/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-new/half.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-b7b32d2 [2021-02-22 02:23:54,459 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-22 02:23:54,462 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-22 02:23:54,503 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-22 02:23:54,574 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationWernerOverapprox_32.epf [2021-02-22 02:23:54,616 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-22 02:23:54,616 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-22 02:23:54,622 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-22 02:23:54,622 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-22 02:23:54,622 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-22 02:23:54,622 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-22 02:23:54,623 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-22 02:23:54,623 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-22 02:23:54,623 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-22 02:23:54,623 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-22 02:23:54,624 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-22 02:23:54,625 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-22 02:23:54,625 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-22 02:23:54,625 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-22 02:23:54,626 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-22 02:23:54,627 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-22 02:23:54,627 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-22 02:23:54,627 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-22 02:23:54,627 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-22 02:23:54,628 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-22 02:23:54,628 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-22 02:23:54,628 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-22 02:23:54,628 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=WERNER_OVERAPPROX [2021-02-22 02:23:54,628 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-22 02:23:55,055 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-22 02:23:55,083 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-22 02:23:55,087 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-22 02:23:55,088 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-22 02:23:55,089 INFO L275 PluginConnector]: CDTParser initialized [2021-02-22 02:23:55,090 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/half.i [2021-02-22 02:23:55,165 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c96d386c/498127e9db6a4ab7a56af09a79ddf923/FLAG3d861e623 [2021-02-22 02:23:55,813 INFO L306 CDTParser]: Found 1 translation units. [2021-02-22 02:23:55,814 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/half.i [2021-02-22 02:23:55,821 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c96d386c/498127e9db6a4ab7a56af09a79ddf923/FLAG3d861e623 [2021-02-22 02:23:56,172 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c96d386c/498127e9db6a4ab7a56af09a79ddf923 [2021-02-22 02:23:56,175 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-22 02:23:56,190 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-22 02:23:56,191 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-22 02:23:56,192 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-22 02:23:56,196 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-22 02:23:56,197 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 02:23:56" (1/1) ... [2021-02-22 02:23:56,199 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21b82832 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56, skipping insertion in model container [2021-02-22 02:23:56,199 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 02:23:56" (1/1) ... [2021-02-22 02:23:56,208 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-22 02:23:56,227 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-22 02:23:56,398 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-new/half.i[891,904] [2021-02-22 02:23:56,412 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 02:23:56,423 INFO L203 MainTranslator]: Completed pre-run [2021-02-22 02:23:56,440 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-new/half.i[891,904] [2021-02-22 02:23:56,445 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 02:23:56,464 INFO L208 MainTranslator]: Completed translation [2021-02-22 02:23:56,464 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56 WrapperNode [2021-02-22 02:23:56,465 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-22 02:23:56,466 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-22 02:23:56,466 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-22 02:23:56,466 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-22 02:23:56,481 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56" (1/1) ... [2021-02-22 02:23:56,482 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56" (1/1) ... [2021-02-22 02:23:56,490 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56" (1/1) ... [2021-02-22 02:23:56,491 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56" (1/1) ... [2021-02-22 02:23:56,498 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56" (1/1) ... [2021-02-22 02:23:56,503 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56" (1/1) ... [2021-02-22 02:23:56,505 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56" (1/1) ... [2021-02-22 02:23:56,508 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-22 02:23:56,509 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-22 02:23:56,509 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-22 02:23:56,510 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-22 02:23:56,511 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56" (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 [2021-02-22 02:23:56,621 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-22 02:23:56,621 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-22 02:23:56,622 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-22 02:23:56,622 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-02-22 02:23:56,622 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-22 02:23:56,622 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-22 02:23:56,622 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-22 02:23:56,623 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-22 02:23:56,623 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-02-22 02:23:56,623 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-02-22 02:23:56,623 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-22 02:23:56,623 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-22 02:23:56,624 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-02-22 02:23:56,624 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-22 02:23:56,624 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-02-22 02:23:56,624 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-22 02:23:56,624 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-22 02:23:56,624 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-22 02:23:56,625 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-22 02:23:56,625 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-22 02:23:56,625 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-22 02:23:56,625 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-22 02:23:56,887 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-22 02:23:56,887 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-22 02:23:56,889 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 02:23:56 BoogieIcfgContainer [2021-02-22 02:23:56,890 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-22 02:23:56,893 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-22 02:23:56,893 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-22 02:23:56,899 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-22 02:23:56,899 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.02 02:23:56" (1/3) ... [2021-02-22 02:23:56,901 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@413d3994 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 02:23:56, skipping insertion in model container [2021-02-22 02:23:56,901 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 02:23:56" (2/3) ... [2021-02-22 02:23:56,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@413d3994 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 02:23:56, skipping insertion in model container [2021-02-22 02:23:56,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 02:23:56" (3/3) ... [2021-02-22 02:23:56,905 INFO L111 eAbstractionObserver]: Analyzing ICFG half.i [2021-02-22 02:23:56,915 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-22 02:23:56,921 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-22 02:23:56,959 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-22 02:23:56,986 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-22 02:23:56,987 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-22 02:23:56,987 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-22 02:23:56,987 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-22 02:23:56,987 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-22 02:23:56,988 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-22 02:23:56,988 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-22 02:23:56,988 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-22 02:23:57,008 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2021-02-22 02:23:57,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-02-22 02:23:57,035 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:23:57,036 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] [2021-02-22 02:23:57,036 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:23:57,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:23:57,054 INFO L82 PathProgramCache]: Analyzing trace with hash 535719879, now seen corresponding path program 1 times [2021-02-22 02:23:57,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:23:57,085 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1171800761] [2021-02-22 02:23:57,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:23:57,208 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 02:23:57,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:23:57,354 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:57,357 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:23:57,359 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:57,361 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:23:57,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 02:23:57,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:23:57,473 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:57,474 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:23:57,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-22 02:23:57,484 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1171800761] [2021-02-22 02:23:57,486 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 02:23:57,486 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-22 02:23:57,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469614731] [2021-02-22 02:23:57,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-22 02:23:57,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 02:23:57,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-22 02:23:57,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-22 02:23:57,514 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 3 states. [2021-02-22 02:23:57,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 02:23:57,611 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2021-02-22 02:23:57,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-22 02:23:57,614 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2021-02-22 02:23:57,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 02:23:57,624 INFO L225 Difference]: With dead ends: 52 [2021-02-22 02:23:57,624 INFO L226 Difference]: Without dead ends: 31 [2021-02-22 02:23:57,628 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 [2021-02-22 02:23:57,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-02-22 02:23:57,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-02-22 02:23:57,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2021-02-22 02:23:57,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-02-22 02:23:57,688 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 23 [2021-02-22 02:23:57,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 02:23:57,688 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-02-22 02:23:57,688 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-02-22 02:23:57,689 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-02-22 02:23:57,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-02-22 02:23:57,690 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:23:57,690 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] [2021-02-22 02:23:57,691 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-22 02:23:57,691 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:23:57,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:23:57,693 INFO L82 PathProgramCache]: Analyzing trace with hash 520943543, now seen corresponding path program 1 times [2021-02-22 02:23:57,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:23:57,693 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447889924] [2021-02-22 02:23:57,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:23:57,698 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 02:23:57,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:23:57,862 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:57,863 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:23:57,864 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:57,864 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 02:23:57,881 WARN L141 QuantifierPusher]: treesize reduction 4, result has 66.7 percent of original size [2021-02-22 02:23:57,882 WARN L147 QuantifierPusher]: treesize reduction 4, result has 66.7 percent of original size 8 [2021-02-22 02:23:57,893 WARN L141 QuantifierPusher]: treesize reduction 4, result has 75.0 percent of original size [2021-02-22 02:23:57,894 WARN L147 QuantifierPusher]: treesize reduction 4, result has 75.0 percent of original size 12 [2021-02-22 02:23:57,909 WARN L141 QuantifierPusher]: treesize reduction 8, result has 60.0 percent of original size [2021-02-22 02:23:57,911 WARN L147 QuantifierPusher]: treesize reduction 8, result has 60.0 percent of original size 12 [2021-02-22 02:23:57,931 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:57,932 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-22 02:23:57,941 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:57,942 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-22 02:23:57,951 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:57,952 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:23:57,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 02:23:57,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 02:23:57,996 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:57,997 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:23:58,000 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-22 02:23:58,001 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447889924] [2021-02-22 02:23:58,001 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 02:23:58,001 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-02-22 02:23:58,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063113810] [2021-02-22 02:23:58,003 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-22 02:23:58,003 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 02:23:58,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-22 02:23:58,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-02-22 02:23:58,005 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 9 states. [2021-02-22 02:23:58,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 02:23:58,465 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-02-22 02:23:58,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-22 02:23:58,466 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2021-02-22 02:23:58,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 02:23:58,469 INFO L225 Difference]: With dead ends: 51 [2021-02-22 02:23:58,469 INFO L226 Difference]: Without dead ends: 35 [2021-02-22 02:23:58,474 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-02-22 02:23:58,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-02-22 02:23:58,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2021-02-22 02:23:58,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2021-02-22 02:23:58,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-02-22 02:23:58,506 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 23 [2021-02-22 02:23:58,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 02:23:58,507 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-02-22 02:23:58,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-02-22 02:23:58,507 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-02-22 02:23:58,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-02-22 02:23:58,508 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 02:23:58,509 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, 1, 1, 1] [2021-02-22 02:23:58,509 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-22 02:23:58,509 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 02:23:58,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 02:23:58,510 INFO L82 PathProgramCache]: Analyzing trace with hash 430650734, now seen corresponding path program 1 times [2021-02-22 02:23:58,516 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 02:23:58,517 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [614287838] [2021-02-22 02:23:58,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 02:23:58,588 WARN L141 QuantifierPusher]: treesize reduction 2, result has 84.6 percent of original size [2021-02-22 02:23:58,617 WARN L147 QuantifierPusher]: treesize reduction 2, result has 84.6 percent of original size 11 [2021-02-22 02:23:58,621 WARN L141 QuantifierPusher]: treesize reduction 28, result has 9.7 percent of original size [2021-02-22 02:23:58,622 WARN L147 QuantifierPusher]: treesize reduction 28, result has 9.7 percent of original size 3 [2021-02-22 02:23:58,624 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:58,625 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 6 [2021-02-22 02:23:58,627 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:58,628 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 6 [2021-02-22 02:23:58,630 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:58,631 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:23:58,633 WARN L141 QuantifierPusher]: treesize reduction 11, result has 56.0 percent of original size [2021-02-22 02:23:58,635 WARN L147 QuantifierPusher]: treesize reduction 11, result has 56.0 percent of original size 14 [2021-02-22 02:23:58,637 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:58,638 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 6 [2021-02-22 02:23:58,639 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:58,640 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 6 [2021-02-22 02:23:58,642 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 02:23:58,643 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 02:23:58,645 WARN L141 QuantifierPusher]: treesize reduction 11, result has 56.0 percent of original size [2021-02-22 02:23:58,647 WARN L147 QuantifierPusher]: treesize reduction 11, result has 56.0 percent of original size 14 [2021-02-22 02:23:58,647 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-02-22 02:23:58,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-22 02:23:58,670 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-22 02:23:58,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-22 02:23:58,694 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-22 02:23:58,723 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-22 02:23:58,723 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-22 02:23:58,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-22 02:23:58,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.02 02:23:58 BoogieIcfgContainer [2021-02-22 02:23:58,741 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-22 02:23:58,743 INFO L168 Benchmark]: Toolchain (without parser) took 2565.19 ms. Allocated memory is still 154.1 MB. Free memory was 131.3 MB in the beginning and 101.9 MB in the end (delta: 29.4 MB). Peak memory consumption was 29.8 MB. Max. memory is 8.0 GB. [2021-02-22 02:23:58,743 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 154.1 MB. Free memory is still 130.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-22 02:23:58,744 INFO L168 Benchmark]: CACSL2BoogieTranslator took 273.75 ms. Allocated memory is still 154.1 MB. Free memory was 130.2 MB in the beginning and 120.6 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-22 02:23:58,745 INFO L168 Benchmark]: Boogie Preprocessor took 42.24 ms. Allocated memory is still 154.1 MB. Free memory was 120.6 MB in the beginning and 119.2 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-02-22 02:23:58,746 INFO L168 Benchmark]: RCFGBuilder took 380.90 ms. Allocated memory is still 154.1 MB. Free memory was 119.2 MB in the beginning and 103.6 MB in the end (delta: 15.5 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-02-22 02:23:58,747 INFO L168 Benchmark]: TraceAbstraction took 1848.63 ms. Allocated memory is still 154.1 MB. Free memory was 103.3 MB in the beginning and 101.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.5 MB. Max. memory is 8.0 GB. [2021-02-22 02:23:58,750 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 154.1 MB. Free memory is still 130.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 273.75 ms. Allocated memory is still 154.1 MB. Free memory was 130.2 MB in the beginning and 120.6 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 42.24 ms. Allocated memory is still 154.1 MB. Free memory was 120.6 MB in the beginning and 119.2 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 8.0 GB. * RCFGBuilder took 380.90 ms. Allocated memory is still 154.1 MB. Free memory was 119.2 MB in the beginning and 103.6 MB in the end (delta: 15.5 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1848.63 ms. Allocated memory is still 154.1 MB. Free memory was 103.3 MB in the beginning and 101.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 19]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L25] int i = 0; [L26] int n = 0; [L27] int k = __VERIFIER_nondet_int(); [L28] COND FALSE !(!(k <= 1000000 && k >= -1000000)) [L29] i = 0 [L29] COND TRUE i < 2*k [L30] COND TRUE i % 2 == 0 [L31] n ++ [L29] i++ [L29] COND FALSE !(i < 2*k) [L34] CALL __VERIFIER_assert(k < 0 || n == k) [L18] COND TRUE !(cond) [L19] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 50 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.7s, OverallIterations: 3, TraceHistogramMax: 1, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 67 SDtfs, 66 SDslu, 54 SDs, 0 SdLazy, 102 SolverSat, 7 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=40occurred 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...