/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/list-properties/list-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:20:44,807 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:20:44,811 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:20:44,838 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:20:44,838 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:20:44,840 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:20:44,842 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:20:44,844 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:20:44,846 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:20:44,847 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:20:44,848 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:20:44,849 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:20:44,850 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:20:44,851 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:20:44,852 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:20:44,854 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:20:44,855 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:20:44,856 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:20:44,858 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:20:44,860 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:20:44,864 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:20:44,866 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:20:44,868 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:20:44,869 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:20:44,875 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 10:20:44,875 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 10:20:44,875 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 10:20:44,877 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 10:20:44,880 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 10:20:44,882 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-21 10:20:44,882 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 10:20:44,883 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 10:20:44,884 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 10:20:44,885 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 10:20:44,887 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 10:20:44,887 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 10:20:44,888 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 10:20:44,888 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 10:20:44,888 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:20:44,889 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:20:44,891 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:20:44,892 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 [2020-09-21 10:20:44,955 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:20:44,958 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:20:44,960 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:20:44,960 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:20:44,960 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:20:44,961 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:20:44,961 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:20:44,961 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:20:44,962 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:20:44,962 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:20:44,962 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:20:44,962 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:20:44,962 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:20:44,963 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:20:44,964 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:20:44,964 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:20:44,964 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:20:44,965 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:20:44,965 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:20:44,965 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:20:44,965 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:20:44,965 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:20:44,966 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:20:44,966 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:20:44,966 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:20:44,966 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:20:44,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:20:44,967 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:20:44,967 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:20:44,967 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 -> false [2020-09-21 10:20:45,521 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:20:45,541 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:20:45,546 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:20:45,548 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:20:45,548 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:20:45,550 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-properties/list-2.i [2020-09-21 10:20:45,635 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ffc6e4c0b/4c26934021d64f1db74a6fd0fb5201d8/FLAGe227bfb6f [2020-09-21 10:20:46,287 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:20:46,291 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/list-properties/list-2.i [2020-09-21 10:20:46,324 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ffc6e4c0b/4c26934021d64f1db74a6fd0fb5201d8/FLAGe227bfb6f [2020-09-21 10:20:46,558 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ffc6e4c0b/4c26934021d64f1db74a6fd0fb5201d8 [2020-09-21 10:20:46,572 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:20:46,578 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:20:46,579 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:20:46,580 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:20:46,584 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:20:46,585 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:20:46" (1/1) ... [2020-09-21 10:20:46,590 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19832b0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:46, skipping insertion in model container [2020-09-21 10:20:46,590 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:20:46" (1/1) ... [2020-09-21 10:20:46,600 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:20:46,669 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:20:47,168 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:20:47,182 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:20:47,229 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:20:47,295 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:20:47,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:47 WrapperNode [2020-09-21 10:20:47,296 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:20:47,297 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:20:47,297 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:20:47,297 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:20:47,313 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:47" (1/1) ... [2020-09-21 10:20:47,314 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:47" (1/1) ... [2020-09-21 10:20:47,335 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:47" (1/1) ... [2020-09-21 10:20:47,336 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:47" (1/1) ... [2020-09-21 10:20:47,354 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:47" (1/1) ... [2020-09-21 10:20:47,362 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:47" (1/1) ... [2020-09-21 10:20:47,366 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:47" (1/1) ... [2020-09-21 10:20:47,372 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:20:47,373 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:20:47,373 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:20:47,373 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:20:47,375 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:47" (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 [2020-09-21 10:20:47,449 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:20:47,449 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:20:47,450 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-09-21 10:20:47,450 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-09-21 10:20:47,451 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2020-09-21 10:20:47,451 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2020-09-21 10:20:47,451 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2020-09-21 10:20:47,452 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-09-21 10:20:47,452 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:20:47,452 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:20:47,453 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-21 10:20:47,454 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-09-21 10:20:47,454 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-09-21 10:20:47,454 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-09-21 10:20:47,454 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-09-21 10:20:47,455 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-09-21 10:20:47,455 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-09-21 10:20:47,456 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-09-21 10:20:47,456 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-09-21 10:20:47,456 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-09-21 10:20:47,457 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-09-21 10:20:47,457 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-09-21 10:20:47,457 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-09-21 10:20:47,457 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-09-21 10:20:47,458 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-09-21 10:20:47,460 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-09-21 10:20:47,460 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-09-21 10:20:47,460 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-09-21 10:20:47,460 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-09-21 10:20:47,461 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2020-09-21 10:20:47,461 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2020-09-21 10:20:47,461 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2020-09-21 10:20:47,461 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-09-21 10:20:47,461 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-09-21 10:20:47,461 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-09-21 10:20:47,461 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-09-21 10:20:47,462 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-09-21 10:20:47,462 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-09-21 10:20:47,462 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-09-21 10:20:47,462 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-09-21 10:20:47,462 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-09-21 10:20:47,462 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-09-21 10:20:47,462 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-09-21 10:20:47,462 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-09-21 10:20:47,463 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-09-21 10:20:47,463 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-09-21 10:20:47,463 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-09-21 10:20:47,463 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-09-21 10:20:47,463 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-09-21 10:20:47,463 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-09-21 10:20:47,463 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-09-21 10:20:47,463 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-09-21 10:20:47,463 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-09-21 10:20:47,464 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-09-21 10:20:47,464 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-09-21 10:20:47,464 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-09-21 10:20:47,464 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-09-21 10:20:47,464 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-09-21 10:20:47,464 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-09-21 10:20:47,464 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-09-21 10:20:47,465 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-09-21 10:20:47,465 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-09-21 10:20:47,465 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-09-21 10:20:47,465 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-09-21 10:20:47,465 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-09-21 10:20:47,465 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-09-21 10:20:47,465 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-09-21 10:20:47,466 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-09-21 10:20:47,466 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-09-21 10:20:47,466 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-09-21 10:20:47,466 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-09-21 10:20:47,466 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-09-21 10:20:47,466 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-09-21 10:20:47,467 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-09-21 10:20:47,467 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-21 10:20:47,467 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-09-21 10:20:47,467 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-09-21 10:20:47,467 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-09-21 10:20:47,467 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-09-21 10:20:47,468 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-09-21 10:20:47,468 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-09-21 10:20:47,468 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-09-21 10:20:47,468 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-09-21 10:20:47,468 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-09-21 10:20:47,468 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-09-21 10:20:47,468 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-09-21 10:20:47,469 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-09-21 10:20:47,469 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-09-21 10:20:47,469 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-09-21 10:20:47,469 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-09-21 10:20:47,469 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-09-21 10:20:47,469 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-09-21 10:20:47,470 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-09-21 10:20:47,470 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-09-21 10:20:47,470 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-09-21 10:20:47,470 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-09-21 10:20:47,470 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-09-21 10:20:47,470 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-09-21 10:20:47,470 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-09-21 10:20:47,470 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-09-21 10:20:47,470 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-09-21 10:20:47,471 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-09-21 10:20:47,471 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-09-21 10:20:47,471 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-09-21 10:20:47,471 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-09-21 10:20:47,471 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-09-21 10:20:47,471 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-09-21 10:20:47,471 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-09-21 10:20:47,471 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-09-21 10:20:47,471 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-09-21 10:20:47,471 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-09-21 10:20:47,472 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-09-21 10:20:47,472 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-09-21 10:20:47,472 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-09-21 10:20:47,472 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-09-21 10:20:47,472 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-09-21 10:20:47,472 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-09-21 10:20:47,472 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-09-21 10:20:47,472 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-09-21 10:20:47,473 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:20:47,473 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-09-21 10:20:47,473 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-21 10:20:47,473 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-09-21 10:20:47,473 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-09-21 10:20:47,473 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-21 10:20:47,474 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:20:47,474 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:20:47,474 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 10:20:47,892 INFO L732 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-09-21 10:20:48,116 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:20:48,117 INFO L295 CfgBuilder]: Removed 4 assume(true) statements. [2020-09-21 10:20:48,126 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:20:48 BoogieIcfgContainer [2020-09-21 10:20:48,127 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:20:48,130 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:20:48,133 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:20:48,138 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:20:48,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:20:46" (1/3) ... [2020-09-21 10:20:48,139 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2751c123 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:20:48, skipping insertion in model container [2020-09-21 10:20:48,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:47" (2/3) ... [2020-09-21 10:20:48,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2751c123 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:20:48, skipping insertion in model container [2020-09-21 10:20:48,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:20:48" (3/3) ... [2020-09-21 10:20:48,145 INFO L109 eAbstractionObserver]: Analyzing ICFG list-2.i [2020-09-21 10:20:48,156 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:20:48,167 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:20:48,188 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:20:48,217 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:20:48,217 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:20:48,217 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:20:48,217 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:20:48,217 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:20:48,218 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:20:48,218 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:20:48,218 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:20:48,239 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-09-21 10:20:48,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-21 10:20:48,247 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:48,248 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:20:48,248 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:48,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:48,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1613857984, now seen corresponding path program 1 times [2020-09-21 10:20:48,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:48,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1756305292] [2020-09-21 10:20:48,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:48,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:48,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:48,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:48,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:48,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1756305292] [2020-09-21 10:20:48,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:20:48,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 10:20:48,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730818984] [2020-09-21 10:20:48,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 10:20:48,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:48,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 10:20:48,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:20:48,514 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2020-09-21 10:20:48,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:48,646 INFO L93 Difference]: Finished difference Result 56 states and 74 transitions. [2020-09-21 10:20:48,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:20:48,649 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-09-21 10:20:48,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:48,660 INFO L225 Difference]: With dead ends: 56 [2020-09-21 10:20:48,660 INFO L226 Difference]: Without dead ends: 25 [2020-09-21 10:20:48,665 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 [2020-09-21 10:20:48,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-09-21 10:20:48,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-09-21 10:20:48,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 10:20:48,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-09-21 10:20:48,732 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 16 [2020-09-21 10:20:48,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:48,733 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-09-21 10:20:48,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 10:20:48,733 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-09-21 10:20:48,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:20:48,734 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:48,734 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] [2020-09-21 10:20:48,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:20:48,734 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:48,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:48,735 INFO L82 PathProgramCache]: Analyzing trace with hash -1642379272, now seen corresponding path program 1 times [2020-09-21 10:20:48,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:48,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [64058661] [2020-09-21 10:20:48,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:48,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:48,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:48,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:48,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:48,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [64058661] [2020-09-21 10:20:48,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:20:48,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-21 10:20:48,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190411846] [2020-09-21 10:20:48,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:20:48,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:48,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:20:48,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:20:48,876 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 6 states. [2020-09-21 10:20:49,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:49,030 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2020-09-21 10:20:49,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:20:49,031 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-09-21 10:20:49,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:49,034 INFO L225 Difference]: With dead ends: 50 [2020-09-21 10:20:49,035 INFO L226 Difference]: Without dead ends: 46 [2020-09-21 10:20:49,036 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 [2020-09-21 10:20:49,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-21 10:20:49,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 34. [2020-09-21 10:20:49,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-21 10:20:49,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2020-09-21 10:20:49,050 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 20 [2020-09-21 10:20:49,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:49,051 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2020-09-21 10:20:49,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:20:49,051 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2020-09-21 10:20:49,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:20:49,054 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:49,055 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] [2020-09-21 10:20:49,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:20:49,055 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:49,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:49,056 INFO L82 PathProgramCache]: Analyzing trace with hash -2024806125, now seen corresponding path program 1 times [2020-09-21 10:20:49,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:49,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012100877] [2020-09-21 10:20:49,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:49,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:49,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:49,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012100877] [2020-09-21 10:20:49,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:20:49,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-21 10:20:49,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423748942] [2020-09-21 10:20:49,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:20:49,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:49,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:20:49,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:20:49,201 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand 6 states. [2020-09-21 10:20:49,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:49,328 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2020-09-21 10:20:49,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:20:49,329 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-09-21 10:20:49,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:49,330 INFO L225 Difference]: With dead ends: 52 [2020-09-21 10:20:49,330 INFO L226 Difference]: Without dead ends: 44 [2020-09-21 10:20:49,331 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 [2020-09-21 10:20:49,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-21 10:20:49,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 32. [2020-09-21 10:20:49,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-21 10:20:49,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2020-09-21 10:20:49,338 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 22 [2020-09-21 10:20:49,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:49,339 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2020-09-21 10:20:49,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:20:49,339 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2020-09-21 10:20:49,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:20:49,340 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:49,340 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] [2020-09-21 10:20:49,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:20:49,341 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:49,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:49,341 INFO L82 PathProgramCache]: Analyzing trace with hash -1000103149, now seen corresponding path program 1 times [2020-09-21 10:20:49,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:49,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [341498998] [2020-09-21 10:20:49,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:49,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:49,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,429 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:49,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [341498998] [2020-09-21 10:20:49,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:20:49,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-21 10:20:49,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685696119] [2020-09-21 10:20:49,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:20:49,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:49,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:20:49,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:20:49,431 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 6 states. [2020-09-21 10:20:49,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:49,549 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2020-09-21 10:20:49,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:20:49,550 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-09-21 10:20:49,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:49,551 INFO L225 Difference]: With dead ends: 52 [2020-09-21 10:20:49,551 INFO L226 Difference]: Without dead ends: 41 [2020-09-21 10:20:49,552 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 [2020-09-21 10:20:49,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-09-21 10:20:49,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 29. [2020-09-21 10:20:49,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 10:20:49,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-09-21 10:20:49,558 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 22 [2020-09-21 10:20:49,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:49,558 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-09-21 10:20:49,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:20:49,558 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-09-21 10:20:49,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:20:49,559 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:49,559 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] [2020-09-21 10:20:49,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:20:49,560 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:49,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:49,560 INFO L82 PathProgramCache]: Analyzing trace with hash 422878047, now seen corresponding path program 1 times [2020-09-21 10:20:49,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:49,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301537870] [2020-09-21 10:20:49,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:49,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:49,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:49,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301537870] [2020-09-21 10:20:49,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:49,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:20:49,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510548940] [2020-09-21 10:20:49,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:20:49,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:49,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:20:49,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:20:49,744 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 9 states. [2020-09-21 10:20:50,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:50,029 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2020-09-21 10:20:50,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:20:50,029 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-09-21 10:20:50,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:50,030 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:20:50,030 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 10:20:50,031 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 [2020-09-21 10:20:50,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 10:20:50,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-09-21 10:20:50,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-21 10:20:50,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-09-21 10:20:50,037 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 24 [2020-09-21 10:20:50,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:50,037 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-09-21 10:20:50,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:20:50,038 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-09-21 10:20:50,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:20:50,039 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:50,039 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] [2020-09-21 10:20:50,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:20:50,039 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:50,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:50,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1286279711, now seen corresponding path program 1 times [2020-09-21 10:20:50,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:50,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459492176] [2020-09-21 10:20:50,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:50,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:50,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,166 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:50,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459492176] [2020-09-21 10:20:50,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:50,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:20:50,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557874530] [2020-09-21 10:20:50,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:20:50,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:50,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:20:50,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:20:50,169 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 9 states. [2020-09-21 10:20:50,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:50,492 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2020-09-21 10:20:50,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:20:50,493 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-09-21 10:20:50,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:50,495 INFO L225 Difference]: With dead ends: 63 [2020-09-21 10:20:50,495 INFO L226 Difference]: Without dead ends: 59 [2020-09-21 10:20:50,496 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 [2020-09-21 10:20:50,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-09-21 10:20:50,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 47. [2020-09-21 10:20:50,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-21 10:20:50,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-09-21 10:20:50,508 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 24 [2020-09-21 10:20:50,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:50,509 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-09-21 10:20:50,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:20:50,509 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-09-21 10:20:50,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-21 10:20:50,510 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:50,510 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] [2020-09-21 10:20:50,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:20:50,511 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:50,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:50,511 INFO L82 PathProgramCache]: Analyzing trace with hash -562710342, now seen corresponding path program 1 times [2020-09-21 10:20:50,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:50,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323806606] [2020-09-21 10:20:50,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:50,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:50,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,691 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:50,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323806606] [2020-09-21 10:20:50,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:50,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:20:50,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658098937] [2020-09-21 10:20:50,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:20:50,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:50,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:20:50,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:20:50,693 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 10 states. [2020-09-21 10:20:51,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:51,032 INFO L93 Difference]: Finished difference Result 67 states and 77 transitions. [2020-09-21 10:20:51,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:20:51,032 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-09-21 10:20:51,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:51,033 INFO L225 Difference]: With dead ends: 67 [2020-09-21 10:20:51,034 INFO L226 Difference]: Without dead ends: 63 [2020-09-21 10:20:51,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:20:51,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-09-21 10:20:51,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 51. [2020-09-21 10:20:51,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-09-21 10:20:51,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 60 transitions. [2020-09-21 10:20:51,049 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 60 transitions. Word has length 26 [2020-09-21 10:20:51,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:51,049 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 60 transitions. [2020-09-21 10:20:51,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:20:51,050 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 60 transitions. [2020-09-21 10:20:51,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:20:51,054 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:51,054 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] [2020-09-21 10:20:51,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:20:51,055 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:51,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:51,055 INFO L82 PathProgramCache]: Analyzing trace with hash 449917269, now seen corresponding path program 1 times [2020-09-21 10:20:51,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:51,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [717926007] [2020-09-21 10:20:51,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:51,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:51,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,321 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:51,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [717926007] [2020-09-21 10:20:51,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:51,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:20:51,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565187805] [2020-09-21 10:20:51,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:20:51,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:51,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:20:51,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:20:51,324 INFO L87 Difference]: Start difference. First operand 51 states and 60 transitions. Second operand 10 states. [2020-09-21 10:20:51,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:51,652 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2020-09-21 10:20:51,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:20:51,652 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-09-21 10:20:51,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:51,654 INFO L225 Difference]: With dead ends: 69 [2020-09-21 10:20:51,654 INFO L226 Difference]: Without dead ends: 59 [2020-09-21 10:20:51,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:20:51,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-09-21 10:20:51,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 42. [2020-09-21 10:20:51,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-21 10:20:51,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2020-09-21 10:20:51,664 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 28 [2020-09-21 10:20:51,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:51,664 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2020-09-21 10:20:51,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:20:51,664 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2020-09-21 10:20:51,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:20:51,665 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:51,665 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] [2020-09-21 10:20:51,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:20:51,666 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:51,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:51,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1474620245, now seen corresponding path program 2 times [2020-09-21 10:20:51,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:51,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [989995386] [2020-09-21 10:20:51,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:51,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:51,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,845 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:51,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [989995386] [2020-09-21 10:20:51,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:51,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:20:51,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263422487] [2020-09-21 10:20:51,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:20:51,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:51,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:20:51,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:20:51,848 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand 10 states. [2020-09-21 10:20:52,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:52,109 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-09-21 10:20:52,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:20:52,109 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-09-21 10:20:52,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:52,110 INFO L225 Difference]: With dead ends: 62 [2020-09-21 10:20:52,110 INFO L226 Difference]: Without dead ends: 49 [2020-09-21 10:20:52,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:20:52,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-21 10:20:52,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 37. [2020-09-21 10:20:52,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-21 10:20:52,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2020-09-21 10:20:52,116 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 28 [2020-09-21 10:20:52,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:52,116 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2020-09-21 10:20:52,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:20:52,117 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2020-09-21 10:20:52,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:20:52,117 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:52,118 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] [2020-09-21 10:20:52,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:20:52,118 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:52,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:52,118 INFO L82 PathProgramCache]: Analyzing trace with hash -149429434, now seen corresponding path program 2 times [2020-09-21 10:20:52,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:52,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989559613] [2020-09-21 10:20:52,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:52,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:52,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:52,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:52,361 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:52,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989559613] [2020-09-21 10:20:52,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:52,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:20:52,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824398384] [2020-09-21 10:20:52,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:20:52,363 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:52,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:20:52,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:20:52,364 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand 13 states. [2020-09-21 10:20:52,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:52,769 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-09-21 10:20:52,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:20:52,770 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2020-09-21 10:20:52,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:52,771 INFO L225 Difference]: With dead ends: 62 [2020-09-21 10:20:52,771 INFO L226 Difference]: Without dead ends: 58 [2020-09-21 10:20:52,772 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 [2020-09-21 10:20:52,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-09-21 10:20:52,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2020-09-21 10:20:52,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-09-21 10:20:52,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2020-09-21 10:20:52,777 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 28 [2020-09-21 10:20:52,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:52,778 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2020-09-21 10:20:52,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:20:52,778 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2020-09-21 10:20:52,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:20:52,779 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:52,779 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] [2020-09-21 10:20:52,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:20:52,780 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:52,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:52,780 INFO L82 PathProgramCache]: Analyzing trace with hash 150272518, now seen corresponding path program 1 times [2020-09-21 10:20:52,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:52,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410231318] [2020-09-21 10:20:52,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:52,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:52,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:52,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:52,968 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:52,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410231318] [2020-09-21 10:20:52,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:52,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:20:52,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929630890] [2020-09-21 10:20:52,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:20:52,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:52,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:20:52,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:20:52,972 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand 13 states. [2020-09-21 10:20:53,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:53,546 INFO L93 Difference]: Finished difference Result 75 states and 86 transitions. [2020-09-21 10:20:53,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:20:53,546 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2020-09-21 10:20:53,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:53,547 INFO L225 Difference]: With dead ends: 75 [2020-09-21 10:20:53,548 INFO L226 Difference]: Without dead ends: 71 [2020-09-21 10:20:53,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:20:53,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-09-21 10:20:53,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 50. [2020-09-21 10:20:53,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-21 10:20:53,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2020-09-21 10:20:53,557 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 28 [2020-09-21 10:20:53,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:53,558 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2020-09-21 10:20:53,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:20:53,558 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2020-09-21 10:20:53,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:20:53,559 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:53,559 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] [2020-09-21 10:20:53,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:20:53,559 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:53,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:53,560 INFO L82 PathProgramCache]: Analyzing trace with hash -1819088671, now seen corresponding path program 1 times [2020-09-21 10:20:53,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:53,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96462766] [2020-09-21 10:20:53,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:53,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:53,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:53,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:53,774 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:53,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96462766] [2020-09-21 10:20:53,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:53,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:20:53,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287597806] [2020-09-21 10:20:53,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:20:53,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:53,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:20:53,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:20:53,777 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand 13 states. [2020-09-21 10:20:54,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:54,250 INFO L93 Difference]: Finished difference Result 77 states and 88 transitions. [2020-09-21 10:20:54,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:20:54,250 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-09-21 10:20:54,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:54,251 INFO L225 Difference]: With dead ends: 77 [2020-09-21 10:20:54,252 INFO L226 Difference]: Without dead ends: 69 [2020-09-21 10:20:54,252 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 [2020-09-21 10:20:54,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-09-21 10:20:54,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 59. [2020-09-21 10:20:54,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-09-21 10:20:54,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2020-09-21 10:20:54,259 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 30 [2020-09-21 10:20:54,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:54,259 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2020-09-21 10:20:54,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:20:54,259 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2020-09-21 10:20:54,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:20:54,260 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:54,261 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] [2020-09-21 10:20:54,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:20:54,261 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:54,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:54,261 INFO L82 PathProgramCache]: Analyzing trace with hash -794385695, now seen corresponding path program 3 times [2020-09-21 10:20:54,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:54,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697376935] [2020-09-21 10:20:54,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:54,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:54,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:54,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:54,543 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:20:54,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697376935] [2020-09-21 10:20:54,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:54,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:20:54,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79853751] [2020-09-21 10:20:54,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:20:54,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:54,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:20:54,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:20:54,545 INFO L87 Difference]: Start difference. First operand 59 states and 68 transitions. Second operand 13 states. [2020-09-21 10:20:55,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:55,147 INFO L93 Difference]: Finished difference Result 84 states and 97 transitions. [2020-09-21 10:20:55,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:20:55,147 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-09-21 10:20:55,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:55,148 INFO L225 Difference]: With dead ends: 84 [2020-09-21 10:20:55,148 INFO L226 Difference]: Without dead ends: 78 [2020-09-21 10:20:55,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:20:55,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-09-21 10:20:55,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 66. [2020-09-21 10:20:55,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-09-21 10:20:55,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 77 transitions. [2020-09-21 10:20:55,156 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 77 transitions. Word has length 30 [2020-09-21 10:20:55,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:55,156 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 77 transitions. [2020-09-21 10:20:55,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:20:55,156 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 77 transitions. [2020-09-21 10:20:55,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:20:55,159 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:55,159 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] [2020-09-21 10:20:55,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:20:55,159 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:55,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:55,160 INFO L82 PathProgramCache]: Analyzing trace with hash -1568321631, now seen corresponding path program 1 times [2020-09-21 10:20:55,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:55,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72445957] [2020-09-21 10:20:55,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:55,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-21 10:20:55,185 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-21 10:20:55,186 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-21 10:20:55,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 10:20:55,212 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 10:20:55 BoogieIcfgContainer [2020-09-21 10:20:55,213 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 10:20:55,216 INFO L168 Benchmark]: Toolchain (without parser) took 8640.72 ms. Allocated memory was 140.5 MB in the beginning and 319.8 MB in the end (delta: 179.3 MB). Free memory was 102.6 MB in the beginning and 228.3 MB in the end (delta: -125.7 MB). Peak memory consumption was 53.6 MB. Max. memory is 7.1 GB. [2020-09-21 10:20:55,217 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.6 MB in the end (delta: 419.4 kB). Peak memory consumption was 419.4 kB. Max. memory is 7.1 GB. [2020-09-21 10:20:55,218 INFO L168 Benchmark]: CACSL2BoogieTranslator took 716.93 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 101.8 MB in the beginning and 169.2 MB in the end (delta: -67.5 MB). Peak memory consumption was 24.2 MB. Max. memory is 7.1 GB. [2020-09-21 10:20:55,219 INFO L168 Benchmark]: Boogie Preprocessor took 75.90 ms. Allocated memory is still 202.4 MB. Free memory was 168.3 MB in the beginning and 165.2 MB in the end (delta: 3.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 7.1 GB. [2020-09-21 10:20:55,220 INFO L168 Benchmark]: RCFGBuilder took 754.29 ms. Allocated memory is still 202.4 MB. Free memory was 165.2 MB in the beginning and 120.8 MB in the end (delta: 44.4 MB). Peak memory consumption was 44.4 MB. Max. memory is 7.1 GB. [2020-09-21 10:20:55,221 INFO L168 Benchmark]: TraceAbstraction took 7083.43 ms. Allocated memory was 202.4 MB in the beginning and 319.8 MB in the end (delta: 117.4 MB). Free memory was 119.9 MB in the beginning and 228.3 MB in the end (delta: -108.4 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2020-09-21 10:20:55,224 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.6 MB in the end (delta: 419.4 kB). Peak memory consumption was 419.4 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 716.93 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 101.8 MB in the beginning and 169.2 MB in the end (delta: -67.5 MB). Peak memory consumption was 24.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 75.90 ms. Allocated memory is still 202.4 MB. Free memory was 168.3 MB in the beginning and 165.2 MB in the end (delta: 3.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 754.29 ms. Allocated memory is still 202.4 MB. Free memory was 165.2 MB in the beginning and 120.8 MB in the end (delta: 44.4 MB). Peak memory consumption was 44.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7083.43 ms. Allocated memory was 202.4 MB in the beginning and 319.8 MB in the end (delta: 117.4 MB). Free memory was 119.9 MB in the beginning and 228.3 MB in the end (delta: -108.4 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 546]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L521] List a = (List) malloc(sizeof(struct node)); [L522] COND FALSE !(a == 0) [L523] List t; [L524] List p = a; [L525] COND TRUE __VERIFIER_nondet_int() [L526] p->h = 1 [L527] t = (List) malloc(sizeof(struct node)) [L528] COND FALSE !(t == 0) [L529] p->n = t [L530] EXPR p->n [L530] p = p->n [L525] COND FALSE !(__VERIFIER_nondet_int()) [L532] COND TRUE __VERIFIER_nondet_int() [L533] p->h = 2 [L534] t = (List) malloc(sizeof(struct node)) [L535] COND FALSE !(t == 0) [L536] p->n = t [L537] EXPR p->n [L537] p = p->n [L532] COND FALSE !(__VERIFIER_nondet_int()) [L539] p->h = 3 [L540] p = a [L541] EXPR p->h [L541] COND FALSE !(p->h == 2) [L543] EXPR p->h [L543] COND TRUE p->h == 1 [L544] EXPR p->n [L544] p = p->n [L543] EXPR p->h [L543] COND FALSE !(p->h == 1) [L545] EXPR p->h [L545] COND TRUE p->h != 3 [L546] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 51 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.9s, OverallIterations: 14, TraceHistogramMax: 3, AutomataDifference: 4.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 265 SDtfs, 552 SDslu, 1158 SDs, 0 SdLazy, 2018 SolverSat, 252 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 208 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 2.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=66occurred in iteration=13, 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, 13 MinimizatonAttempts, 154 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.9s InterpolantComputationTime, 356 NumberOfCodeBlocks, 356 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 313 ConstructedInterpolants, 0 QuantifiedInterpolants, 70246 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 13 InterpolantComputations, 4 PerfectInterpolantSequences, 12/58 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...