/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/list-ext2-properties/list_and_tree_cnstr-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:06:38,217 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 17:06:38,221 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 17:06:38,262 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 17:06:38,262 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 17:06:38,272 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 17:06:38,273 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 17:06:38,275 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 17:06:38,277 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 17:06:38,278 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 17:06:38,279 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 17:06:38,280 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 17:06:38,280 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:06:38,281 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:06:38,282 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:06:38,283 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:06:38,284 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:06:38,285 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:06:38,286 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:06:38,288 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:06:38,290 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:06:38,291 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:06:38,292 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:06:38,293 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:06:38,295 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 17:06:38,295 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 17:06:38,295 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 17:06:38,296 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 17:06:38,297 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 17:06:38,298 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 17:06:38,298 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 17:06:38,299 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 17:06:38,299 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 17:06:38,300 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 17:06:38,301 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 17:06:38,301 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 17:06:38,302 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 17:06:38,302 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 17:06:38,302 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:06:38,303 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:06:38,304 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:06:38,305 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 17:06:38,326 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:06:38,327 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:06:38,328 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:06:38,328 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:06:38,328 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:06:38,328 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:06:38,329 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:06:38,329 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:06:38,329 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:06:38,329 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:06:38,329 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:06:38,330 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:06:38,330 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:06:38,330 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:06:38,330 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:06:38,330 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:06:38,331 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:06:38,331 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:06:38,331 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:06:38,331 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:06:38,331 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:06:38,332 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:06:38,332 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:06:38,332 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:06:38,332 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:06:38,332 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:06:38,333 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:06:38,333 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:06:38,333 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:06:38,333 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 17:06:38,667 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:06:38,688 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:06:38,696 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:06:38,698 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:06:38,698 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:06:38,699 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext2-properties/list_and_tree_cnstr-1.i [2020-08-18 17:06:38,758 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6302c56b3/2998031355634317bb19ca8e7f87a022/FLAGe0083722d [2020-08-18 17:06:39,275 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:06:39,275 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/list-ext2-properties/list_and_tree_cnstr-1.i [2020-08-18 17:06:39,292 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6302c56b3/2998031355634317bb19ca8e7f87a022/FLAGe0083722d [2020-08-18 17:06:39,581 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6302c56b3/2998031355634317bb19ca8e7f87a022 [2020-08-18 17:06:39,590 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:06:39,592 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:06:39,593 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:06:39,593 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:06:39,597 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:06:39,598 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:06:39" (1/1) ... [2020-08-18 17:06:39,601 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22589b7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:39, skipping insertion in model container [2020-08-18 17:06:39,601 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:06:39" (1/1) ... [2020-08-18 17:06:39,609 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:06:39,649 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:06:40,094 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:06:40,111 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:06:40,207 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:06:40,260 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:06:40,261 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:40 WrapperNode [2020-08-18 17:06:40,261 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:06:40,262 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:06:40,262 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:06:40,262 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:06:40,273 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:40" (1/1) ... [2020-08-18 17:06:40,273 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:40" (1/1) ... [2020-08-18 17:06:40,293 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:40" (1/1) ... [2020-08-18 17:06:40,294 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:40" (1/1) ... [2020-08-18 17:06:40,317 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:40" (1/1) ... [2020-08-18 17:06:40,326 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:40" (1/1) ... [2020-08-18 17:06:40,330 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:40" (1/1) ... [2020-08-18 17:06:40,337 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:06:40,338 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:06:40,338 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:06:40,338 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:06:40,339 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:40" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:06:40,401 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:06:40,401 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:06:40,401 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-08-18 17:06:40,402 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-08-18 17:06:40,402 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-08-18 17:06:40,402 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:06:40,402 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:06:40,402 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 17:06:40,402 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-08-18 17:06:40,403 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-08-18 17:06:40,403 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-08-18 17:06:40,403 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-08-18 17:06:40,403 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-08-18 17:06:40,403 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-08-18 17:06:40,403 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-08-18 17:06:40,404 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-08-18 17:06:40,404 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-08-18 17:06:40,404 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-08-18 17:06:40,404 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-08-18 17:06:40,404 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-08-18 17:06:40,404 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-08-18 17:06:40,404 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-08-18 17:06:40,404 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-08-18 17:06:40,405 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-08-18 17:06:40,405 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-08-18 17:06:40,405 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-08-18 17:06:40,405 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-08-18 17:06:40,405 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-08-18 17:06:40,405 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-08-18 17:06:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-08-18 17:06:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-08-18 17:06:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-08-18 17:06:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-08-18 17:06:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-08-18 17:06:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-08-18 17:06:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-08-18 17:06:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-08-18 17:06:40,406 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-08-18 17:06:40,407 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-08-18 17:06:40,407 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-08-18 17:06:40,407 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-08-18 17:06:40,407 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-08-18 17:06:40,407 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-08-18 17:06:40,407 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-08-18 17:06:40,407 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-08-18 17:06:40,407 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-08-18 17:06:40,408 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-08-18 17:06:40,408 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-08-18 17:06:40,408 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-08-18 17:06:40,408 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-08-18 17:06:40,408 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-08-18 17:06:40,408 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-08-18 17:06:40,408 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-08-18 17:06:40,409 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-08-18 17:06:40,409 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-08-18 17:06:40,409 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-08-18 17:06:40,409 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-08-18 17:06:40,409 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-08-18 17:06:40,409 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-08-18 17:06:40,410 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-08-18 17:06:40,410 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 17:06:40,410 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-08-18 17:06:40,410 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-08-18 17:06:40,410 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-18 17:06:40,410 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-08-18 17:06:40,411 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-08-18 17:06:40,411 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-08-18 17:06:40,411 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-08-18 17:06:40,411 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-08-18 17:06:40,411 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 17:06:40,411 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-08-18 17:06:40,411 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-08-18 17:06:40,412 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-08-18 17:06:40,412 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-08-18 17:06:40,412 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-08-18 17:06:40,412 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-08-18 17:06:40,412 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-08-18 17:06:40,412 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-08-18 17:06:40,413 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-08-18 17:06:40,413 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-08-18 17:06:40,413 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-08-18 17:06:40,413 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-08-18 17:06:40,413 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-08-18 17:06:40,413 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-08-18 17:06:40,413 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-08-18 17:06:40,414 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-08-18 17:06:40,414 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-08-18 17:06:40,414 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-08-18 17:06:40,414 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-08-18 17:06:40,414 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-08-18 17:06:40,414 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-08-18 17:06:40,414 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-08-18 17:06:40,415 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-08-18 17:06:40,415 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-08-18 17:06:40,415 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-08-18 17:06:40,415 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-08-18 17:06:40,415 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-08-18 17:06:40,415 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-08-18 17:06:40,415 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-08-18 17:06:40,416 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-08-18 17:06:40,416 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-08-18 17:06:40,416 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-08-18 17:06:40,416 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-08-18 17:06:40,416 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-08-18 17:06:40,416 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-08-18 17:06:40,416 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-08-18 17:06:40,417 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-08-18 17:06:40,417 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-08-18 17:06:40,417 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-08-18 17:06:40,417 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-08-18 17:06:40,417 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-08-18 17:06:40,417 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-08-18 17:06:40,417 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-08-18 17:06:40,418 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-08-18 17:06:40,418 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:06:40,418 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 17:06:40,418 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 17:06:40,418 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 17:06:40,418 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 17:06:40,419 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 17:06:40,419 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 17:06:40,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:06:40,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:06:40,832 INFO L732 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-08-18 17:06:41,097 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:06:41,098 INFO L295 CfgBuilder]: Removed 8 assume(true) statements. [2020-08-18 17:06:41,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:06:41 BoogieIcfgContainer [2020-08-18 17:06:41,102 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:06:41,104 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:06:41,104 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:06:41,107 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:06:41,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:06:39" (1/3) ... [2020-08-18 17:06:41,108 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d31093d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:06:41, skipping insertion in model container [2020-08-18 17:06:41,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:06:40" (2/3) ... [2020-08-18 17:06:41,109 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d31093d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:06:41, skipping insertion in model container [2020-08-18 17:06:41,109 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:06:41" (3/3) ... [2020-08-18 17:06:41,111 INFO L109 eAbstractionObserver]: Analyzing ICFG list_and_tree_cnstr-1.i [2020-08-18 17:06:41,121 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:06:41,128 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:06:41,142 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:06:41,166 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:06:41,167 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:06:41,167 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:06:41,171 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:06:41,171 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:06:41,172 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:06:41,172 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:06:41,172 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:06:41,202 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states. [2020-08-18 17:06:41,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 17:06:41,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:41,211 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:41,212 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:41,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:41,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1575706012, now seen corresponding path program 1 times [2020-08-18 17:06:41,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:41,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [687539149] [2020-08-18 17:06:41,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:41,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:41,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:41,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:41,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:41,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [687539149] [2020-08-18 17:06:41,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:06:41,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 17:06:41,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191261997] [2020-08-18 17:06:41,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 17:06:41,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:41,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 17:06:41,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:06:41,475 INFO L87 Difference]: Start difference. First operand 57 states. Second operand 3 states. [2020-08-18 17:06:41,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:41,721 INFO L93 Difference]: Finished difference Result 108 states and 166 transitions. [2020-08-18 17:06:41,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 17:06:41,723 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-08-18 17:06:41,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:41,731 INFO L225 Difference]: With dead ends: 108 [2020-08-18 17:06:41,731 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 17:06:41,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:06:41,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 17:06:41,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 17:06:41,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 17:06:41,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 64 transitions. [2020-08-18 17:06:41,779 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 64 transitions. Word has length 20 [2020-08-18 17:06:41,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:41,779 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 64 transitions. [2020-08-18 17:06:41,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 17:06:41,780 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 64 transitions. [2020-08-18 17:06:41,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 17:06:41,781 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:41,781 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:41,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:06:41,782 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:41,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:41,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1627887593, now seen corresponding path program 1 times [2020-08-18 17:06:41,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:41,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426986874] [2020-08-18 17:06:41,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:41,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:41,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:41,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:41,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:41,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426986874] [2020-08-18 17:06:41,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:06:41,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:06:41,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727879331] [2020-08-18 17:06:41,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:06:41,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:41,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:06:41,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:06:41,866 INFO L87 Difference]: Start difference. First operand 47 states and 64 transitions. Second operand 4 states. [2020-08-18 17:06:42,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:42,025 INFO L93 Difference]: Finished difference Result 75 states and 101 transitions. [2020-08-18 17:06:42,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:06:42,026 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2020-08-18 17:06:42,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:42,028 INFO L225 Difference]: With dead ends: 75 [2020-08-18 17:06:42,029 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 17:06:42,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:06:42,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 17:06:42,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 17:06:42,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 17:06:42,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 77 transitions. [2020-08-18 17:06:42,040 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 77 transitions. Word has length 25 [2020-08-18 17:06:42,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:42,041 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 77 transitions. [2020-08-18 17:06:42,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:06:42,041 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 77 transitions. [2020-08-18 17:06:42,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 17:06:42,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:42,042 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:42,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:06:42,043 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:42,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:42,043 INFO L82 PathProgramCache]: Analyzing trace with hash -164754602, now seen corresponding path program 1 times [2020-08-18 17:06:42,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:42,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140109323] [2020-08-18 17:06:42,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:42,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:42,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:42,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:42,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:06:42,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140109323] [2020-08-18 17:06:42,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:06:42,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:06:42,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275510860] [2020-08-18 17:06:42,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:06:42,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:42,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:06:42,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:06:42,109 INFO L87 Difference]: Start difference. First operand 55 states and 77 transitions. Second operand 4 states. [2020-08-18 17:06:42,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:42,238 INFO L93 Difference]: Finished difference Result 93 states and 131 transitions. [2020-08-18 17:06:42,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:06:42,239 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 31 [2020-08-18 17:06:42,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:42,240 INFO L225 Difference]: With dead ends: 93 [2020-08-18 17:06:42,241 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 17:06:42,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:06:42,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 17:06:42,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 17:06:42,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 17:06:42,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 79 transitions. [2020-08-18 17:06:42,250 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 79 transitions. Word has length 31 [2020-08-18 17:06:42,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:42,250 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 79 transitions. [2020-08-18 17:06:42,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:06:42,250 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 79 transitions. [2020-08-18 17:06:42,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 17:06:42,251 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:42,252 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:42,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:06:42,252 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:42,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:42,253 INFO L82 PathProgramCache]: Analyzing trace with hash -982403052, now seen corresponding path program 1 times [2020-08-18 17:06:42,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:42,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1961449038] [2020-08-18 17:06:42,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:42,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:42,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:42,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:42,372 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:42,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1961449038] [2020-08-18 17:06:42,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:06:42,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 17:06:42,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273259938] [2020-08-18 17:06:42,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:06:42,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:42,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:06:42,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:06:42,375 INFO L87 Difference]: Start difference. First operand 57 states and 79 transitions. Second operand 6 states. [2020-08-18 17:06:42,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:42,632 INFO L93 Difference]: Finished difference Result 82 states and 108 transitions. [2020-08-18 17:06:42,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:06:42,632 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2020-08-18 17:06:42,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:42,634 INFO L225 Difference]: With dead ends: 82 [2020-08-18 17:06:42,634 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 17:06:42,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:06:42,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 17:06:42,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 66. [2020-08-18 17:06:42,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 17:06:42,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 91 transitions. [2020-08-18 17:06:42,644 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 91 transitions. Word has length 31 [2020-08-18 17:06:42,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:42,645 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 91 transitions. [2020-08-18 17:06:42,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:06:42,645 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 91 transitions. [2020-08-18 17:06:42,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 17:06:42,646 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:42,646 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:42,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:06:42,647 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:42,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:42,648 INFO L82 PathProgramCache]: Analyzing trace with hash 852152367, now seen corresponding path program 1 times [2020-08-18 17:06:42,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:42,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890424024] [2020-08-18 17:06:42,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:42,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:42,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:42,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:42,778 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:42,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890424024] [2020-08-18 17:06:42,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:06:42,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 17:06:42,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331540343] [2020-08-18 17:06:42,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:06:42,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:42,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:06:42,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:06:42,781 INFO L87 Difference]: Start difference. First operand 66 states and 91 transitions. Second operand 6 states. [2020-08-18 17:06:43,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:43,018 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2020-08-18 17:06:43,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:06:43,019 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-08-18 17:06:43,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:43,020 INFO L225 Difference]: With dead ends: 84 [2020-08-18 17:06:43,020 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 17:06:43,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:06:43,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 17:06:43,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 64. [2020-08-18 17:06:43,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 17:06:43,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 88 transitions. [2020-08-18 17:06:43,028 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 88 transitions. Word has length 33 [2020-08-18 17:06:43,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:43,029 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 88 transitions. [2020-08-18 17:06:43,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:06:43,029 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 88 transitions. [2020-08-18 17:06:43,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 17:06:43,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:43,031 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:43,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:06:43,031 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:43,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:43,032 INFO L82 PathProgramCache]: Analyzing trace with hash 1876855343, now seen corresponding path program 1 times [2020-08-18 17:06:43,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:43,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1888608660] [2020-08-18 17:06:43,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:43,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:43,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:43,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:43,095 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:43,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1888608660] [2020-08-18 17:06:43,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:06:43,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 17:06:43,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965674442] [2020-08-18 17:06:43,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:06:43,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:43,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:06:43,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:06:43,098 INFO L87 Difference]: Start difference. First operand 64 states and 88 transitions. Second operand 6 states. [2020-08-18 17:06:43,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:43,292 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2020-08-18 17:06:43,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:06:43,293 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-08-18 17:06:43,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:43,295 INFO L225 Difference]: With dead ends: 84 [2020-08-18 17:06:43,295 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 17:06:43,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:06:43,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 17:06:43,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 61. [2020-08-18 17:06:43,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 17:06:43,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 84 transitions. [2020-08-18 17:06:43,309 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 84 transitions. Word has length 33 [2020-08-18 17:06:43,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:43,309 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 84 transitions. [2020-08-18 17:06:43,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:06:43,309 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 84 transitions. [2020-08-18 17:06:43,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 17:06:43,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:43,314 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:43,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:06:43,314 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:43,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:43,315 INFO L82 PathProgramCache]: Analyzing trace with hash -778946181, now seen corresponding path program 1 times [2020-08-18 17:06:43,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:43,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303738295] [2020-08-18 17:06:43,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:43,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:43,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:43,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:43,498 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:43,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303738295] [2020-08-18 17:06:43,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:43,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 17:06:43,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827548908] [2020-08-18 17:06:43,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 17:06:43,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:43,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 17:06:43,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:06:43,501 INFO L87 Difference]: Start difference. First operand 61 states and 84 transitions. Second operand 9 states. [2020-08-18 17:06:43,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:43,839 INFO L93 Difference]: Finished difference Result 86 states and 112 transitions. [2020-08-18 17:06:43,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 17:06:43,839 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-08-18 17:06:43,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:43,841 INFO L225 Difference]: With dead ends: 86 [2020-08-18 17:06:43,841 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 17:06:43,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:06:43,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 17:06:43,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 68. [2020-08-18 17:06:43,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 17:06:43,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 92 transitions. [2020-08-18 17:06:43,857 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 92 transitions. Word has length 35 [2020-08-18 17:06:43,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:43,857 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 92 transitions. [2020-08-18 17:06:43,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 17:06:43,858 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 92 transitions. [2020-08-18 17:06:43,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 17:06:43,863 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:43,863 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:43,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:06:43,864 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:43,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:43,864 INFO L82 PathProgramCache]: Analyzing trace with hash 84455483, now seen corresponding path program 1 times [2020-08-18 17:06:43,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:43,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203929588] [2020-08-18 17:06:43,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:43,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:44,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:44,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:44,035 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:44,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203929588] [2020-08-18 17:06:44,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:44,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 17:06:44,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454281784] [2020-08-18 17:06:44,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 17:06:44,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:44,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 17:06:44,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:06:44,037 INFO L87 Difference]: Start difference. First operand 68 states and 92 transitions. Second operand 9 states. [2020-08-18 17:06:44,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:44,360 INFO L93 Difference]: Finished difference Result 95 states and 123 transitions. [2020-08-18 17:06:44,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 17:06:44,361 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-08-18 17:06:44,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:44,362 INFO L225 Difference]: With dead ends: 95 [2020-08-18 17:06:44,363 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 17:06:44,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:06:44,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 17:06:44,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 79. [2020-08-18 17:06:44,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 17:06:44,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 106 transitions. [2020-08-18 17:06:44,374 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 106 transitions. Word has length 35 [2020-08-18 17:06:44,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:44,374 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 106 transitions. [2020-08-18 17:06:44,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 17:06:44,375 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 106 transitions. [2020-08-18 17:06:44,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 17:06:44,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:44,376 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:44,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 17:06:44,377 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:44,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:44,377 INFO L82 PathProgramCache]: Analyzing trace with hash -169587242, now seen corresponding path program 1 times [2020-08-18 17:06:44,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:44,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198919952] [2020-08-18 17:06:44,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:44,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:44,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:44,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:44,562 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:44,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198919952] [2020-08-18 17:06:44,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:44,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:06:44,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994969549] [2020-08-18 17:06:44,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:06:44,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:44,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:06:44,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:06:44,565 INFO L87 Difference]: Start difference. First operand 79 states and 106 transitions. Second operand 10 states. [2020-08-18 17:06:44,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:44,992 INFO L93 Difference]: Finished difference Result 99 states and 128 transitions. [2020-08-18 17:06:44,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 17:06:44,993 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-08-18 17:06:44,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:44,994 INFO L225 Difference]: With dead ends: 99 [2020-08-18 17:06:44,994 INFO L226 Difference]: Without dead ends: 95 [2020-08-18 17:06:44,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:06:44,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-18 17:06:45,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 83. [2020-08-18 17:06:45,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 17:06:45,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 111 transitions. [2020-08-18 17:06:45,002 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 111 transitions. Word has length 37 [2020-08-18 17:06:45,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:45,002 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 111 transitions. [2020-08-18 17:06:45,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:06:45,003 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 111 transitions. [2020-08-18 17:06:45,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 17:06:45,004 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:45,004 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:45,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 17:06:45,004 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:45,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:45,005 INFO L82 PathProgramCache]: Analyzing trace with hash 284097905, now seen corresponding path program 1 times [2020-08-18 17:06:45,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:45,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326956810] [2020-08-18 17:06:45,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:45,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:45,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:45,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:45,183 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:45,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326956810] [2020-08-18 17:06:45,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:45,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:06:45,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351063085] [2020-08-18 17:06:45,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:06:45,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:45,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:06:45,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:06:45,186 INFO L87 Difference]: Start difference. First operand 83 states and 111 transitions. Second operand 10 states. [2020-08-18 17:06:45,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:45,605 INFO L93 Difference]: Finished difference Result 101 states and 130 transitions. [2020-08-18 17:06:45,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 17:06:45,606 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2020-08-18 17:06:45,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:45,608 INFO L225 Difference]: With dead ends: 101 [2020-08-18 17:06:45,608 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 17:06:45,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:06:45,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 17:06:45,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 74. [2020-08-18 17:06:45,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 17:06:45,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 99 transitions. [2020-08-18 17:06:45,614 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 99 transitions. Word has length 39 [2020-08-18 17:06:45,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:45,615 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 99 transitions. [2020-08-18 17:06:45,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:06:45,615 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 99 transitions. [2020-08-18 17:06:45,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 17:06:45,616 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:45,617 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:45,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 17:06:45,617 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:45,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:45,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1308800881, now seen corresponding path program 2 times [2020-08-18 17:06:45,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:45,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2045758277] [2020-08-18 17:06:45,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:45,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:45,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:45,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:45,848 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:45,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2045758277] [2020-08-18 17:06:45,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:45,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:06:45,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58668767] [2020-08-18 17:06:45,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:06:45,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:45,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:06:45,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:06:45,850 INFO L87 Difference]: Start difference. First operand 74 states and 99 transitions. Second operand 10 states. [2020-08-18 17:06:46,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:46,251 INFO L93 Difference]: Finished difference Result 94 states and 121 transitions. [2020-08-18 17:06:46,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 17:06:46,252 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2020-08-18 17:06:46,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:46,253 INFO L225 Difference]: With dead ends: 94 [2020-08-18 17:06:46,254 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 17:06:46,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:06:46,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 17:06:46,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 69. [2020-08-18 17:06:46,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 17:06:46,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 93 transitions. [2020-08-18 17:06:46,259 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 93 transitions. Word has length 39 [2020-08-18 17:06:46,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:46,259 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 93 transitions. [2020-08-18 17:06:46,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:06:46,260 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 93 transitions. [2020-08-18 17:06:46,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 17:06:46,261 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:46,261 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:46,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 17:06:46,261 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:46,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:46,262 INFO L82 PathProgramCache]: Analyzing trace with hash -315248798, now seen corresponding path program 2 times [2020-08-18 17:06:46,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:46,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697627236] [2020-08-18 17:06:46,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:46,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:46,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:46,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:46,439 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:46,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697627236] [2020-08-18 17:06:46,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:46,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:06:46,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118195154] [2020-08-18 17:06:46,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:06:46,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:46,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:06:46,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:06:46,442 INFO L87 Difference]: Start difference. First operand 69 states and 93 transitions. Second operand 13 states. [2020-08-18 17:06:47,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:47,021 INFO L93 Difference]: Finished difference Result 94 states and 121 transitions. [2020-08-18 17:06:47,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 17:06:47,022 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-08-18 17:06:47,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:47,023 INFO L225 Difference]: With dead ends: 94 [2020-08-18 17:06:47,023 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 17:06:47,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:06:47,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 17:06:47,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 80. [2020-08-18 17:06:47,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 17:06:47,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 106 transitions. [2020-08-18 17:06:47,030 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 106 transitions. Word has length 39 [2020-08-18 17:06:47,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:47,030 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 106 transitions. [2020-08-18 17:06:47,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:06:47,031 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 106 transitions. [2020-08-18 17:06:47,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 17:06:47,032 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:47,032 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:47,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 17:06:47,032 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:47,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:47,033 INFO L82 PathProgramCache]: Analyzing trace with hash -15546846, now seen corresponding path program 1 times [2020-08-18 17:06:47,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:47,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21304230] [2020-08-18 17:06:47,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:47,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:47,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:47,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:47,204 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:47,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21304230] [2020-08-18 17:06:47,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:47,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:06:47,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620960634] [2020-08-18 17:06:47,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:06:47,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:47,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:06:47,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:06:47,206 INFO L87 Difference]: Start difference. First operand 80 states and 106 transitions. Second operand 13 states. [2020-08-18 17:06:47,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:47,877 INFO L93 Difference]: Finished difference Result 107 states and 137 transitions. [2020-08-18 17:06:47,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 17:06:47,878 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-08-18 17:06:47,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:47,879 INFO L225 Difference]: With dead ends: 107 [2020-08-18 17:06:47,879 INFO L226 Difference]: Without dead ends: 103 [2020-08-18 17:06:47,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2020-08-18 17:06:47,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-18 17:06:47,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 82. [2020-08-18 17:06:47,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 17:06:47,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 109 transitions. [2020-08-18 17:06:47,885 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 109 transitions. Word has length 39 [2020-08-18 17:06:47,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:47,886 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 109 transitions. [2020-08-18 17:06:47,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:06:47,886 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 109 transitions. [2020-08-18 17:06:47,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 17:06:47,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:47,887 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:47,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 17:06:47,887 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:47,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:47,888 INFO L82 PathProgramCache]: Analyzing trace with hash 2037263357, now seen corresponding path program 1 times [2020-08-18 17:06:47,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:47,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43714958] [2020-08-18 17:06:47,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:47,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:48,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:48,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:48,115 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:48,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [43714958] [2020-08-18 17:06:48,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:48,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:06:48,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015577907] [2020-08-18 17:06:48,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:06:48,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:48,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:06:48,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:06:48,118 INFO L87 Difference]: Start difference. First operand 82 states and 109 transitions. Second operand 13 states. [2020-08-18 17:06:48,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:48,654 INFO L93 Difference]: Finished difference Result 109 states and 139 transitions. [2020-08-18 17:06:48,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 17:06:48,655 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2020-08-18 17:06:48,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:48,656 INFO L225 Difference]: With dead ends: 109 [2020-08-18 17:06:48,656 INFO L226 Difference]: Without dead ends: 101 [2020-08-18 17:06:48,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:06:48,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-08-18 17:06:48,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 91. [2020-08-18 17:06:48,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 17:06:48,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 119 transitions. [2020-08-18 17:06:48,665 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 119 transitions. Word has length 41 [2020-08-18 17:06:48,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:48,666 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 119 transitions. [2020-08-18 17:06:48,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:06:48,666 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 119 transitions. [2020-08-18 17:06:48,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 17:06:48,669 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:48,669 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:48,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 17:06:48,670 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:48,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:48,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1233000963, now seen corresponding path program 3 times [2020-08-18 17:06:48,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:48,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334137382] [2020-08-18 17:06:48,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:48,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:49,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:06:49,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:06:49,089 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:06:49,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334137382] [2020-08-18 17:06:49,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:06:49,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:06:49,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202913307] [2020-08-18 17:06:49,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:06:49,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:06:49,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:06:49,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:06:49,091 INFO L87 Difference]: Start difference. First operand 91 states and 119 transitions. Second operand 13 states. [2020-08-18 17:06:49,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:06:49,867 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2020-08-18 17:06:49,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 17:06:49,867 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2020-08-18 17:06:49,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:06:49,869 INFO L225 Difference]: With dead ends: 116 [2020-08-18 17:06:49,869 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 17:06:49,870 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:06:49,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 17:06:49,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2020-08-18 17:06:49,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-08-18 17:06:49,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 128 transitions. [2020-08-18 17:06:49,877 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 128 transitions. Word has length 41 [2020-08-18 17:06:49,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:06:49,878 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 128 transitions. [2020-08-18 17:06:49,878 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:06:49,878 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 128 transitions. [2020-08-18 17:06:49,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 17:06:49,879 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:06:49,879 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:06:49,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 17:06:49,879 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:06:49,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:06:49,880 INFO L82 PathProgramCache]: Analyzing trace with hash -2006936899, now seen corresponding path program 1 times [2020-08-18 17:06:49,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:06:49,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [540696836] [2020-08-18 17:06:49,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:06:49,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 17:06:49,900 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 17:06:49,900 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 17:06:49,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 17:06:49,926 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 05:06:49 BoogieIcfgContainer [2020-08-18 17:06:49,926 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 17:06:49,929 INFO L168 Benchmark]: Toolchain (without parser) took 10336.92 ms. Allocated memory was 147.3 MB in the beginning and 306.7 MB in the end (delta: 159.4 MB). Free memory was 102.2 MB in the beginning and 114.5 MB in the end (delta: -12.3 MB). Peak memory consumption was 147.1 MB. Max. memory is 7.1 GB. [2020-08-18 17:06:49,930 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 147.3 MB. Free memory was 121.8 MB in the beginning and 121.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-18 17:06:49,931 INFO L168 Benchmark]: CACSL2BoogieTranslator took 668.44 ms. Allocated memory was 147.3 MB in the beginning and 203.4 MB in the end (delta: 56.1 MB). Free memory was 102.0 MB in the beginning and 169.3 MB in the end (delta: -67.3 MB). Peak memory consumption was 22.7 MB. Max. memory is 7.1 GB. [2020-08-18 17:06:49,932 INFO L168 Benchmark]: Boogie Preprocessor took 76.12 ms. Allocated memory is still 203.4 MB. Free memory was 169.3 MB in the beginning and 166.0 MB in the end (delta: 3.3 MB). Peak memory consumption was 3.3 MB. Max. memory is 7.1 GB. [2020-08-18 17:06:49,932 INFO L168 Benchmark]: RCFGBuilder took 764.44 ms. Allocated memory is still 203.4 MB. Free memory was 166.0 MB in the beginning and 109.3 MB in the end (delta: 56.7 MB). Peak memory consumption was 56.7 MB. Max. memory is 7.1 GB. [2020-08-18 17:06:49,933 INFO L168 Benchmark]: TraceAbstraction took 8822.94 ms. Allocated memory was 203.4 MB in the beginning and 306.7 MB in the end (delta: 103.3 MB). Free memory was 108.7 MB in the beginning and 114.5 MB in the end (delta: -5.8 MB). Peak memory consumption was 97.4 MB. Max. memory is 7.1 GB. [2020-08-18 17:06:49,936 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 147.3 MB. Free memory was 121.8 MB in the beginning and 121.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 668.44 ms. Allocated memory was 147.3 MB in the beginning and 203.4 MB in the end (delta: 56.1 MB). Free memory was 102.0 MB in the beginning and 169.3 MB in the end (delta: -67.3 MB). Peak memory consumption was 22.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 76.12 ms. Allocated memory is still 203.4 MB. Free memory was 169.3 MB in the beginning and 166.0 MB in the end (delta: 3.3 MB). Peak memory consumption was 3.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 764.44 ms. Allocated memory is still 203.4 MB. Free memory was 166.0 MB in the beginning and 109.3 MB in the end (delta: 56.7 MB). Peak memory consumption was 56.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8822.94 ms. Allocated memory was 203.4 MB in the beginning and 306.7 MB in the end (delta: 103.3 MB). Free memory was 108.7 MB in the beginning and 114.5 MB in the end (delta: -5.8 MB). Peak memory consumption was 97.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 609]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L541] struct TreeNode* root = malloc(sizeof(*root)), *n; [L542] root->left = ((void *)0) [L543] root->right = ((void *)0) [L544] COND FALSE !(__VERIFIER_nondet_int()) [L563] n = ((void *)0) [L564] struct TreeNode* pred; [L565] COND TRUE \read(*root) [L566] pred = ((void *)0) [L567] n = root [L568] EXPR n->left [L568] n->left || n->right [L568] EXPR n->right [L568] n->left || n->right [L568] COND FALSE !(n->left || n->right) [L575] COND FALSE !(\read(*pred)) [L581] root = ((void *)0) [L565] COND FALSE !(\read(*root)) [L584] List a = (List) malloc(sizeof(struct node)); [L585] COND FALSE !(a == 0) [L586] List t; [L587] List p = a; [L588] COND TRUE __VERIFIER_nondet_int() [L589] p->h = 1 [L590] t = (List) malloc(sizeof(struct node)) [L591] COND FALSE !(t == 0) [L592] p->n = t [L593] EXPR p->n [L593] p = p->n [L588] COND FALSE !(__VERIFIER_nondet_int()) [L595] COND TRUE __VERIFIER_nondet_int() [L596] p->h = 2 [L597] t = (List) malloc(sizeof(struct node)) [L598] COND FALSE !(t == 0) [L599] p->n = t [L600] EXPR p->n [L600] p = p->n [L595] COND FALSE !(__VERIFIER_nondet_int()) [L602] p->h = 3 [L603] p = a [L604] EXPR p->h [L604] COND FALSE !(p->h == 2) [L606] EXPR p->h [L606] COND TRUE p->h == 1 [L607] EXPR p->n [L607] p = p->n [L606] EXPR p->h [L606] COND FALSE !(p->h == 1) [L608] EXPR p->h [L608] COND TRUE p->h != 3 [L609] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 64 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 8.7s, OverallIterations: 16, TraceHistogramMax: 3, AutomataDifference: 5.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 855 SDtfs, 581 SDslu, 3411 SDs, 0 SdLazy, 3002 SolverSat, 254 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 222 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 2.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=98occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 15 MinimizatonAttempts, 154 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 559 NumberOfCodeBlocks, 559 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 503 ConstructedInterpolants, 0 QuantifiedInterpolants, 106880 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 15 InterpolantComputations, 6 PerfectInterpolantSequences, 25/71 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...