/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/nec20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-b7b32d2 [2021-02-21 16:25:59,306 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-21 16:25:59,310 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-21 16:25:59,374 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-21 16:25:59,408 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-21 16:25:59,410 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-21 16:25:59,413 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-21 16:25:59,415 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-21 16:25:59,419 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-21 16:25:59,420 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-21 16:25:59,428 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-21 16:25:59,433 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-21 16:25:59,437 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-21 16:25:59,439 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-21 16:25:59,441 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-21 16:25:59,443 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-21 16:25:59,465 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-21 16:25:59,480 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-21 16:25:59,481 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-21 16:25:59,482 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-21 16:25:59,483 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 [2021-02-21 16:25:59,542 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-21 16:25:59,542 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-21 16:25:59,547 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-02-21 16:25:59,547 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-02-21 16:25:59,547 INFO L138 SettingsManager]: * Use SBE=true [2021-02-21 16:25:59,547 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-21 16:25:59,548 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-21 16:25:59,548 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-21 16:25:59,548 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-21 16:25:59,549 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-21 16:25:59,550 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-21 16:25:59,550 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-21 16:25:59,551 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-21 16:25:59,551 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-21 16:25:59,551 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-21 16:25:59,551 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-21 16:25:59,551 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-21 16:25:59,552 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-21 16:25:59,552 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-02-21 16:25:59,552 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-21 16:25:59,553 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-21 16:25:59,553 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-21 16:25:59,553 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-02-21 16:25:59,554 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-02-21 16:25:59,554 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-02-21 16:25:59,554 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-02-21 16:25:59,554 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-21 16:25:59,554 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-02-21 16:25:59,555 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-21 16:26:00,018 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-21 16:26:00,069 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-21 16:26:00,073 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-21 16:26:00,074 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-21 16:26:00,075 INFO L275 PluginConnector]: CDTParser initialized [2021-02-21 16:26:00,076 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/nec20.c [2021-02-21 16:26:00,162 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15db0d9e2/eb86ad2c9936492aaeeab4f1e9e860e3/FLAGfc0d575f4 [2021-02-21 16:26:00,768 INFO L306 CDTParser]: Found 1 translation units. [2021-02-21 16:26:00,768 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/nec20.c [2021-02-21 16:26:00,776 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15db0d9e2/eb86ad2c9936492aaeeab4f1e9e860e3/FLAGfc0d575f4 [2021-02-21 16:26:01,138 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15db0d9e2/eb86ad2c9936492aaeeab4f1e9e860e3 [2021-02-21 16:26:01,141 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-21 16:26:01,156 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-21 16:26:01,161 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-21 16:26:01,161 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-21 16:26:01,166 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-21 16:26:01,168 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.02 04:26:01" (1/1) ... [2021-02-21 16:26:01,171 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b06d00c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01, skipping insertion in model container [2021-02-21 16:26:01,171 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.02 04:26:01" (1/1) ... [2021-02-21 16:26:01,183 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-21 16:26:01,205 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-21 16:26:01,396 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/nec20.c[356,369] [2021-02-21 16:26:01,416 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-21 16:26:01,431 INFO L203 MainTranslator]: Completed pre-run [2021-02-21 16:26:01,447 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/nec20.c[356,369] [2021-02-21 16:26:01,454 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-21 16:26:01,473 INFO L208 MainTranslator]: Completed translation [2021-02-21 16:26:01,474 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01 WrapperNode [2021-02-21 16:26:01,474 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-21 16:26:01,475 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-21 16:26:01,476 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-21 16:26:01,476 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-21 16:26:01,492 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01" (1/1) ... [2021-02-21 16:26:01,493 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01" (1/1) ... [2021-02-21 16:26:01,502 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01" (1/1) ... [2021-02-21 16:26:01,503 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01" (1/1) ... [2021-02-21 16:26:01,510 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01" (1/1) ... [2021-02-21 16:26:01,515 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01" (1/1) ... [2021-02-21 16:26:01,517 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01" (1/1) ... [2021-02-21 16:26:01,519 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-21 16:26:01,521 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-21 16:26:01,521 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-21 16:26:01,521 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-21 16:26:01,522 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01" (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 [2021-02-21 16:26:01,641 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-21 16:26:01,642 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-21 16:26:01,642 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-21 16:26:01,642 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-21 16:26:01,643 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-21 16:26:01,643 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-21 16:26:01,643 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-21 16:26:01,644 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-21 16:26:01,645 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-21 16:26:01,646 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-02-21 16:26:01,646 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-21 16:26:01,647 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2021-02-21 16:26:01,648 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-21 16:26:01,648 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-21 16:26:01,650 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-21 16:26:01,650 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-21 16:26:01,651 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-21 16:26:01,651 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-21 16:26:01,651 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-21 16:26:02,250 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-21 16:26:02,250 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-21 16:26:02,256 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.02 04:26:02 BoogieIcfgContainer [2021-02-21 16:26:02,259 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-21 16:26:02,261 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-21 16:26:02,262 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-21 16:26:02,269 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-21 16:26:02,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.02 04:26:01" (1/3) ... [2021-02-21 16:26:02,274 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@353cd39c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.02 04:26:02, skipping insertion in model container [2021-02-21 16:26:02,274 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:26:01" (2/3) ... [2021-02-21 16:26:02,278 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@353cd39c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.02 04:26:02, skipping insertion in model container [2021-02-21 16:26:02,278 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.02 04:26:02" (3/3) ... [2021-02-21 16:26:02,280 INFO L111 eAbstractionObserver]: Analyzing ICFG nec20.c [2021-02-21 16:26:02,299 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-02-21 16:26:02,310 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-21 16:26:02,361 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-21 16:26:02,423 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-21 16:26:02,424 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-21 16:26:02,424 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-02-21 16:26:02,424 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-21 16:26:02,424 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-21 16:26:02,424 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-21 16:26:02,424 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-21 16:26:02,425 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-21 16:26:02,444 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2021-02-21 16:26:02,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-02-21 16:26:02,451 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 16:26:02,452 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-21 16:26:02,452 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 16:26:02,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 16:26:02,460 INFO L82 PathProgramCache]: Analyzing trace with hash 1512797340, now seen corresponding path program 1 times [2021-02-21 16:26:02,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-21 16:26:02,473 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743922199] [2021-02-21 16:26:02,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 16:26:02,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:26:02,728 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:26:02,730 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:26:02,732 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:26:02,734 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-21 16:26:02,761 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:26:02,763 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-21 16:26:02,791 WARN L141 QuantifierPusher]: treesize reduction 12, result has 7.7 percent of original size [2021-02-21 16:26:02,793 WARN L147 QuantifierPusher]: treesize reduction 12, result has 7.7 percent of original size 1 [2021-02-21 16:26:02,795 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:26:02,796 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:26:02,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-21 16:26:02,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:26:02,912 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:26:02,916 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:26:02,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-21 16:26:02,925 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743922199] [2021-02-21 16:26:02,926 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-21 16:26:02,926 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-02-21 16:26:02,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701365094] [2021-02-21 16:26:02,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-21 16:26:02,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-21 16:26:02,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-21 16:26:02,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-02-21 16:26:02,967 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 5 states. [2021-02-21 16:26:03,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-21 16:26:03,475 INFO L93 Difference]: Finished difference Result 53 states and 68 transitions. [2021-02-21 16:26:03,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-02-21 16:26:03,478 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2021-02-21 16:26:03,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-21 16:26:03,488 INFO L225 Difference]: With dead ends: 53 [2021-02-21 16:26:03,488 INFO L226 Difference]: Without dead ends: 22 [2021-02-21 16:26:03,492 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-02-21 16:26:03,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-02-21 16:26:03,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2021-02-21 16:26:03,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2021-02-21 16:26:03,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-02-21 16:26:03,543 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-02-21 16:26:03,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-21 16:26:03,543 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-02-21 16:26:03,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-02-21 16:26:03,544 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-02-21 16:26:03,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-02-21 16:26:03,545 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 16:26:03,545 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-21 16:26:03,545 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-21 16:26:03,545 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 16:26:03,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 16:26:03,546 INFO L82 PathProgramCache]: Analyzing trace with hash -2102111586, now seen corresponding path program 1 times [2021-02-21 16:26:03,547 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-21 16:26:03,547 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949597964] [2021-02-21 16:26:03,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 16:26:03,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:26:03,647 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:26:03,648 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:26:03,651 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:26:03,652 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-21 16:26:03,673 WARN L141 QuantifierPusher]: treesize reduction 2, result has 96.0 percent of original size [2021-02-21 16:26:03,676 WARN L147 QuantifierPusher]: treesize reduction 2, result has 96.0 percent of original size 48 [2021-02-21 16:26:03,773 WARN L141 QuantifierPusher]: treesize reduction 5, result has 88.4 percent of original size [2021-02-21 16:26:03,778 WARN L147 QuantifierPusher]: treesize reduction 5, result has 88.4 percent of original size 38 [2021-02-21 16:26:03,786 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:26:03,788 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:26:03,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-21 16:26:03,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:26:03,873 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:26:03,874 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:26:03,877 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-21 16:26:03,878 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949597964] [2021-02-21 16:26:03,878 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-21 16:26:03,878 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-02-21 16:26:03,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151383073] [2021-02-21 16:26:03,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-21 16:26:03,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-21 16:26:03,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-21 16:26:03,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-02-21 16:26:03,882 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2021-02-21 16:26:04,160 WARN L202 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 41 [2021-02-21 16:26:04,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-21 16:26:04,257 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2021-02-21 16:26:04,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-02-21 16:26:04,258 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2021-02-21 16:26:04,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-21 16:26:04,259 INFO L225 Difference]: With dead ends: 29 [2021-02-21 16:26:04,260 INFO L226 Difference]: Without dead ends: 23 [2021-02-21 16:26:04,261 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-02-21 16:26:04,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-02-21 16:26:04,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 17. [2021-02-21 16:26:04,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2021-02-21 16:26:04,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-02-21 16:26:04,269 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2021-02-21 16:26:04,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-21 16:26:04,269 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-02-21 16:26:04,269 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-02-21 16:26:04,269 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-02-21 16:26:04,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-02-21 16:26:04,270 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 16:26:04,270 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-21 16:26:04,271 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-21 16:26:04,271 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 16:26:04,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 16:26:04,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1230699476, now seen corresponding path program 1 times [2021-02-21 16:26:04,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-21 16:26:04,272 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175784913] [2021-02-21 16:26:04,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 16:26:04,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-21 16:26:04,304 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-21 16:26:04,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-21 16:26:04,348 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-21 16:26:04,376 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-02-21 16:26:04,376 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-21 16:26:04,376 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-21 16:26:04,409 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.02 04:26:04 BoogieIcfgContainer [2021-02-21 16:26:04,410 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-21 16:26:04,411 INFO L168 Benchmark]: Toolchain (without parser) took 3267.18 ms. Allocated memory is still 156.2 MB. Free memory was 132.0 MB in the beginning and 126.4 MB in the end (delta: 5.6 MB). Peak memory consumption was 6.8 MB. Max. memory is 8.0 GB. [2021-02-21 16:26:04,412 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 156.2 MB. Free memory is still 129.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-21 16:26:04,413 INFO L168 Benchmark]: CACSL2BoogieTranslator took 313.89 ms. Allocated memory is still 156.2 MB. Free memory was 130.9 MB in the beginning and 120.9 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-02-21 16:26:04,414 INFO L168 Benchmark]: Boogie Preprocessor took 44.15 ms. Allocated memory is still 156.2 MB. Free memory was 120.7 MB in the beginning and 119.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-21 16:26:04,415 INFO L168 Benchmark]: RCFGBuilder took 738.71 ms. Allocated memory is still 156.2 MB. Free memory was 119.3 MB in the beginning and 138.2 MB in the end (delta: -18.8 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-02-21 16:26:04,416 INFO L168 Benchmark]: TraceAbstraction took 2148.68 ms. Allocated memory is still 156.2 MB. Free memory was 137.7 MB in the beginning and 126.4 MB in the end (delta: 11.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 8.0 GB. [2021-02-21 16:26:04,423 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 156.2 MB. Free memory is still 129.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 313.89 ms. Allocated memory is still 156.2 MB. Free memory was 130.9 MB in the beginning and 120.9 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 44.15 ms. Allocated memory is still 156.2 MB. Free memory was 120.7 MB in the beginning and 119.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 738.71 ms. Allocated memory is still 156.2 MB. Free memory was 119.3 MB in the beginning and 138.2 MB in the end (delta: -18.8 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2148.68 ms. Allocated memory is still 156.2 MB. Free memory was 137.7 MB in the beginning and 126.4 MB in the end (delta: 11.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] int b; VAL [\old(b)=261, b=0] [L15] _Bool k=__VERIFIER_nondet_bool(); [L16] unsigned int i,n,j; [L17] int a[1025]; VAL [b=0, k=1] [L19] COND TRUE \read(k) [L20] n=0 VAL [b=0, k=1, n=0] [L25] i=0 [L26] j=__VERIFIER_nondet_uint() [L27] COND FALSE !(j > 10000) VAL [b=0, i=0, j=-4294966273, k=1, n=0] [L30] COND TRUE i <= n [L31] i++ [L32] j= j +2 VAL [b=0, i=1, j=-4294966271, k=1, n=0] [L30] COND FALSE !(i <= n) VAL [b=0, i=1, j=-4294966271, k=1, n=0] [L35] a[i]=0 VAL [b=0, i=1, j=-4294966271, k=1, n=0] [L36] CALL __VERIFIER_assert(j<1025) VAL [\old(cond)=0, b=0] [L7] COND TRUE !(cond) VAL [\old(cond)=0, b=0, cond=0] [L8] reach_error() VAL [\old(cond)=0, b=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.9s, OverallIterations: 3, TraceHistogramMax: 1, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 45 SDtfs, 53 SDslu, 25 SDs, 0 SdLazy, 73 SolverSat, 9 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=25occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 9 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 46 NumberOfCodeBlocks, 46 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 28 ConstructedInterpolants, 0 QuantifiedInterpolants, 2016 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 0/0 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...