./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-simple/deep-nested.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version c3fed411 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loop-simple/deep-nested.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash abddf9ff39262b7e56b56d5272c2d316261bfefbe98fc5849d87d962ab5f7694 --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-17 10:54:49,849 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-17 10:54:49,851 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-17 10:54:49,896 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-17 10:54:49,897 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-17 10:54:49,897 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-17 10:54:49,898 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-17 10:54:49,899 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-17 10:54:49,900 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-17 10:54:49,900 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-17 10:54:49,901 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-17 10:54:49,902 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-17 10:54:49,902 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-17 10:54:49,903 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-17 10:54:49,904 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-17 10:54:49,909 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-17 10:54:49,910 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-17 10:54:49,911 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-17 10:54:49,913 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-17 10:54:49,917 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-17 10:54:49,918 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-17 10:54:49,918 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-17 10:54:49,919 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-17 10:54:49,920 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-17 10:54:49,923 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-17 10:54:49,923 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-17 10:54:49,924 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-17 10:54:49,924 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-17 10:54:49,924 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-17 10:54:49,925 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-17 10:54:49,925 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-17 10:54:49,925 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-17 10:54:49,926 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-17 10:54:49,926 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-17 10:54:49,927 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-17 10:54:49,927 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-17 10:54:49,927 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-17 10:54:49,927 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-17 10:54:49,927 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-17 10:54:49,928 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-17 10:54:49,928 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-17 10:54:49,936 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-17 10:54:49,953 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-17 10:54:49,953 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-17 10:54:49,954 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-17 10:54:49,954 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-17 10:54:49,955 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-17 10:54:49,955 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-17 10:54:49,955 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-17 10:54:49,955 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-17 10:54:49,956 INFO L138 SettingsManager]: * Use SBE=true [2021-12-17 10:54:49,960 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-17 10:54:49,960 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-17 10:54:49,960 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-17 10:54:49,960 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-17 10:54:49,961 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-17 10:54:49,961 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-17 10:54:49,961 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-17 10:54:49,961 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-17 10:54:49,961 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-17 10:54:49,961 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-17 10:54:49,961 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-17 10:54:49,962 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-17 10:54:49,962 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-17 10:54:49,962 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-17 10:54:49,962 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-17 10:54:49,962 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 10:54:49,962 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-17 10:54:49,962 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-17 10:54:49,963 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-17 10:54:49,963 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-17 10:54:49,963 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-17 10:54:49,963 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-17 10:54:49,963 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-17 10:54:49,963 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-17 10:54:49,963 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-17 10:54:49,964 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> abddf9ff39262b7e56b56d5272c2d316261bfefbe98fc5849d87d962ab5f7694 [2021-12-17 10:54:50,114 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-17 10:54:50,134 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-17 10:54:50,137 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-17 10:54:50,137 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-17 10:54:50,138 INFO L275 PluginConnector]: CDTParser initialized [2021-12-17 10:54:50,139 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-simple/deep-nested.c [2021-12-17 10:54:50,184 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/428a6b2d8/9cb91cae105c4774a11524f8a87a0879/FLAGb0d951c59 [2021-12-17 10:54:50,520 INFO L306 CDTParser]: Found 1 translation units. [2021-12-17 10:54:50,521 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-simple/deep-nested.c [2021-12-17 10:54:50,528 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/428a6b2d8/9cb91cae105c4774a11524f8a87a0879/FLAGb0d951c59 [2021-12-17 10:54:50,964 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/428a6b2d8/9cb91cae105c4774a11524f8a87a0879 [2021-12-17 10:54:50,966 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-17 10:54:50,967 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-17 10:54:50,968 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-17 10:54:50,969 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-17 10:54:50,971 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-17 10:54:50,972 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 10:54:50" (1/1) ... [2021-12-17 10:54:50,972 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e507c8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:50, skipping insertion in model container [2021-12-17 10:54:50,973 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.12 10:54:50" (1/1) ... [2021-12-17 10:54:50,977 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-17 10:54:50,986 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-17 10:54:51,094 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-simple/deep-nested.c[625,638] [2021-12-17 10:54:51,099 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 10:54:51,104 INFO L203 MainTranslator]: Completed pre-run [2021-12-17 10:54:51,121 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-simple/deep-nested.c[625,638] [2021-12-17 10:54:51,127 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-17 10:54:51,134 INFO L208 MainTranslator]: Completed translation [2021-12-17 10:54:51,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51 WrapperNode [2021-12-17 10:54:51,135 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-17 10:54:51,136 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-17 10:54:51,136 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-17 10:54:51,136 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-17 10:54:51,147 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (1/1) ... [2021-12-17 10:54:51,153 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (1/1) ... [2021-12-17 10:54:51,168 INFO L137 Inliner]: procedures = 10, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 61 [2021-12-17 10:54:51,168 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-17 10:54:51,169 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-17 10:54:51,170 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-17 10:54:51,170 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-17 10:54:51,175 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (1/1) ... [2021-12-17 10:54:51,175 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (1/1) ... [2021-12-17 10:54:51,183 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (1/1) ... [2021-12-17 10:54:51,184 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (1/1) ... [2021-12-17 10:54:51,190 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (1/1) ... [2021-12-17 10:54:51,200 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (1/1) ... [2021-12-17 10:54:51,201 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (1/1) ... [2021-12-17 10:54:51,205 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-17 10:54:51,206 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-17 10:54:51,206 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-17 10:54:51,206 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-17 10:54:51,207 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (1/1) ... [2021-12-17 10:54:51,211 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-17 10:54:51,219 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:54:51,228 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-17 10:54:51,259 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-17 10:54:51,270 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-17 10:54:51,270 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-17 10:54:51,270 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-17 10:54:51,270 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-17 10:54:51,305 INFO L236 CfgBuilder]: Building ICFG [2021-12-17 10:54:51,306 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-17 10:54:51,381 INFO L277 CfgBuilder]: Performing block encoding [2021-12-17 10:54:51,385 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-17 10:54:51,385 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-12-17 10:54:51,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 10:54:51 BoogieIcfgContainer [2021-12-17 10:54:51,386 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-17 10:54:51,387 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-17 10:54:51,388 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-17 10:54:51,390 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-17 10:54:51,390 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.12 10:54:50" (1/3) ... [2021-12-17 10:54:51,390 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b7b4f9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 10:54:51, skipping insertion in model container [2021-12-17 10:54:51,390 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.12 10:54:51" (2/3) ... [2021-12-17 10:54:51,391 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b7b4f9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.12 10:54:51, skipping insertion in model container [2021-12-17 10:54:51,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.12 10:54:51" (3/3) ... [2021-12-17 10:54:51,391 INFO L111 eAbstractionObserver]: Analyzing ICFG deep-nested.c [2021-12-17 10:54:51,394 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-17 10:54:51,394 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-17 10:54:51,447 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-17 10:54:51,465 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-17 10:54:51,465 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-17 10:54:51,485 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 18 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:51,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-17 10:54:51,488 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:54:51,489 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:54:51,489 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:54:51,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:54:51,492 INFO L85 PathProgramCache]: Analyzing trace with hash -180366952, now seen corresponding path program 1 times [2021-12-17 10:54:51,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:54:51,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204622489] [2021-12-17 10:54:51,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:51,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:54:51,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:51,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:54:51,701 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:54:51,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204622489] [2021-12-17 10:54:51,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204622489] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 10:54:51,704 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-17 10:54:51,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-17 10:54:51,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344292024] [2021-12-17 10:54:51,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 10:54:51,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 10:54:51,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:54:51,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 10:54:51,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-17 10:54:51,736 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 18 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:51,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:54:51,805 INFO L93 Difference]: Finished difference Result 39 states and 62 transitions. [2021-12-17 10:54:51,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-17 10:54:51,807 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-12-17 10:54:51,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:54:51,816 INFO L225 Difference]: With dead ends: 39 [2021-12-17 10:54:51,816 INFO L226 Difference]: Without dead ends: 18 [2021-12-17 10:54:51,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-17 10:54:51,822 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 21 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 10:54:51,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 20 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 10:54:51,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-12-17 10:54:51,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-12-17 10:54:51,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:51,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-12-17 10:54:51,845 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2021-12-17 10:54:51,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:54:51,845 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-12-17 10:54:51,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:51,845 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-12-17 10:54:51,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-17 10:54:51,846 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:54:51,846 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:54:51,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-17 10:54:51,847 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:54:51,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:54:51,851 INFO L85 PathProgramCache]: Analyzing trace with hash -303894894, now seen corresponding path program 1 times [2021-12-17 10:54:51,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:54:51,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927915395] [2021-12-17 10:54:51,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:51,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:54:51,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:51,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:54:51,975 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:54:51,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927915395] [2021-12-17 10:54:51,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927915395] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:54:51,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161988021] [2021-12-17 10:54:51,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:51,976 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:51,976 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:54:51,978 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:54:52,005 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-17 10:54:52,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:52,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-17 10:54:52,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:54:52,171 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:54:52,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:54:52,306 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-17 10:54:52,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161988021] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:54:52,306 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:54:52,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 11 [2021-12-17 10:54:52,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788083631] [2021-12-17 10:54:52,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:54:52,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-17 10:54:52,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:54:52,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-17 10:54:52,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-12-17 10:54:52,309 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:52,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:54:52,695 INFO L93 Difference]: Finished difference Result 80 states and 108 transitions. [2021-12-17 10:54:52,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-17 10:54:52,695 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-12-17 10:54:52,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:54:52,696 INFO L225 Difference]: With dead ends: 80 [2021-12-17 10:54:52,696 INFO L226 Difference]: Without dead ends: 78 [2021-12-17 10:54:52,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=95, Invalid=247, Unknown=0, NotChecked=0, Total=342 [2021-12-17 10:54:52,697 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 123 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 10:54:52,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 37 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 10:54:52,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-17 10:54:52,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 36. [2021-12-17 10:54:52,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 35 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:52,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2021-12-17 10:54:52,704 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 12 [2021-12-17 10:54:52,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:54:52,704 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2021-12-17 10:54:52,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:52,705 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2021-12-17 10:54:52,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-17 10:54:52,705 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:54:52,706 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:54:52,722 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-17 10:54:52,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:52,920 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:54:52,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:54:52,920 INFO L85 PathProgramCache]: Analyzing trace with hash -300219110, now seen corresponding path program 1 times [2021-12-17 10:54:52,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:54:52,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215504930] [2021-12-17 10:54:52,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:52,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:54:52,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:53,028 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-17 10:54:53,028 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:54:53,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215504930] [2021-12-17 10:54:53,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215504930] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:54:53,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224438414] [2021-12-17 10:54:53,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:53,029 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:53,029 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:54:53,030 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:54:53,031 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-17 10:54:53,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:53,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-17 10:54:53,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:54:53,105 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-12-17 10:54:53,105 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 10:54:53,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224438414] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 10:54:53,106 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-17 10:54:53,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-12-17 10:54:53,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707495098] [2021-12-17 10:54:53,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 10:54:53,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 10:54:53,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:54:53,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 10:54:53,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-17 10:54:53,107 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:53,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:54:53,151 INFO L93 Difference]: Finished difference Result 91 states and 120 transitions. [2021-12-17 10:54:53,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-17 10:54:53,151 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-17 10:54:53,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:54:53,152 INFO L225 Difference]: With dead ends: 91 [2021-12-17 10:54:53,152 INFO L226 Difference]: Without dead ends: 68 [2021-12-17 10:54:53,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-17 10:54:53,153 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 49 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 10:54:53,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 18 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 10:54:53,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-12-17 10:54:53,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 38. [2021-12-17 10:54:53,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 37 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:53,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 49 transitions. [2021-12-17 10:54:53,159 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 49 transitions. Word has length 24 [2021-12-17 10:54:53,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:54:53,159 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 49 transitions. [2021-12-17 10:54:53,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:53,160 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 49 transitions. [2021-12-17 10:54:53,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-17 10:54:53,160 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:54:53,160 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:54:53,178 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-17 10:54:53,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-12-17 10:54:53,379 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:54:53,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:54:53,380 INFO L85 PathProgramCache]: Analyzing trace with hash 2053128687, now seen corresponding path program 1 times [2021-12-17 10:54:53,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:54:53,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217487316] [2021-12-17 10:54:53,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:53,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:54:53,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:53,520 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-17 10:54:53,520 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:54:53,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217487316] [2021-12-17 10:54:53,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217487316] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:54:53,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822515319] [2021-12-17 10:54:53,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:53,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:53,521 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:54:53,522 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:54:53,540 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-17 10:54:53,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:53,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-17 10:54:53,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:54:53,632 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-17 10:54:53,632 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 10:54:53,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822515319] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 10:54:53,633 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-17 10:54:53,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-12-17 10:54:53,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264787200] [2021-12-17 10:54:53,633 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 10:54:53,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-17 10:54:53,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:54:53,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-17 10:54:53,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-12-17 10:54:53,634 INFO L87 Difference]: Start difference. First operand 38 states and 49 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:53,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:54:53,694 INFO L93 Difference]: Finished difference Result 100 states and 131 transitions. [2021-12-17 10:54:53,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-17 10:54:53,695 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-12-17 10:54:53,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:54:53,697 INFO L225 Difference]: With dead ends: 100 [2021-12-17 10:54:53,697 INFO L226 Difference]: Without dead ends: 66 [2021-12-17 10:54:53,698 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-12-17 10:54:53,700 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 88 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 10:54:53,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 16 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 10:54:53,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-12-17 10:54:53,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 40. [2021-12-17 10:54:53,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:53,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 51 transitions. [2021-12-17 10:54:53,713 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 51 transitions. Word has length 27 [2021-12-17 10:54:53,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:54:53,713 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 51 transitions. [2021-12-17 10:54:53,714 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:53,715 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 51 transitions. [2021-12-17 10:54:53,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-17 10:54:53,715 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:54:53,716 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:54:53,745 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-17 10:54:53,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:53,933 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:54:53,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:54:53,933 INFO L85 PathProgramCache]: Analyzing trace with hash 1169919440, now seen corresponding path program 1 times [2021-12-17 10:54:53,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:54:53,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632836389] [2021-12-17 10:54:53,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:53,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:54:53,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:54,035 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-17 10:54:54,036 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:54:54,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632836389] [2021-12-17 10:54:54,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [632836389] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:54:54,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768966501] [2021-12-17 10:54:54,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:54,037 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:54,037 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:54:54,038 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:54:54,051 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-17 10:54:54,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:54,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-17 10:54:54,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:54:54,138 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 10:54:54,138 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 10:54:54,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768966501] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 10:54:54,139 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-17 10:54:54,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-12-17 10:54:54,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155298555] [2021-12-17 10:54:54,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 10:54:54,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-17 10:54:54,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:54:54,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-17 10:54:54,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-12-17 10:54:54,140 INFO L87 Difference]: Start difference. First operand 40 states and 51 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:54,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:54:54,192 INFO L93 Difference]: Finished difference Result 84 states and 108 transitions. [2021-12-17 10:54:54,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-17 10:54:54,192 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-12-17 10:54:54,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:54:54,193 INFO L225 Difference]: With dead ends: 84 [2021-12-17 10:54:54,193 INFO L226 Difference]: Without dead ends: 48 [2021-12-17 10:54:54,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-12-17 10:54:54,194 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 67 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 10:54:54,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 16 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 10:54:54,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-17 10:54:54,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2021-12-17 10:54:54,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.275) internal successors, (51), 40 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:54,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 51 transitions. [2021-12-17 10:54:54,198 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 51 transitions. Word has length 30 [2021-12-17 10:54:54,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:54:54,199 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 51 transitions. [2021-12-17 10:54:54,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:54,199 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 51 transitions. [2021-12-17 10:54:54,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-17 10:54:54,200 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:54:54,200 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-17 10:54:54,215 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-17 10:54:54,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:54,416 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:54:54,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:54:54,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1349858359, now seen corresponding path program 2 times [2021-12-17 10:54:54,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:54:54,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213866188] [2021-12-17 10:54:54,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:54,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:54:54,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:54,544 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-17 10:54:54,544 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:54:54,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213866188] [2021-12-17 10:54:54,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213866188] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:54:54,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [738173993] [2021-12-17 10:54:54,545 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 10:54:54,545 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:54,545 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:54:54,560 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:54:54,607 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-17 10:54:54,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-12-17 10:54:54,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:54:54,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-17 10:54:54,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:54:54,748 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-17 10:54:54,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 10:54:54,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [738173993] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 10:54:54,749 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-17 10:54:54,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 9 [2021-12-17 10:54:54,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300180392] [2021-12-17 10:54:54,749 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 10:54:54,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 10:54:54,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:54:54,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 10:54:54,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-12-17 10:54:54,750 INFO L87 Difference]: Start difference. First operand 41 states and 51 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:54,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:54:54,774 INFO L93 Difference]: Finished difference Result 73 states and 91 transitions. [2021-12-17 10:54:54,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-17 10:54:54,775 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-12-17 10:54:54,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:54:54,775 INFO L225 Difference]: With dead ends: 73 [2021-12-17 10:54:54,775 INFO L226 Difference]: Without dead ends: 71 [2021-12-17 10:54:54,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-12-17 10:54:54,776 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 10:54:54,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 13 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 10:54:54,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-12-17 10:54:54,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 51. [2021-12-17 10:54:54,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.28) internal successors, (64), 50 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:54,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2021-12-17 10:54:54,782 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 36 [2021-12-17 10:54:54,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:54:54,782 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2021-12-17 10:54:54,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:54,782 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2021-12-17 10:54:54,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-17 10:54:54,783 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:54:54,784 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-17 10:54:54,802 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-17 10:54:55,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:55,000 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:54:55,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:54:55,000 INFO L85 PathProgramCache]: Analyzing trace with hash 661403962, now seen corresponding path program 3 times [2021-12-17 10:54:55,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:54:55,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106974656] [2021-12-17 10:54:55,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:55,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:54:55,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:55,124 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 13 proven. 28 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-12-17 10:54:55,124 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:54:55,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106974656] [2021-12-17 10:54:55,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2106974656] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:54:55,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1233806902] [2021-12-17 10:54:55,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-17 10:54:55,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:55,125 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:54:55,144 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:54:55,183 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-17 10:54:55,185 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-12-17 10:54:55,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:54:55,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-17 10:54:55,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:54:55,333 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-12-17 10:54:55,333 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-17 10:54:55,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1233806902] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-17 10:54:55,333 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-17 10:54:55,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 9 [2021-12-17 10:54:55,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230993886] [2021-12-17 10:54:55,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-17 10:54:55,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-17 10:54:55,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:54:55,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-17 10:54:55,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-12-17 10:54:55,335 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:55,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:54:55,359 INFO L93 Difference]: Finished difference Result 85 states and 106 transitions. [2021-12-17 10:54:55,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-17 10:54:55,360 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-12-17 10:54:55,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:54:55,360 INFO L225 Difference]: With dead ends: 85 [2021-12-17 10:54:55,360 INFO L226 Difference]: Without dead ends: 83 [2021-12-17 10:54:55,361 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-12-17 10:54:55,361 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 3 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-17 10:54:55,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 13 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-17 10:54:55,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-12-17 10:54:55,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 58. [2021-12-17 10:54:55,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.280701754385965) internal successors, (73), 57 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:55,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 73 transitions. [2021-12-17 10:54:55,380 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 73 transitions. Word has length 48 [2021-12-17 10:54:55,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:54:55,380 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 73 transitions. [2021-12-17 10:54:55,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:55,380 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 73 transitions. [2021-12-17 10:54:55,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-17 10:54:55,381 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:54:55,381 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-17 10:54:55,415 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-17 10:54:55,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:55,596 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:54:55,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:54:55,596 INFO L85 PathProgramCache]: Analyzing trace with hash -1257114416, now seen corresponding path program 4 times [2021-12-17 10:54:55,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:54:55,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699981044] [2021-12-17 10:54:55,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:55,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:54:55,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:55,749 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 16 proven. 35 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-12-17 10:54:55,750 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:54:55,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699981044] [2021-12-17 10:54:55,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699981044] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:54:55,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1811144028] [2021-12-17 10:54:55,750 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-17 10:54:55,750 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:55,750 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:54:55,755 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-17 10:54:55,757 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-17 10:54:55,808 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-17 10:54:55,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:54:55,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-17 10:54:55,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:54:55,933 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 99 proven. 2 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-12-17 10:54:55,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:54:56,087 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 98 proven. 3 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-12-17 10:54:56,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1811144028] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:54:56,088 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:54:56,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2021-12-17 10:54:56,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099793107] [2021-12-17 10:54:56,088 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:54:56,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-17 10:54:56,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:54:56,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-17 10:54:56,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-12-17 10:54:56,090 INFO L87 Difference]: Start difference. First operand 58 states and 73 transitions. Second operand has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 17 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:56,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:54:56,789 INFO L93 Difference]: Finished difference Result 233 states and 305 transitions. [2021-12-17 10:54:56,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-17 10:54:56,790 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 17 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-12-17 10:54:56,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:54:56,790 INFO L225 Difference]: With dead ends: 233 [2021-12-17 10:54:56,790 INFO L226 Difference]: Without dead ends: 125 [2021-12-17 10:54:56,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=245, Invalid=877, Unknown=0, NotChecked=0, Total=1122 [2021-12-17 10:54:56,791 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 210 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 10:54:56,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 72 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 10:54:56,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-12-17 10:54:56,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 99. [2021-12-17 10:54:56,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.1938775510204083) internal successors, (117), 98 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:56,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 117 transitions. [2021-12-17 10:54:56,821 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 117 transitions. Word has length 57 [2021-12-17 10:54:56,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:54:56,822 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 117 transitions. [2021-12-17 10:54:56,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.294117647058823) internal successors, (73), 17 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:56,822 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 117 transitions. [2021-12-17 10:54:56,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-12-17 10:54:56,827 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:54:56,827 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-17 10:54:56,848 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-12-17 10:54:57,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:57,044 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:54:57,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:54:57,044 INFO L85 PathProgramCache]: Analyzing trace with hash 722891500, now seen corresponding path program 5 times [2021-12-17 10:54:57,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:54:57,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089469884] [2021-12-17 10:54:57,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:57,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:54:57,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:57,206 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 16 proven. 141 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-12-17 10:54:57,207 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:54:57,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089469884] [2021-12-17 10:54:57,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089469884] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:54:57,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1572672118] [2021-12-17 10:54:57,207 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-17 10:54:57,207 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:57,207 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:54:57,208 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) [2021-12-17 10:54:57,249 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-17 10:54:57,316 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-17 10:54:57,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:54:57,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-17 10:54:57,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:54:57,461 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 186 proven. 18 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2021-12-17 10:54:57,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:54:57,632 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 186 proven. 18 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2021-12-17 10:54:57,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1572672118] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:54:57,633 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:54:57,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 18 [2021-12-17 10:54:57,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215164677] [2021-12-17 10:54:57,633 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:54:57,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-17 10:54:57,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:54:57,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-17 10:54:57,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-12-17 10:54:57,634 INFO L87 Difference]: Start difference. First operand 99 states and 117 transitions. Second operand has 18 states, 18 states have (on average 4.666666666666667) internal successors, (84), 18 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:58,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:54:58,518 INFO L93 Difference]: Finished difference Result 530 states and 658 transitions. [2021-12-17 10:54:58,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-17 10:54:58,519 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.666666666666667) internal successors, (84), 18 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-12-17 10:54:58,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:54:58,520 INFO L225 Difference]: With dead ends: 530 [2021-12-17 10:54:58,520 INFO L226 Difference]: Without dead ends: 330 [2021-12-17 10:54:58,521 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=335, Invalid=1471, Unknown=0, NotChecked=0, Total=1806 [2021-12-17 10:54:58,522 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 253 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 453 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 453 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-17 10:54:58,522 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [253 Valid, 97 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 453 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-17 10:54:58,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2021-12-17 10:54:58,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 160. [2021-12-17 10:54:58,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 1.119496855345912) internal successors, (178), 159 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:58,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 178 transitions. [2021-12-17 10:54:58,536 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 178 transitions. Word has length 78 [2021-12-17 10:54:58,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:54:58,536 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 178 transitions. [2021-12-17 10:54:58,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.666666666666667) internal successors, (84), 18 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:54:58,537 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 178 transitions. [2021-12-17 10:54:58,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-12-17 10:54:58,538 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:54:58,538 INFO L514 BasicCegarLoop]: trace histogram [37, 36, 36, 9, 8, 8, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-17 10:54:58,544 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-17 10:54:58,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-12-17 10:54:58,743 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:54:58,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:54:58,743 INFO L85 PathProgramCache]: Analyzing trace with hash 1550504784, now seen corresponding path program 6 times [2021-12-17 10:54:58,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:54:58,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594984825] [2021-12-17 10:54:58,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:54:58,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:54:58,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:54:59,055 INFO L134 CoverageAnalysis]: Checked inductivity of 2406 backedges. 20 proven. 514 refuted. 0 times theorem prover too weak. 1872 trivial. 0 not checked. [2021-12-17 10:54:59,055 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:54:59,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594984825] [2021-12-17 10:54:59,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594984825] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:54:59,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052936234] [2021-12-17 10:54:59,056 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-17 10:54:59,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:54:59,056 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:54:59,057 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) [2021-12-17 10:54:59,101 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-17 10:54:59,109 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-12-17 10:54:59,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:54:59,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-17 10:54:59,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:54:59,525 INFO L134 CoverageAnalysis]: Checked inductivity of 2406 backedges. 1218 proven. 364 refuted. 0 times theorem prover too weak. 824 trivial. 0 not checked. [2021-12-17 10:54:59,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:54:59,839 INFO L134 CoverageAnalysis]: Checked inductivity of 2406 backedges. 0 proven. 1582 refuted. 0 times theorem prover too weak. 824 trivial. 0 not checked. [2021-12-17 10:54:59,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052936234] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:54:59,839 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:54:59,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5] total 16 [2021-12-17 10:54:59,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450837766] [2021-12-17 10:54:59,840 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:54:59,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-17 10:54:59,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:54:59,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-17 10:54:59,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2021-12-17 10:54:59,842 INFO L87 Difference]: Start difference. First operand 160 states and 178 transitions. Second operand has 16 states, 16 states have (on average 6.5625) internal successors, (105), 16 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:55:00,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:55:00,651 INFO L93 Difference]: Finished difference Result 988 states and 1148 transitions. [2021-12-17 10:55:00,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-12-17 10:55:00,651 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 6.5625) internal successors, (105), 16 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 159 [2021-12-17 10:55:00,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:55:00,654 INFO L225 Difference]: With dead ends: 988 [2021-12-17 10:55:00,654 INFO L226 Difference]: Without dead ends: 832 [2021-12-17 10:55:00,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 313 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 610 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=604, Invalid=1748, Unknown=0, NotChecked=0, Total=2352 [2021-12-17 10:55:00,657 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 231 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-17 10:55:00,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [231 Valid, 54 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-17 10:55:00,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 832 states. [2021-12-17 10:55:00,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 832 to 439. [2021-12-17 10:55:00,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 439 states, 438 states have (on average 1.082191780821918) internal successors, (474), 438 states have internal predecessors, (474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:55:00,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 439 states to 439 states and 474 transitions. [2021-12-17 10:55:00,709 INFO L78 Accepts]: Start accepts. Automaton has 439 states and 474 transitions. Word has length 159 [2021-12-17 10:55:00,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:55:00,710 INFO L470 AbstractCegarLoop]: Abstraction has 439 states and 474 transitions. [2021-12-17 10:55:00,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.5625) internal successors, (105), 16 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:55:00,710 INFO L276 IsEmpty]: Start isEmpty. Operand 439 states and 474 transitions. [2021-12-17 10:55:00,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 439 [2021-12-17 10:55:00,718 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:55:00,718 INFO L514 BasicCegarLoop]: trace histogram [115, 114, 114, 19, 18, 18, 9, 8, 8, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-17 10:55:00,737 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-17 10:55:00,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-17 10:55:00,935 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:55:00,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:55:00,935 INFO L85 PathProgramCache]: Analyzing trace with hash 1771881509, now seen corresponding path program 7 times [2021-12-17 10:55:00,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:55:00,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322164278] [2021-12-17 10:55:00,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:55:00,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:55:01,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:55:01,583 INFO L134 CoverageAnalysis]: Checked inductivity of 22369 backedges. 40 proven. 2343 refuted. 0 times theorem prover too weak. 19986 trivial. 0 not checked. [2021-12-17 10:55:01,583 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:55:01,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322164278] [2021-12-17 10:55:01,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322164278] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:55:01,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315981795] [2021-12-17 10:55:01,584 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-17 10:55:01,584 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:55:01,584 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:55:01,585 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) [2021-12-17 10:55:01,617 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-17 10:55:01,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:55:01,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-17 10:55:01,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:55:02,276 INFO L134 CoverageAnalysis]: Checked inductivity of 22369 backedges. 4244 proven. 158 refuted. 0 times theorem prover too weak. 17967 trivial. 0 not checked. [2021-12-17 10:55:02,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:55:02,869 INFO L134 CoverageAnalysis]: Checked inductivity of 22369 backedges. 4244 proven. 158 refuted. 0 times theorem prover too weak. 17967 trivial. 0 not checked. [2021-12-17 10:55:02,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315981795] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:55:02,872 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:55:02,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 26 [2021-12-17 10:55:02,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273170565] [2021-12-17 10:55:02,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:55:02,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-17 10:55:02,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:55:02,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-17 10:55:02,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-12-17 10:55:02,874 INFO L87 Difference]: Start difference. First operand 439 states and 474 transitions. Second operand has 26 states, 26 states have (on average 4.0) internal successors, (104), 26 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:55:07,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:55:07,612 INFO L93 Difference]: Finished difference Result 2204 states and 2537 transitions. [2021-12-17 10:55:07,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-12-17 10:55:07,612 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.0) internal successors, (104), 26 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 438 [2021-12-17 10:55:07,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:55:07,617 INFO L225 Difference]: With dead ends: 2204 [2021-12-17 10:55:07,617 INFO L226 Difference]: Without dead ends: 1769 [2021-12-17 10:55:07,620 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 956 GetRequests, 863 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2829 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1425, Invalid=7505, Unknown=0, NotChecked=0, Total=8930 [2021-12-17 10:55:07,620 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 567 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 1013 mSolverCounterSat, 297 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 567 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 1310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 297 IncrementalHoareTripleChecker+Valid, 1013 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-17 10:55:07,620 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [567 Valid, 86 Invalid, 1310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [297 Valid, 1013 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-12-17 10:55:07,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1769 states. [2021-12-17 10:55:07,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1769 to 1581. [2021-12-17 10:55:07,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1581 states, 1580 states have (on average 1.0449367088607595) internal successors, (1651), 1580 states have internal predecessors, (1651), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:55:07,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1581 states to 1581 states and 1651 transitions. [2021-12-17 10:55:07,735 INFO L78 Accepts]: Start accepts. Automaton has 1581 states and 1651 transitions. Word has length 438 [2021-12-17 10:55:07,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:55:07,736 INFO L470 AbstractCegarLoop]: Abstraction has 1581 states and 1651 transitions. [2021-12-17 10:55:07,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.0) internal successors, (104), 26 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:55:07,736 INFO L276 IsEmpty]: Start isEmpty. Operand 1581 states and 1651 transitions. [2021-12-17 10:55:07,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1579 [2021-12-17 10:55:07,781 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:55:07,781 INFO L514 BasicCegarLoop]: trace histogram [460, 459, 459, 54, 53, 53, 9, 8, 8, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-17 10:55:07,799 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-17 10:55:07,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-17 10:55:08,001 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:55:08,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:55:08,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1725684432, now seen corresponding path program 8 times [2021-12-17 10:55:08,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:55:08,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615036997] [2021-12-17 10:55:08,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:55:08,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:55:09,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:55:10,954 INFO L134 CoverageAnalysis]: Checked inductivity of 345369 backedges. 75 proven. 13706 refuted. 0 times theorem prover too weak. 331588 trivial. 0 not checked. [2021-12-17 10:55:10,955 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:55:10,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615036997] [2021-12-17 10:55:10,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [615036997] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:55:10,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078829625] [2021-12-17 10:55:10,955 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-17 10:55:10,955 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:55:10,956 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:55:10,956 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) [2021-12-17 10:55:10,987 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-17 10:55:11,352 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-17 10:55:11,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:55:11,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 2273 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-17 10:55:11,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:55:13,738 INFO L134 CoverageAnalysis]: Checked inductivity of 345369 backedges. 119626 proven. 8903 refuted. 0 times theorem prover too weak. 216840 trivial. 0 not checked. [2021-12-17 10:55:13,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:55:15,484 INFO L134 CoverageAnalysis]: Checked inductivity of 345369 backedges. 119620 proven. 8909 refuted. 0 times theorem prover too weak. 216840 trivial. 0 not checked. [2021-12-17 10:55:15,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078829625] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:55:15,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:55:15,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 9, 9] total 29 [2021-12-17 10:55:15,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32652145] [2021-12-17 10:55:15,485 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:55:15,486 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-17 10:55:15,487 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:55:15,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-17 10:55:15,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=717, Unknown=0, NotChecked=0, Total=812 [2021-12-17 10:55:15,487 INFO L87 Difference]: Start difference. First operand 1581 states and 1651 transitions. Second operand has 29 states, 29 states have (on average 4.344827586206897) internal successors, (126), 29 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:55:22,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:55:22,847 INFO L93 Difference]: Finished difference Result 6102 states and 6715 transitions. [2021-12-17 10:55:22,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-12-17 10:55:22,848 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 4.344827586206897) internal successors, (126), 29 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 1578 [2021-12-17 10:55:22,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:55:22,858 INFO L225 Difference]: With dead ends: 6102 [2021-12-17 10:55:22,858 INFO L226 Difference]: Without dead ends: 4525 [2021-12-17 10:55:22,862 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3257 GetRequests, 3143 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4356 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=1899, Invalid=11441, Unknown=0, NotChecked=0, Total=13340 [2021-12-17 10:55:22,863 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 820 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 1886 mSolverCounterSat, 379 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 820 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 2265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 379 IncrementalHoareTripleChecker+Valid, 1886 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-12-17 10:55:22,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [820 Valid, 137 Invalid, 2265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [379 Valid, 1886 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-12-17 10:55:22,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4525 states. [2021-12-17 10:55:23,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4525 to 4121. [2021-12-17 10:55:23,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4121 states, 4120 states have (on average 1.0320388349514562) internal successors, (4252), 4120 states have internal predecessors, (4252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:55:23,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4121 states to 4121 states and 4252 transitions. [2021-12-17 10:55:23,138 INFO L78 Accepts]: Start accepts. Automaton has 4121 states and 4252 transitions. Word has length 1578 [2021-12-17 10:55:23,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:55:23,139 INFO L470 AbstractCegarLoop]: Abstraction has 4121 states and 4252 transitions. [2021-12-17 10:55:23,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 4.344827586206897) internal successors, (126), 29 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:55:23,139 INFO L276 IsEmpty]: Start isEmpty. Operand 4121 states and 4252 transitions. [2021-12-17 10:55:23,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4117 [2021-12-17 10:55:23,199 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:55:23,199 INFO L514 BasicCegarLoop]: trace histogram [1243, 1242, 1242, 108, 107, 107, 18, 17, 17, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-12-17 10:55:23,220 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-17 10:55:23,414 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-17 10:55:23,414 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:55:23,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:55:23,415 INFO L85 PathProgramCache]: Analyzing trace with hash -2089192947, now seen corresponding path program 9 times [2021-12-17 10:55:23,415 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:55:23,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236236412] [2021-12-17 10:55:23,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:55:23,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:55:34,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:55:37,400 INFO L134 CoverageAnalysis]: Checked inductivity of 2466894 backedges. 147 proven. 48353 refuted. 0 times theorem prover too weak. 2418394 trivial. 0 not checked. [2021-12-17 10:55:37,401 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:55:37,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236236412] [2021-12-17 10:55:37,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236236412] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:55:37,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026360272] [2021-12-17 10:55:37,401 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-17 10:55:37,401 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:55:37,402 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:55:37,403 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) [2021-12-17 10:55:37,403 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-17 10:55:37,619 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-12-17 10:55:37,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:55:37,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-17 10:55:37,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:55:49,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2466894 backedges. 1097202 proven. 548761 refuted. 0 times theorem prover too weak. 820931 trivial. 0 not checked. [2021-12-17 10:55:49,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:55:58,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2466894 backedges. 0 proven. 1645963 refuted. 0 times theorem prover too weak. 820931 trivial. 0 not checked. [2021-12-17 10:55:58,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026360272] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:55:58,654 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:55:58,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 5, 5] total 24 [2021-12-17 10:55:58,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363575742] [2021-12-17 10:55:58,655 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:55:58,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-17 10:55:58,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:55:58,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-17 10:55:58,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-12-17 10:55:58,659 INFO L87 Difference]: Start difference. First operand 4121 states and 4252 transitions. Second operand has 24 states, 24 states have (on average 5.875) internal successors, (141), 24 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:56:02,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:56:02,341 INFO L93 Difference]: Finished difference Result 21254 states and 22738 transitions. [2021-12-17 10:56:02,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-12-17 10:56:02,341 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.875) internal successors, (141), 24 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4116 [2021-12-17 10:56:02,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:56:02,379 INFO L225 Difference]: With dead ends: 21254 [2021-12-17 10:56:02,380 INFO L226 Difference]: Without dead ends: 17137 [2021-12-17 10:56:02,391 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8322 GetRequests, 8227 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2806 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1412, Invalid=7900, Unknown=0, NotChecked=0, Total=9312 [2021-12-17 10:56:02,391 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 477 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 1308 mSolverCounterSat, 222 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 477 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 1530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 222 IncrementalHoareTripleChecker+Valid, 1308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-17 10:56:02,392 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [477 Valid, 77 Invalid, 1530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [222 Valid, 1308 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-17 10:56:02,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17137 states. [2021-12-17 10:56:03,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17137 to 11495. [2021-12-17 10:56:03,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11495 states, 11494 states have (on average 1.0266225856968854) internal successors, (11800), 11494 states have internal predecessors, (11800), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:56:03,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11495 states to 11495 states and 11800 transitions. [2021-12-17 10:56:03,029 INFO L78 Accepts]: Start accepts. Automaton has 11495 states and 11800 transitions. Word has length 4116 [2021-12-17 10:56:03,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:56:03,030 INFO L470 AbstractCegarLoop]: Abstraction has 11495 states and 11800 transitions. [2021-12-17 10:56:03,030 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.875) internal successors, (141), 24 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:56:03,030 INFO L276 IsEmpty]: Start isEmpty. Operand 11495 states and 11800 transitions. [2021-12-17 10:56:03,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11491 [2021-12-17 10:56:03,499 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:56:03,502 INFO L514 BasicCegarLoop]: trace histogram [3529, 3528, 3528, 252, 251, 251, 42, 41, 41, 7, 6, 6, 2, 1, 1, 1, 1, 1, 1] [2021-12-17 10:56:03,519 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-17 10:56:03,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-17 10:56:03,709 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:56:03,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:56:03,710 INFO L85 PathProgramCache]: Analyzing trace with hash 910590291, now seen corresponding path program 10 times [2021-12-17 10:56:03,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:56:03,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190361464] [2021-12-17 10:56:03,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:56:03,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 10:58:06,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-17 10:58:22,857 INFO L134 CoverageAnalysis]: Checked inductivity of 19665239 backedges. 347 proven. 158682 refuted. 0 times theorem prover too weak. 19506210 trivial. 0 not checked. [2021-12-17 10:58:22,857 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-17 10:58:22,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190361464] [2021-12-17 10:58:22,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190361464] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-17 10:58:22,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867894064] [2021-12-17 10:58:22,858 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-17 10:58:22,858 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-17 10:58:22,858 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-17 10:58:22,861 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) [2021-12-17 10:58:22,862 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-17 10:58:26,110 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-17 10:58:26,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-17 10:58:26,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 15959 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-17 10:58:26,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-17 10:58:42,669 INFO L134 CoverageAnalysis]: Checked inductivity of 19665239 backedges. 8028667 proven. 806405 refuted. 0 times theorem prover too weak. 10830167 trivial. 0 not checked. [2021-12-17 10:58:42,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-17 10:58:57,595 INFO L134 CoverageAnalysis]: Checked inductivity of 19665239 backedges. 8028620 proven. 806452 refuted. 0 times theorem prover too weak. 10830167 trivial. 0 not checked. [2021-12-17 10:58:57,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867894064] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-17 10:58:57,595 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-17 10:58:57,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 9, 9] total 34 [2021-12-17 10:58:57,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146286729] [2021-12-17 10:58:57,598 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-17 10:58:57,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-17 10:58:57,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-17 10:58:57,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-17 10:58:57,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1007, Unknown=0, NotChecked=0, Total=1122 [2021-12-17 10:58:57,606 INFO L87 Difference]: Start difference. First operand 11495 states and 11800 transitions. Second operand has 34 states, 34 states have (on average 4.5) internal successors, (153), 34 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:59:10,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-17 10:59:10,212 INFO L93 Difference]: Finished difference Result 36025 states and 38202 transitions. [2021-12-17 10:59:10,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-12-17 10:59:10,212 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 4.5) internal successors, (153), 34 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11490 [2021-12-17 10:59:10,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-17 10:59:10,256 INFO L225 Difference]: With dead ends: 36025 [2021-12-17 10:59:10,256 INFO L226 Difference]: Without dead ends: 24579 [2021-12-17 10:59:10,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23116 GetRequests, 22967 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7621 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=2689, Invalid=19961, Unknown=0, NotChecked=0, Total=22650 [2021-12-17 10:59:10,273 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 1246 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 3148 mSolverCounterSat, 543 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1246 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 3691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 543 IncrementalHoareTripleChecker+Valid, 3148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-12-17 10:59:10,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1246 Valid, 144 Invalid, 3691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [543 Valid, 3148 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-12-17 10:59:10,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24579 states. [2021-12-17 10:59:11,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24579 to 22942. [2021-12-17 10:59:11,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22942 states, 22941 states have (on average 1.0226232509480842) internal successors, (23460), 22941 states have internal predecessors, (23460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:59:11,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22942 states to 22942 states and 23460 transitions. [2021-12-17 10:59:11,884 INFO L78 Accepts]: Start accepts. Automaton has 22942 states and 23460 transitions. Word has length 11490 [2021-12-17 10:59:11,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-17 10:59:11,885 INFO L470 AbstractCegarLoop]: Abstraction has 22942 states and 23460 transitions. [2021-12-17 10:59:11,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 4.5) internal successors, (153), 34 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-17 10:59:11,886 INFO L276 IsEmpty]: Start isEmpty. Operand 22942 states and 23460 transitions. [2021-12-17 10:59:13,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22936 [2021-12-17 10:59:13,830 INFO L506 BasicCegarLoop]: Found error trace [2021-12-17 10:59:13,835 INFO L514 BasicCegarLoop]: trace histogram [7129, 7128, 7128, 432, 431, 431, 72, 71, 71, 12, 11, 11, 2, 1, 1, 1, 1, 1, 1] [2021-12-17 10:59:13,892 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-17 10:59:14,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-17 10:59:14,041 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-17 10:59:14,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-17 10:59:14,058 INFO L85 PathProgramCache]: Analyzing trace with hash 354732748, now seen corresponding path program 11 times [2021-12-17 10:59:14,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-17 10:59:14,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300021295] [2021-12-17 10:59:14,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-17 10:59:14,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-17 11:08:27,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat