/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:31:57,503 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:31:57,506 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:31:57,535 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:31:57,535 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:31:57,539 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:31:57,542 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:31:57,558 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:31:57,561 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:31:57,565 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:31:57,567 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:31:57,569 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:31:57,570 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:31:57,575 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:31:57,578 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:31:57,582 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:31:57,583 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:31:57,587 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:31:57,590 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:31:57,598 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:31:57,605 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:31:57,610 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:31:57,612 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:31:57,614 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:31:57,618 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 11:31:57,619 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 11:31:57,619 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 11:31:57,623 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 11:31:57,624 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 11:31:57,627 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 11:31:57,628 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 11:31:57,631 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 11:31:57,632 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 11:31:57,633 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 11:31:57,636 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 11:31:57,636 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 11:31:57,637 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 11:31:57,638 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 11:31:57,638 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:31:57,639 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:31:57,641 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:31:57,643 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 11:31:57,694 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:31:57,695 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:31:57,700 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:31:57,701 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:31:57,701 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:31:57,701 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:31:57,702 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:31:57,702 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:31:57,702 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:31:57,702 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:31:57,703 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:31:57,703 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:31:57,703 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:31:57,706 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:31:57,707 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:31:57,707 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:31:57,707 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:31:57,707 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:31:57,708 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:31:57,708 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:31:57,708 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:31:57,708 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:31:57,709 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:31:57,709 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:31:57,713 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:31:57,713 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:31:57,713 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:31:57,713 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:31:57,714 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:31:57,714 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:31:58,125 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:31:58,144 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:31:58,150 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:31:58,153 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:31:58,154 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:31:58,155 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i [2020-07-20 11:31:58,274 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/93eecf83c/dd5640a8b82841e4a93d1b5378c289cc/FLAG9f61aca54 [2020-07-20 11:31:59,001 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:31:59,002 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i [2020-07-20 11:31:59,027 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/93eecf83c/dd5640a8b82841e4a93d1b5378c289cc/FLAG9f61aca54 [2020-07-20 11:31:59,220 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/93eecf83c/dd5640a8b82841e4a93d1b5378c289cc [2020-07-20 11:31:59,240 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:31:59,245 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:31:59,251 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:31:59,252 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:31:59,258 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:31:59,260 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:31:59" (1/1) ... [2020-07-20 11:31:59,266 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63a32e42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:31:59, skipping insertion in model container [2020-07-20 11:31:59,266 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:31:59" (1/1) ... [2020-07-20 11:31:59,283 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:31:59,363 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:32:00,081 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:32:00,099 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:32:00,161 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:32:00,243 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:32:00,244 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:32:00 WrapperNode [2020-07-20 11:32:00,244 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:32:00,245 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:32:00,245 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:32:00,245 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:32:00,262 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:32:00" (1/1) ... [2020-07-20 11:32:00,263 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:32:00" (1/1) ... [2020-07-20 11:32:00,283 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:32:00" (1/1) ... [2020-07-20 11:32:00,284 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:32:00" (1/1) ... [2020-07-20 11:32:00,302 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:32:00" (1/1) ... [2020-07-20 11:32:00,309 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:32:00" (1/1) ... [2020-07-20 11:32:00,314 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:32:00" (1/1) ... [2020-07-20 11:32:00,321 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:32:00,322 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:32:00,322 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:32:00,322 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:32:00,324 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:32:00" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-20 11:32:00,407 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:32:00,407 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:32:00,408 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-07-20 11:32:00,408 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-07-20 11:32:00,408 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-07-20 11:32:00,408 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2020-07-20 11:32:00,409 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_length [2020-07-20 11:32:00,409 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_destroy [2020-07-20 11:32:00,409 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:32:00,409 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:32:00,410 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:32:00,410 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-07-20 11:32:00,410 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-07-20 11:32:00,410 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-07-20 11:32:00,410 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-07-20 11:32:00,411 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-07-20 11:32:00,411 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-07-20 11:32:00,411 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-07-20 11:32:00,411 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-07-20 11:32:00,411 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-07-20 11:32:00,412 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-07-20 11:32:00,412 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-07-20 11:32:00,412 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-07-20 11:32:00,412 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-07-20 11:32:00,412 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-07-20 11:32:00,412 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-07-20 11:32:00,413 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-07-20 11:32:00,413 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-07-20 11:32:00,413 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-07-20 11:32:00,413 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-07-20 11:32:00,413 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-07-20 11:32:00,413 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-07-20 11:32:00,414 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-07-20 11:32:00,414 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-07-20 11:32:00,414 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-07-20 11:32:00,414 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-07-20 11:32:00,415 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-07-20 11:32:00,415 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-07-20 11:32:00,415 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-07-20 11:32:00,415 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-07-20 11:32:00,415 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-07-20 11:32:00,415 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-07-20 11:32:00,416 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-07-20 11:32:00,416 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-07-20 11:32:00,416 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-07-20 11:32:00,416 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-07-20 11:32:00,416 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-07-20 11:32:00,417 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-07-20 11:32:00,417 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-07-20 11:32:00,417 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-07-20 11:32:00,417 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-07-20 11:32:00,417 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-07-20 11:32:00,417 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-07-20 11:32:00,417 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-07-20 11:32:00,418 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-07-20 11:32:00,418 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-07-20 11:32:00,418 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-07-20 11:32:00,418 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-07-20 11:32:00,418 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-07-20 11:32:00,418 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-07-20 11:32:00,419 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-07-20 11:32:00,419 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-07-20 11:32:00,419 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-07-20 11:32:00,419 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 11:32:00,419 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-07-20 11:32:00,420 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-07-20 11:32:00,420 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-07-20 11:32:00,420 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-07-20 11:32:00,420 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-07-20 11:32:00,420 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-07-20 11:32:00,420 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-07-20 11:32:00,421 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-07-20 11:32:00,421 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 11:32:00,421 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-07-20 11:32:00,421 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-07-20 11:32:00,421 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-07-20 11:32:00,422 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-07-20 11:32:00,422 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-07-20 11:32:00,422 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-07-20 11:32:00,422 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-07-20 11:32:00,422 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-07-20 11:32:00,423 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-07-20 11:32:00,423 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-07-20 11:32:00,423 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-07-20 11:32:00,423 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-07-20 11:32:00,423 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-07-20 11:32:00,423 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-07-20 11:32:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-07-20 11:32:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-07-20 11:32:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-07-20 11:32:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-07-20 11:32:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-07-20 11:32:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-07-20 11:32:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-07-20 11:32:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-07-20 11:32:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-07-20 11:32:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-07-20 11:32:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-07-20 11:32:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-07-20 11:32:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-07-20 11:32:00,426 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-07-20 11:32:00,426 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-07-20 11:32:00,426 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-07-20 11:32:00,426 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-07-20 11:32:00,426 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-07-20 11:32:00,426 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-07-20 11:32:00,427 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-07-20 11:32:00,427 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-07-20 11:32:00,427 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-07-20 11:32:00,427 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-07-20 11:32:00,427 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-07-20 11:32:00,427 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-07-20 11:32:00,428 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-07-20 11:32:00,428 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-07-20 11:32:00,428 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-07-20 11:32:00,428 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-07-20 11:32:00,428 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-07-20 11:32:00,428 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2020-07-20 11:32:00,428 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 11:32:00,429 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 11:32:00,429 INFO L130 BoogieDeclarations]: Found specification of procedure sll_length [2020-07-20 11:32:00,429 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 11:32:00,429 INFO L130 BoogieDeclarations]: Found specification of procedure sll_destroy [2020-07-20 11:32:00,429 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 11:32:00,430 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:32:00,430 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:32:00,430 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:32:00,820 INFO L728 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-07-20 11:32:01,149 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:32:01,149 INFO L295 CfgBuilder]: Removed 4 assume(true) statements. [2020-07-20 11:32:01,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:32:01 BoogieIcfgContainer [2020-07-20 11:32:01,156 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:32:01,158 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:32:01,158 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:32:01,163 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:32:01,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:31:59" (1/3) ... [2020-07-20 11:32:01,165 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@407d693d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:32:01, skipping insertion in model container [2020-07-20 11:32:01,165 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:32:00" (2/3) ... [2020-07-20 11:32:01,166 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@407d693d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:32:01, skipping insertion in model container [2020-07-20 11:32:01,167 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:32:01" (3/3) ... [2020-07-20 11:32:01,169 INFO L109 eAbstractionObserver]: Analyzing ICFG sll_length_check-1.i [2020-07-20 11:32:01,186 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:32:01,199 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:32:01,220 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:32:01,249 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:32:01,249 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:32:01,249 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:32:01,249 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:32:01,249 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:32:01,250 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:32:01,250 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:32:01,250 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:32:01,273 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-07-20 11:32:01,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 11:32:01,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:32:01,284 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:32:01,285 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:32:01,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:32:01,292 INFO L82 PathProgramCache]: Analyzing trace with hash -1666427650, now seen corresponding path program 1 times [2020-07-20 11:32:01,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:32:01,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1292077293] [2020-07-20 11:32:01,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:01,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:32:01,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:32:01,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:32:01,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:32:01,540 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:32:01,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1292077293] [2020-07-20 11:32:01,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:32:01,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:32:01,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178544715] [2020-07-20 11:32:01,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:32:01,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:32:01,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:32:01,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:32:01,583 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2020-07-20 11:32:01,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:32:01,622 INFO L93 Difference]: Finished difference Result 73 states and 93 transitions. [2020-07-20 11:32:01,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:32:01,625 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 23 [2020-07-20 11:32:01,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:32:01,656 INFO L225 Difference]: With dead ends: 73 [2020-07-20 11:32:01,656 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 11:32:01,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:32:01,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 11:32:01,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 11:32:01,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 11:32:01,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-20 11:32:01,727 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 23 [2020-07-20 11:32:01,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:32:01,728 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-20 11:32:01,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:32:01,728 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-20 11:32:01,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:32:01,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:32:01,731 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:32:01,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:01,946 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:32:01,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:32:01,947 INFO L82 PathProgramCache]: Analyzing trace with hash -29727073, now seen corresponding path program 1 times [2020-07-20 11:32:01,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:32:01,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166355210] [2020-07-20 11:32:01,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:02,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:32:02,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:32:02,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:32:02,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:32:02,135 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:32:02,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166355210] [2020-07-20 11:32:02,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:32:02,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:32:02,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825997529] [2020-07-20 11:32:02,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:32:02,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:32:02,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:32:02,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:32:02,139 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-20 11:32:02,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:32:02,221 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2020-07-20 11:32:02,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:32:02,222 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-20 11:32:02,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:32:02,224 INFO L225 Difference]: With dead ends: 45 [2020-07-20 11:32:02,224 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 11:32:02,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:32:02,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 11:32:02,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-07-20 11:32:02,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 11:32:02,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-20 11:32:02,237 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 25 [2020-07-20 11:32:02,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:32:02,238 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-20 11:32:02,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:32:02,238 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-20 11:32:02,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 11:32:02,239 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:32:02,240 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:32:02,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:02,455 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:32:02,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:32:02,456 INFO L82 PathProgramCache]: Analyzing trace with hash -1680455870, now seen corresponding path program 1 times [2020-07-20 11:32:02,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:32:02,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1321054389] [2020-07-20 11:32:02,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:02,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:32:02,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 11:32:02,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:32:02,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:32:02,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:32:02,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:32:02,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1321054389] [2020-07-20 11:32:02,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:32:02,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-20 11:32:02,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834781021] [2020-07-20 11:32:02,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:32:02,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:32:02,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:32:02,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:32:02,904 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 9 states. [2020-07-20 11:32:02,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:32:02,987 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2020-07-20 11:32:02,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:32:02,988 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-07-20 11:32:02,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:32:02,989 INFO L225 Difference]: With dead ends: 48 [2020-07-20 11:32:02,989 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 11:32:02,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:32:02,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 11:32:02,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-07-20 11:32:02,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 11:32:02,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-20 11:32:02,998 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 28 [2020-07-20 11:32:02,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:32:02,999 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-20 11:32:02,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:32:02,999 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-20 11:32:03,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 11:32:03,000 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:32:03,000 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:32:03,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:03,216 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:32:03,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:32:03,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1166508097, now seen corresponding path program 2 times [2020-07-20 11:32:03,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:32:03,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474670730] [2020-07-20 11:32:03,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:03,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:32:03,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:32:03,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:32:03,453 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:32:03,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:32:03,612 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:32:03,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474670730] [2020-07-20 11:32:03,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:32:03,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 11:32:03,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551989299] [2020-07-20 11:32:03,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 11:32:03,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:32:03,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 11:32:03,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:32:03,616 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 10 states. [2020-07-20 11:32:03,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:32:03,700 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2020-07-20 11:32:03,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:32:03,701 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2020-07-20 11:32:03,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:32:03,702 INFO L225 Difference]: With dead ends: 51 [2020-07-20 11:32:03,702 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 11:32:03,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 50 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:32:03,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 11:32:03,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 11:32:03,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 11:32:03,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2020-07-20 11:32:03,711 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 31 [2020-07-20 11:32:03,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:32:03,712 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2020-07-20 11:32:03,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 11:32:03,712 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2020-07-20 11:32:03,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 11:32:03,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:32:03,714 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:32:03,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:03,930 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:32:03,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:32:03,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1706812894, now seen corresponding path program 3 times [2020-07-20 11:32:03,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:32:03,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [332246846] [2020-07-20 11:32:03,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:04,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:32:04,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 11:32:04,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:32:04,130 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 11:32:04,131 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:32:04,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [332246846] [2020-07-20 11:32:04,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:32:04,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-07-20 11:32:04,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247117382] [2020-07-20 11:32:04,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 11:32:04,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:32:04,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 11:32:04,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:32:04,134 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 10 states. [2020-07-20 11:32:04,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:32:04,261 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2020-07-20 11:32:04,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:32:04,264 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 34 [2020-07-20 11:32:04,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:32:04,265 INFO L225 Difference]: With dead ends: 43 [2020-07-20 11:32:04,265 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:32:04,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:32:04,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:32:04,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 11:32:04,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:32:04,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2020-07-20 11:32:04,273 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 34 [2020-07-20 11:32:04,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:32:04,274 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2020-07-20 11:32:04,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 11:32:04,274 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2020-07-20 11:32:04,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-20 11:32:04,276 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:32:04,276 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:32:04,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:04,491 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:32:04,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:32:04,492 INFO L82 PathProgramCache]: Analyzing trace with hash 991320762, now seen corresponding path program 1 times [2020-07-20 11:32:04,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:32:04,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082340733] [2020-07-20 11:32:04,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:04,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:32:04,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-20 11:32:04,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:32:04,734 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-07-20 11:32:04,735 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:32:04,748 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:32:04,750 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:32:04,751 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:19, output treesize:12 [2020-07-20 11:32:05,027 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:32:05,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:32:05,397 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:32:05,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082340733] [2020-07-20 11:32:05,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:32:05,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 21 [2020-07-20 11:32:05,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626789186] [2020-07-20 11:32:05,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:32:05,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:32:05,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:32:05,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:32:05,401 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 21 states. [2020-07-20 11:32:07,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:32:07,759 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2020-07-20 11:32:07,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:32:07,760 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 35 [2020-07-20 11:32:07,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:32:07,761 INFO L225 Difference]: With dead ends: 44 [2020-07-20 11:32:07,762 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 11:32:07,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=103, Invalid=547, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:32:07,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 11:32:07,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-20 11:32:07,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-20 11:32:07,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2020-07-20 11:32:07,785 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 35 [2020-07-20 11:32:07,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:32:07,786 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2020-07-20 11:32:07,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:32:07,787 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2020-07-20 11:32:07,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-20 11:32:07,791 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:32:07,791 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:32:08,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:08,008 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:32:08,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:32:08,008 INFO L82 PathProgramCache]: Analyzing trace with hash -1265881822, now seen corresponding path program 2 times [2020-07-20 11:32:08,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:32:08,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2055410382] [2020-07-20 11:32:08,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:08,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:32:08,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 11:32:08,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:32:08,186 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:32:08,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:32:08,254 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:32:08,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2055410382] [2020-07-20 11:32:08,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:32:08,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-07-20 11:32:08,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929445213] [2020-07-20 11:32:08,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:32:08,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:32:08,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:32:08,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:32:08,258 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 9 states. [2020-07-20 11:32:08,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:32:08,382 INFO L93 Difference]: Finished difference Result 55 states and 62 transitions. [2020-07-20 11:32:08,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:32:08,383 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-07-20 11:32:08,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:32:08,388 INFO L225 Difference]: With dead ends: 55 [2020-07-20 11:32:08,388 INFO L226 Difference]: Without dead ends: 51 [2020-07-20 11:32:08,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:32:08,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-20 11:32:08,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 47. [2020-07-20 11:32:08,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 11:32:08,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-07-20 11:32:08,408 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 36 [2020-07-20 11:32:08,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:32:08,408 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-07-20 11:32:08,409 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:32:08,409 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-07-20 11:32:08,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 11:32:08,411 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:32:08,411 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:32:08,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:08,625 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:32:08,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:32:08,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1775282106, now seen corresponding path program 3 times [2020-07-20 11:32:08,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:32:08,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694156877] [2020-07-20 11:32:08,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:08,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:32:08,743 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:32:08,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:32:08,769 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:32:08,812 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 11:32:08,813 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 11:32:09,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:32:09,110 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:32:09 BoogieIcfgContainer [2020-07-20 11:32:09,111 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:32:09,115 INFO L168 Benchmark]: Toolchain (without parser) took 9871.57 ms. Allocated memory was 136.3 MB in the beginning and 291.0 MB in the end (delta: 154.7 MB). Free memory was 99.2 MB in the beginning and 218.6 MB in the end (delta: -119.4 MB). Peak memory consumption was 35.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:32:09,116 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 11:32:09,117 INFO L168 Benchmark]: CACSL2BoogieTranslator took 993.46 ms. Allocated memory was 136.3 MB in the beginning and 201.3 MB in the end (delta: 65.0 MB). Free memory was 99.0 MB in the beginning and 168.3 MB in the end (delta: -69.3 MB). Peak memory consumption was 25.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:32:09,123 INFO L168 Benchmark]: Boogie Preprocessor took 76.54 ms. Allocated memory is still 201.3 MB. Free memory was 168.3 MB in the beginning and 165.5 MB in the end (delta: 2.8 MB). Peak memory consumption was 2.8 MB. Max. memory is 7.1 GB. [2020-07-20 11:32:09,129 INFO L168 Benchmark]: RCFGBuilder took 833.73 ms. Allocated memory is still 201.3 MB. Free memory was 165.5 MB in the beginning and 122.6 MB in the end (delta: 42.9 MB). Peak memory consumption was 42.9 MB. Max. memory is 7.1 GB. [2020-07-20 11:32:09,130 INFO L168 Benchmark]: TraceAbstraction took 7953.16 ms. Allocated memory was 201.3 MB in the beginning and 291.0 MB in the end (delta: 89.7 MB). Free memory was 121.9 MB in the beginning and 218.6 MB in the end (delta: -96.7 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 11:32:09,144 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 993.46 ms. Allocated memory was 136.3 MB in the beginning and 201.3 MB in the end (delta: 65.0 MB). Free memory was 99.0 MB in the beginning and 168.3 MB in the end (delta: -69.3 MB). Peak memory consumption was 25.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 76.54 ms. Allocated memory is still 201.3 MB. Free memory was 168.3 MB in the beginning and 165.5 MB in the end (delta: 2.8 MB). Peak memory consumption was 2.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 833.73 ms. Allocated memory is still 201.3 MB. Free memory was 165.5 MB in the beginning and 122.6 MB in the end (delta: 42.9 MB). Peak memory consumption was 42.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7953.16 ms. Allocated memory was 201.3 MB in the beginning and 291.0 MB in the end (delta: 89.7 MB). Free memory was 121.9 MB in the beginning and 218.6 MB in the end (delta: -96.7 MB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 602]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L592] int len = 2; VAL [len=2] [L593] len < 32 && __VERIFIER_nondet_int() [L593] len < 32 && __VERIFIER_nondet_int() VAL [__VERIFIER_nondet_int()=0, len=2, len < 32 && __VERIFIER_nondet_int()=0] [L593] COND FALSE !(len < 32 && __VERIFIER_nondet_int()) [L596] CALL, EXPR sll_create(len + 1) VAL [\old(len)=3] [L564] SLL head = ((void *)0); VAL [\old(len)=3, head={0:0}, len=3] [L565] COND TRUE len > 0 [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); VAL [\old(len)=3, head={0:0}, len=3, malloc(sizeof(struct node))={-2:0}, new_head={-2:0}] [L567] COND FALSE !(((void *)0) == new_head) VAL [\old(len)=3, head={0:0}, len=3, malloc(sizeof(struct node))={-2:0}, new_head={-2:0}] [L570] new_head->next = head [L571] head = new_head [L572] len-- VAL [\old(len)=3, head={-2:0}, len=2, malloc(sizeof(struct node))={-2:0}, new_head={-2:0}] [L565] COND TRUE len > 0 [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); VAL [\old(len)=3, head={-2:0}, len=2, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L567] COND FALSE !(((void *)0) == new_head) VAL [\old(len)=3, head={-2:0}, len=2, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L570] new_head->next = head [L571] head = new_head [L572] len-- VAL [\old(len)=3, head={-1:0}, len=1, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L565] COND TRUE len > 0 [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); VAL [\old(len)=3, head={-1:0}, len=1, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L567] COND FALSE !(((void *)0) == new_head) VAL [\old(len)=3, head={-1:0}, len=1, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L570] new_head->next = head [L571] head = new_head [L572] len-- VAL [\old(len)=3, head={-3:0}, len=0, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L565] COND FALSE !(len > 0) VAL [\old(len)=3, head={-3:0}, len=0, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L574] return head; VAL [\old(len)=3, \result={-3:0}, head={-3:0}, len=0, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L596] RET, EXPR sll_create(len + 1) VAL [len=2, sll_create(len + 1)={-3:0}] [L596] SLL s = sll_create(len + 1); [L597] CALL, EXPR sll_length(s) VAL [head={-3:0}] [L577] int len = 0; VAL [head={-3:0}, head={-3:0}, len=0] [L578] COND TRUE \read(head) [L579] len++ [L580] EXPR head->next [L580] head = head->next [L578] COND TRUE \read(head) [L579] len++ [L580] EXPR head->next [L580] head = head->next [L578] COND TRUE \read(head) [L579] len++ [L580] EXPR head->next [L580] head = head->next [L578] COND FALSE !(\read(head)) VAL [head={-3:0}, head={0:0}, len=3] [L582] return len; VAL [\result=3, head={-3:0}, head={0:0}, len=3] [L597] RET, EXPR sll_length(s) VAL [len=2, s={-3:0}, sll_length(s)=3] [L597] COND TRUE len != sll_length(s) [L602] __VERIFIER_error() VAL [len=2, s={-3:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 48 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 7.7s, OverallIterations: 8, TraceHistogramMax: 3, AutomataDifference: 2.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 200 SDtfs, 117 SDslu, 904 SDs, 0 SdLazy, 368 SolverSat, 18 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 2.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 350 GetRequests, 279 SyntacticMatches, 6 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=47occurred in iteration=7, 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, 7 MinimizatonAttempts, 10 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.6s InterpolantComputationTime, 249 NumberOfCodeBlocks, 249 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 331 ConstructedInterpolants, 6 QuantifiedInterpolants, 27600 SizeOfPredicates, 24 NumberOfNonLiveVariables, 928 ConjunctsInSsa, 88 ConjunctsInUnsatCore, 11 InterpolantComputations, 3 PerfectInterpolantSequences, 55/80 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...