/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/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/discover_list.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 20:29:02,572 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 20:29:02,573 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 20:29:02,600 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-06 20:29:02,601 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-06 20:29:02,601 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-06 20:29:02,602 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-06 20:29:02,609 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-06 20:29:02,612 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-06 20:29:02,617 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-06 20:29:02,618 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-06 20:29:02,619 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-04-06 20:29:02,620 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 20:29:02,622 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 20:29:02,622 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 20:29:02,624 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 20:29:02,625 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 20:29:02,625 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 20:29:02,629 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 20:29:02,632 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 20:29:02,633 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 20:29:02,635 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 20:29:02,635 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 20:29:02,638 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 20:29:02,639 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 20:29:02,642 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-04-06 20:29:02,649 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 20:29:02,649 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 20:29:02,650 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 20:29:02,651 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-04-06 20:29:02,661 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 20:29:02,662 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 20:29:02,662 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 20:29:02,663 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 20:29:02,663 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 20:29:02,663 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 20:29:02,663 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 20:29:02,663 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 20:29:02,663 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 20:29:02,664 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 20:29:02,664 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 20:29:02,664 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 20:29:02,664 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 20:29:02,664 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 20:29:02,664 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 20:29:02,664 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 20:29:02,664 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 20:29:02,664 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 20:29:02,665 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 20:29:02,665 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 20:29:02,665 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 20:29:02,665 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-04-06 20:29:02,665 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 20:29:02,856 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 20:29:02,879 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 20:29:02,881 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 20:29:02,881 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 20:29:02,882 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 20:29:02,883 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/discover_list.c [2022-04-06 20:29:02,924 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54f148aec/55e99324092e428283881c6104d2c712/FLAG9925f720e [2022-04-06 20:29:03,286 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 20:29:03,288 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/discover_list.c [2022-04-06 20:29:03,297 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54f148aec/55e99324092e428283881c6104d2c712/FLAG9925f720e [2022-04-06 20:29:03,674 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54f148aec/55e99324092e428283881c6104d2c712 [2022-04-06 20:29:03,676 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 20:29:03,677 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 20:29:03,678 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 20:29:03,678 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 20:29:03,681 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 20:29:03,682 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 08:29:03" (1/1) ... [2022-04-06 20:29:03,683 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15f6bb4c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03, skipping insertion in model container [2022-04-06 20:29:03,683 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 08:29:03" (1/1) ... [2022-04-06 20:29:03,688 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 20:29:03,706 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 20:29:03,834 WARN L230 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] [2022-04-06 20:29:03,891 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 20:29:03,900 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 20:29:03,921 WARN L230 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] [2022-04-06 20:29:03,957 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 20:29:03,972 INFO L208 MainTranslator]: Completed translation [2022-04-06 20:29:03,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03 WrapperNode [2022-04-06 20:29:03,973 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 20:29:03,974 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 20:29:03,974 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 20:29:03,974 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 20:29:03,981 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03" (1/1) ... [2022-04-06 20:29:03,982 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03" (1/1) ... [2022-04-06 20:29:04,006 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03" (1/1) ... [2022-04-06 20:29:04,006 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03" (1/1) ... [2022-04-06 20:29:04,055 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03" (1/1) ... [2022-04-06 20:29:04,062 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03" (1/1) ... [2022-04-06 20:29:04,065 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03" (1/1) ... [2022-04-06 20:29:04,071 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 20:29:04,072 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 20:29:04,072 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 20:29:04,072 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 20:29:04,087 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03" (1/1) ... [2022-04-06 20:29:04,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 20:29:04,109 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:04,118 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-06 20:29:04,125 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-06 20:29:04,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 20:29:04,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 20:29:04,145 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 20:29:04,145 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 20:29:04,146 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_get_func_def_resp_len [2022-04-06 20:29:04,146 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_is_naa5 [2022-04-06 20:29:04,146 INFO L138 BoogieDeclarations]: Found implementation of procedure dStrHex [2022-04-06 20:29:04,146 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_get_num [2022-04-06 20:29:04,146 INFO L138 BoogieDeclarations]: Found implementation of procedure smp_get_llnum [2022-04-06 20:29:04,147 INFO L138 BoogieDeclarations]: Found implementation of procedure do_discover_list [2022-04-06 20:29:04,147 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 20:29:04,147 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2022-04-06 20:29:04,147 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 20:29:04,148 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 20:29:04,148 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure sscanf [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure memset [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure strcmp [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure strchr [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure strlen [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure getopt_long [2022-04-06 20:29:04,150 INFO L130 BoogieDeclarations]: Found specification of procedure smp_initiator_open [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure smp_send_req [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure smp_get_func_def_resp_len [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure smp_is_naa5 [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure dStrHex [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure smp_get_num [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure smp_get_llnum [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure do_discover_list [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure main6 [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure sprintf [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure toupper [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 20:29:04,151 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-04-06 20:29:04,152 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 20:29:04,152 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2022-04-06 20:29:04,152 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 20:29:04,152 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 20:29:04,152 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 20:29:04,152 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-04-06 20:29:04,152 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 20:29:04,152 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 20:29:04,277 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 20:29:04,278 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 20:29:04,933 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 20:29:04,939 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 20:29:04,939 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-06 20:29:04,941 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 08:29:04 BoogieIcfgContainer [2022-04-06 20:29:04,941 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 20:29:04,942 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 20:29:04,942 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 20:29:04,945 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 20:29:04,945 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 08:29:03" (1/3) ... [2022-04-06 20:29:04,945 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4abe147a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 08:29:04, skipping insertion in model container [2022-04-06 20:29:04,946 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 08:29:03" (2/3) ... [2022-04-06 20:29:04,946 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4abe147a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 08:29:04, skipping insertion in model container [2022-04-06 20:29:04,946 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 08:29:04" (3/3) ... [2022-04-06 20:29:04,947 INFO L111 eAbstractionObserver]: Analyzing ICFG discover_list.c [2022-04-06 20:29:04,950 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 20:29:04,950 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 20:29:04,987 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 20:29:04,992 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-06 20:29:04,992 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 20:29:05,017 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) [2022-04-06 20:29:05,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-04-06 20:29:05,024 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:05,024 INFO L499 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] [2022-04-06 20:29:05,024 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:05,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:05,028 INFO L85 PathProgramCache]: Analyzing trace with hash 467458188, now seen corresponding path program 1 times [2022-04-06 20:29:05,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:05,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [19682197] [2022-04-06 20:29:05,041 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:05,042 INFO L85 PathProgramCache]: Analyzing trace with hash 467458188, now seen corresponding path program 2 times [2022-04-06 20:29:05,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:05,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845240527] [2022-04-06 20:29:05,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:05,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:05,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:05,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:05,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:05,361 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:05,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:05,369 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2022-04-06 20:29:05,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:05,385 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 20:29:05,386 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:05,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845240527] [2022-04-06 20:29:05,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845240527] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:05,386 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:05,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 20:29:05,388 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:05,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [19682197] [2022-04-06 20:29:05,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [19682197] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:05,389 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:05,389 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 20:29:05,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718788179] [2022-04-06 20:29:05,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:05,392 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 20:29:05,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:05,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 20:29:05,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 20:29:05,415 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) [2022-04-06 20:29:05,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:05,869 INFO L93 Difference]: Finished difference Result 227 states and 347 transitions. [2022-04-06 20:29:05,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 20:29:05,872 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 [2022-04-06 20:29:05,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:05,882 INFO L225 Difference]: With dead ends: 227 [2022-04-06 20:29:05,882 INFO L226 Difference]: Without dead ends: 103 [2022-04-06 20:29:05,886 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-04-06 20:29:05,891 INFO L913 BasicCegarLoop]: 112 mSDtfsCounter, 202 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:05,892 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 141 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 20:29:05,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-04-06 20:29:05,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 76. [2022-04-06 20:29:05,936 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) [2022-04-06 20:29:05,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2022-04-06 20:29:05,942 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 46 [2022-04-06 20:29:05,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:05,942 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2022-04-06 20:29:05,943 INFO L479 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) [2022-04-06 20:29:05,943 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2022-04-06 20:29:05,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-04-06 20:29:05,945 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:05,945 INFO L499 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] [2022-04-06 20:29:05,945 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 20:29:05,946 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:05,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:05,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1776525110, now seen corresponding path program 1 times [2022-04-06 20:29:05,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:05,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1250523293] [2022-04-06 20:29:05,948 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:05,949 INFO L85 PathProgramCache]: Analyzing trace with hash -1776525110, now seen corresponding path program 2 times [2022-04-06 20:29:05,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:05,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832631812] [2022-04-06 20:29:05,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:05,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:06,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:06,116 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:06,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:06,129 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:06,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:06,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2022-04-06 20:29:06,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:06,185 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 20:29:06,186 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:06,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832631812] [2022-04-06 20:29:06,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832631812] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:06,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804017174] [2022-04-06 20:29:06,187 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:29:06,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:06,187 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:06,188 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:06,233 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 20:29:06,693 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:29:06,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:06,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 5 conjunts are in the unsatisfiable core [2022-04-06 20:29:06,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:06,862 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 20:29:06,862 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 20:29:06,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804017174] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:06,863 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 20:29:06,863 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 7 [2022-04-06 20:29:06,864 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:06,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1250523293] [2022-04-06 20:29:06,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1250523293] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:06,864 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:06,864 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 20:29:06,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854585841] [2022-04-06 20:29:06,864 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:06,864 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-06 20:29:06,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:06,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-06 20:29:06,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-04-06 20:29:06,865 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-04-06 20:29:06,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:06,898 INFO L93 Difference]: Finished difference Result 136 states and 178 transitions. [2022-04-06 20:29:06,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-06 20:29:06,898 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (7), 2 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 46 [2022-04-06 20:29:06,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:06,901 INFO L225 Difference]: With dead ends: 136 [2022-04-06 20:29:06,901 INFO L226 Difference]: Without dead ends: 77 [2022-04-06 20:29:06,903 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-04-06 20:29:06,904 INFO L913 BasicCegarLoop]: 94 mSDtfsCounter, 2 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:06,907 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 278 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 20:29:06,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-04-06 20:29:06,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-04-06 20:29:06,922 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) [2022-04-06 20:29:06,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 99 transitions. [2022-04-06 20:29:06,923 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 99 transitions. Word has length 46 [2022-04-06 20:29:06,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:06,924 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 99 transitions. [2022-04-06 20:29:06,924 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-04-06 20:29:06,924 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 99 transitions. [2022-04-06 20:29:06,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-04-06 20:29:06,925 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:06,925 INFO L499 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] [2022-04-06 20:29:06,950 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:07,139 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:07,139 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:07,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:07,140 INFO L85 PathProgramCache]: Analyzing trace with hash 1831279328, now seen corresponding path program 1 times [2022-04-06 20:29:07,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:07,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1794237459] [2022-04-06 20:29:07,141 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:07,141 INFO L85 PathProgramCache]: Analyzing trace with hash 1831279328, now seen corresponding path program 2 times [2022-04-06 20:29:07,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:07,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668813530] [2022-04-06 20:29:07,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:07,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:07,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:07,229 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:07,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:07,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:07,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:07,337 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2022-04-06 20:29:07,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:07,342 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 20:29:07,343 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:07,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668813530] [2022-04-06 20:29:07,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1668813530] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:07,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110107425] [2022-04-06 20:29:07,344 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:29:07,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:07,344 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:07,345 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:07,346 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 20:29:07,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:29:07,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:07,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-06 20:29:07,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:08,039 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 20:29:08,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:08,210 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 20:29:08,210 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110107425] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:08,210 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:08,210 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 12 [2022-04-06 20:29:08,211 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:08,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1794237459] [2022-04-06 20:29:08,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1794237459] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:08,211 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:08,211 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 20:29:08,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152711958] [2022-04-06 20:29:08,211 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:08,211 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 20:29:08,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:08,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 20:29:08,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-04-06 20:29:08,212 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) [2022-04-06 20:29:08,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:08,545 INFO L93 Difference]: Finished difference Result 142 states and 186 transitions. [2022-04-06 20:29:08,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 20:29:08,546 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 [2022-04-06 20:29:08,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:08,546 INFO L225 Difference]: With dead ends: 142 [2022-04-06 20:29:08,546 INFO L226 Difference]: Without dead ends: 82 [2022-04-06 20:29:08,547 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2022-04-06 20:29:08,547 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:08,548 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 143 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 20:29:08,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-04-06 20:29:08,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2022-04-06 20:29:08,554 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) [2022-04-06 20:29:08,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 100 transitions. [2022-04-06 20:29:08,554 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 100 transitions. Word has length 48 [2022-04-06 20:29:08,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:08,555 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 100 transitions. [2022-04-06 20:29:08,555 INFO L479 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) [2022-04-06 20:29:08,555 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 100 transitions. [2022-04-06 20:29:08,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-04-06 20:29:08,555 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:08,555 INFO L499 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] [2022-04-06 20:29:08,589 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:08,756 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-04-06 20:29:08,756 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:08,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:08,757 INFO L85 PathProgramCache]: Analyzing trace with hash -110265974, now seen corresponding path program 3 times [2022-04-06 20:29:08,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:08,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2117829269] [2022-04-06 20:29:08,757 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:08,757 INFO L85 PathProgramCache]: Analyzing trace with hash -110265974, now seen corresponding path program 4 times [2022-04-06 20:29:08,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:08,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607903771] [2022-04-06 20:29:08,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:08,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:08,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:08,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:08,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:08,850 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:08,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:08,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2022-04-06 20:29:08,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:08,931 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 20:29:08,931 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:08,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607903771] [2022-04-06 20:29:08,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607903771] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:08,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459675283] [2022-04-06 20:29:08,932 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:29:08,932 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:08,932 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:08,933 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:08,934 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 20:29:09,111 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:29:09,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:09,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 15 conjunts are in the unsatisfiable core [2022-04-06 20:29:09,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:09,238 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-04-06 20:29:09,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:09,401 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 20:29:09,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459675283] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:09,401 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:09,401 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 15 [2022-04-06 20:29:09,401 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:09,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2117829269] [2022-04-06 20:29:09,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2117829269] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:09,402 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:09,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 20:29:09,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892154331] [2022-04-06 20:29:09,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:09,402 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 20:29:09,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:09,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 20:29:09,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2022-04-06 20:29:09,403 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) [2022-04-06 20:29:09,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:09,828 INFO L93 Difference]: Finished difference Result 144 states and 188 transitions. [2022-04-06 20:29:09,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 20:29:09,829 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 [2022-04-06 20:29:09,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:09,829 INFO L225 Difference]: With dead ends: 144 [2022-04-06 20:29:09,829 INFO L226 Difference]: Without dead ends: 83 [2022-04-06 20:29:09,830 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2022-04-06 20:29:09,830 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:09,831 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 160 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 20:29:09,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-04-06 20:29:09,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 79. [2022-04-06 20:29:09,837 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) [2022-04-06 20:29:09,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 101 transitions. [2022-04-06 20:29:09,837 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 101 transitions. Word has length 50 [2022-04-06 20:29:09,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:09,837 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 101 transitions. [2022-04-06 20:29:09,837 INFO L479 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) [2022-04-06 20:29:09,838 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 101 transitions. [2022-04-06 20:29:09,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-04-06 20:29:09,838 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:09,838 INFO L499 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] [2022-04-06 20:29:09,861 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:10,044 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:10,044 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:10,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:10,045 INFO L85 PathProgramCache]: Analyzing trace with hash -523287008, now seen corresponding path program 5 times [2022-04-06 20:29:10,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:10,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1501275276] [2022-04-06 20:29:10,045 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:10,045 INFO L85 PathProgramCache]: Analyzing trace with hash -523287008, now seen corresponding path program 6 times [2022-04-06 20:29:10,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:10,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103624069] [2022-04-06 20:29:10,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:10,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:10,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:10,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:10,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:10,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:10,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:10,191 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-04-06 20:29:10,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:10,197 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-04-06 20:29:10,197 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:10,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103624069] [2022-04-06 20:29:10,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103624069] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:10,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634143164] [2022-04-06 20:29:10,197 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:29:10,197 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:10,198 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:10,198 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:10,199 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 20:29:11,400 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-06 20:29:11,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:11,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 723 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-06 20:29:11,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:11,544 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 18 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-04-06 20:29:11,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:11,739 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 18 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-04-06 20:29:11,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634143164] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:11,739 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:11,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 16 [2022-04-06 20:29:11,739 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:11,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1501275276] [2022-04-06 20:29:11,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1501275276] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:11,740 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:11,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 20:29:11,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518859996] [2022-04-06 20:29:11,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:11,740 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 20:29:11,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:11,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 20:29:11,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2022-04-06 20:29:11,741 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) [2022-04-06 20:29:12,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:12,134 INFO L93 Difference]: Finished difference Result 146 states and 190 transitions. [2022-04-06 20:29:12,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 20:29:12,135 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 [2022-04-06 20:29:12,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:12,136 INFO L225 Difference]: With dead ends: 146 [2022-04-06 20:29:12,136 INFO L226 Difference]: Without dead ends: 84 [2022-04-06 20:29:12,136 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=342, Unknown=0, NotChecked=0, Total=462 [2022-04-06 20:29:12,137 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:12,137 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 143 Invalid, 382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 20:29:12,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-04-06 20:29:12,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 80. [2022-04-06 20:29:12,143 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) [2022-04-06 20:29:12,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 102 transitions. [2022-04-06 20:29:12,143 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 102 transitions. Word has length 52 [2022-04-06 20:29:12,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:12,144 INFO L478 AbstractCegarLoop]: Abstraction has 80 states and 102 transitions. [2022-04-06 20:29:12,144 INFO L479 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) [2022-04-06 20:29:12,144 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 102 transitions. [2022-04-06 20:29:12,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-04-06 20:29:12,144 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:12,144 INFO L499 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] [2022-04-06 20:29:12,164 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:12,345 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:12,345 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:12,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:12,345 INFO L85 PathProgramCache]: Analyzing trace with hash -1966742966, now seen corresponding path program 7 times [2022-04-06 20:29:12,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:12,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1400598410] [2022-04-06 20:29:12,346 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:12,346 INFO L85 PathProgramCache]: Analyzing trace with hash -1966742966, now seen corresponding path program 8 times [2022-04-06 20:29:12,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:12,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112440497] [2022-04-06 20:29:12,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:12,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:12,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:12,411 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:12,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:12,425 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:12,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:12,529 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2022-04-06 20:29:12,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:12,540 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-06 20:29:12,540 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:12,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112440497] [2022-04-06 20:29:12,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112440497] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:12,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266340180] [2022-04-06 20:29:12,541 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:29:12,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:12,541 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:12,542 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:12,543 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 20:29:13,070 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:29:13,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:13,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 23 conjunts are in the unsatisfiable core [2022-04-06 20:29:13,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:13,225 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 7 proven. 36 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-04-06 20:29:13,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:13,453 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-06 20:29:13,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [266340180] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:13,453 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:13,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 21 [2022-04-06 20:29:13,454 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:13,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1400598410] [2022-04-06 20:29:13,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1400598410] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:13,454 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:13,454 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 20:29:13,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977163375] [2022-04-06 20:29:13,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:13,454 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 20:29:13,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:13,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 20:29:13,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2022-04-06 20:29:13,455 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) [2022-04-06 20:29:13,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:13,947 INFO L93 Difference]: Finished difference Result 148 states and 192 transitions. [2022-04-06 20:29:13,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-04-06 20:29:13,948 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 [2022-04-06 20:29:13,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:13,948 INFO L225 Difference]: With dead ends: 148 [2022-04-06 20:29:13,948 INFO L226 Difference]: Without dead ends: 85 [2022-04-06 20:29:13,949 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=179, Invalid=577, Unknown=0, NotChecked=0, Total=756 [2022-04-06 20:29:13,949 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 587 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 587 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:13,950 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 194 Invalid, 626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 587 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 20:29:13,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-04-06 20:29:13,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 81. [2022-04-06 20:29:13,956 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) [2022-04-06 20:29:13,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 103 transitions. [2022-04-06 20:29:13,956 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 103 transitions. Word has length 54 [2022-04-06 20:29:13,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:13,957 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 103 transitions. [2022-04-06 20:29:13,957 INFO L479 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) [2022-04-06 20:29:13,957 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 103 transitions. [2022-04-06 20:29:13,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-04-06 20:29:13,957 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:13,957 INFO L499 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] [2022-04-06 20:29:13,976 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:14,176 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:14,176 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:14,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:14,177 INFO L85 PathProgramCache]: Analyzing trace with hash -127655584, now seen corresponding path program 9 times [2022-04-06 20:29:14,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:14,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [631593398] [2022-04-06 20:29:14,177 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:14,177 INFO L85 PathProgramCache]: Analyzing trace with hash -127655584, now seen corresponding path program 10 times [2022-04-06 20:29:14,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:14,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251160760] [2022-04-06 20:29:14,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:14,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:14,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:14,264 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:14,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:14,278 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:14,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:14,401 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2022-04-06 20:29:14,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:14,408 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 20:29:14,408 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:14,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251160760] [2022-04-06 20:29:14,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251160760] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:14,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925447075] [2022-04-06 20:29:14,408 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:29:14,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:14,409 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:14,411 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:14,454 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 20:29:14,620 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:29:14,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:14,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 751 conjuncts, 28 conjunts are in the unsatisfiable core [2022-04-06 20:29:14,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:14,837 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 8 proven. 55 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-06 20:29:14,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:15,189 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 38 proven. 15 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 20:29:15,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925447075] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:15,189 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:15,189 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 24 [2022-04-06 20:29:15,190 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:15,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [631593398] [2022-04-06 20:29:15,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [631593398] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:15,190 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:15,190 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 20:29:15,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396642470] [2022-04-06 20:29:15,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:15,190 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 20:29:15,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:15,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 20:29:15,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=411, Unknown=0, NotChecked=0, Total=552 [2022-04-06 20:29:15,191 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) [2022-04-06 20:29:15,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:15,761 INFO L93 Difference]: Finished difference Result 150 states and 194 transitions. [2022-04-06 20:29:15,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-04-06 20:29:15,762 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 [2022-04-06 20:29:15,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:15,762 INFO L225 Difference]: With dead ends: 150 [2022-04-06 20:29:15,762 INFO L226 Difference]: Without dead ends: 86 [2022-04-06 20:29:15,763 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=232, Invalid=760, Unknown=0, NotChecked=0, Total=992 [2022-04-06 20:29:15,763 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:15,764 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 211 Invalid, 718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 677 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 20:29:15,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-04-06 20:29:15,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 82. [2022-04-06 20:29:15,770 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) [2022-04-06 20:29:15,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 104 transitions. [2022-04-06 20:29:15,770 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 104 transitions. Word has length 56 [2022-04-06 20:29:15,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:15,770 INFO L478 AbstractCegarLoop]: Abstraction has 82 states and 104 transitions. [2022-04-06 20:29:15,771 INFO L479 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) [2022-04-06 20:29:15,771 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 104 transitions. [2022-04-06 20:29:15,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-04-06 20:29:15,771 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:15,771 INFO L499 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] [2022-04-06 20:29:15,790 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:15,980 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:15,981 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:15,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:15,981 INFO L85 PathProgramCache]: Analyzing trace with hash -330196214, now seen corresponding path program 11 times [2022-04-06 20:29:15,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:15,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1692358339] [2022-04-06 20:29:15,983 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:15,983 INFO L85 PathProgramCache]: Analyzing trace with hash -330196214, now seen corresponding path program 12 times [2022-04-06 20:29:15,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:15,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965406997] [2022-04-06 20:29:15,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:15,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:16,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:16,067 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:16,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:16,077 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:16,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:16,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2022-04-06 20:29:16,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:16,234 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-04-06 20:29:16,234 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:16,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965406997] [2022-04-06 20:29:16,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965406997] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:16,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531091492] [2022-04-06 20:29:16,235 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:29:16,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:16,235 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:16,236 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:16,270 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 20:29:19,631 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 20:29:19,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:19,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 765 conjuncts, 23 conjunts are in the unsatisfiable core [2022-04-06 20:29:19,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:19,832 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 51 proven. 21 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-04-06 20:29:19,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:20,177 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 51 proven. 21 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-04-06 20:29:20,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531091492] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:20,177 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:20,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 10] total 28 [2022-04-06 20:29:20,177 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:20,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1692358339] [2022-04-06 20:29:20,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1692358339] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:20,178 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:20,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-04-06 20:29:20,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306809416] [2022-04-06 20:29:20,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:20,178 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-04-06 20:29:20,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:20,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-04-06 20:29:20,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=579, Unknown=0, NotChecked=0, Total=756 [2022-04-06 20:29:20,179 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) [2022-04-06 20:29:20,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:20,706 INFO L93 Difference]: Finished difference Result 152 states and 196 transitions. [2022-04-06 20:29:20,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 20:29:20,706 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 [2022-04-06 20:29:20,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:20,707 INFO L225 Difference]: With dead ends: 152 [2022-04-06 20:29:20,707 INFO L226 Difference]: Without dead ends: 87 [2022-04-06 20:29:20,708 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=289, Invalid=1043, Unknown=0, NotChecked=0, Total=1332 [2022-04-06 20:29:20,708 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 538 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:20,708 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 177 Invalid, 581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 538 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 20:29:20,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-04-06 20:29:20,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 83. [2022-04-06 20:29:20,719 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) [2022-04-06 20:29:20,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 105 transitions. [2022-04-06 20:29:20,720 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 105 transitions. Word has length 58 [2022-04-06 20:29:20,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:20,720 INFO L478 AbstractCegarLoop]: Abstraction has 83 states and 105 transitions. [2022-04-06 20:29:20,720 INFO L479 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) [2022-04-06 20:29:20,720 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 105 transitions. [2022-04-06 20:29:20,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-04-06 20:29:20,721 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:20,721 INFO L499 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] [2022-04-06 20:29:20,728 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:20,928 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:20,928 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:20,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:20,929 INFO L85 PathProgramCache]: Analyzing trace with hash -1036407648, now seen corresponding path program 13 times [2022-04-06 20:29:20,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:20,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [456582449] [2022-04-06 20:29:20,929 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:20,929 INFO L85 PathProgramCache]: Analyzing trace with hash -1036407648, now seen corresponding path program 14 times [2022-04-06 20:29:20,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:20,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456256574] [2022-04-06 20:29:20,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:20,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:20,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:20,986 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:20,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:20,994 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:20,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:21,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2022-04-06 20:29:21,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:21,164 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-04-06 20:29:21,164 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:21,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456256574] [2022-04-06 20:29:21,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456256574] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:21,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [751051112] [2022-04-06 20:29:21,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:29:21,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:21,165 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:21,165 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:21,166 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 20:29:21,699 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:29:21,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:21,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 779 conjuncts, 36 conjunts are in the unsatisfiable core [2022-04-06 20:29:21,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:22,007 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 10 proven. 105 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-04-06 20:29:22,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:22,580 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 66 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-04-06 20:29:22,580 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [751051112] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:22,580 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:22,580 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 30 [2022-04-06 20:29:22,581 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:22,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [456582449] [2022-04-06 20:29:22,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [456582449] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:22,581 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:22,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 20:29:22,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369604120] [2022-04-06 20:29:22,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:22,581 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 20:29:22,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:22,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 20:29:22,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=653, Unknown=0, NotChecked=0, Total=870 [2022-04-06 20:29:22,582 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) [2022-04-06 20:29:23,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:23,257 INFO L93 Difference]: Finished difference Result 154 states and 198 transitions. [2022-04-06 20:29:23,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-06 20:29:23,257 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 [2022-04-06 20:29:23,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:23,260 INFO L225 Difference]: With dead ends: 154 [2022-04-06 20:29:23,260 INFO L226 Difference]: Without dead ends: 88 [2022-04-06 20:29:23,260 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=352, Invalid=1208, Unknown=0, NotChecked=0, Total=1560 [2022-04-06 20:29:23,262 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 709 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 754 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 709 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:23,262 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 211 Invalid, 754 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 709 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 20:29:23,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-04-06 20:29:23,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2022-04-06 20:29:23,274 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) [2022-04-06 20:29:23,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 106 transitions. [2022-04-06 20:29:23,275 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 106 transitions. Word has length 60 [2022-04-06 20:29:23,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:23,276 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 106 transitions. [2022-04-06 20:29:23,276 INFO L479 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) [2022-04-06 20:29:23,276 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 106 transitions. [2022-04-06 20:29:23,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-04-06 20:29:23,280 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:23,280 INFO L499 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] [2022-04-06 20:29:23,301 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:23,495 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-04-06 20:29:23,495 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:23,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:23,496 INFO L85 PathProgramCache]: Analyzing trace with hash -2059623478, now seen corresponding path program 15 times [2022-04-06 20:29:23,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:23,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2050797003] [2022-04-06 20:29:23,496 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:23,496 INFO L85 PathProgramCache]: Analyzing trace with hash -2059623478, now seen corresponding path program 16 times [2022-04-06 20:29:23,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:23,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337020409] [2022-04-06 20:29:23,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:23,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:23,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:23,587 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:23,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:23,596 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:23,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:23,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-04-06 20:29:23,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:23,820 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-04-06 20:29:23,821 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:23,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337020409] [2022-04-06 20:29:23,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337020409] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:23,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627364814] [2022-04-06 20:29:23,821 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:29:23,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:23,821 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:23,822 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:23,823 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 20:29:24,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:29:24,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:24,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 793 conjuncts, 40 conjunts are in the unsatisfiable core [2022-04-06 20:29:24,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:24,426 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 11 proven. 136 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-06 20:29:24,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:25,020 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 83 proven. 36 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-04-06 20:29:25,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627364814] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:25,020 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:25,020 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 12] total 33 [2022-04-06 20:29:25,020 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:25,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2050797003] [2022-04-06 20:29:25,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2050797003] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:25,020 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:25,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-04-06 20:29:25,021 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532847239] [2022-04-06 20:29:25,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:25,021 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-06 20:29:25,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:25,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-06 20:29:25,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=795, Unknown=0, NotChecked=0, Total=1056 [2022-04-06 20:29:25,022 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) [2022-04-06 20:29:25,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:25,713 INFO L93 Difference]: Finished difference Result 156 states and 200 transitions. [2022-04-06 20:29:25,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-04-06 20:29:25,714 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 [2022-04-06 20:29:25,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:25,714 INFO L225 Difference]: With dead ends: 156 [2022-04-06 20:29:25,714 INFO L226 Difference]: Without dead ends: 89 [2022-04-06 20:29:25,715 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=421, Invalid=1471, Unknown=0, NotChecked=0, Total=1892 [2022-04-06 20:29:25,715 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 728 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:25,715 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 211 Invalid, 775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 728 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 20:29:25,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-04-06 20:29:25,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 85. [2022-04-06 20:29:25,720 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) [2022-04-06 20:29:25,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 107 transitions. [2022-04-06 20:29:25,720 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 107 transitions. Word has length 62 [2022-04-06 20:29:25,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:25,721 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 107 transitions. [2022-04-06 20:29:25,721 INFO L479 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) [2022-04-06 20:29:25,721 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 107 transitions. [2022-04-06 20:29:25,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-04-06 20:29:25,721 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:25,721 INFO L499 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] [2022-04-06 20:29:25,740 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:25,936 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-04-06 20:29:25,936 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:25,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:25,936 INFO L85 PathProgramCache]: Analyzing trace with hash -1482430496, now seen corresponding path program 17 times [2022-04-06 20:29:25,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:25,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [274344603] [2022-04-06 20:29:25,937 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:25,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1482430496, now seen corresponding path program 18 times [2022-04-06 20:29:25,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:25,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438445852] [2022-04-06 20:29:25,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:25,937 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:25,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:26,001 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:26,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:26,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:26,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:26,215 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2022-04-06 20:29:26,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:26,224 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 147 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-04-06 20:29:26,225 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:26,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438445852] [2022-04-06 20:29:26,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438445852] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:26,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537465897] [2022-04-06 20:29:26,225 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:29:26,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:26,225 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:26,226 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:26,245 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 20:29:33,862 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-04-06 20:29:33,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:33,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 807 conjuncts, 24 conjunts are in the unsatisfiable core [2022-04-06 20:29:33,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:34,251 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 103 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-04-06 20:29:34,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:34,888 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 147 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-04-06 20:29:34,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537465897] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:34,888 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:34,888 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13] total 36 [2022-04-06 20:29:34,888 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:34,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [274344603] [2022-04-06 20:29:34,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [274344603] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:34,888 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:34,888 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-04-06 20:29:34,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450497566] [2022-04-06 20:29:34,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:34,889 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 20:29:34,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:34,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 20:29:34,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=947, Unknown=0, NotChecked=0, Total=1260 [2022-04-06 20:29:34,889 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) [2022-04-06 20:29:35,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:35,722 INFO L93 Difference]: Finished difference Result 158 states and 202 transitions. [2022-04-06 20:29:35,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-04-06 20:29:35,723 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 [2022-04-06 20:29:35,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:35,723 INFO L225 Difference]: With dead ends: 158 [2022-04-06 20:29:35,724 INFO L226 Difference]: Without dead ends: 90 [2022-04-06 20:29:35,724 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=496, Invalid=1760, Unknown=0, NotChecked=0, Total=2256 [2022-04-06 20:29:35,725 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 1057 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 1106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1057 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:35,725 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 279 Invalid, 1106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1057 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 20:29:35,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-04-06 20:29:35,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 86. [2022-04-06 20:29:35,729 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) [2022-04-06 20:29:35,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 108 transitions. [2022-04-06 20:29:35,730 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 108 transitions. Word has length 64 [2022-04-06 20:29:35,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:35,730 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 108 transitions. [2022-04-06 20:29:35,730 INFO L479 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) [2022-04-06 20:29:35,730 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 108 transitions. [2022-04-06 20:29:35,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-04-06 20:29:35,731 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:35,731 INFO L499 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] [2022-04-06 20:29:35,742 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:35,940 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-04-06 20:29:35,940 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:35,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:35,940 INFO L85 PathProgramCache]: Analyzing trace with hash 1102249098, now seen corresponding path program 19 times [2022-04-06 20:29:35,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:35,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [526128010] [2022-04-06 20:29:35,941 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:35,941 INFO L85 PathProgramCache]: Analyzing trace with hash 1102249098, now seen corresponding path program 20 times [2022-04-06 20:29:35,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:35,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995413902] [2022-04-06 20:29:35,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:35,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:35,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:36,011 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:36,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:36,020 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:36,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:36,296 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2022-04-06 20:29:36,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:36,305 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 178 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-04-06 20:29:36,305 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:36,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995413902] [2022-04-06 20:29:36,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995413902] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:36,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [354526775] [2022-04-06 20:29:36,305 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:29:36,305 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:36,305 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:36,306 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:36,321 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-06 20:29:36,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:29:36,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:36,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 46 conjunts are in the unsatisfiable core [2022-04-06 20:29:36,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:37,282 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 24 proven. 199 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-06 20:29:37,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:38,224 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 123 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-04-06 20:29:38,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [354526775] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:38,224 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:38,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 14] total 39 [2022-04-06 20:29:38,224 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:38,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [526128010] [2022-04-06 20:29:38,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [526128010] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:38,225 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:38,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-04-06 20:29:38,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893463259] [2022-04-06 20:29:38,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:38,225 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-04-06 20:29:38,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:38,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-04-06 20:29:38,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=1121, Unknown=0, NotChecked=0, Total=1482 [2022-04-06 20:29:38,226 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) [2022-04-06 20:29:39,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:39,110 INFO L93 Difference]: Finished difference Result 160 states and 204 transitions. [2022-04-06 20:29:39,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-04-06 20:29:39,110 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 [2022-04-06 20:29:39,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:39,111 INFO L225 Difference]: With dead ends: 160 [2022-04-06 20:29:39,111 INFO L226 Difference]: Without dead ends: 91 [2022-04-06 20:29:39,112 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=577, Invalid=2075, Unknown=0, NotChecked=0, Total=2652 [2022-04-06 20:29:39,112 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 926 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 977 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 926 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:39,113 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 245 Invalid, 977 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 926 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 20:29:39,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-04-06 20:29:39,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 87. [2022-04-06 20:29:39,121 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) [2022-04-06 20:29:39,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 109 transitions. [2022-04-06 20:29:39,121 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 109 transitions. Word has length 66 [2022-04-06 20:29:39,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:39,122 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 109 transitions. [2022-04-06 20:29:39,122 INFO L479 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) [2022-04-06 20:29:39,122 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 109 transitions. [2022-04-06 20:29:39,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-04-06 20:29:39,122 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:39,122 INFO L499 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] [2022-04-06 20:29:39,141 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-04-06 20:29:39,323 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-04-06 20:29:39,323 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:39,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:39,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1393110240, now seen corresponding path program 21 times [2022-04-06 20:29:39,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:39,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [775565202] [2022-04-06 20:29:39,324 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:39,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1393110240, now seen corresponding path program 22 times [2022-04-06 20:29:39,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:39,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787625385] [2022-04-06 20:29:39,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:39,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:39,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:39,390 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:39,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:39,399 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:39,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:39,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2022-04-06 20:29:39,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:39,740 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2022-04-06 20:29:39,740 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:39,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787625385] [2022-04-06 20:29:39,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787625385] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:39,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761790697] [2022-04-06 20:29:39,740 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:29:39,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:39,741 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:39,742 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:39,743 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-06 20:29:39,998 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:29:39,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:29:40,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 835 conjuncts, 28 conjunts are in the unsatisfiable core [2022-04-06 20:29:40,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:29:40,463 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 147 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-04-06 20:29:40,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:29:41,442 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2022-04-06 20:29:41,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [761790697] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:29:41,443 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:29:41,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 15] total 42 [2022-04-06 20:29:41,443 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:29:41,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [775565202] [2022-04-06 20:29:41,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [775565202] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:29:41,443 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:29:41,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-04-06 20:29:41,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214917086] [2022-04-06 20:29:41,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:29:41,443 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-04-06 20:29:41,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:41,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-04-06 20:29:41,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=1301, Unknown=0, NotChecked=0, Total=1722 [2022-04-06 20:29:41,444 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) [2022-04-06 20:29:42,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:29:42,526 INFO L93 Difference]: Finished difference Result 162 states and 206 transitions. [2022-04-06 20:29:42,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-04-06 20:29:42,526 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 [2022-04-06 20:29:42,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:29:42,527 INFO L225 Difference]: With dead ends: 162 [2022-04-06 20:29:42,527 INFO L226 Difference]: Without dead ends: 92 [2022-04-06 20:29:42,528 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=664, Invalid=2416, Unknown=0, NotChecked=0, Total=3080 [2022-04-06 20:29:42,528 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 1105 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 1158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-04-06 20:29:42,529 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 279 Invalid, 1158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1105 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-04-06 20:29:42,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-04-06 20:29:42,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 88. [2022-04-06 20:29:42,534 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) [2022-04-06 20:29:42,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 110 transitions. [2022-04-06 20:29:42,534 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 110 transitions. Word has length 68 [2022-04-06 20:29:42,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:29:42,534 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 110 transitions. [2022-04-06 20:29:42,534 INFO L479 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) [2022-04-06 20:29:42,534 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 110 transitions. [2022-04-06 20:29:42,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-04-06 20:29:42,535 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:29:42,535 INFO L499 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] [2022-04-06 20:29:42,554 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-04-06 20:29:42,735 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-06 20:29:42,735 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:29:42,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:29:42,736 INFO L85 PathProgramCache]: Analyzing trace with hash 1390454090, now seen corresponding path program 23 times [2022-04-06 20:29:42,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:29:42,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1234474009] [2022-04-06 20:29:42,736 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:29:42,736 INFO L85 PathProgramCache]: Analyzing trace with hash 1390454090, now seen corresponding path program 24 times [2022-04-06 20:29:42,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:29:42,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103599009] [2022-04-06 20:29:42,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:29:42,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:29:42,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:42,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:29:42,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:42,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:29:42,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:43,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2022-04-06 20:29:43,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:29:43,175 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 0 proven. 249 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2022-04-06 20:29:43,175 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:29:43,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103599009] [2022-04-06 20:29:43,175 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103599009] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:29:43,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062021179] [2022-04-06 20:29:43,175 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:29:43,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:29:43,175 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:29:43,176 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:29:43,177 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-04-06 20:31:20,911 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2022-04-06 20:31:20,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:31:20,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 849 conjuncts, 62 conjunts are in the unsatisfiable core [2022-04-06 20:31:20,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:31:21,567 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 172 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-04-06 20:31:21,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:31:22,919 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 171 proven. 78 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2022-04-06 20:31:22,919 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062021179] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:31:22,919 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:31:22,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 16] total 45 [2022-04-06 20:31:22,920 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:31:22,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1234474009] [2022-04-06 20:31:22,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1234474009] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:31:22,920 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:31:22,920 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-04-06 20:31:22,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466695932] [2022-04-06 20:31:22,920 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:31:22,920 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 20:31:22,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:31:22,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 20:31:22,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=1497, Unknown=0, NotChecked=0, Total=1980 [2022-04-06 20:31:22,921 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) [2022-04-06 20:31:23,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:31:23,788 INFO L93 Difference]: Finished difference Result 164 states and 208 transitions. [2022-04-06 20:31:23,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-04-06 20:31:23,788 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 [2022-04-06 20:31:23,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:31:23,789 INFO L225 Difference]: With dead ends: 164 [2022-04-06 20:31:23,789 INFO L226 Difference]: Without dead ends: 93 [2022-04-06 20:31:23,790 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 117 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=757, Invalid=2783, Unknown=0, NotChecked=0, Total=3540 [2022-04-06 20:31:23,791 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 593 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 20:31:23,791 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 160 Invalid, 648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 593 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 20:31:23,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-04-06 20:31:23,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2022-04-06 20:31:23,809 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) [2022-04-06 20:31:23,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 111 transitions. [2022-04-06 20:31:23,810 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 111 transitions. Word has length 70 [2022-04-06 20:31:23,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:31:23,811 INFO L478 AbstractCegarLoop]: Abstraction has 89 states and 111 transitions. [2022-04-06 20:31:23,811 INFO L479 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) [2022-04-06 20:31:23,811 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 111 transitions. [2022-04-06 20:31:23,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-04-06 20:31:23,811 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:31:23,811 INFO L499 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] [2022-04-06 20:31:23,827 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-04-06 20:31:24,011 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-04-06 20:31:24,012 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:31:24,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:31:24,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1316589984, now seen corresponding path program 25 times [2022-04-06 20:31:24,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:31:24,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1280421001] [2022-04-06 20:31:24,012 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:31:24,013 INFO L85 PathProgramCache]: Analyzing trace with hash -1316589984, now seen corresponding path program 26 times [2022-04-06 20:31:24,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:31:24,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434675360] [2022-04-06 20:31:24,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:31:24,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:31:24,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:24,090 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:31:24,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:24,098 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:31:24,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:24,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2022-04-06 20:31:24,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:24,588 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-06 20:31:24,588 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:31:24,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434675360] [2022-04-06 20:31:24,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434675360] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:31:24,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897184549] [2022-04-06 20:31:24,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:31:24,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:31:24,588 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:31:24,589 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:31:24,590 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-04-06 20:31:25,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:31:25,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:31:25,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 863 conjuncts, 31 conjunts are in the unsatisfiable core [2022-04-06 20:31:25,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:31:25,730 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 199 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-04-06 20:31:25,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:31:26,766 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-06 20:31:26,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897184549] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:31:26,767 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:31:26,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 17] total 48 [2022-04-06 20:31:26,767 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:31:26,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1280421001] [2022-04-06 20:31:26,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1280421001] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:31:26,767 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:31:26,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-04-06 20:31:26,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734054927] [2022-04-06 20:31:26,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:31:26,767 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-04-06 20:31:26,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:31:26,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-04-06 20:31:26,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=539, Invalid=1717, Unknown=0, NotChecked=0, Total=2256 [2022-04-06 20:31:26,768 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) [2022-04-06 20:31:28,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:31:28,198 INFO L93 Difference]: Finished difference Result 166 states and 210 transitions. [2022-04-06 20:31:28,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-04-06 20:31:28,199 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 [2022-04-06 20:31:28,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:31:28,199 INFO L225 Difference]: With dead ends: 166 [2022-04-06 20:31:28,199 INFO L226 Difference]: Without dead ends: 94 [2022-04-06 20:31:28,201 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=854, Invalid=3178, Unknown=0, NotChecked=0, Total=4032 [2022-04-06 20:31:28,201 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 1315 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 1372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 1315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-04-06 20:31:28,201 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 313 Invalid, 1372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 1315 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-04-06 20:31:28,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-04-06 20:31:28,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2022-04-06 20:31:28,223 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) [2022-04-06 20:31:28,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 112 transitions. [2022-04-06 20:31:28,223 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 112 transitions. Word has length 72 [2022-04-06 20:31:28,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:31:28,223 INFO L478 AbstractCegarLoop]: Abstraction has 90 states and 112 transitions. [2022-04-06 20:31:28,223 INFO L479 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) [2022-04-06 20:31:28,223 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 112 transitions. [2022-04-06 20:31:28,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-04-06 20:31:28,224 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:31:28,224 INFO L499 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] [2022-04-06 20:31:28,244 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-04-06 20:31:28,434 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:31:28,435 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:31:28,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:31:28,435 INFO L85 PathProgramCache]: Analyzing trace with hash -286155254, now seen corresponding path program 27 times [2022-04-06 20:31:28,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:31:28,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [521761014] [2022-04-06 20:31:28,435 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:31:28,435 INFO L85 PathProgramCache]: Analyzing trace with hash -286155254, now seen corresponding path program 28 times [2022-04-06 20:31:28,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:31:28,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741013685] [2022-04-06 20:31:28,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:31:28,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:31:28,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:28,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:31:28,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:28,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:31:28,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:29,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2022-04-06 20:31:29,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:29,072 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 0 proven. 332 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2022-04-06 20:31:29,073 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:31:29,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741013685] [2022-04-06 20:31:29,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741013685] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:31:29,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596051093] [2022-04-06 20:31:29,073 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:31:29,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:31:29,073 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:31:29,074 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:31:29,075 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-04-06 20:31:29,614 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:31:29,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:31:29,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 877 conjuncts, 60 conjunts are in the unsatisfiable core [2022-04-06 20:31:29,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:31:30,330 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 47 proven. 375 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 20:31:30,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:31:32,240 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 227 proven. 105 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2022-04-06 20:31:32,240 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596051093] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:31:32,240 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:31:32,240 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 18] total 51 [2022-04-06 20:31:32,240 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:31:32,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [521761014] [2022-04-06 20:31:32,240 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [521761014] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:31:32,240 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:31:32,240 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-04-06 20:31:32,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967199969] [2022-04-06 20:31:32,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:31:32,241 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-04-06 20:31:32,241 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:31:32,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-04-06 20:31:32,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=610, Invalid=1940, Unknown=0, NotChecked=0, Total=2550 [2022-04-06 20:31:32,242 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) [2022-04-06 20:31:33,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:31:33,339 INFO L93 Difference]: Finished difference Result 168 states and 212 transitions. [2022-04-06 20:31:33,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-04-06 20:31:33,340 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 [2022-04-06 20:31:33,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:31:33,340 INFO L225 Difference]: With dead ends: 168 [2022-04-06 20:31:33,340 INFO L226 Difference]: Without dead ends: 95 [2022-04-06 20:31:33,341 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=961, Invalid=3595, Unknown=0, NotChecked=0, Total=4556 [2022-04-06 20:31:33,342 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 576 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 20:31:33,342 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 143 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 576 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 20:31:33,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-04-06 20:31:33,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 91. [2022-04-06 20:31:33,347 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) [2022-04-06 20:31:33,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 113 transitions. [2022-04-06 20:31:33,348 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 113 transitions. Word has length 74 [2022-04-06 20:31:33,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:31:33,348 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 113 transitions. [2022-04-06 20:31:33,348 INFO L479 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) [2022-04-06 20:31:33,348 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 113 transitions. [2022-04-06 20:31:33,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-04-06 20:31:33,348 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:31:33,348 INFO L499 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] [2022-04-06 20:31:33,370 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-04-06 20:31:33,563 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-04-06 20:31:33,563 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:31:33,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:31:33,564 INFO L85 PathProgramCache]: Analyzing trace with hash -1348028000, now seen corresponding path program 29 times [2022-04-06 20:31:33,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:31:33,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [138051643] [2022-04-06 20:31:33,565 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:31:33,565 INFO L85 PathProgramCache]: Analyzing trace with hash -1348028000, now seen corresponding path program 30 times [2022-04-06 20:31:33,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:31:33,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306997670] [2022-04-06 20:31:33,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:31:33,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:31:33,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:33,632 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:31:33,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:33,639 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:31:33,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:34,242 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2022-04-06 20:31:34,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:31:34,266 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-04-06 20:31:34,266 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:31:34,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306997670] [2022-04-06 20:31:34,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306997670] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:31:34,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67760569] [2022-04-06 20:31:34,267 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:31:34,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:31:34,267 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:31:34,268 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:31:34,269 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-04-06 20:32:44,189 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2022-04-06 20:32:44,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:32:44,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 891 conjuncts, 47 conjunts are in the unsatisfiable core [2022-04-06 20:32:44,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:32:45,035 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 259 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-04-06 20:32:45,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:32:46,403 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-04-06 20:32:46,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67760569] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:32:46,403 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:32:46,403 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 19] total 55 [2022-04-06 20:32:46,403 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:32:46,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [138051643] [2022-04-06 20:32:46,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [138051643] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:32:46,403 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:32:46,403 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-04-06 20:32:46,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002949933] [2022-04-06 20:32:46,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:32:46,404 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-04-06 20:32:46,404 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:32:46,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-04-06 20:32:46,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=2289, Unknown=0, NotChecked=0, Total=2970 [2022-04-06 20:32:46,405 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) [2022-04-06 20:32:47,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:32:47,826 INFO L93 Difference]: Finished difference Result 170 states and 214 transitions. [2022-04-06 20:32:47,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-04-06 20:32:47,826 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 [2022-04-06 20:32:47,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:32:47,827 INFO L225 Difference]: With dead ends: 170 [2022-04-06 20:32:47,827 INFO L226 Difference]: Without dead ends: 96 [2022-04-06 20:32:47,828 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 122 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1072, Invalid=4184, Unknown=0, NotChecked=0, Total=5256 [2022-04-06 20:32:47,829 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 763 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 824 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 763 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 20:32:47,829 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 177 Invalid, 824 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 763 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 20:32:47,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-04-06 20:32:47,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2022-04-06 20:32:47,834 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) [2022-04-06 20:32:47,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 114 transitions. [2022-04-06 20:32:47,835 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 114 transitions. Word has length 76 [2022-04-06 20:32:47,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:32:47,835 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 114 transitions. [2022-04-06 20:32:47,835 INFO L479 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) [2022-04-06 20:32:47,835 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 114 transitions. [2022-04-06 20:32:47,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-04-06 20:32:47,836 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:32:47,836 INFO L499 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] [2022-04-06 20:32:47,853 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-04-06 20:32:48,047 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-04-06 20:32:48,047 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:32:48,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:32:48,048 INFO L85 PathProgramCache]: Analyzing trace with hash 286385866, now seen corresponding path program 31 times [2022-04-06 20:32:48,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:32:48,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1669279753] [2022-04-06 20:32:48,048 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:32:48,048 INFO L85 PathProgramCache]: Analyzing trace with hash 286385866, now seen corresponding path program 32 times [2022-04-06 20:32:48,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:32:48,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716564736] [2022-04-06 20:32:48,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:32:48,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:32:48,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:32:48,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:32:48,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:32:48,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:32:48,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:32:48,917 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2022-04-06 20:32:48,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:32:48,959 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 0 proven. 427 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2022-04-06 20:32:48,959 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:32:48,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716564736] [2022-04-06 20:32:48,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716564736] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:32:48,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562977403] [2022-04-06 20:32:48,960 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 20:32:48,960 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:32:48,960 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:32:48,960 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:32:49,002 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-04-06 20:32:49,779 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 20:32:49,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:32:49,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 905 conjuncts, 71 conjunts are in the unsatisfiable core [2022-04-06 20:32:49,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:32:50,604 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 292 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-04-06 20:32:50,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:32:52,157 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 0 proven. 427 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2022-04-06 20:32:52,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562977403] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:32:52,158 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:32:52,158 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20, 20] total 57 [2022-04-06 20:32:52,158 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:32:52,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1669279753] [2022-04-06 20:32:52,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1669279753] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:32:52,158 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:32:52,158 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-04-06 20:32:52,158 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288012984] [2022-04-06 20:32:52,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:32:52,158 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-04-06 20:32:52,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:32:52,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-04-06 20:32:52,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=2439, Unknown=0, NotChecked=0, Total=3192 [2022-04-06 20:32:52,159 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) [2022-04-06 20:32:54,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:32:54,132 INFO L93 Difference]: Finished difference Result 172 states and 216 transitions. [2022-04-06 20:32:54,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-04-06 20:32:54,132 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 [2022-04-06 20:32:54,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:32:54,133 INFO L225 Difference]: With dead ends: 172 [2022-04-06 20:32:54,133 INFO L226 Difference]: Without dead ends: 97 [2022-04-06 20:32:54,135 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1184, Invalid=4516, Unknown=0, NotChecked=0, Total=5700 [2022-04-06 20:32:54,135 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 1337 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 1400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-04-06 20:32:54,135 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 296 Invalid, 1400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1337 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-04-06 20:32:54,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-04-06 20:32:54,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2022-04-06 20:32:54,140 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) [2022-04-06 20:32:54,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 115 transitions. [2022-04-06 20:32:54,141 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 115 transitions. Word has length 78 [2022-04-06 20:32:54,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:32:54,141 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 115 transitions. [2022-04-06 20:32:54,141 INFO L479 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) [2022-04-06 20:32:54,141 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 115 transitions. [2022-04-06 20:32:54,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-04-06 20:32:54,142 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:32:54,142 INFO L499 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] [2022-04-06 20:32:54,177 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-04-06 20:32:54,359 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-04-06 20:32:54,359 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:32:54,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:32:54,360 INFO L85 PathProgramCache]: Analyzing trace with hash -55855904, now seen corresponding path program 33 times [2022-04-06 20:32:54,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:32:54,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [790796291] [2022-04-06 20:32:54,360 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:32:54,360 INFO L85 PathProgramCache]: Analyzing trace with hash -55855904, now seen corresponding path program 34 times [2022-04-06 20:32:54,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:32:54,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660709347] [2022-04-06 20:32:54,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:32:54,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:32:54,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:32:54,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:32:54,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:32:54,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:32:54,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:32:55,550 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2022-04-06 20:32:55,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:32:55,564 INFO L134 CoverageAnalysis]: Checked inductivity of 633 backedges. 0 proven. 479 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-04-06 20:32:55,565 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:32:55,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660709347] [2022-04-06 20:32:55,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660709347] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:32:55,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621381675] [2022-04-06 20:32:55,565 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 20:32:55,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:32:55,565 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:32:55,566 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:32:55,568 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-04-06 20:32:56,131 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 20:32:56,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 20:32:56,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 919 conjuncts, 39 conjunts are in the unsatisfiable core [2022-04-06 20:32:56,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 20:32:57,329 INFO L134 CoverageAnalysis]: Checked inductivity of 633 backedges. 326 proven. 153 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-04-06 20:32:57,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 20:32:59,181 INFO L134 CoverageAnalysis]: Checked inductivity of 633 backedges. 326 proven. 153 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-04-06 20:32:59,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621381675] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 20:32:59,181 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 20:32:59,181 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 21] total 60 [2022-04-06 20:32:59,181 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 20:32:59,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [790796291] [2022-04-06 20:32:59,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [790796291] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 20:32:59,181 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 20:32:59,182 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-04-06 20:32:59,182 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027434657] [2022-04-06 20:32:59,182 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 20:32:59,182 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-04-06 20:32:59,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 20:32:59,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-04-06 20:32:59,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=835, Invalid=2705, Unknown=0, NotChecked=0, Total=3540 [2022-04-06 20:32:59,183 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) [2022-04-06 20:33:01,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 20:33:01,824 INFO L93 Difference]: Finished difference Result 174 states and 218 transitions. [2022-04-06 20:33:01,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-04-06 20:33:01,825 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 [2022-04-06 20:33:01,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 20:33:01,826 INFO L225 Difference]: With dead ends: 174 [2022-04-06 20:33:01,826 INFO L226 Difference]: Without dead ends: 98 [2022-04-06 20:33:01,826 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1310, Invalid=5010, Unknown=0, NotChecked=0, Total=6320 [2022-04-06 20:33:01,827 INFO L913 BasicCegarLoop]: 83 mSDtfsCounter, 83 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 1605 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 1670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 1605 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-04-06 20:33:01,827 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 347 Invalid, 1670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 1605 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-04-06 20:33:01,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-04-06 20:33:01,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 94. [2022-04-06 20:33:01,832 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) [2022-04-06 20:33:01,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 116 transitions. [2022-04-06 20:33:01,833 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 116 transitions. Word has length 80 [2022-04-06 20:33:01,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 20:33:01,833 INFO L478 AbstractCegarLoop]: Abstraction has 94 states and 116 transitions. [2022-04-06 20:33:01,833 INFO L479 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) [2022-04-06 20:33:01,833 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 116 transitions. [2022-04-06 20:33:01,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-04-06 20:33:01,833 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 20:33:01,833 INFO L499 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] [2022-04-06 20:33:01,854 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-04-06 20:33:02,042 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:33:02,043 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 20:33:02,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 20:33:02,043 INFO L85 PathProgramCache]: Analyzing trace with hash 963477386, now seen corresponding path program 35 times [2022-04-06 20:33:02,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 20:33:02,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [88332257] [2022-04-06 20:33:02,043 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 20:33:02,044 INFO L85 PathProgramCache]: Analyzing trace with hash 963477386, now seen corresponding path program 36 times [2022-04-06 20:33:02,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 20:33:02,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683776905] [2022-04-06 20:33:02,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 20:33:02,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 20:33:02,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:33:02,112 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 20:33:02,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:33:02,120 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-04-06 20:33:02,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:33:03,598 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2022-04-06 20:33:03,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 20:33:03,611 INFO L134 CoverageAnalysis]: Checked inductivity of 706 backedges. 0 proven. 534 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2022-04-06 20:33:03,611 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 20:33:03,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683776905] [2022-04-06 20:33:03,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683776905] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 20:33:03,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065011939] [2022-04-06 20:33:03,612 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 20:33:03,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 20:33:03,612 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 20:33:03,613 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 20:33:03,614 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process