/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/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-invariants/mod4.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 22:03:56,334 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 22:03:56,337 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 22:03:56,373 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 22:03:56,374 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 22:03:56,375 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 22:03:56,377 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 22:03:56,379 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 22:03:56,382 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 22:03:56,383 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 22:03:56,385 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 22:03:56,386 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 22:03:56,387 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 22:03:56,388 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 22:03:56,389 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 22:03:56,391 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 22:03:56,392 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 22:03:56,393 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 22:03:56,405 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 22:03:56,407 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 22:03:56,409 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 22:03:56,413 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 22:03:56,415 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 22:03:56,416 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 22:03:56,422 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 22:03:56,433 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 22:03:56,434 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 22:03:56,435 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 22:03:56,439 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 22:03:56,452 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 22:03:56,452 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 22:03:56,454 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 22:03:56,454 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 22:03:56,454 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 22:03:56,454 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 22:03:56,455 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 22:03:56,455 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 22:03:56,455 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 22:03:56,455 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 22:03:56,456 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 22:03:56,456 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 22:03:56,456 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 22:03:56,456 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 22:03:56,457 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 22:03:56,457 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 22:03:56,457 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 22:03:56,458 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 22:03:56,458 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 22:03:56,458 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 22:03:56,458 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 22:03:56,459 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 22:03:56,459 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 22:03:56,829 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 22:03:56,871 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 22:03:56,875 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 22:03:56,876 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 22:03:56,876 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 22:03:56,877 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invariants/mod4.c [2020-10-23 22:03:56,968 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d131f9b4/4241d7d2f9cb48a8bc5b3f2c98e819c7/FLAG9af50ca6e [2020-10-23 22:03:57,627 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 22:03:57,629 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invariants/mod4.c [2020-10-23 22:03:57,636 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d131f9b4/4241d7d2f9cb48a8bc5b3f2c98e819c7/FLAG9af50ca6e [2020-10-23 22:03:57,975 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d131f9b4/4241d7d2f9cb48a8bc5b3f2c98e819c7 [2020-10-23 22:03:57,987 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 22:03:57,997 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 22:03:58,003 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 22:03:58,003 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 22:03:58,007 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 22:03:58,008 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:03:57" (1/1) ... [2020-10-23 22:03:58,012 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ff2b8c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58, skipping insertion in model container [2020-10-23 22:03:58,012 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:03:57" (1/1) ... [2020-10-23 22:03:58,021 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 22:03:58,034 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 22:03:58,188 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 22:03:58,198 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 22:03:58,214 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 22:03:58,228 INFO L208 MainTranslator]: Completed translation [2020-10-23 22:03:58,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58 WrapperNode [2020-10-23 22:03:58,229 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 22:03:58,230 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 22:03:58,231 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 22:03:58,231 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 22:03:58,244 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58" (1/1) ... [2020-10-23 22:03:58,245 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58" (1/1) ... [2020-10-23 22:03:58,251 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58" (1/1) ... [2020-10-23 22:03:58,252 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58" (1/1) ... [2020-10-23 22:03:58,257 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58" (1/1) ... [2020-10-23 22:03:58,262 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58" (1/1) ... [2020-10-23 22:03:58,263 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58" (1/1) ... [2020-10-23 22:03:58,265 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 22:03:58,266 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 22:03:58,266 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 22:03:58,267 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 22:03:58,267 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58" (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 [2020-10-23 22:03:58,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 22:03:58,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 22:03:58,365 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 22:03:58,366 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 22:03:58,366 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 22:03:58,366 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 22:03:58,366 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 22:03:58,366 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 22:03:58,366 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 22:03:58,367 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 22:03:58,367 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 22:03:58,367 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 22:03:58,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 22:03:58,367 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 22:03:58,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 22:03:58,368 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 22:03:58,368 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 22:03:58,368 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 22:03:58,761 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 22:03:58,761 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 22:03:58,763 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:03:58 BoogieIcfgContainer [2020-10-23 22:03:58,764 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 22:03:58,765 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 22:03:58,766 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 22:03:58,769 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 22:03:58,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 10:03:57" (1/3) ... [2020-10-23 22:03:58,771 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2512483e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:03:58, skipping insertion in model container [2020-10-23 22:03:58,771 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:03:58" (2/3) ... [2020-10-23 22:03:58,771 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2512483e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:03:58, skipping insertion in model container [2020-10-23 22:03:58,772 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:03:58" (3/3) ... [2020-10-23 22:03:58,774 INFO L111 eAbstractionObserver]: Analyzing ICFG mod4.c [2020-10-23 22:03:58,788 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 22:03:58,794 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 22:03:58,809 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 22:03:58,839 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 22:03:58,839 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 22:03:58,839 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 22:03:58,839 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 22:03:58,840 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 22:03:58,840 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 22:03:58,840 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 22:03:58,840 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 22:03:58,877 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-10-23 22:03:58,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-10-23 22:03:58,888 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:03:58,889 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:03:58,889 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:03:58,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:03:58,896 INFO L82 PathProgramCache]: Analyzing trace with hash 1544472207, now seen corresponding path program 1 times [2020-10-23 22:03:58,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:03:58,907 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264640859] [2020-10-23 22:03:58,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:03:58,987 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:03:59,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:03:59,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:03:59,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:03:59,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 22:03:59,234 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264640859] [2020-10-23 22:03:59,237 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:03:59,237 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-23 22:03:59,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888039591] [2020-10-23 22:03:59,243 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-23 22:03:59,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:03:59,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-23 22:03:59,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 22:03:59,263 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 3 states. [2020-10-23 22:03:59,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:03:59,448 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2020-10-23 22:03:59,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-23 22:03:59,451 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-10-23 22:03:59,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:03:59,469 INFO L225 Difference]: With dead ends: 54 [2020-10-23 22:03:59,470 INFO L226 Difference]: Without dead ends: 31 [2020-10-23 22:03:59,482 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 22:03:59,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-10-23 22:03:59,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-10-23 22:03:59,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-23 22:03:59,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-10-23 22:03:59,555 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 26 [2020-10-23 22:03:59,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:03:59,556 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-10-23 22:03:59,556 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-23 22:03:59,557 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-10-23 22:03:59,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-23 22:03:59,558 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:03:59,560 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] [2020-10-23 22:03:59,560 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 22:03:59,561 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:03:59,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:03:59,562 INFO L82 PathProgramCache]: Analyzing trace with hash -1541524328, now seen corresponding path program 1 times [2020-10-23 22:03:59,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:03:59,562 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [688608161] [2020-10-23 22:03:59,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:03:59,574 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:03:59,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:03:59,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:03:59,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:03:59,725 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 22:03:59,725 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [688608161] [2020-10-23 22:03:59,726 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:03:59,726 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 22:03:59,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909059389] [2020-10-23 22:03:59,727 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 22:03:59,728 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:03:59,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 22:03:59,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 22:03:59,729 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 6 states. [2020-10-23 22:03:59,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:03:59,951 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-10-23 22:03:59,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 22:03:59,952 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-10-23 22:03:59,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:03:59,953 INFO L225 Difference]: With dead ends: 42 [2020-10-23 22:03:59,953 INFO L226 Difference]: Without dead ends: 35 [2020-10-23 22:03:59,955 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 22:03:59,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-10-23 22:03:59,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2020-10-23 22:03:59,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-10-23 22:03:59,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-10-23 22:03:59,968 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 28 [2020-10-23 22:03:59,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:03:59,969 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-10-23 22:03:59,969 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 22:03:59,969 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-10-23 22:03:59,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-23 22:03:59,970 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:03:59,970 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:03:59,971 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 22:03:59,971 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:03:59,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:03:59,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1480037631, now seen corresponding path program 1 times [2020-10-23 22:03:59,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:03:59,972 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422320847] [2020-10-23 22:03:59,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:04:01,150 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 22:04:02,198 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 22:04:02,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 22:04:02,246 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 22:04:02,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 22:04:02,298 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 22:04:02,352 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-23 22:04:02,353 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 22:04:02,354 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 22:04:02,369 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 10:04:02 BoogieIcfgContainer [2020-10-23 22:04:02,370 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 22:04:02,372 INFO L168 Benchmark]: Toolchain (without parser) took 4381.60 ms. Allocated memory is still 151.0 MB. Free memory was 127.9 MB in the beginning and 116.5 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.7 MB. Max. memory is 8.0 GB. [2020-10-23 22:04:02,373 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 151.0 MB. Free memory was 125.7 MB in the beginning and 125.6 MB in the end (delta: 82.1 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 22:04:02,374 INFO L168 Benchmark]: CACSL2BoogieTranslator took 226.74 ms. Allocated memory is still 151.0 MB. Free memory was 127.3 MB in the beginning and 118.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 22:04:02,375 INFO L168 Benchmark]: Boogie Preprocessor took 34.91 ms. Allocated memory is still 151.0 MB. Free memory was 118.1 MB in the beginning and 116.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 22:04:02,377 INFO L168 Benchmark]: RCFGBuilder took 497.43 ms. Allocated memory is still 151.0 MB. Free memory was 116.7 MB in the beginning and 102.9 MB in the end (delta: 13.8 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2020-10-23 22:04:02,378 INFO L168 Benchmark]: TraceAbstraction took 3604.34 ms. Allocated memory is still 151.0 MB. Free memory was 102.4 MB in the beginning and 116.5 MB in the end (delta: -14.1 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 22:04:02,382 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 151.0 MB. Free memory was 125.7 MB in the beginning and 125.6 MB in the end (delta: 82.1 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 226.74 ms. Allocated memory is still 151.0 MB. Free memory was 127.3 MB in the beginning and 118.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.91 ms. Allocated memory is still 151.0 MB. Free memory was 118.1 MB in the beginning and 116.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 497.43 ms. Allocated memory is still 151.0 MB. Free memory was 116.7 MB in the beginning and 102.9 MB in the end (delta: 13.8 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3604.34 ms. Allocated memory is still 151.0 MB. Free memory was 102.4 MB in the beginning and 116.5 MB in the end (delta: -14.1 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] unsigned int x = 0; [L13] COND TRUE __VERIFIER_nondet_int() [L14] x += 4 [L13] COND FALSE !(__VERIFIER_nondet_int()) [L16] CALL __VERIFIER_assert(!(x % 4)) [L6] COND TRUE !(cond) [L7] CALL reach_error() [L3] __assert_fail("0", "mod4.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 41 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.5s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 33 SDslu, 69 SDs, 0 SdLazy, 62 SolverSat, 8 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=41occurred 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, 2 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...