,276 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 185 transitions. [2021-05-06 11:54:10,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has 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) [2021-05-06 11:54:10,276 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 185 transitions. [2021-05-06 11:54:10,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-06 11:54:10,277 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:10,277 INFO L523 BasicCegarLoop]: trace histogram [82, 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] [2021-05-06 11:54:10,277 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-06 11:54:10,277 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:10,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:10,277 INFO L82 PathProgramCache]: Analyzing trace with hash -1473633398, now seen corresponding path program 58 times [2021-05-06 11:54:10,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:10,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500022475] [2021-05-06 11:54:10,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:10,279 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:54:10,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:10,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:10,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:10,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:54:10,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:10,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:54:10,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:11,795 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:11,796 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:11,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500022475] [2021-05-06 11:54:11,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [500022475] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:11,796 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:11,796 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-06 11:54:11,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961208048] [2021-05-06 11:54:11,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 11:54:11,796 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:11,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 11:54:11,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1836, Invalid=2196, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:54:11,797 INFO L87 Difference]: Start difference. First operand 162 states and 185 transitions. Second operand has 64 states, 64 states have (on average 1.484375) internal successors, (95), 62 states have internal predecessors, (95), 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) [2021-05-06 11:54:48,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:54:48,217 INFO L93 Difference]: Finished difference Result 358 states and 426 transitions. [2021-05-06 11:54:48,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-05-06 11:54:48,217 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.484375) internal successors, (95), 62 states have internal predecessors, (95), 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 128 [2021-05-06 11:54:48,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:54:48,229 INFO L225 Difference]: With dead ends: 358 [2021-05-06 11:54:48,229 INFO L226 Difference]: Without dead ends: 265 [2021-05-06 11:54:48,230 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7194 ImplicationChecksByTransitivity, 19166.0ms TimeCoverageRelationStatistics Valid=10996, Invalid=22676, Unknown=0, NotChecked=0, Total=33672 [2021-05-06 11:54:48,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-05-06 11:54:48,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 163. [2021-05-06 11:54:48,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 144 states have (on average 1.1319444444444444) internal successors, (163), 144 states have internal predecessors, (163), 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) [2021-05-06 11:54:48,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 186 transitions. [2021-05-06 11:54:48,314 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 186 transitions. Word has length 128 [2021-05-06 11:54:48,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:54:48,314 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 186 transitions. [2021-05-06 11:54:48,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 1.484375) internal successors, (95), 62 states have internal predecessors, (95), 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) [2021-05-06 11:54:48,314 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 186 transitions. [2021-05-06 11:54:48,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-06 11:54:48,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:54:48,329 INFO L523 BasicCegarLoop]: trace histogram [83, 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] [2021-05-06 11:54:48,329 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:54:48,329 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:54:48,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:54:48,329 INFO L82 PathProgramCache]: Analyzing trace with hash 982312184, now seen corresponding path program 59 times [2021-05-06 11:54:48,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:54:48,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400156640] [2021-05-06 11:54:48,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:54:48,332 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:54:48,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:48,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:54:48,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:48,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:54:48,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:48,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:54:48,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:54:50,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:54:50,197 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:54:50,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [400156640] [2021-05-06 11:54:50,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [400156640] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:54:50,197 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:54:50,197 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 11:54:50,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524689759] [2021-05-06 11:54:50,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 11:54:50,197 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:54:50,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 11:54:50,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1897, Invalid=2263, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:54:50,198 INFO L87 Difference]: Start difference. First operand 163 states and 186 transitions. Second operand has 65 states, 65 states have (on average 1.476923076923077) internal successors, (96), 63 states have internal predecessors, (96), 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) [2021-05-06 11:55:11,203 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-06 11:55:11,779 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-06 11:55:29,268 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-06 11:55:31,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:31,378 INFO L93 Difference]: Finished difference Result 363 states and 432 transitions. [2021-05-06 11:55:31,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-05-06 11:55:31,378 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.476923076923077) internal successors, (96), 63 states have internal predecessors, (96), 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 129 [2021-05-06 11:55:31,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:31,379 INFO L225 Difference]: With dead ends: 363 [2021-05-06 11:55:31,379 INFO L226 Difference]: Without dead ends: 269 [2021-05-06 11:55:31,381 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7436 ImplicationChecksByTransitivity, 20000.2ms TimeCoverageRelationStatistics Valid=11362, Invalid=23420, Unknown=0, NotChecked=0, Total=34782 [2021-05-06 11:55:31,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-05-06 11:55:31,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 164. [2021-05-06 11:55:31,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 145 states have (on average 1.1310344827586207) internal successors, (164), 145 states have internal predecessors, (164), 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) [2021-05-06 11:55:31,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 187 transitions. [2021-05-06 11:55:31,435 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 187 transitions. Word has length 129 [2021-05-06 11:55:31,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:31,435 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 187 transitions. [2021-05-06 11:55:31,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 1.476923076923077) internal successors, (96), 63 states have internal predecessors, (96), 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) [2021-05-06 11:55:31,435 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 187 transitions. [2021-05-06 11:55:31,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-05-06 11:55:31,453 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:31,453 INFO L523 BasicCegarLoop]: trace histogram [84, 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] [2021-05-06 11:55:31,453 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-06 11:55:31,453 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:31,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:31,453 INFO L82 PathProgramCache]: Analyzing trace with hash -192786102, now seen corresponding path program 60 times [2021-05-06 11:55:31,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:31,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255759550] [2021-05-06 11:55:31,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:31,455 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:55:31,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:31,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:31,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:31,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 11:55:31,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:31,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:55:31,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:33,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:33,438 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:33,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255759550] [2021-05-06 11:55:33,438 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [255759550] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:33,438 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:33,438 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-06 11:55:33,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520197047] [2021-05-06 11:55:33,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-06 11:55:33,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:33,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-06 11:55:33,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1959, Invalid=2331, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:55:33,439 INFO L87 Difference]: Start difference. First operand 164 states and 187 transitions. Second operand has 66 states, 66 states have (on average 1.4696969696969697) internal successors, (97), 64 states have internal predecessors, (97), 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)