/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=SHALLOWEST -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 20:19:51,410 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:19:51,413 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:19:51,465 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:19:51,466 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:19:51,467 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:19:51,468 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:19:51,470 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:19:51,471 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:19:51,472 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:19:51,473 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:19:51,474 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:19:51,475 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:19:51,476 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:19:51,477 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:19:51,478 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:19:51,479 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:19:51,480 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:19:51,482 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:19:51,483 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:19:51,485 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:19:51,486 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:19:51,487 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:19:51,488 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:19:51,491 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 20:19:51,491 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 20:19:51,491 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 20:19:51,492 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 20:19:51,493 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 20:19:51,494 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 20:19:51,494 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 20:19:51,494 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 20:19:51,495 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 20:19:51,496 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 20:19:51,497 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 20:19:51,497 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 20:19:51,498 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 20:19:51,498 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 20:19:51,498 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:19:51,499 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:19:51,500 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:19:51,501 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 20:19:51,523 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:19:51,524 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:19:51,525 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:19:51,525 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:19:51,525 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:19:51,526 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:19:51,526 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:19:51,526 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:19:51,526 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:19:51,526 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:19:51,527 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:19:51,527 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:19:51,527 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:19:51,527 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:19:51,527 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:19:51,528 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:19:51,528 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:19:51,528 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:19:51,528 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:19:51,529 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:19:51,529 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:19:51,529 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:19:51,529 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:19:51,529 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:19:51,530 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:19:51,530 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:19:51,530 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:19:51,530 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:19:51,530 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:19:51,531 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=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:19:51,836 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:19:51,849 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:19:51,852 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:19:51,854 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:19:51,854 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:19:51,855 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext2-properties/list_and_tree_cnstr-1.i [2020-08-18 20:19:51,927 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ae540d347/ceddd4e4b79e473ab6f7b9658bf73538/FLAGb001f396e [2020-08-18 20:19:52,447 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:19:52,448 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/list-ext2-properties/list_and_tree_cnstr-1.i [2020-08-18 20:19:52,462 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ae540d347/ceddd4e4b79e473ab6f7b9658bf73538/FLAGb001f396e [2020-08-18 20:19:52,780 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ae540d347/ceddd4e4b79e473ab6f7b9658bf73538 [2020-08-18 20:19:52,789 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:19:52,791 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:19:52,792 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:19:52,793 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:19:52,799 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:19:52,800 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:19:52" (1/1) ... [2020-08-18 20:19:52,803 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43d6dd5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:52, skipping insertion in model container [2020-08-18 20:19:52,803 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:19:52" (1/1) ... [2020-08-18 20:19:52,813 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:19:52,854 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:19:53,319 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:19:53,335 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:19:53,427 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:19:53,484 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:19:53,486 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:53 WrapperNode [2020-08-18 20:19:53,486 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:19:53,487 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:19:53,487 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:19:53,487 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:19:53,497 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:53" (1/1) ... [2020-08-18 20:19:53,498 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:53" (1/1) ... [2020-08-18 20:19:53,517 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:53" (1/1) ... [2020-08-18 20:19:53,517 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:53" (1/1) ... [2020-08-18 20:19:53,541 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:53" (1/1) ... [2020-08-18 20:19:53,549 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:53" (1/1) ... [2020-08-18 20:19:53,553 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:53" (1/1) ... [2020-08-18 20:19:53,560 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:19:53,563 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:19:53,563 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:19:53,564 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:19:53,566 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:53" (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 20:19:53,629 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:19:53,629 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:19:53,629 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-08-18 20:19:53,629 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-08-18 20:19:53,630 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-08-18 20:19:53,630 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:19:53,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:19:53,631 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 20:19:53,631 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-08-18 20:19:53,631 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-08-18 20:19:53,632 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-08-18 20:19:53,632 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-08-18 20:19:53,633 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-08-18 20:19:53,633 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-08-18 20:19:53,633 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-08-18 20:19:53,634 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-08-18 20:19:53,634 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-08-18 20:19:53,634 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-08-18 20:19:53,634 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-08-18 20:19:53,634 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-08-18 20:19:53,634 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-08-18 20:19:53,635 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-08-18 20:19:53,635 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-08-18 20:19:53,635 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-08-18 20:19:53,635 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-08-18 20:19:53,636 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-08-18 20:19:53,636 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-08-18 20:19:53,636 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-08-18 20:19:53,637 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-08-18 20:19:53,637 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-08-18 20:19:53,637 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-08-18 20:19:53,637 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-08-18 20:19:53,637 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-08-18 20:19:53,637 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-08-18 20:19:53,638 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-08-18 20:19:53,638 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-08-18 20:19:53,638 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-08-18 20:19:53,638 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-08-18 20:19:53,638 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-08-18 20:19:53,638 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-08-18 20:19:53,638 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-08-18 20:19:53,639 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-08-18 20:19:53,639 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-08-18 20:19:53,639 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-08-18 20:19:53,639 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-08-18 20:19:53,639 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-08-18 20:19:53,639 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-08-18 20:19:53,639 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-08-18 20:19:53,640 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-08-18 20:19:53,640 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-08-18 20:19:53,640 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-08-18 20:19:53,640 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-08-18 20:19:53,640 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-08-18 20:19:53,640 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-08-18 20:19:53,641 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-08-18 20:19:53,641 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-08-18 20:19:53,641 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-08-18 20:19:53,641 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-08-18 20:19:53,642 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-08-18 20:19:53,642 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-08-18 20:19:53,642 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 20:19:53,642 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-08-18 20:19:53,642 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-08-18 20:19:53,642 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-18 20:19:53,642 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-08-18 20:19:53,643 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-08-18 20:19:53,643 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-08-18 20:19:53,644 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-08-18 20:19:53,644 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-08-18 20:19:53,644 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 20:19:53,644 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-08-18 20:19:53,644 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-08-18 20:19:53,645 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-08-18 20:19:53,645 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-08-18 20:19:53,646 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-08-18 20:19:53,646 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-08-18 20:19:53,648 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-08-18 20:19:53,648 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-08-18 20:19:53,648 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-08-18 20:19:53,648 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-08-18 20:19:53,648 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-08-18 20:19:53,648 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-08-18 20:19:53,649 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-08-18 20:19:53,649 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-08-18 20:19:53,650 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-08-18 20:19:53,650 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-08-18 20:19:53,650 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-08-18 20:19:53,650 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-08-18 20:19:53,650 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-08-18 20:19:53,650 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-08-18 20:19:53,650 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-08-18 20:19:53,651 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-08-18 20:19:53,651 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-08-18 20:19:53,651 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-08-18 20:19:53,651 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-08-18 20:19:53,651 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-08-18 20:19:53,651 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-08-18 20:19:53,651 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-08-18 20:19:53,652 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-08-18 20:19:53,652 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-08-18 20:19:53,652 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-08-18 20:19:53,652 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-08-18 20:19:53,652 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-08-18 20:19:53,652 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-08-18 20:19:53,652 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-08-18 20:19:53,653 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-08-18 20:19:53,653 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-08-18 20:19:53,653 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-08-18 20:19:53,653 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-08-18 20:19:53,653 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-08-18 20:19:53,653 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-08-18 20:19:53,653 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-08-18 20:19:53,654 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-08-18 20:19:53,654 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-08-18 20:19:53,654 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:19:53,654 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 20:19:53,654 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 20:19:53,655 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 20:19:53,655 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 20:19:53,656 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 20:19:53,656 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 20:19:53,656 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:19:53,657 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:19:54,046 INFO L732 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-08-18 20:19:54,397 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:19:54,397 INFO L295 CfgBuilder]: Removed 8 assume(true) statements. [2020-08-18 20:19:54,407 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:19:54 BoogieIcfgContainer [2020-08-18 20:19:54,408 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:19:54,410 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:19:54,410 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:19:54,415 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:19:54,415 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:19:52" (1/3) ... [2020-08-18 20:19:54,416 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b23eca3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:19:54, skipping insertion in model container [2020-08-18 20:19:54,416 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:53" (2/3) ... [2020-08-18 20:19:54,417 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b23eca3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:19:54, skipping insertion in model container [2020-08-18 20:19:54,417 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:19:54" (3/3) ... [2020-08-18 20:19:54,419 INFO L109 eAbstractionObserver]: Analyzing ICFG list_and_tree_cnstr-1.i [2020-08-18 20:19:54,432 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:19:54,440 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:19:54,456 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:19:54,477 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:19:54,477 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:19:54,477 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:19:54,477 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:19:54,478 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:19:54,478 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:19:54,478 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:19:54,478 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:19:54,496 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states. [2020-08-18 20:19:54,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 20:19:54,503 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:54,503 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 20:19:54,504 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:54,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:54,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1575706012, now seen corresponding path program 1 times [2020-08-18 20:19:54,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:54,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639762499] [2020-08-18 20:19:54,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:54,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:54,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:54,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:54,757 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 20:19:54,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639762499] [2020-08-18 20:19:54,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:19:54,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 20:19:54,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742779347] [2020-08-18 20:19:54,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 20:19:54,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:54,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 20:19:54,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:19:54,784 INFO L87 Difference]: Start difference. First operand 57 states. Second operand 3 states. [2020-08-18 20:19:55,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:55,011 INFO L93 Difference]: Finished difference Result 108 states and 166 transitions. [2020-08-18 20:19:55,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:19:55,013 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-08-18 20:19:55,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:55,023 INFO L225 Difference]: With dead ends: 108 [2020-08-18 20:19:55,023 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 20:19:55,027 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 20:19:55,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 20:19:55,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 20:19:55,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 20:19:55,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 64 transitions. [2020-08-18 20:19:55,071 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 64 transitions. Word has length 20 [2020-08-18 20:19:55,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:55,071 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 64 transitions. [2020-08-18 20:19:55,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 20:19:55,071 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 64 transitions. [2020-08-18 20:19:55,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 20:19:55,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:55,073 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 20:19:55,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:19:55,074 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:55,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:55,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1627887593, now seen corresponding path program 1 times [2020-08-18 20:19:55,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:55,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428674957] [2020-08-18 20:19:55,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:55,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:55,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:55,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:55,152 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 20:19:55,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428674957] [2020-08-18 20:19:55,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:19:55,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 20:19:55,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867775862] [2020-08-18 20:19:55,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:19:55,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:55,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:19:55,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:19:55,156 INFO L87 Difference]: Start difference. First operand 47 states and 64 transitions. Second operand 4 states. [2020-08-18 20:19:55,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:55,298 INFO L93 Difference]: Finished difference Result 75 states and 101 transitions. [2020-08-18 20:19:55,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:19:55,299 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2020-08-18 20:19:55,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:55,302 INFO L225 Difference]: With dead ends: 75 [2020-08-18 20:19:55,302 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 20:19:55,303 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 20:19:55,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 20:19:55,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 20:19:55,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 20:19:55,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 77 transitions. [2020-08-18 20:19:55,313 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 77 transitions. Word has length 25 [2020-08-18 20:19:55,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:55,314 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 77 transitions. [2020-08-18 20:19:55,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:19:55,314 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 77 transitions. [2020-08-18 20:19:55,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 20:19:55,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:55,316 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 20:19:55,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:19:55,316 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:55,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:55,317 INFO L82 PathProgramCache]: Analyzing trace with hash -164754602, now seen corresponding path program 1 times [2020-08-18 20:19:55,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:55,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1985060717] [2020-08-18 20:19:55,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:55,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:55,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:55,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:55,397 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 20:19:55,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1985060717] [2020-08-18 20:19:55,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:19:55,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 20:19:55,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766287763] [2020-08-18 20:19:55,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:19:55,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:55,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:19:55,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:19:55,403 INFO L87 Difference]: Start difference. First operand 55 states and 77 transitions. Second operand 4 states. [2020-08-18 20:19:55,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:55,558 INFO L93 Difference]: Finished difference Result 93 states and 131 transitions. [2020-08-18 20:19:55,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:19:55,560 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 31 [2020-08-18 20:19:55,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:55,561 INFO L225 Difference]: With dead ends: 93 [2020-08-18 20:19:55,562 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 20:19:55,564 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 20:19:55,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 20:19:55,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 20:19:55,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 20:19:55,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 79 transitions. [2020-08-18 20:19:55,581 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 79 transitions. Word has length 31 [2020-08-18 20:19:55,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:55,582 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 79 transitions. [2020-08-18 20:19:55,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:19:55,582 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 79 transitions. [2020-08-18 20:19:55,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 20:19:55,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:55,584 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 20:19:55,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:19:55,585 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:55,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:55,585 INFO L82 PathProgramCache]: Analyzing trace with hash -982403052, now seen corresponding path program 1 times [2020-08-18 20:19:55,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:55,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38434488] [2020-08-18 20:19:55,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:55,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:55,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:55,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:55,706 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 20:19:55,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38434488] [2020-08-18 20:19:55,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:19:55,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 20:19:55,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668649593] [2020-08-18 20:19:55,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:19:55,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:55,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:19:55,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:19:55,709 INFO L87 Difference]: Start difference. First operand 57 states and 79 transitions. Second operand 6 states. [2020-08-18 20:19:55,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:55,916 INFO L93 Difference]: Finished difference Result 82 states and 108 transitions. [2020-08-18 20:19:55,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:19:55,917 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2020-08-18 20:19:55,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:55,918 INFO L225 Difference]: With dead ends: 82 [2020-08-18 20:19:55,919 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 20:19:55,919 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 20:19:55,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 20:19:55,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 66. [2020-08-18 20:19:55,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 20:19:55,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 91 transitions. [2020-08-18 20:19:55,929 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 91 transitions. Word has length 31 [2020-08-18 20:19:55,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:55,930 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 91 transitions. [2020-08-18 20:19:55,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:19:55,930 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 91 transitions. [2020-08-18 20:19:55,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 20:19:55,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:55,932 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 20:19:55,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:19:55,932 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:55,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:55,933 INFO L82 PathProgramCache]: Analyzing trace with hash 852152367, now seen corresponding path program 1 times [2020-08-18 20:19:55,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:55,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649719410] [2020-08-18 20:19:55,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:55,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:56,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:56,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:56,025 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 20:19:56,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649719410] [2020-08-18 20:19:56,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:19:56,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 20:19:56,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778565794] [2020-08-18 20:19:56,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:19:56,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:56,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:19:56,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:19:56,029 INFO L87 Difference]: Start difference. First operand 66 states and 91 transitions. Second operand 6 states. [2020-08-18 20:19:56,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:56,257 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2020-08-18 20:19:56,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:19:56,257 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-08-18 20:19:56,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:56,258 INFO L225 Difference]: With dead ends: 84 [2020-08-18 20:19:56,259 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 20:19:56,259 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 20:19:56,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 20:19:56,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 64. [2020-08-18 20:19:56,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 20:19:56,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 88 transitions. [2020-08-18 20:19:56,282 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 88 transitions. Word has length 33 [2020-08-18 20:19:56,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:56,282 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 88 transitions. [2020-08-18 20:19:56,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:19:56,283 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 88 transitions. [2020-08-18 20:19:56,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 20:19:56,286 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:56,286 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 20:19:56,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:19:56,287 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:56,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:56,287 INFO L82 PathProgramCache]: Analyzing trace with hash 1876855343, now seen corresponding path program 1 times [2020-08-18 20:19:56,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:56,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143661615] [2020-08-18 20:19:56,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:56,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:56,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:56,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:56,400 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 20:19:56,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143661615] [2020-08-18 20:19:56,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:19:56,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 20:19:56,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356167595] [2020-08-18 20:19:56,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:19:56,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:56,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:19:56,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:19:56,403 INFO L87 Difference]: Start difference. First operand 64 states and 88 transitions. Second operand 6 states. [2020-08-18 20:19:56,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:56,610 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2020-08-18 20:19:56,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:19:56,610 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-08-18 20:19:56,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:56,611 INFO L225 Difference]: With dead ends: 84 [2020-08-18 20:19:56,611 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 20:19:56,612 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 20:19:56,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 20:19:56,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 61. [2020-08-18 20:19:56,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 20:19:56,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 84 transitions. [2020-08-18 20:19:56,625 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 84 transitions. Word has length 33 [2020-08-18 20:19:56,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:56,625 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 84 transitions. [2020-08-18 20:19:56,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:19:56,626 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 84 transitions. [2020-08-18 20:19:56,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 20:19:56,629 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:56,630 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 20:19:56,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:19:56,630 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:56,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:56,634 INFO L82 PathProgramCache]: Analyzing trace with hash -778946181, now seen corresponding path program 1 times [2020-08-18 20:19:56,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:56,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1864451063] [2020-08-18 20:19:56,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:56,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:56,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:56,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:56,840 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 20:19:56,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1864451063] [2020-08-18 20:19:56,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:56,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:19:56,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568952305] [2020-08-18 20:19:56,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:19:56,842 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:56,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:19:56,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:19:56,844 INFO L87 Difference]: Start difference. First operand 61 states and 84 transitions. Second operand 9 states. [2020-08-18 20:19:57,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:57,183 INFO L93 Difference]: Finished difference Result 86 states and 112 transitions. [2020-08-18 20:19:57,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 20:19:57,183 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-08-18 20:19:57,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:57,184 INFO L225 Difference]: With dead ends: 86 [2020-08-18 20:19:57,184 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 20:19:57,185 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 20:19:57,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 20:19:57,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 68. [2020-08-18 20:19:57,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 20:19:57,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 92 transitions. [2020-08-18 20:19:57,194 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 92 transitions. Word has length 35 [2020-08-18 20:19:57,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:57,194 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 92 transitions. [2020-08-18 20:19:57,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:19:57,194 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 92 transitions. [2020-08-18 20:19:57,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 20:19:57,195 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:57,196 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 20:19:57,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 20:19:57,196 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:57,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:57,196 INFO L82 PathProgramCache]: Analyzing trace with hash 84455483, now seen corresponding path program 1 times [2020-08-18 20:19:57,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:57,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1339676195] [2020-08-18 20:19:57,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:57,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:57,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:57,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:57,316 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 20:19:57,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1339676195] [2020-08-18 20:19:57,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:57,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:19:57,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019390710] [2020-08-18 20:19:57,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:19:57,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:57,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:19:57,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:19:57,318 INFO L87 Difference]: Start difference. First operand 68 states and 92 transitions. Second operand 9 states. [2020-08-18 20:19:57,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:57,667 INFO L93 Difference]: Finished difference Result 95 states and 123 transitions. [2020-08-18 20:19:57,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 20:19:57,668 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-08-18 20:19:57,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:57,669 INFO L225 Difference]: With dead ends: 95 [2020-08-18 20:19:57,669 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 20:19:57,673 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 20:19:57,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 20:19:57,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 79. [2020-08-18 20:19:57,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 20:19:57,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 106 transitions. [2020-08-18 20:19:57,686 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 106 transitions. Word has length 35 [2020-08-18 20:19:57,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:57,687 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 106 transitions. [2020-08-18 20:19:57,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:19:57,687 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 106 transitions. [2020-08-18 20:19:57,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 20:19:57,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:57,692 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 20:19:57,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 20:19:57,692 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:57,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:57,692 INFO L82 PathProgramCache]: Analyzing trace with hash -169587242, now seen corresponding path program 1 times [2020-08-18 20:19:57,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:57,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153851253] [2020-08-18 20:19:57,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:57,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:57,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:57,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:57,984 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 20:19:57,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153851253] [2020-08-18 20:19:57,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:57,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:19:57,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487576038] [2020-08-18 20:19:57,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:19:57,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:57,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:19:57,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:19:57,987 INFO L87 Difference]: Start difference. First operand 79 states and 106 transitions. Second operand 10 states. [2020-08-18 20:19:58,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:58,386 INFO L93 Difference]: Finished difference Result 99 states and 128 transitions. [2020-08-18 20:19:58,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:19:58,387 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-08-18 20:19:58,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:58,388 INFO L225 Difference]: With dead ends: 99 [2020-08-18 20:19:58,388 INFO L226 Difference]: Without dead ends: 95 [2020-08-18 20:19:58,389 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 20:19:58,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-18 20:19:58,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 83. [2020-08-18 20:19:58,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 20:19:58,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 111 transitions. [2020-08-18 20:19:58,396 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 111 transitions. Word has length 37 [2020-08-18 20:19:58,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:58,396 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 111 transitions. [2020-08-18 20:19:58,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:19:58,397 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 111 transitions. [2020-08-18 20:19:58,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 20:19:58,398 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:58,398 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 20:19:58,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 20:19:58,399 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:58,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:58,399 INFO L82 PathProgramCache]: Analyzing trace with hash 284097905, now seen corresponding path program 1 times [2020-08-18 20:19:58,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:58,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891275293] [2020-08-18 20:19:58,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:58,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:58,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:58,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:58,580 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 20:19:58,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891275293] [2020-08-18 20:19:58,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:58,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:19:58,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033501219] [2020-08-18 20:19:58,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:19:58,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:58,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:19:58,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:19:58,582 INFO L87 Difference]: Start difference. First operand 83 states and 111 transitions. Second operand 10 states. [2020-08-18 20:19:58,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:58,975 INFO L93 Difference]: Finished difference Result 101 states and 130 transitions. [2020-08-18 20:19:58,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:19:58,975 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2020-08-18 20:19:58,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:58,977 INFO L225 Difference]: With dead ends: 101 [2020-08-18 20:19:58,977 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 20:19:58,977 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 20:19:58,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 20:19:58,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 74. [2020-08-18 20:19:58,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 20:19:58,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 99 transitions. [2020-08-18 20:19:58,984 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 99 transitions. Word has length 39 [2020-08-18 20:19:58,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:58,984 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 99 transitions. [2020-08-18 20:19:58,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:19:58,984 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 99 transitions. [2020-08-18 20:19:58,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 20:19:58,985 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:58,986 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 20:19:58,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 20:19:58,986 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:58,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:58,986 INFO L82 PathProgramCache]: Analyzing trace with hash 1308800881, now seen corresponding path program 2 times [2020-08-18 20:19:58,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:58,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648844313] [2020-08-18 20:19:58,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:59,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:59,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:59,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:59,170 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 20:19:59,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648844313] [2020-08-18 20:19:59,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:59,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:19:59,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214499100] [2020-08-18 20:19:59,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:19:59,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:59,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:19:59,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:19:59,173 INFO L87 Difference]: Start difference. First operand 74 states and 99 transitions. Second operand 10 states. [2020-08-18 20:19:59,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:59,614 INFO L93 Difference]: Finished difference Result 94 states and 121 transitions. [2020-08-18 20:19:59,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:19:59,614 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2020-08-18 20:19:59,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:59,615 INFO L225 Difference]: With dead ends: 94 [2020-08-18 20:19:59,616 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 20:19:59,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:19:59,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 20:19:59,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 69. [2020-08-18 20:19:59,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 20:19:59,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 93 transitions. [2020-08-18 20:19:59,622 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 93 transitions. Word has length 39 [2020-08-18 20:19:59,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:59,622 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 93 transitions. [2020-08-18 20:19:59,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:19:59,623 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 93 transitions. [2020-08-18 20:19:59,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 20:19:59,624 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:59,624 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 20:19:59,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 20:19:59,624 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:59,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:59,625 INFO L82 PathProgramCache]: Analyzing trace with hash -315248798, now seen corresponding path program 2 times [2020-08-18 20:19:59,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:59,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697036963] [2020-08-18 20:19:59,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:59,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:59,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:59,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:59,804 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 20:19:59,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697036963] [2020-08-18 20:19:59,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:59,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:19:59,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685612039] [2020-08-18 20:19:59,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:19:59,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:59,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:19:59,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:19:59,806 INFO L87 Difference]: Start difference. First operand 69 states and 93 transitions. Second operand 13 states. [2020-08-18 20:20:00,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:20:00,346 INFO L93 Difference]: Finished difference Result 94 states and 121 transitions. [2020-08-18 20:20:00,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 20:20:00,346 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-08-18 20:20:00,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:20:00,347 INFO L225 Difference]: With dead ends: 94 [2020-08-18 20:20:00,347 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 20:20:00,348 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 20:20:00,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 20:20:00,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 80. [2020-08-18 20:20:00,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 20:20:00,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 106 transitions. [2020-08-18 20:20:00,353 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 106 transitions. Word has length 39 [2020-08-18 20:20:00,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:20:00,354 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 106 transitions. [2020-08-18 20:20:00,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:20:00,354 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 106 transitions. [2020-08-18 20:20:00,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 20:20:00,355 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:20:00,355 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 20:20:00,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 20:20:00,355 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:20:00,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:20:00,356 INFO L82 PathProgramCache]: Analyzing trace with hash -15546846, now seen corresponding path program 1 times [2020-08-18 20:20:00,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:20:00,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92959393] [2020-08-18 20:20:00,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:20:00,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:00,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:20:00,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:00,515 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 20:20:00,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92959393] [2020-08-18 20:20:00,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:20:00,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:20:00,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183399790] [2020-08-18 20:20:00,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:20:00,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:20:00,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:20:00,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:20:00,518 INFO L87 Difference]: Start difference. First operand 80 states and 106 transitions. Second operand 13 states. [2020-08-18 20:20:01,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:20:01,156 INFO L93 Difference]: Finished difference Result 107 states and 137 transitions. [2020-08-18 20:20:01,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 20:20:01,156 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-08-18 20:20:01,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:20:01,157 INFO L225 Difference]: With dead ends: 107 [2020-08-18 20:20:01,158 INFO L226 Difference]: Without dead ends: 103 [2020-08-18 20:20:01,158 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 20:20:01,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-18 20:20:01,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 82. [2020-08-18 20:20:01,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 20:20:01,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 109 transitions. [2020-08-18 20:20:01,163 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 109 transitions. Word has length 39 [2020-08-18 20:20:01,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:20:01,163 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 109 transitions. [2020-08-18 20:20:01,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:20:01,163 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 109 transitions. [2020-08-18 20:20:01,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 20:20:01,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:20:01,164 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 20:20:01,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 20:20:01,164 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:20:01,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:20:01,164 INFO L82 PathProgramCache]: Analyzing trace with hash 2037263357, now seen corresponding path program 1 times [2020-08-18 20:20:01,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:20:01,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [379294564] [2020-08-18 20:20:01,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:20:01,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:01,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:20:01,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:01,322 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 20:20:01,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [379294564] [2020-08-18 20:20:01,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:20:01,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:20:01,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465311691] [2020-08-18 20:20:01,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:20:01,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:20:01,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:20:01,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:20:01,324 INFO L87 Difference]: Start difference. First operand 82 states and 109 transitions. Second operand 13 states. [2020-08-18 20:20:01,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:20:01,876 INFO L93 Difference]: Finished difference Result 109 states and 139 transitions. [2020-08-18 20:20:01,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 20:20:01,876 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2020-08-18 20:20:01,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:20:01,877 INFO L225 Difference]: With dead ends: 109 [2020-08-18 20:20:01,878 INFO L226 Difference]: Without dead ends: 101 [2020-08-18 20:20:01,878 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 20:20:01,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-08-18 20:20:01,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 91. [2020-08-18 20:20:01,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 20:20:01,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 119 transitions. [2020-08-18 20:20:01,884 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 119 transitions. Word has length 41 [2020-08-18 20:20:01,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:20:01,884 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 119 transitions. [2020-08-18 20:20:01,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:20:01,884 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 119 transitions. [2020-08-18 20:20:01,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 20:20:01,885 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:20:01,885 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 20:20:01,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 20:20:01,886 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:20:01,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:20:01,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1233000963, now seen corresponding path program 3 times [2020-08-18 20:20:01,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:20:01,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1790931142] [2020-08-18 20:20:01,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:20:01,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:02,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:20:02,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:02,203 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 20:20:02,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1790931142] [2020-08-18 20:20:02,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:20:02,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:20:02,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091450974] [2020-08-18 20:20:02,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:20:02,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:20:02,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:20:02,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:20:02,205 INFO L87 Difference]: Start difference. First operand 91 states and 119 transitions. Second operand 13 states. [2020-08-18 20:20:02,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:20:02,963 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2020-08-18 20:20:02,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 20:20:02,964 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2020-08-18 20:20:02,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:20:02,965 INFO L225 Difference]: With dead ends: 116 [2020-08-18 20:20:02,965 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 20:20:02,966 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 20:20:02,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 20:20:02,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2020-08-18 20:20:02,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-08-18 20:20:02,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 128 transitions. [2020-08-18 20:20:02,972 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 128 transitions. Word has length 41 [2020-08-18 20:20:02,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:20:02,972 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 128 transitions. [2020-08-18 20:20:02,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:20:02,973 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 128 transitions. [2020-08-18 20:20:02,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 20:20:02,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:20:02,973 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 20:20:02,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 20:20:02,974 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:20:02,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:20:02,974 INFO L82 PathProgramCache]: Analyzing trace with hash -2006936899, now seen corresponding path program 1 times [2020-08-18 20:20:02,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:20:02,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1060426945] [2020-08-18 20:20:02,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:20:03,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 20:20:03,009 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 20:20:03,011 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 20:20:03,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 20:20:03,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 08:20:03 BoogieIcfgContainer [2020-08-18 20:20:03,054 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 20:20:03,059 INFO L168 Benchmark]: Toolchain (without parser) took 10267.23 ms. Allocated memory was 147.3 MB in the beginning and 311.4 MB in the end (delta: 164.1 MB). Free memory was 101.0 MB in the beginning and 137.5 MB in the end (delta: -36.5 MB). Peak memory consumption was 127.6 MB. Max. memory is 7.1 GB. [2020-08-18 20:20:03,060 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 147.3 MB. Free memory was 120.6 MB in the beginning and 120.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 20:20:03,064 INFO L168 Benchmark]: CACSL2BoogieTranslator took 693.85 ms. Allocated memory was 147.3 MB in the beginning and 203.9 MB in the end (delta: 56.6 MB). Free memory was 100.8 MB in the beginning and 168.0 MB in the end (delta: -67.2 MB). Peak memory consumption was 20.1 MB. Max. memory is 7.1 GB. [2020-08-18 20:20:03,064 INFO L168 Benchmark]: Boogie Preprocessor took 76.27 ms. Allocated memory is still 203.9 MB. Free memory was 168.0 MB in the beginning and 164.8 MB in the end (delta: 3.3 MB). Peak memory consumption was 3.3 MB. Max. memory is 7.1 GB. [2020-08-18 20:20:03,066 INFO L168 Benchmark]: RCFGBuilder took 844.50 ms. Allocated memory is still 203.9 MB. Free memory was 164.8 MB in the beginning and 107.7 MB in the end (delta: 57.0 MB). Peak memory consumption was 57.0 MB. Max. memory is 7.1 GB. [2020-08-18 20:20:03,067 INFO L168 Benchmark]: TraceAbstraction took 8644.07 ms. Allocated memory was 203.9 MB in the beginning and 311.4 MB in the end (delta: 107.5 MB). Free memory was 107.1 MB in the beginning and 137.5 MB in the end (delta: -30.4 MB). Peak memory consumption was 77.1 MB. Max. memory is 7.1 GB. [2020-08-18 20:20:03,076 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 147.3 MB. Free memory was 120.6 MB in the beginning and 120.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 693.85 ms. Allocated memory was 147.3 MB in the beginning and 203.9 MB in the end (delta: 56.6 MB). Free memory was 100.8 MB in the beginning and 168.0 MB in the end (delta: -67.2 MB). Peak memory consumption was 20.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 76.27 ms. Allocated memory is still 203.9 MB. Free memory was 168.0 MB in the beginning and 164.8 MB in the end (delta: 3.3 MB). Peak memory consumption was 3.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 844.50 ms. Allocated memory is still 203.9 MB. Free memory was 164.8 MB in the beginning and 107.7 MB in the end (delta: 57.0 MB). Peak memory consumption was 57.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8644.07 ms. Allocated memory was 203.9 MB in the beginning and 311.4 MB in the end (delta: 107.5 MB). Free memory was 107.1 MB in the beginning and 137.5 MB in the end (delta: -30.4 MB). Peak memory consumption was 77.1 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: 8.5s, OverallIterations: 16, TraceHistogramMax: 3, AutomataDifference: 5.6s, 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, 2.5s 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, 1.9s 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...