/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/automizer/acceleratedInterpolation/acceleratedInterpolationWernerOverapprox_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-24 04:47:46,255 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-24 04:47:46,258 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-24 04:47:46,304 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-24 04:47:46,336 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-24 04:47:46,339 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-24 04:47:46,341 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-24 04:47:46,343 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-24 04:47:46,360 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-24 04:47:46,362 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-24 04:47:46,370 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-24 04:47:46,375 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-24 04:47:46,380 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-24 04:47:46,382 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-24 04:47:46,384 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-24 04:47:46,387 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-24 04:47:46,396 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-24 04:47:46,410 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-24 04:47:46,411 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-24 04:47:46,412 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-24 04:47:46,413 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationWernerOverapprox_32.epf [2021-02-24 04:47:46,440 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-24 04:47:46,440 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-24 04:47:46,446 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-24 04:47:46,446 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-24 04:47:46,446 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-24 04:47:46,446 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-24 04:47:46,447 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-24 04:47:46,447 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-24 04:47:46,447 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-24 04:47:46,447 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-24 04:47:46,449 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-24 04:47:46,449 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-24 04:47:46,449 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-24 04:47:46,450 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-24 04:47:46,450 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-24 04:47:46,450 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-24 04:47:46,450 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-24 04:47:46,451 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-24 04:47:46,451 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-24 04:47:46,451 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-24 04:47:46,451 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-24 04:47:46,452 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-24 04:47:46,452 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=WERNER_OVERAPPROX [2021-02-24 04:47:46,452 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-24 04:47:46,898 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-24 04:47:46,925 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-24 04:47:46,928 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-24 04:47:46,929 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-24 04:47:46,930 INFO L275 PluginConnector]: CDTParser initialized [2021-02-24 04:47:46,931 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2021-02-24 04:47:47,009 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63d0a83b2/1e3a8c0957f9423ab138ece3bf6579b7/FLAGf79fd271d [2021-02-24 04:47:47,661 INFO L306 CDTParser]: Found 1 translation units. [2021-02-24 04:47:47,662 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2021-02-24 04:47:47,669 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63d0a83b2/1e3a8c0957f9423ab138ece3bf6579b7/FLAGf79fd271d [2021-02-24 04:47:48,053 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63d0a83b2/1e3a8c0957f9423ab138ece3bf6579b7 [2021-02-24 04:47:48,056 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-24 04:47:48,071 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-24 04:47:48,076 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-24 04:47:48,076 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-24 04:47:48,081 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-24 04:47:48,082 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 04:47:48" (1/1) ... [2021-02-24 04:47:48,083 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@195c3177 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48, skipping insertion in model container [2021-02-24 04:47:48,083 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 04:47:48" (1/1) ... [2021-02-24 04:47:48,093 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-24 04:47:48,112 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-24 04:47:48,280 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_1-1.c[321,334] [2021-02-24 04:47:48,292 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-24 04:47:48,302 INFO L203 MainTranslator]: Completed pre-run [2021-02-24 04:47:48,316 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_1-1.c[321,334] [2021-02-24 04:47:48,319 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-24 04:47:48,336 INFO L208 MainTranslator]: Completed translation [2021-02-24 04:47:48,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48 WrapperNode [2021-02-24 04:47:48,337 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-24 04:47:48,338 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-24 04:47:48,338 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-24 04:47:48,339 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-24 04:47:48,352 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48" (1/1) ... [2021-02-24 04:47:48,353 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48" (1/1) ... [2021-02-24 04:47:48,361 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48" (1/1) ... [2021-02-24 04:47:48,361 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48" (1/1) ... [2021-02-24 04:47:48,367 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48" (1/1) ... [2021-02-24 04:47:48,371 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48" (1/1) ... [2021-02-24 04:47:48,372 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48" (1/1) ... [2021-02-24 04:47:48,374 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-24 04:47:48,376 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-24 04:47:48,376 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-24 04:47:48,376 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-24 04:47:48,377 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48" (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 [2021-02-24 04:47:48,472 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-24 04:47:48,472 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-24 04:47:48,473 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-24 04:47:48,473 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-24 04:47:48,473 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-24 04:47:48,473 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-24 04:47:48,473 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-24 04:47:48,473 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-24 04:47:48,474 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-24 04:47:48,474 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-24 04:47:48,474 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-24 04:47:48,474 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-24 04:47:48,474 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-24 04:47:48,474 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-24 04:47:48,475 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-24 04:47:48,475 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-24 04:47:48,475 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-24 04:47:48,808 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-24 04:47:48,808 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-24 04:47:48,812 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 04:47:48 BoogieIcfgContainer [2021-02-24 04:47:48,813 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-24 04:47:48,820 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-24 04:47:48,820 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-24 04:47:48,831 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-24 04:47:48,832 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.02 04:47:48" (1/3) ... [2021-02-24 04:47:48,835 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52843c3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 04:47:48, skipping insertion in model container [2021-02-24 04:47:48,836 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 04:47:48" (2/3) ... [2021-02-24 04:47:48,836 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52843c3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 04:47:48, skipping insertion in model container [2021-02-24 04:47:48,836 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 04:47:48" (3/3) ... [2021-02-24 04:47:48,842 INFO L111 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2021-02-24 04:47:48,897 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-24 04:47:48,909 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-24 04:47:48,969 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-24 04:47:48,997 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-24 04:47:48,998 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-24 04:47:48,998 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-24 04:47:48,998 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-24 04:47:48,998 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-24 04:47:48,998 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-24 04:47:48,998 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-24 04:47:48,999 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-24 04:47:49,015 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2021-02-24 04:47:49,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-02-24 04:47:49,030 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 04:47:49,033 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-24 04:47:49,033 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 04:47:49,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 04:47:49,049 INFO L82 PathProgramCache]: Analyzing trace with hash 645207053, now seen corresponding path program 1 times [2021-02-24 04:47:49,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 04:47:49,063 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [161537168] [2021-02-24 04:47:49,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 04:47:49,161 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-24 04:47:49,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 04:47:49,404 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:49,406 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 04:47:49,408 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:49,408 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-24 04:47:49,422 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:49,425 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 04:47:49,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-24 04:47:49,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-24 04:47:49,533 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:49,535 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-24 04:47:49,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-24 04:47:49,548 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [161537168] [2021-02-24 04:47:49,552 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-24 04:47:49,552 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-24 04:47:49,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059433471] [2021-02-24 04:47:49,560 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-02-24 04:47:49,560 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-24 04:47:49,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-02-24 04:47:49,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-02-24 04:47:49,582 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 4 states. [2021-02-24 04:47:49,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-24 04:47:49,814 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-02-24 04:47:49,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-02-24 04:47:49,816 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2021-02-24 04:47:49,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-24 04:47:49,830 INFO L225 Difference]: With dead ends: 46 [2021-02-24 04:47:49,830 INFO L226 Difference]: Without dead ends: 28 [2021-02-24 04:47:49,839 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-02-24 04:47:49,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-02-24 04:47:49,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25. [2021-02-24 04:47:49,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2021-02-24 04:47:49,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2021-02-24 04:47:49,918 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 19 [2021-02-24 04:47:49,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-24 04:47:49,919 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2021-02-24 04:47:49,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-02-24 04:47:49,919 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2021-02-24 04:47:49,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-24 04:47:49,921 INFO L414 BasicCegarLoop]: Found error trace [2021-02-24 04:47:49,921 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] [2021-02-24 04:47:49,922 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-24 04:47:49,922 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-24 04:47:49,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-24 04:47:49,924 INFO L82 PathProgramCache]: Analyzing trace with hash -567626551, now seen corresponding path program 1 times [2021-02-24 04:47:49,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-24 04:47:49,925 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [149004688] [2021-02-24 04:47:49,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-24 04:47:50,056 WARN L202 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 31 [2021-02-24 04:47:50,077 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,091 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-02-24 04:47:50,098 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,101 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-02-24 04:47:50,118 WARN L141 QuantifierPusher]: treesize reduction 6, result has 76.0 percent of original size [2021-02-24 04:47:50,136 INFO L723 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2021-02-24 04:47:50,141 INFO L730 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-02-24 04:47:50,144 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,151 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 27 [2021-02-24 04:47:50,154 WARN L147 QuantifierPusher]: treesize reduction 6, result has 76.0 percent of original size 19 [2021-02-24 04:47:50,161 WARN L141 QuantifierPusher]: treesize reduction 5, result has 86.8 percent of original size [2021-02-24 04:47:50,165 WARN L147 QuantifierPusher]: treesize reduction 5, result has 86.8 percent of original size 33 [2021-02-24 04:47:50,167 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,171 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-02-24 04:47:50,173 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,178 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-02-24 04:47:50,186 WARN L141 QuantifierPusher]: treesize reduction 6, result has 76.0 percent of original size [2021-02-24 04:47:50,188 INFO L723 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2021-02-24 04:47:50,191 INFO L730 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-02-24 04:47:50,194 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,199 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 27 [2021-02-24 04:47:50,202 WARN L147 QuantifierPusher]: treesize reduction 6, result has 76.0 percent of original size 19 [2021-02-24 04:47:50,207 WARN L141 QuantifierPusher]: treesize reduction 5, result has 86.8 percent of original size [2021-02-24 04:47:50,211 WARN L147 QuantifierPusher]: treesize reduction 5, result has 86.8 percent of original size 33 [2021-02-24 04:47:50,214 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,218 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 20 [2021-02-24 04:47:50,221 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,224 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 20 [2021-02-24 04:47:50,234 WARN L141 QuantifierPusher]: treesize reduction 8, result has 72.4 percent of original size [2021-02-24 04:47:50,237 INFO L723 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2021-02-24 04:47:50,239 INFO L730 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-02-24 04:47:50,243 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-24 04:47:50,249 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-02-24 04:47:50,251 WARN L147 QuantifierPusher]: treesize reduction 8, result has 72.4 percent of original size 21 [2021-02-24 04:47:50,255 WARN L141 QuantifierPusher]: treesize reduction 5, result has 87.8 percent of original size [2021-02-24 04:47:50,260 WARN L147 QuantifierPusher]: treesize reduction 5, result has 87.8 percent of original size 36 [2021-02-24 04:47:50,261 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-02-24 04:47:50,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-24 04:47:50,339 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-24 04:47:50,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-24 04:47:50,370 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-24 04:47:50,407 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-24 04:47:50,407 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-24 04:47:50,413 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-02-24 04:47:50,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.02 04:47:50 BoogieIcfgContainer [2021-02-24 04:47:50,431 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-24 04:47:50,433 INFO L168 Benchmark]: Toolchain (without parser) took 2373.80 ms. Allocated memory is still 151.0 MB. Free memory was 127.6 MB in the beginning and 128.0 MB in the end (delta: -453.5 kB). Peak memory consumption was 468.6 kB. Max. memory is 8.0 GB. [2021-02-24 04:47:50,434 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 151.0 MB. Free memory is still 124.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-24 04:47:50,435 INFO L168 Benchmark]: CACSL2BoogieTranslator took 261.27 ms. Allocated memory is still 151.0 MB. Free memory was 126.6 MB in the beginning and 117.0 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-24 04:47:50,437 INFO L168 Benchmark]: Boogie Preprocessor took 36.40 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 115.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-24 04:47:50,438 INFO L168 Benchmark]: RCFGBuilder took 439.59 ms. Allocated memory is still 151.0 MB. Free memory was 115.4 MB in the beginning and 102.6 MB in the end (delta: 12.8 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-02-24 04:47:50,443 INFO L168 Benchmark]: TraceAbstraction took 1611.38 ms. Allocated memory is still 151.0 MB. Free memory was 102.2 MB in the beginning and 128.0 MB in the end (delta: -25.8 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-02-24 04:47:50,455 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 151.0 MB. Free memory is still 124.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 261.27 ms. Allocated memory is still 151.0 MB. Free memory was 126.6 MB in the beginning and 117.0 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 36.40 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 115.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 439.59 ms. Allocated memory is still 151.0 MB. Free memory was 115.4 MB in the beginning and 102.6 MB in the end (delta: 12.8 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1611.38 ms. Allocated memory is still 151.0 MB. Free memory was 102.2 MB in the beginning and 128.0 MB in the end (delta: -25.8 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] unsigned int x = 1; [L14] unsigned int y = 0; [L16] COND TRUE y < 1024 [L17] x = 0 [L18] y++ [L16] COND FALSE !(y < 1024) [L21] CALL __VERIFIER_assert(x == 0) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.4s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 21 SDslu, 19 SDs, 0 SdLazy, 25 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=31occurred 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, 1 MinimizatonAttempts, 3 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...