/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.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 --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf language data_model -i ../../../trunk/examples/svcomp/heap-manipulation/merge_sort-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-27 19:53:16,937 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-27 19:53:16,940 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-27 19:53:17,001 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-27 19:53:17,002 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-27 19:53:17,009 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-27 19:53:17,012 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-27 19:53:17,016 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-27 19:53:17,020 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-27 19:53:17,026 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-27 19:53:17,028 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-27 19:53:17,029 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-27 19:53:17,030 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-27 19:53:17,033 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-27 19:53:17,037 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-27 19:53:17,040 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-27 19:53:17,041 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-27 19:53:17,046 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-27 19:53:17,055 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-27 19:53:17,068 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-27 19:53:17,073 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-27 19:53:17,075 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-27 19:53:17,076 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-27 19:53:17,079 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-27 19:53:17,088 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-27 19:53:17,089 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-27 19:53:17,089 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-27 19:53:17,090 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-27 19:53:17,090 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-27 19:53:17,094 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-27 19:53:17,094 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-27 19:53:17,095 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-27 19:53:17,097 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-27 19:53:17,098 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-27 19:53:17,099 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-27 19:53:17,099 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-27 19:53:17,100 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-27 19:53:17,100 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-27 19:53:17,100 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-27 19:53:17,101 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-27 19:53:17,102 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-27 19:53:17,110 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 [2020-10-27 19:53:17,161 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-27 19:53:17,161 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-27 19:53:17,165 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-27 19:53:17,165 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-27 19:53:17,165 INFO L138 SettingsManager]: * Use SBE=true [2020-10-27 19:53:17,166 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-27 19:53:17,166 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-27 19:53:17,166 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-27 19:53:17,166 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-27 19:53:17,166 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-27 19:53:17,168 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-27 19:53:17,168 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-27 19:53:17,168 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-27 19:53:17,168 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-27 19:53:17,168 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-27 19:53:17,169 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-27 19:53:17,169 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-27 19:53:17,169 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-27 19:53:17,169 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-27 19:53:17,169 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-27 19:53:17,169 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-27 19:53:17,170 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 19:53:17,170 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-27 19:53:17,170 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-27 19:53:17,170 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-27 19:53:17,170 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-27 19:53:17,171 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-27 19:53:17,171 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-27 19:53:17,171 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-27 19:53:17,171 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true;unknown-allowed=true; [2020-10-27 19:53:17,582 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-27 19:53:17,618 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-27 19:53:17,622 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-27 19:53:17,623 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-27 19:53:17,624 INFO L275 PluginConnector]: CDTParser initialized [2020-10-27 19:53:17,625 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/heap-manipulation/merge_sort-1.i [2020-10-27 19:53:17,723 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9ded86dc0/0bf20e03439547779689968c56bfd3c7/FLAGc7e686a78 [2020-10-27 19:53:18,373 INFO L306 CDTParser]: Found 1 translation units. [2020-10-27 19:53:18,373 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/heap-manipulation/merge_sort-1.i [2020-10-27 19:53:18,408 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9ded86dc0/0bf20e03439547779689968c56bfd3c7/FLAGc7e686a78 [2020-10-27 19:53:18,672 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9ded86dc0/0bf20e03439547779689968c56bfd3c7 [2020-10-27 19:53:18,678 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-27 19:53:18,687 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-27 19:53:18,692 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-27 19:53:18,692 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-27 19:53:18,698 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-27 19:53:18,699 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:53:18" (1/1) ... [2020-10-27 19:53:18,706 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f206cc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:18, skipping insertion in model container [2020-10-27 19:53:18,706 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:53:18" (1/1) ... [2020-10-27 19:53:18,716 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-27 19:53:18,792 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-27 19:53:19,177 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:53:19,196 INFO L203 MainTranslator]: Completed pre-run [2020-10-27 19:53:19,269 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:53:19,334 INFO L208 MainTranslator]: Completed translation [2020-10-27 19:53:19,334 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:19 WrapperNode [2020-10-27 19:53:19,335 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-27 19:53:19,336 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-27 19:53:19,336 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-27 19:53:19,336 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-27 19:53:19,350 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:19" (1/1) ... [2020-10-27 19:53:19,350 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:19" (1/1) ... [2020-10-27 19:53:19,372 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:19" (1/1) ... [2020-10-27 19:53:19,372 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:19" (1/1) ... [2020-10-27 19:53:19,401 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:19" (1/1) ... [2020-10-27 19:53:19,414 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:19" (1/1) ... [2020-10-27 19:53:19,419 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:19" (1/1) ... [2020-10-27 19:53:19,429 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-27 19:53:19,430 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-27 19:53:19,431 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-27 19:53:19,431 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-27 19:53:19,432 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:19" (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 [2020-10-27 19:53:19,534 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-27 19:53:19,534 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-27 19:53:19,534 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-27 19:53:19,535 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-10-27 19:53:19,535 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-10-27 19:53:19,535 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2020-10-27 19:53:19,535 INFO L138 BoogieDeclarations]: Found implementation of procedure merge_single_node [2020-10-27 19:53:19,535 INFO L138 BoogieDeclarations]: Found implementation of procedure merge_pair [2020-10-27 19:53:19,535 INFO L138 BoogieDeclarations]: Found implementation of procedure seq_sort_core [2020-10-27 19:53:19,536 INFO L138 BoogieDeclarations]: Found implementation of procedure inspect_before [2020-10-27 19:53:19,536 INFO L138 BoogieDeclarations]: Found implementation of procedure inspect_after [2020-10-27 19:53:19,536 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-27 19:53:19,536 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-27 19:53:19,536 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-27 19:53:19,536 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2020-10-27 19:53:19,537 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2020-10-27 19:53:19,537 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-27 19:53:19,537 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-27 19:53:19,537 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-10-27 19:53:19,537 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-10-27 19:53:19,537 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-10-27 19:53:19,538 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-10-27 19:53:19,538 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-10-27 19:53:19,538 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-10-27 19:53:19,538 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-10-27 19:53:19,538 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-10-27 19:53:19,538 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-10-27 19:53:19,539 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-10-27 19:53:19,539 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-10-27 19:53:19,539 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-10-27 19:53:19,539 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-10-27 19:53:19,539 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-10-27 19:53:19,539 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-10-27 19:53:19,540 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-10-27 19:53:19,540 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-10-27 19:53:19,540 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-10-27 19:53:19,540 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-10-27 19:53:19,540 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-10-27 19:53:19,540 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-10-27 19:53:19,540 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-10-27 19:53:19,541 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-10-27 19:53:19,541 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-10-27 19:53:19,541 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-10-27 19:53:19,541 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-10-27 19:53:19,541 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-10-27 19:53:19,541 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-10-27 19:53:19,541 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-10-27 19:53:19,542 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-10-27 19:53:19,542 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-10-27 19:53:19,542 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-10-27 19:53:19,542 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-10-27 19:53:19,542 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-10-27 19:53:19,542 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-10-27 19:53:19,543 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-10-27 19:53:19,543 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-10-27 19:53:19,543 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-10-27 19:53:19,543 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-10-27 19:53:19,543 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-10-27 19:53:19,543 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-10-27 19:53:19,544 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-10-27 19:53:19,544 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-10-27 19:53:19,544 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-10-27 19:53:19,544 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-10-27 19:53:19,544 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-10-27 19:53:19,544 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-10-27 19:53:19,545 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-10-27 19:53:19,545 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-10-27 19:53:19,545 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-10-27 19:53:19,545 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-10-27 19:53:19,545 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-10-27 19:53:19,545 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-10-27 19:53:19,545 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-10-27 19:53:19,546 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-10-27 19:53:19,546 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-10-27 19:53:19,546 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-10-27 19:53:19,546 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-10-27 19:53:19,546 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-10-27 19:53:19,546 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-10-27 19:53:19,547 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-10-27 19:53:19,547 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-10-27 19:53:19,547 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-27 19:53:19,547 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-10-27 19:53:19,547 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-10-27 19:53:19,547 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-10-27 19:53:19,548 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-10-27 19:53:19,548 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-10-27 19:53:19,548 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-10-27 19:53:19,548 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-10-27 19:53:19,548 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-10-27 19:53:19,548 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-10-27 19:53:19,548 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-10-27 19:53:19,549 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-10-27 19:53:19,549 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-10-27 19:53:19,549 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-10-27 19:53:19,549 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-10-27 19:53:19,549 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-10-27 19:53:19,549 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-10-27 19:53:19,550 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-10-27 19:53:19,550 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-10-27 19:53:19,550 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-10-27 19:53:19,550 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-10-27 19:53:19,550 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-10-27 19:53:19,550 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-10-27 19:53:19,550 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-10-27 19:53:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-10-27 19:53:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-10-27 19:53:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-10-27 19:53:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-10-27 19:53:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-10-27 19:53:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-10-27 19:53:19,552 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-10-27 19:53:19,552 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-10-27 19:53:19,552 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-10-27 19:53:19,552 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-10-27 19:53:19,552 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-10-27 19:53:19,552 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-10-27 19:53:19,552 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-10-27 19:53:19,553 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-10-27 19:53:19,553 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-10-27 19:53:19,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-27 19:53:19,553 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2020-10-27 19:53:19,553 INFO L130 BoogieDeclarations]: Found specification of procedure merge_single_node [2020-10-27 19:53:19,553 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-10-27 19:53:19,553 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-10-27 19:53:19,554 INFO L130 BoogieDeclarations]: Found specification of procedure merge_pair [2020-10-27 19:53:19,554 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-27 19:53:19,554 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-27 19:53:19,554 INFO L130 BoogieDeclarations]: Found specification of procedure seq_sort_core [2020-10-27 19:53:19,554 INFO L130 BoogieDeclarations]: Found specification of procedure inspect_before [2020-10-27 19:53:19,554 INFO L130 BoogieDeclarations]: Found specification of procedure inspect_after [2020-10-27 19:53:19,555 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-27 19:53:19,555 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-10-27 19:53:19,555 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-27 19:53:19,555 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-27 19:53:19,555 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-27 19:53:19,555 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-27 19:53:20,602 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-27 19:53:20,602 INFO L298 CfgBuilder]: Removed 33 assume(true) statements. [2020-10-27 19:53:20,605 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:53:20 BoogieIcfgContainer [2020-10-27 19:53:20,606 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-27 19:53:20,609 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-27 19:53:20,609 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-27 19:53:20,613 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-27 19:53:20,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 07:53:18" (1/3) ... [2020-10-27 19:53:20,620 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@674504a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:53:20, skipping insertion in model container [2020-10-27 19:53:20,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:53:19" (2/3) ... [2020-10-27 19:53:20,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@674504a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:53:20, skipping insertion in model container [2020-10-27 19:53:20,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:53:20" (3/3) ... [2020-10-27 19:53:20,623 INFO L111 eAbstractionObserver]: Analyzing ICFG merge_sort-1.i [2020-10-27 19:53:20,637 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-27 19:53:20,643 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-27 19:53:20,660 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-27 19:53:20,702 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-27 19:53:20,702 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-27 19:53:20,702 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-27 19:53:20,702 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-27 19:53:20,702 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-27 19:53:20,702 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-27 19:53:20,703 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-27 19:53:20,703 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-27 19:53:20,732 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states. [2020-10-27 19:53:20,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-27 19:53:20,738 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:53:20,738 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 19:53:20,739 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:53:20,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:53:20,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1813451891, now seen corresponding path program 1 times [2020-10-27 19:53:20,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:53:20,755 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443214286] [2020-10-27 19:53:20,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:53:20,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:21,000 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:21,077 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:21,146 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:21,508 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:21,508 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-27 19:53:21,508 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:53:21,509 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 559 [2020-10-27 19:53:21,511 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:21,512 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:53:21,512 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-27 19:53:21,512 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-27 19:53:21,512 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-27 19:53:21,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:53:21,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:21,677 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:21,687 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:21,687 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:53:21,688 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:53:21,688 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 11 [2020-10-27 19:53:21,688 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:21,688 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:53:21,688 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:53:21,689 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:53:21,689 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:21,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:53:21,708 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443214286] [2020-10-27 19:53:21,711 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:53:21,711 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-27 19:53:21,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967373232] [2020-10-27 19:53:21,717 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 19:53:21,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:53:21,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 19:53:21,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:53:21,740 INFO L87 Difference]: Start difference. First operand 120 states. Second operand 6 states. [2020-10-27 19:53:22,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:53:22,517 INFO L93 Difference]: Finished difference Result 266 states and 458 transitions. [2020-10-27 19:53:22,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-27 19:53:22,519 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-10-27 19:53:22,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:53:22,533 INFO L225 Difference]: With dead ends: 266 [2020-10-27 19:53:22,533 INFO L226 Difference]: Without dead ends: 133 [2020-10-27 19:53:22,539 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-27 19:53:22,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-10-27 19:53:22,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 108. [2020-10-27 19:53:22,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-10-27 19:53:22,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 131 transitions. [2020-10-27 19:53:22,597 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 131 transitions. Word has length 15 [2020-10-27 19:53:22,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:53:22,598 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 131 transitions. [2020-10-27 19:53:22,598 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 19:53:22,598 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 131 transitions. [2020-10-27 19:53:22,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-27 19:53:22,599 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:53:22,599 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] [2020-10-27 19:53:22,600 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-27 19:53:22,600 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:53:22,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:53:22,601 INFO L82 PathProgramCache]: Analyzing trace with hash 633313099, now seen corresponding path program 1 times [2020-10-27 19:53:22,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:53:22,601 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2084632774] [2020-10-27 19:53:22,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:53:22,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:22,620 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:22,631 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:22,648 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:22,668 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:23,202 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:23,202 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 35 [2020-10-27 19:53:23,202 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-27 19:53:23,203 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 586 [2020-10-27 19:53:23,203 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:23,203 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:53:23,203 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 21 [2020-10-27 19:53:23,203 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-27 19:53:23,203 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:23,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:53:23,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:23,303 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:23,306 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:23,306 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:53:23,306 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:53:23,307 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-27 19:53:23,307 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:23,307 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:53:23,307 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:53:23,307 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:53:23,307 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:23,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:53:23,313 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2084632774] [2020-10-27 19:53:23,326 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:53:23,326 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-27 19:53:23,326 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071725403] [2020-10-27 19:53:23,332 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 19:53:23,332 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:53:23,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 19:53:23,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:53:23,339 INFO L87 Difference]: Start difference. First operand 108 states and 131 transitions. Second operand 6 states. [2020-10-27 19:53:23,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:53:23,937 INFO L93 Difference]: Finished difference Result 127 states and 157 transitions. [2020-10-27 19:53:23,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-27 19:53:23,938 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2020-10-27 19:53:23,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:53:23,940 INFO L225 Difference]: With dead ends: 127 [2020-10-27 19:53:23,941 INFO L226 Difference]: Without dead ends: 122 [2020-10-27 19:53:23,942 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-27 19:53:23,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-10-27 19:53:23,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 107. [2020-10-27 19:53:23,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-10-27 19:53:23,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 129 transitions. [2020-10-27 19:53:23,958 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 129 transitions. Word has length 23 [2020-10-27 19:53:23,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:53:23,959 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 129 transitions. [2020-10-27 19:53:23,959 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 19:53:23,959 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 129 transitions. [2020-10-27 19:53:23,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-27 19:53:23,960 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:53:23,960 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] [2020-10-27 19:53:23,960 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-27 19:53:23,960 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:53:23,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:53:23,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1441159317, now seen corresponding path program 1 times [2020-10-27 19:53:23,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:53:23,961 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [49358529] [2020-10-27 19:53:23,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:53:23,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:23,977 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:23,984 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:23,996 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:24,006 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:24,447 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:24,448 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 35 [2020-10-27 19:53:24,448 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-27 19:53:24,448 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 473 [2020-10-27 19:53:24,448 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:24,449 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:53:24,449 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 21 [2020-10-27 19:53:24,449 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-27 19:53:24,449 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:24,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:53:24,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:24,541 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:24,545 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:24,545 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:53:24,545 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:53:24,545 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-27 19:53:24,546 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:24,546 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:53:24,546 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:53:24,546 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:53:24,546 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:24,551 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:53:24,552 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [49358529] [2020-10-27 19:53:24,552 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:53:24,552 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-27 19:53:24,552 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668490481] [2020-10-27 19:53:24,553 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 19:53:24,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:53:24,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 19:53:24,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:53:24,554 INFO L87 Difference]: Start difference. First operand 107 states and 129 transitions. Second operand 6 states. [2020-10-27 19:53:25,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:53:25,250 INFO L93 Difference]: Finished difference Result 126 states and 155 transitions. [2020-10-27 19:53:25,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-27 19:53:25,251 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2020-10-27 19:53:25,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:53:25,253 INFO L225 Difference]: With dead ends: 126 [2020-10-27 19:53:25,253 INFO L226 Difference]: Without dead ends: 121 [2020-10-27 19:53:25,254 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-27 19:53:25,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-10-27 19:53:25,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 106. [2020-10-27 19:53:25,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-10-27 19:53:25,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 127 transitions. [2020-10-27 19:53:25,286 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 127 transitions. Word has length 23 [2020-10-27 19:53:25,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:53:25,286 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 127 transitions. [2020-10-27 19:53:25,286 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 19:53:25,286 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 127 transitions. [2020-10-27 19:53:25,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-10-27 19:53:25,288 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:53:25,288 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] [2020-10-27 19:53:25,289 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-27 19:53:25,289 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:53:25,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:53:25,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1296008184, now seen corresponding path program 1 times [2020-10-27 19:53:25,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:53:25,291 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1099337194] [2020-10-27 19:53:25,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:53:25,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:25,315 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:25,328 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:25,340 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:25,440 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:25,440 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 38 [2020-10-27 19:53:25,440 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:53:25,441 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 129 [2020-10-27 19:53:25,441 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:25,441 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:53:25,441 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-27 19:53:25,441 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-27 19:53:25,441 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:25,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:53:25,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:25,489 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:25,493 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:25,494 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:53:25,494 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:53:25,494 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-10-27 19:53:25,494 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:25,494 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:53:25,494 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:53:25,495 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:53:25,495 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:25,501 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:53:25,501 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1099337194] [2020-10-27 19:53:25,502 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:53:25,502 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-27 19:53:25,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616837621] [2020-10-27 19:53:25,505 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-27 19:53:25,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:53:25,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-27 19:53:25,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-27 19:53:25,506 INFO L87 Difference]: Start difference. First operand 106 states and 127 transitions. Second operand 4 states. [2020-10-27 19:53:25,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:53:25,851 INFO L93 Difference]: Finished difference Result 212 states and 257 transitions. [2020-10-27 19:53:25,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:53:25,853 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 26 [2020-10-27 19:53:25,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:53:25,854 INFO L225 Difference]: With dead ends: 212 [2020-10-27 19:53:25,855 INFO L226 Difference]: Without dead ends: 118 [2020-10-27 19:53:25,856 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:53:25,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-10-27 19:53:25,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 108. [2020-10-27 19:53:25,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-10-27 19:53:25,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 129 transitions. [2020-10-27 19:53:25,870 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 129 transitions. Word has length 26 [2020-10-27 19:53:25,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:53:25,871 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 129 transitions. [2020-10-27 19:53:25,871 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-27 19:53:25,871 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 129 transitions. [2020-10-27 19:53:25,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-27 19:53:25,872 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:53:25,872 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] [2020-10-27 19:53:25,872 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-27 19:53:25,873 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:53:25,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:53:25,873 INFO L82 PathProgramCache]: Analyzing trace with hash -178219071, now seen corresponding path program 1 times [2020-10-27 19:53:25,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:53:25,874 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105315189] [2020-10-27 19:53:25,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:53:25,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:25,901 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:25,985 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:26,062 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:26,062 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-10-27 19:53:26,062 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 19:53:26,062 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 168 [2020-10-27 19:53:26,063 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:26,063 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 19:53:26,063 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-10-27 19:53:26,063 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 22 [2020-10-27 19:53:26,063 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:26,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:53:26,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:26,207 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:26,211 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:26,211 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:53:26,211 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:53:26,212 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-27 19:53:26,212 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:26,212 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:53:26,212 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:53:26,213 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:53:26,213 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:26,224 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:53:26,225 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105315189] [2020-10-27 19:53:26,225 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:53:26,225 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-27 19:53:26,225 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443787819] [2020-10-27 19:53:26,226 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-27 19:53:26,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:53:26,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-27 19:53:26,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-27 19:53:26,227 INFO L87 Difference]: Start difference. First operand 108 states and 129 transitions. Second operand 8 states. [2020-10-27 19:53:27,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:53:27,162 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-10-27 19:53:27,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-27 19:53:27,163 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2020-10-27 19:53:27,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:53:27,165 INFO L225 Difference]: With dead ends: 151 [2020-10-27 19:53:27,165 INFO L226 Difference]: Without dead ends: 146 [2020-10-27 19:53:27,165 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-10-27 19:53:27,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-10-27 19:53:27,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 114. [2020-10-27 19:53:27,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-10-27 19:53:27,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 135 transitions. [2020-10-27 19:53:27,197 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 135 transitions. Word has length 32 [2020-10-27 19:53:27,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:53:27,198 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 135 transitions. [2020-10-27 19:53:27,198 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-27 19:53:27,199 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 135 transitions. [2020-10-27 19:53:27,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-27 19:53:27,200 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:53:27,200 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] [2020-10-27 19:53:27,202 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-27 19:53:27,202 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:53:27,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:53:27,203 INFO L82 PathProgramCache]: Analyzing trace with hash -509933216, now seen corresponding path program 1 times [2020-10-27 19:53:27,203 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:53:27,203 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1669304299] [2020-10-27 19:53:27,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:53:27,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:27,245 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:27,303 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:27,338 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:27,523 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:28,642 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:28,642 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-10-27 19:53:28,642 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-27 19:53:28,643 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1414 [2020-10-27 19:53:28,643 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:28,643 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 19:53:28,643 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-10-27 19:53:28,643 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 22 [2020-10-27 19:53:28,643 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:28,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:53:28,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:53:28,756 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:53:28,765 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:53:28,766 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:53:28,766 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:53:28,766 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-10-27 19:53:28,766 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:53:28,766 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:53:28,766 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:53:28,766 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:53:28,767 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:53:28,784 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:53:28,785 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1669304299] [2020-10-27 19:53:28,785 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:53:28,785 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-27 19:53:28,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767602111] [2020-10-27 19:53:28,786 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-27 19:53:28,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:53:28,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-27 19:53:28,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-27 19:53:28,792 INFO L87 Difference]: Start difference. First operand 114 states and 135 transitions. Second operand 8 states. [2020-10-27 19:53:29,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:53:29,709 INFO L93 Difference]: Finished difference Result 150 states and 179 transitions. [2020-10-27 19:53:29,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-27 19:53:29,711 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2020-10-27 19:53:29,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:53:29,713 INFO L225 Difference]: With dead ends: 150 [2020-10-27 19:53:29,713 INFO L226 Difference]: Without dead ends: 145 [2020-10-27 19:53:29,716 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-10-27 19:53:29,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-10-27 19:53:29,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 120. [2020-10-27 19:53:29,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-10-27 19:53:29,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 141 transitions. [2020-10-27 19:53:29,743 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 141 transitions. Word has length 32 [2020-10-27 19:53:29,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:53:29,743 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 141 transitions. [2020-10-27 19:53:29,743 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-27 19:53:29,743 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 141 transitions. [2020-10-27 19:53:29,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-10-27 19:53:29,746 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:53:29,747 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] [2020-10-27 19:53:29,748 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-27 19:53:29,748 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:53:29,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:53:29,748 INFO L82 PathProgramCache]: Analyzing trace with hash -2052818065, now seen corresponding path program 1 times [2020-10-27 19:53:29,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:53:29,749 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739705416] [2020-10-27 19:53:29,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:53:29,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-27 19:53:29,792 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-27 19:53:29,792 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-27 19:53:29,797 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-27 19:53:29,819 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 07:53:29 BoogieIcfgContainer [2020-10-27 19:53:29,819 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-27 19:53:29,824 INFO L168 Benchmark]: Toolchain (without parser) took 11140.40 ms. Allocated memory was 153.1 MB in the beginning and 270.5 MB in the end (delta: 117.4 MB). Free memory was 126.5 MB in the beginning and 245.3 MB in the end (delta: -118.8 MB). Peak memory consumption was 153.7 MB. Max. memory is 8.0 GB. [2020-10-27 19:53:29,825 INFO L168 Benchmark]: CDTParser took 0.69 ms. Allocated memory is still 153.1 MB. Free memory is still 125.3 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-27 19:53:29,832 INFO L168 Benchmark]: CACSL2BoogieTranslator took 643.00 ms. Allocated memory is still 153.1 MB. Free memory was 125.9 MB in the beginning and 102.1 MB in the end (delta: 23.7 MB). Peak memory consumption was 24.1 MB. Max. memory is 8.0 GB. [2020-10-27 19:53:29,833 INFO L168 Benchmark]: Boogie Preprocessor took 93.59 ms. Allocated memory is still 153.1 MB. Free memory was 102.1 MB in the beginning and 98.4 MB in the end (delta: 3.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. [2020-10-27 19:53:29,834 INFO L168 Benchmark]: RCFGBuilder took 1176.04 ms. Allocated memory is still 153.1 MB. Free memory was 98.4 MB in the beginning and 70.8 MB in the end (delta: 27.6 MB). Peak memory consumption was 28.4 MB. Max. memory is 8.0 GB. [2020-10-27 19:53:29,834 INFO L168 Benchmark]: TraceAbstraction took 9210.65 ms. Allocated memory was 153.1 MB in the beginning and 270.5 MB in the end (delta: 117.4 MB). Free memory was 70.2 MB in the beginning and 245.3 MB in the end (delta: -175.1 MB). Peak memory consumption was 97.0 MB. Max. memory is 8.0 GB. [2020-10-27 19:53:29,847 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.69 ms. Allocated memory is still 153.1 MB. Free memory is still 125.3 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 643.00 ms. Allocated memory is still 153.1 MB. Free memory was 125.9 MB in the beginning and 102.1 MB in the end (delta: 23.7 MB). Peak memory consumption was 24.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 93.59 ms. Allocated memory is still 153.1 MB. Free memory was 102.1 MB in the beginning and 98.4 MB in the end (delta: 3.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. * RCFGBuilder took 1176.04 ms. Allocated memory is still 153.1 MB. Free memory was 98.4 MB in the beginning and 70.8 MB in the end (delta: 27.6 MB). Peak memory consumption was 28.4 MB. Max. memory is 8.0 GB. * TraceAbstraction took 9210.65 ms. Allocated memory was 153.1 MB in the beginning and 270.5 MB in the end (delta: 117.4 MB). Free memory was 70.2 MB in the beginning and 245.3 MB in the end (delta: -175.1 MB). Peak memory consumption was 97.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 12]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L638] struct list *data = ((void *)0); [L639] COND TRUE __VERIFIER_nondet_int() [L640] struct node *node = malloc(sizeof *node); [L641] COND FALSE !(!node) [L643] node->next = node [L644] node->value = __VERIFIER_nondet_int() [L645] struct list *item = malloc(sizeof *item); [L646] COND FALSE !(!item) [L648] item->slist = node [L649] item->next = data [L650] data = item [L639] COND FALSE !(__VERIFIER_nondet_int()) [L652] COND FALSE !(!data) [L654] CALL inspect_before(data) [L615] COND FALSE !(!(shape)) [L616] shape->next [L616] COND FALSE !(shape->next) [L622] COND FALSE !(!(shape)) [L623] EXPR shape->next [L623] COND FALSE !(!(shape->next == ((void *)0))) [L624] EXPR shape->slist [L624] COND FALSE !(!(shape->slist)) [L625] EXPR shape->slist [L625] EXPR shape->slist->next [L625] COND TRUE !(shape->slist->next == ((void *)0)) [L625] CALL fail() [L565] CALL reach_error() [L12] COND FALSE !(0) [L12] __assert_fail ("0", "merge_sort-1.c", 3, __extension__ __PRETTY_FUNCTION__) - StatisticsResult: Ultimate Automizer benchmark data CFG has 12 procedures, 126 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.0s, OverallIterations: 7, TraceHistogramMax: 2, AutomataDifference: 4.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 677 SDtfs, 804 SDslu, 841 SDs, 0 SdLazy, 1906 SolverSat, 190 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 64 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=120occurred in iteration=0, 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, 6 MinimizatonAttempts, 122 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 4.0s InterpolantComputationTime, 186 NumberOfCodeBlocks, 186 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 145 ConstructedInterpolants, 0 QuantifiedInterpolants, 31265 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 6 PerfectInterpolantSequences, 4/4 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...