java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/loop-new/half.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-10 02:12:38,507 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-10 02:12:38,510 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-10 02:12:38,527 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-10 02:12:38,571 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-10 02:12:38,586 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-10 02:12:38,586 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-10 02:12:38,587 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-10 02:12:38,587 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-10 02:12:38,588 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-10 02:12:38,588 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-10 02:12:38,588 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-10 02:12:38,588 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-10 02:12:38,588 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-10 02:12:38,589 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-10 02:12:38,590 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-10 02:12:38,590 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-10 02:12:38,590 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-10 02:12:38,591 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-10 02:12:38,591 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-10 02:12:38,591 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-10 02:12:38,592 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-10 02:12:38,592 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-10 02:12:38,592 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-10 02:12:38,592 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-10 02:12:38,593 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-10 02:12:38,593 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-10 02:12:38,593 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-10 02:12:38,593 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-10 02:12:38,594 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-10 02:12:38,594 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-10 02:12:38,594 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-10 02:12:38,594 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-10 02:12:38,595 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-10 02:12:38,595 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-10 02:12:38,629 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-10 02:12:38,643 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-10 02:12:38,649 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-10 02:12:38,651 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-10 02:12:38,652 INFO L275 PluginConnector]: CDTParser initialized [2019-09-10 02:12:38,652 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/half.i [2019-09-10 02:12:38,714 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a10962e63/a7c9e3707e5b41af8736b24f60eb3c8e/FLAGcad32a955 [2019-09-10 02:12:39,151 INFO L306 CDTParser]: Found 1 translation units. [2019-09-10 02:12:39,154 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/half.i [2019-09-10 02:12:39,160 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a10962e63/a7c9e3707e5b41af8736b24f60eb3c8e/FLAGcad32a955 [2019-09-10 02:12:39,548 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a10962e63/a7c9e3707e5b41af8736b24f60eb3c8e [2019-09-10 02:12:39,559 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-10 02:12:39,560 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-10 02:12:39,561 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-10 02:12:39,561 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-10 02:12:39,565 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-10 02:12:39,566 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 02:12:39" (1/1) ... [2019-09-10 02:12:39,569 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@566837db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39, skipping insertion in model container [2019-09-10 02:12:39,569 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 02:12:39" (1/1) ... [2019-09-10 02:12:39,576 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-10 02:12:39,592 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-10 02:12:39,786 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 02:12:39,790 INFO L188 MainTranslator]: Completed pre-run [2019-09-10 02:12:39,810 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 02:12:39,822 INFO L192 MainTranslator]: Completed translation [2019-09-10 02:12:39,823 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39 WrapperNode [2019-09-10 02:12:39,823 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-10 02:12:39,823 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-10 02:12:39,823 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-10 02:12:39,824 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-10 02:12:39,914 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39" (1/1) ... [2019-09-10 02:12:39,914 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39" (1/1) ... [2019-09-10 02:12:39,919 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39" (1/1) ... [2019-09-10 02:12:39,919 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39" (1/1) ... [2019-09-10 02:12:39,922 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39" (1/1) ... [2019-09-10 02:12:39,927 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39" (1/1) ... [2019-09-10 02:12:39,931 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39" (1/1) ... [2019-09-10 02:12:39,932 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-10 02:12:39,932 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-10 02:12:39,932 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-10 02:12:39,933 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-10 02:12:39,933 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39" (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 [2019-09-10 02:12:40,000 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-10 02:12:40,000 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-10 02:12:40,000 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-10 02:12:40,000 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-10 02:12:40,000 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-10 02:12:40,001 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-10 02:12:40,001 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-10 02:12:40,001 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-10 02:12:40,001 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-10 02:12:40,001 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-10 02:12:40,001 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-10 02:12:40,176 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-10 02:12:40,177 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-10 02:12:40,178 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 02:12:40 BoogieIcfgContainer [2019-09-10 02:12:40,178 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-10 02:12:40,179 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-10 02:12:40,179 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-10 02:12:40,182 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-10 02:12:40,182 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.09 02:12:39" (1/3) ... [2019-09-10 02:12:40,183 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7516b5e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 02:12:40, skipping insertion in model container [2019-09-10 02:12:40,183 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:12:39" (2/3) ... [2019-09-10 02:12:40,184 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7516b5e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 02:12:40, skipping insertion in model container [2019-09-10 02:12:40,184 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 02:12:40" (3/3) ... [2019-09-10 02:12:40,185 INFO L109 eAbstractionObserver]: Analyzing ICFG half.i [2019-09-10 02:12:40,196 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-10 02:12:40,204 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-10 02:12:40,222 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-10 02:12:40,267 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-10 02:12:40,268 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-10 02:12:40,268 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-10 02:12:40,268 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-10 02:12:40,268 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-10 02:12:40,270 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-10 02:12:40,270 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-10 02:12:40,271 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-10 02:12:40,291 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-09-10 02:12:40,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-10 02:12:40,303 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:12:40,304 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:12:40,307 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:12:40,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:12:40,314 INFO L82 PathProgramCache]: Analyzing trace with hash -1995182865, now seen corresponding path program 1 times [2019-09-10 02:12:40,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:12:40,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:40,368 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:12:40,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:40,368 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:12:40,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:40,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:40,440 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 02:12:40,440 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-10 02:12:40,441 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:12:40,444 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-10 02:12:40,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-10 02:12:40,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-10 02:12:40,457 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2019-09-10 02:12:40,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:12:40,474 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2019-09-10 02:12:40,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-10 02:12:40,476 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2019-09-10 02:12:40,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:12:40,485 INFO L225 Difference]: With dead ends: 21 [2019-09-10 02:12:40,486 INFO L226 Difference]: Without dead ends: 14 [2019-09-10 02:12:40,488 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-10 02:12:40,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-10 02:12:40,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-10 02:12:40,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-10 02:12:40,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-09-10 02:12:40,523 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2019-09-10 02:12:40,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:12:40,523 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-09-10 02:12:40,523 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-10 02:12:40,524 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-09-10 02:12:40,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-10 02:12:40,524 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:12:40,524 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:12:40,525 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:12:40,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:12:40,525 INFO L82 PathProgramCache]: Analyzing trace with hash -2005341596, now seen corresponding path program 1 times [2019-09-10 02:12:40,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:12:40,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:40,527 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:12:40,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:40,527 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:12:40,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:40,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:40,805 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 02:12:40,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-09-10 02:12:40,806 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:12:40,808 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-10 02:12:40,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-10 02:12:40,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-09-10 02:12:40,809 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 7 states. [2019-09-10 02:12:40,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:12:40,933 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2019-09-10 02:12:40,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-10 02:12:40,934 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2019-09-10 02:12:40,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:12:40,937 INFO L225 Difference]: With dead ends: 24 [2019-09-10 02:12:40,938 INFO L226 Difference]: Without dead ends: 21 [2019-09-10 02:12:40,939 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-09-10 02:12:40,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-09-10 02:12:40,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 15. [2019-09-10 02:12:40,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-10 02:12:40,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-09-10 02:12:40,945 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2019-09-10 02:12:40,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:12:40,945 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-09-10 02:12:40,946 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-10 02:12:40,946 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-09-10 02:12:40,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-10 02:12:40,947 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:12:40,947 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:12:40,947 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:12:40,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:12:40,948 INFO L82 PathProgramCache]: Analyzing trace with hash -763628086, now seen corresponding path program 1 times [2019-09-10 02:12:40,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:12:40,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:40,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:12:40,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:40,950 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:12:40,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:41,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:41,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:41,047 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:12:41,048 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2019-09-10 02:12:41,049 INFO L207 CegarAbsIntRunner]: [0], [4], [8], [14], [16], [19], [23], [30], [33], [35], [41], [42], [43], [45] [2019-09-10 02:12:41,085 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 02:12:41,085 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-10 02:12:41,160 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-10 02:12:41,248 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-10 02:12:41,251 INFO L272 AbstractInterpreter]: Visited 14 different actions 21 times. Merged at 3 different actions 3 times. Never widened. Performed 30 root evaluator evaluations with a maximum evaluation depth of 8. Performed 30 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Found 1 fixpoints after 1 different actions. Largest state had 6 variables. [2019-09-10 02:12:41,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:12:41,256 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-10 02:12:41,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:41,256 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:12:41,273 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:12:41,273 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:12:41,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:41,290 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-10 02:12:41,296 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:12:41,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:41,394 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:12:41,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (2)] Exception during sending of exit command (exit): Broken pipe [2019-09-10 02:12:41,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:12:41,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 5] total 11 [2019-09-10 02:12:41,449 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:12:41,449 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-10 02:12:41,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-10 02:12:41,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2019-09-10 02:12:41,451 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 10 states. [2019-09-10 02:12:41,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:12:41,545 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2019-09-10 02:12:41,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-10 02:12:41,546 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 14 [2019-09-10 02:12:41,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:12:41,547 INFO L225 Difference]: With dead ends: 23 [2019-09-10 02:12:41,547 INFO L226 Difference]: Without dead ends: 23 [2019-09-10 02:12:41,550 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2019-09-10 02:12:41,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-09-10 02:12:41,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 18. [2019-09-10 02:12:41,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-09-10 02:12:41,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-09-10 02:12:41,555 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2019-09-10 02:12:41,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:12:41,572 INFO L475 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-09-10 02:12:41,572 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-10 02:12:41,572 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-09-10 02:12:41,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-09-10 02:12:41,573 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:12:41,573 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:12:41,573 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:12:41,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:12:41,574 INFO L82 PathProgramCache]: Analyzing trace with hash 345235238, now seen corresponding path program 1 times [2019-09-10 02:12:41,574 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:12:41,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:41,575 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:12:41,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:41,576 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:12:41,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:41,858 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:41,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:41,859 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:12:41,859 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2019-09-10 02:12:41,860 INFO L207 CegarAbsIntRunner]: [0], [4], [8], [14], [16], [19], [21], [23], [30], [33], [35], [41], [42], [43], [45] [2019-09-10 02:12:41,862 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 02:12:41,862 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-10 02:12:41,874 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-10 02:12:42,156 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-10 02:12:42,157 INFO L272 AbstractInterpreter]: Visited 15 different actions 73 times. Merged at 5 different actions 28 times. Widened at 1 different actions 4 times. Performed 140 root evaluator evaluations with a maximum evaluation depth of 10. Performed 140 inverse root evaluator evaluations with a maximum inverse evaluation depth of 10. Found 8 fixpoints after 3 different actions. Largest state had 6 variables. [2019-09-10 02:12:42,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:12:42,158 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-10 02:12:42,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:42,159 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:12:42,182 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:12:42,182 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:12:42,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:42,203 INFO L256 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 18 conjunts are in the unsatisfiable core [2019-09-10 02:12:42,206 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:12:42,498 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 02:12:42,563 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:42,563 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:12:42,917 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:42,922 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:12:42,922 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 12] total 26 [2019-09-10 02:12:42,922 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:12:42,923 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-10 02:12:42,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-10 02:12:42,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=536, Unknown=0, NotChecked=0, Total=650 [2019-09-10 02:12:42,924 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 19 states. [2019-09-10 02:12:43,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:12:43,226 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2019-09-10 02:12:43,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-09-10 02:12:43,228 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 17 [2019-09-10 02:12:43,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:12:43,229 INFO L225 Difference]: With dead ends: 34 [2019-09-10 02:12:43,229 INFO L226 Difference]: Without dead ends: 30 [2019-09-10 02:12:43,229 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=158, Invalid=712, Unknown=0, NotChecked=0, Total=870 [2019-09-10 02:12:43,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-09-10 02:12:43,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2019-09-10 02:12:43,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-09-10 02:12:43,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-09-10 02:12:43,240 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 17 [2019-09-10 02:12:43,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:12:43,241 INFO L475 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-09-10 02:12:43,241 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-10 02:12:43,241 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-09-10 02:12:43,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-09-10 02:12:43,242 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:12:43,242 INFO L399 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:12:43,242 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:12:43,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:12:43,243 INFO L82 PathProgramCache]: Analyzing trace with hash 423463818, now seen corresponding path program 2 times [2019-09-10 02:12:43,243 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:12:43,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:43,246 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:12:43,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:43,246 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:12:43,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:43,418 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:43,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:43,418 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:12:43,419 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:12:43,419 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:12:43,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:43,419 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-10 02:12:43,444 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:12:43,444 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:12:43,465 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-09-10 02:12:43,465 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:12:43,466 INFO L256 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 12 conjunts are in the unsatisfiable core [2019-09-10 02:12:43,468 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:12:43,584 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 23 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-09-10 02:12:43,584 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:12:43,682 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 02:12:43,683 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 02:12:43,710 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-09-10 02:12:43,714 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:12:43,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 17 [2019-09-10 02:12:43,714 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:12:43,715 INFO L454 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-09-10 02:12:43,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-09-10 02:12:43,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2019-09-10 02:12:43,716 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 14 states. [2019-09-10 02:12:43,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:12:43,962 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2019-09-10 02:12:43,963 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-10 02:12:43,963 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2019-09-10 02:12:43,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:12:43,964 INFO L225 Difference]: With dead ends: 31 [2019-09-10 02:12:43,964 INFO L226 Difference]: Without dead ends: 31 [2019-09-10 02:12:43,965 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=132, Invalid=420, Unknown=0, NotChecked=0, Total=552 [2019-09-10 02:12:43,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-09-10 02:12:43,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2019-09-10 02:12:43,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-09-10 02:12:43,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2019-09-10 02:12:43,969 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2019-09-10 02:12:43,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:12:43,969 INFO L475 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2019-09-10 02:12:43,969 INFO L476 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-09-10 02:12:43,969 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2019-09-10 02:12:43,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-09-10 02:12:43,970 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:12:43,970 INFO L399 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:12:43,971 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:12:43,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:12:43,971 INFO L82 PathProgramCache]: Analyzing trace with hash 45653034, now seen corresponding path program 3 times [2019-09-10 02:12:43,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:12:43,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:43,972 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:12:43,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:43,973 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:12:43,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:44,268 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-09-10 02:12:44,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:44,269 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:12:44,269 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:12:44,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:12:44,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:44,269 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-10 02:12:44,294 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:12:44,294 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:12:44,317 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:12:44,317 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:12:44,318 INFO L256 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 30 conjunts are in the unsatisfiable core [2019-09-10 02:12:44,321 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:12:44,617 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 02:12:44,670 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:44,671 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:12:45,359 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:45,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:12:45,367 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 17] total 39 [2019-09-10 02:12:45,367 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:12:45,367 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-09-10 02:12:45,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-09-10 02:12:45,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1248, Unknown=0, NotChecked=0, Total=1482 [2019-09-10 02:12:45,370 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 27 states. [2019-09-10 02:12:45,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:12:45,983 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2019-09-10 02:12:45,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-09-10 02:12:45,983 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 29 [2019-09-10 02:12:45,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:12:45,984 INFO L225 Difference]: With dead ends: 36 [2019-09-10 02:12:45,984 INFO L226 Difference]: Without dead ends: 0 [2019-09-10 02:12:45,985 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 785 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=405, Invalid=2045, Unknown=0, NotChecked=0, Total=2450 [2019-09-10 02:12:45,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-10 02:12:45,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-10 02:12:45,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-10 02:12:45,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-10 02:12:45,986 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2019-09-10 02:12:45,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:12:45,987 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-10 02:12:45,987 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-09-10 02:12:45,987 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-10 02:12:45,987 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-10 02:12:45,992 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.09 02:12:45 BoogieIcfgContainer [2019-09-10 02:12:45,992 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-10 02:12:45,995 INFO L168 Benchmark]: Toolchain (without parser) took 6433.64 ms. Allocated memory was 134.2 MB in the beginning and 304.6 MB in the end (delta: 170.4 MB). Free memory was 90.3 MB in the beginning and 137.4 MB in the end (delta: -47.1 MB). Peak memory consumption was 123.3 MB. Max. memory is 7.1 GB. [2019-09-10 02:12:45,996 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 134.2 MB. Free memory was 108.8 MB in the beginning and 108.6 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-10 02:12:45,997 INFO L168 Benchmark]: CACSL2BoogieTranslator took 261.74 ms. Allocated memory is still 134.2 MB. Free memory was 90.1 MB in the beginning and 80.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2019-09-10 02:12:45,998 INFO L168 Benchmark]: Boogie Preprocessor took 108.65 ms. Allocated memory was 134.2 MB in the beginning and 200.3 MB in the end (delta: 66.1 MB). Free memory was 80.8 MB in the beginning and 176.9 MB in the end (delta: -96.1 MB). Peak memory consumption was 16.0 MB. Max. memory is 7.1 GB. [2019-09-10 02:12:45,999 INFO L168 Benchmark]: RCFGBuilder took 245.88 ms. Allocated memory is still 200.3 MB. Free memory was 176.9 MB in the beginning and 165.1 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. [2019-09-10 02:12:46,000 INFO L168 Benchmark]: TraceAbstraction took 5813.36 ms. Allocated memory was 200.3 MB in the beginning and 304.6 MB in the end (delta: 104.3 MB). Free memory was 164.5 MB in the beginning and 137.4 MB in the end (delta: 27.1 MB). Peak memory consumption was 131.4 MB. Max. memory is 7.1 GB. [2019-09-10 02:12:46,004 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 134.2 MB. Free memory was 108.8 MB in the beginning and 108.6 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 261.74 ms. Allocated memory is still 134.2 MB. Free memory was 90.1 MB in the beginning and 80.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 108.65 ms. Allocated memory was 134.2 MB in the beginning and 200.3 MB in the end (delta: 66.1 MB). Free memory was 80.8 MB in the beginning and 176.9 MB in the end (delta: -96.1 MB). Peak memory consumption was 16.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 245.88 ms. Allocated memory is still 200.3 MB. Free memory was 176.9 MB in the beginning and 165.1 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5813.36 ms. Allocated memory was 200.3 MB in the beginning and 304.6 MB in the end (delta: 104.3 MB). Free memory was 164.5 MB in the beginning and 137.4 MB in the end (delta: 27.1 MB). Peak memory consumption was 131.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. SAFE Result, 5.7s OverallTime, 6 OverallIterations, 6 TraceHistogramMax, 1.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 68 SDtfs, 79 SDslu, 314 SDs, 0 SdLazy, 705 SolverSat, 62 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 247 GetRequests, 117 SyntacticMatches, 15 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1104 ImplicationChecksByTransitivity, 3.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.5s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 15 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.1s InterpolantComputationTime, 194 NumberOfCodeBlocks, 191 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 266 ConstructedInterpolants, 0 QuantifiedInterpolants, 72488 SizeOfPredicates, 14 NumberOfNonLiveVariables, 204 ConjunctsInSsa, 69 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 64/276 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...